OFFSHORE SERVICE SPECIFICATION
DNV-OSS-301
Verification and Certification of
Submarine Pipelines
JANUARY 2014
The electronic pdf version of this document found through http://www.dnv.com is the officially binding version
DET NORSKE VERITAS AS
FOREWORD
DNV is a global provider of knowledge for managing risk. Today, safe and responsible business conduct is both a license
to operate and a competitive advantage. Our core competence is to identify, assess, and advise on risk management. From
our leading position in certification, classification, verification, and training, we develop and apply standards and best
practices. This helps our customers safely and responsibly improve their business performance. DNV is an independent
organisation with dedicated risk professionals in more than 100 countries, with the purpose of safeguarding life, property
and the environment.
DNV service documents consist of among others the following types of documents:
— Service Specifications. Procedural requirements.
— Standards. Technical requirements.
— Recommended Practices. Guidance.
The Standards and Recommended Practices are offered within the following areas:
A) Qualification, Quality and Safety Methodology
B) Materials Technology
C) Structures
D) Systems
E) Special Facilities
F) Pipelines and Risers
G) Asset Operation
H) Marine Operations
J) Cleaner Energy
O) Subsea Systems
U) Unconventional Oil & Gas
© Det Norske Veritas AS January 2014
Any comments may be sent by e-mail to [email protected]
This service document has been prepared based on available knowledge, technology and/or information at the time of issuance of this document, and is believed to reflect the best of
contemporary technology. The use of this document by others than DNV is at the user's sole risk. DNV does not accept any liability or responsibility for loss or damages resulting from
any use of this document.
Offshore Service Specification DNV-OSS-301, January 2014
CHANGES – CURRENT – Page 3
CHANGES – CURRENT
General
This document supersedes DNV-OSS-301, October 2000.
Text affected by the main changes in this edition is highlighted in red colour. However, if the changes involve
a whole chapter, section or sub-section, normally only the title will be in red colour.
Det Norske Veritas AS, company registration number 945 748 931, has on 27th November 2013 changed its
name to DNV GL AS. For further information, see www.dnvgl.com. Any reference in this document to
“Det Norske Veritas AS” or “DNV” shall therefore also be a reference to “DNV GL AS”.
Main changes January 2014
• General
This document has been totally revised with focus on scope for verification and requirements for certification
during fabrication and operation. In addition the following have been done:
— Alignment with DNV-OSS-300 and last edition of DNV-OS-F101.
— Implementation of “Code Manager” for experience recording and future updates.
Editorial corrections
In addition to the above stated main changes, editorial corrections may have been made.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Contents – Page 4
CONTENTS
CHANGES – CURRENT ................................................................................................................... 3
1
Introduction ............................................................................................................................... 6
1.1
1.2
1.3
2
Principles of Risk-Differentiated verification ....................................................................... 10
2.1
2.2
2.3
2.4
2.5
3
General.......................................................................................................................................................... 10
2.1.1 Objectives......................................................................................................................................... 10
Verification principles ................................................................................................................................. 10
2.2.1 Purpose of verification ..................................................................................................................... 10
2.2.2 Verification as a complementary activity ........................................................................................ 10
2.2.3 Verification management ................................................................................................................. 10
2.2.4 Risk-differentiated levels of verification involvement .................................................................... 10
Selection of level of verification involvement ............................................................................................ 12
2.3.1 Selection factors ............................................................................................................................... 12
2.3.2 Overall safety objective.................................................................................................................... 12
2.3.3 Risk assessment................................................................................................................................ 12
2.3.4 Technical innovation and contractor experience.............................................................................. 13
2.3.5 Quality management systems........................................................................................................... 13
Defining a verification plan / scope of work .............................................................................................. 13
2.4.1 Risk based verification planning ...................................................................................................... 13
Information flow .......................................................................................................................................... 14
2.5.1 Communication lines ....................................................................................................................... 14
2.5.2 Obligations ....................................................................................................................................... 14
2.5.3 Notification of level of verification involvement............................................................................. 15
Verification activities .............................................................................................................. 16
3.1
3.2
3.3
3.4
3.5
4
General............................................................................................................................................................ 6
1.1.1 Introduction ........................................................................................................................................ 6
1.1.2 Objectives........................................................................................................................................... 6
1.1.3 Verification service ........................................................................................................................... 6
1.1.4 Certification service .......................................................................................................................... 6
1.1.5 Structure of this document ................................................................................................................. 7
Definitions....................................................................................................................................................... 7
1.2.1 General ............................................................................................................................................... 7
1.2.2 Verbal forms....................................................................................................................................... 7
1.2.3 Definitions.......................................................................................................................................... 7
References....................................................................................................................................................... 9
General.......................................................................................................................................................... 16
3.1.1 Objectives......................................................................................................................................... 16
3.1.2 Scope of work .................................................................................................................................. 16
Project phases............................................................................................................................................... 16
3.2.1 General principles ............................................................................................................................ 16
Project initiation .......................................................................................................................................... 16
3.3.1 Verification during conceptual design ............................................................................................. 16
Project realisation ........................................................................................................................................ 17
3.4.1 General ............................................................................................................................................. 17
3.4.2 Verification of overall project management .................................................................................... 17
3.4.3 Verification during design................................................................................................................ 17
3.4.4 Verification during construction ...................................................................................................... 18
Operation...................................................................................................................................................... 21
3.5.1 Verification during operation ........................................................................................................... 21
Verification service requirements .......................................................................................... 23
4.1
4.2
General.......................................................................................................................................................... 23
4.1.1 Objectives......................................................................................................................................... 23
4.1.2 Scope of work .................................................................................................................................. 23
Verification service documents................................................................................................................... 23
4.2.1 General ............................................................................................................................................. 23
4.2.2 Statement of conformity................................................................................................................... 23
4.2.3 Verification report ............................................................................................................................ 24
4.2.4 Intermediate documents ................................................................................................................... 24
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Contents – Page 5
5
Certification service requirements......................................................................................... 25
5.1
5.2
5.3
App. A
General.......................................................................................................................................................... 25
5.1.1 Objectives......................................................................................................................................... 25
5.1.2 Scope of work .................................................................................................................................. 25
Certification service documents ................................................................................................................. 25
5.2.1 General ............................................................................................................................................. 25
5.2.2 Certificate of conformity.................................................................................................................. 26
5.2.3 Statement of conformity................................................................................................................... 27
5.2.4 Verification report ............................................................................................................................ 27
5.2.5 Intermediate documents ................................................................................................................... 27
Retention of pipeline certificate.................................................................................................................. 27
5.3.1 General ............................................................................................................................................. 27
5.3.2 Certificate of conformity with maintenance conditions................................................................... 27
5.3.3 Requirements for pipeline certificate retention................................................................................ 28
Guideline on selection of verification involvement level based on simplified
verification planning...................................................................................................... 29
A.1
A.2
App. B
Generic description of project sub-phases................................................................... 31
B.1
B.2
B.3
B.4
App. C
General ............................................................................................................................................
Initial studies ...................................................................................................................................
Design .............................................................................................................................................
Other phases ....................................................................................................................................
31
31
31
32
Examples of verification and certification documents ............................................... 33
C.1
App. D
General ............................................................................................................................................ 29
Trigger Questions............................................................................................................................ 29
General ............................................................................................................................................ 33
Detailed scope of work tables for verification and certification ................................ 40
D.1
D.2
D.3
D.4
D.5
D.6
General ............................................................................................................................................
Description of terms used in the scope of work tables....................................................................
Overall project management ...........................................................................................................
Design .............................................................................................................................................
Construction ....................................................................................................................................
Operation.........................................................................................................................................
40
40
41
42
47
63
CHANGES – HISTORIC ................................................................................................................. 67
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.1 Introduction – Page 6
SECTION 1 INTRODUCTION
1.1 General
1.1.1 Introduction
1.1.1.1 This DNV Offshore Service Specification (DNV-OSS-301) describes the DNV verification service for
submarine pipelines and defines the additional requirements for obtaining and retaining a DNV pipeline system
Certificate of Conformity.
1.1.1.2 This OSS falls under the top level document DNV-OSS-300 Risk Based Verification and applies riskdifferentiated levels of verification involvement.
1.1.1.3 This OSS identifies and describes verification activities for a pipeline system during design,
construction and operation.
1.1.1.4 This OSS is tailor-made for verification and certification of pipeline systems designed and constructed
in accordance with DNV-OS-F101.
1.1.1.5 The identified and described verification activities in this OSS are generic. Based on the scope of work
tables in Sec.3, the detailed verification scope of work tables in App.D should be subject to project specific
tailoring based on risk assessments.
1.1.2 Objectives
1.1.2.1 The objectives of this document are to:
—
—
—
—
—
describe DNV’s verification and certification services for submarine pipeline systems
describe DNV’s approach to risk differentiated levels of verification involvement
provide guidance for the selection of the level of DNV verification involvement
provide guidance on how to establish a verification plan
provide a common communication platform for describing the extent of verification activities required for
DNV certification of submarine pipelines.
1.1.3 Verification service
1.1.3.1 The objective for the verification service is generally the verification of the pipeline integrity. Other
aspects, such as the verification of the environmental impact of the pipeline system, or its suitability with
respect to flow capacity and flow assurance, may be included in DNV’s scope of work, if desired by the
customer.
1.1.3.2 The verification service is described in Sec.4. Scope of work definition based on risk-differentiated
level of verification involvement is described in Sec.2. Sec.3 describes different project phases and gives
generic scope of work tables.
1.1.3.3 For verification services the customer may stipulate the verification scope of work and the level of
verification involvement to be applied. The selection of the level of verification involvement should be based
on a risk assessment. The verification scope of work may impact the type of DNV deliverables.
1.1.3.4 For verification services this OSS may be adopted for the verification of parts of a pipeline system and/
or selected project phases.
1.1.3.5 For verification to other technical standards than DNV-OS-F101 or to customer’s specifications, this
OSS may still be used as a communication platform and as a starting point for preparation of project specific
scope of work tables.
1.1.4 Certification service
1.1.4.1 The objective for the certification service is the verification of the pipeline integrity.
1.1.4.2 For certification services this OSS identifies and describes the verification activities required to obtain
a DNV pipeline system Certificate of Conformity and how to retain the certificate during operation if the scope
of work covers a certificate with maintenance conditions.
1.1.4.3 For certification services the verification scope of work is defined in Sec.5. DNV shall independently
of the customer stipulate the level of verification involvement to be applied.
1.1.4.4 The certification service is based on the principles described in Sec.2. The project specific verification
plan requested in [2.4] shall be developed based on the generic scope of work in Sec.3 and in accordance with
the requirements in Sec.5.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.1 Introduction – Page 7
1.1.4.5 Statutory certification of pipeline systems to the requirements of national authorities is not included
specifically in the scope of application of this OSS. Such certification shall be governed by the regulations of
the national authorities. However, if detailed procedures are not given by these authorities, this OSS shall be
used by DNV as a guideline for DNV’s work.
Guidance note:
The certificate issued shall state that it is issued under authorisation of the relevant authorities, including reference to
the relevant certification scheme.
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1.1.5 Structure of this document
1.1.5.1 This document consist of five sections and four appendices:
Sec.1
Sec.2
Sec.3
Sec.4
Sec.5
App.A
App.B
App.C
App.D
gives the general scope of the document, definitions and references.
describes the principles of verification based on risk differentiated levels of verification involvement,
how to define the level of verification involvement, and how to develop a verification plan/scope of
work for a particular project.
describes generic verification activities for each of the project phases.
describes the verification service; scope of work definition and documents issued by DNV as a result
of the verification service process.
describes the certification service; requirements for obtaining and retaining a DNV pipeline system
Certificate of Conformity, and documents issued by DNV as a result of the certification service
process.
poses trigger questions for the selection of level of verification involvement.
contains generic descriptions of project sub-phases.
gives examples of DNV verification and certification service documents.
gives detailed scope of work tables for all project phases and all levels of verification involvement.
These tables are generic and the basis for the development of project specific scope of work tables.
1.2 Definitions
1.2.1 General
1.2.1.1 The definitions in DNV-OS-F101 Sec.1 C200 also apply to this OSS.
1.2.1.2 The most important definitions from DNV-OS-F101 applied in this OSS are repeated. They are marked
“(DNV-OS-F101)” between the word and its definition, ref. e.g. verification.
1.2.2 Verbal forms
1.2.2.1 Shall: verbal form used to indicate requirements strictly to be followed in order to conform to the
document.
1.2.2.2 Should: verbal form used to indicate that among several possibilities one is recommended as
particularly suitable, without mentioning or excluding others, or that a certain course of action is preferred but
not necessarily required.
1.2.2.3 May: verbal form used to indicate a course of action permissible within the limits of the document.
1.2.3 Definitions
1.2.3.1 Certification: (ISO 17000:2004): Third-party issue of a statement, based on a decision following
review, that fulfilment of specified requirements has been demonstrated related to products, processes or
systems. Review shall in this context mean verification of the suitability, adequacy and effectiveness of
selection and determination activities, and the results of these activities, with regard to fulfilment of specified
requirements by an object of conformity assessment.
1.2.3.2 Certification service: The process of performing certification. The certification service includes the
issuing of a DNV Certificate. The certification service requires a service specification as reference.
Guidance note:
A certification service may be regarded as a verification process which fulfils certain formal requirements. The scope
of work is normally standardized and shall be pre-defined in the form of a publicly available service description, either
a DNV service specification or a nationally or internationally recognized standard which stipulates certification
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.1 Introduction – Page 8
requirements. The final deliverable DNV document shall be a certificate. The type of certificate that may be issued
depends on the nature of the certification scope of work.
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1.2.3.3 Commissioning (DNV-OS-F101): Activities associated with the initial filling of the pipeline system
with the fluid to be transported, part of operational phase.
1.2.3.4 Commissioning, Pre- (DNV-OS-F101): Activities after tie-in/connection and prior to commissioning
including system pressure-testing, dewatering, cleaning and drying.
1.2.3.5 Construction phase (DNV-OS-F101): The construction phase will typically include manufacture,
fabrication and installation activities. Manufacture activities will typically include manufacture of linepipe and
corrosion protection and weight coating. Fabrication activities will typically include fabrication of pipeline
components and assemblies. Installation activities will typically include pre- and post-intervention work,
transportation, installation, tie-in and pre-commissioning.
1.2.3.6 Customer: DNV’s contractual partner. It may be the purchaser, the operator, the owner or a contractor.
1.2.3.7 Design (DNV-OS-F101): All related engineering to design the pipeline including both structural as
well as material and corrosion.
1.2.3.8 Fabrication (DNV-OS-F101): Activities related to the assembly of objects with a defined purpose in
a pipeline system.
1.2.3.9 Hazard: A deviation (departure from the design and operating intention) which could cause damage,
injury or other form of loss (Chemical Industries Association HAZOP Guide).
1.2.3.10 HAZOP (HAZard and OPerability study): The application of a formal systematic critical examination
to the process and engineering intentions of new or existing facilities to assess the hazard potential of maloperation or mal-function of individual items of equipment and their consequential effects on the facility as a
whole (Chemical Industries Association HAZOP Guide).
1.2.3.11 Installation (activity) (DNV-OS-F101): The operations related to installing the equipment, pipeline
or structure, e.g. pipeline laying, tie-in, piling of structure etc.
1.2.3.12 Manufacture (DNV-OS-F101): Making of articles or materials, often in large volumes. In relation to
pipelines, refers to activities for the production of linepipe, anodes and other components and application of
coating, performed under contracts from one or more contractors.
1.2.3.13 Operations (phase): The phase when the pipeline is being used for the purpose for which it was
designed.
1.2.3.14 Pipeline integrity (DNV-OS-F101): Pipeline integrity is the ability of the submarine pipeline system
to operate safely and withstand the loads imposed during the lifetime cycle.
1.2.3.15 Risk (DNV-OS-F101): The qualitative or quantitative likelihood of an accident or unplanned event
occurring, considered in conjunction with the potential consequences of such a failure. In quantitative terms,
risk is the quantified probability of a defined failure mode times its quantified consequence.
1.2.3.16 Risk Reduction Measures: Those measures taken to reduce the risks to the operation of the pipeline
system and to the health and safety of personnel associated with it or in its vicinity by:
— reduction in the probability of failure
— mitigation of the consequences of failure.
Guidance note:
The usual order of preference of risk reduction measures is:
1) Inherent safety
2) Prevention
3) Detection
4) Control
5) Mitigation
6) Emergency response.
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1.2.3.17 Safety Objectives (ref. DNV-OS-F101 Sec.2 B200): The safety goals for the construction, operation
and decommissioning of the pipeline including acceptance criteria for the level of risk acceptable to the owner.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.1 Introduction – Page 9
1.2.3.18 Verification (ISO 9000:2005): Confirmation, through the provision of objective evidence, that
specified requirements have been fulfilled.
Guidance note:
The term “verified” is used to designate the corresponding status. Verification can comprise activities such as:
— performing alternative or additional calculations
— comparing a new design specification with a similar proven design specification
— undertaking validation tests
— reviewing documents.
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1.2.3.19 Verification service: The verification service includes, in addition to performing verification, the
issuing of a deliverable DNV document in which the conclusion of the verification activity is stated.
Guidance note:
The scope of work shall be agreed, and described in a contract, between DNV and the customer. The scope of work
may be described by reference to an object specific DNV service specification or technical standards specified by
customer. In the case of an object specific DNV service specification forming the basis for verification scope
definition, any deviation or amendment to the scope of work outlined in the DNV service specification shall be
addressed in the contract. The deliverables shall be agreed in the contract. The type of DNV document(s) that may be
issued depends on the extent and nature of the verification scope of work.
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1.3 References
DNV-OS-F101
DNV-OSS-300
DNV-RP-F105
DNV-RP-F109
DNV-RP-F110
Submarine Pipeline Systems, 2012, Det Norske Veritas, Høvik.
Risk Based Verification, 2012, Det Norske Veritas, Høvik.
Free Spanning Pipelines, 2006, Det Norske Veritas, Høvik.
On-Bottom Stability Design of Submarine Pipelines, 2011, Det Norske Veritas, Høvik.
Global Buckling of Submarine Pipelines due to High Temperature/High Pressure, 2007,
Det Norske Veritas, Høvik.
DNV-RP-F111
Interference Between Trawl Gear and Pipelines, 2010, Det Norske Veritas, Høvik.
DNV-RP-F116
Integrity Management of Submarine Pipeline Systems, 2009, Det Norske Veritas,
Høvik.
Chemical Industries A Guide to Hazard and Operability Studies, 1979.
Association Limited,
London
ISO 9000:2005
Quality management systems – Fundamentals and vocabulary, International
Organization for Standardization, Geneva.
ISO 9001:2008
Quality management systems – Requirements, International Organization for
Standardization, Geneva.
ISO 17000:2004
Conformity Assessment—Vocabulary and general principles, International
Organization for Standardization, Geneva.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.2 Principles of Risk-Differentiated verification – Page 10
SECTION 2 PRINCIPLES OF RISK-DIFFERENTIATED VERIFICATION
2.1 General
2.1.1 Objectives
2.1.1.1 The objectives of this section are to provide:
—
—
—
—
—
introduction to the principles of verification of submarine pipeline systems
introduction to the principles of risk differentiated levels of verification involvement
guidance on the selection of levels of verification involvement
information on how to develop a verification plan
information on involved parties, communication and obligations.
2.2 Verification principles
2.2.1 Purpose of verification
2.2.1.1 Verification constitutes a systematic and independent examination of the various phases in the lifecycle
of a pipeline system to determine whether it fulfils the specified requirements.
2.2.1.2 Verification activities are expected to identify errors or failures in the work associated with the pipeline
system and to contribute to reducing the risks to the operation of the pipeline system and to the health and safety
of personnel associated with it or in its vicinity.
2.2.1.3 Verification is primarily focused on pipeline integrity, but business risk (e.g. cost and schedule) may
also be addressed.
2.2.2 Verification as a complementary activity
2.2.2.1 Verification shall be complementary to routine design, construction and operations activities and not a
substitute. Therefore, although verification will take into account the work, and the quality assurance and
quality control of that work, carried out by the owner and his contractors, it is inevitable that verification will
duplicate some work that has been carried out previously by other parties involved in the pipeline project.
2.2.3 Verification management
2.2.3.1 The verification philosophy and verification methods used shall be described to ensure satisfactory
completion of the verification activities.
2.2.3.2 The philosophy and the methods shall ensure that the verification:
— has a consistent and constructive approach to the satisfactory completion and operation of the pipeline
system
— is available world-wide wherever the owner or his contractors operate
— applies up-to-date methods, tools and procedures
— employs qualified and experienced personnel.
2.2.3.3 All verification activities shall be carried out by competent personnel. Competence includes having the
necessary theoretical and practical knowledge and experience of the activity being examined. An adequate
verification of some activities may require access to specialised technical knowledge.
2.2.3.4 As well as demonstrating competence of individuals, the verification organisation shall be able to show
competence and experience in pipeline verification work.
2.2.4 Risk-differentiated levels of verification involvement
2.2.4.1 The approach of risk-differentiated levels of verification involvement shall be applied to the definition
of verification plan/scope of work, as outlined in the general risk based verification service overview in DNVOSS-300.
2.2.4.2 The level of verification involvement is differentiated according to the risk associated with the
pipeline. If the risk associated with the pipeline is higher, the level of verification involvement is higher.
Conversely, if the risk associated with the pipeline is lower, the level of verification involvement can be
reduced, without reducing the verification effectiveness.
2.2.4.3 The verification involvement is categorised into low, medium and high. A summary of the levels of
involvement is given in Table 2-1. This table covers verification during the project phase, for verification
during operation of a pipeline the verification involvement should be categorised into levels based on the same
principles.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.2 Principles of Risk-Differentiated verification – Page 11
Medium is the customary level of verification involvement and is applied to the majority of pipelines.
High
is the level of verification involvement applied where the risks associated with the pipeline are
higher because, for example, it has highly corrosive contents, it is in adverse environmental
conditions, it is technically innovative or the contractors are not well experienced in the design and
construction of similar pipelines.
Low
is the level of verification involvement applied where the risks associated with the pipeline are lower
because, for example, it has benign contents, it is located in congenial environmental conditions, or
the contractors are well experienced in the design and construction of similar pipelines.
Table 2-1 Summary of verification involvement and guidance for their applicability – project phase
Level
Description of verification involvement
Low
—
—
—
—
Medium
—
—
—
High
—
—
—
—
—
—
Guidance for typical application for each level of
involvement
— Proven pipeline designs with benign contents
Review of general principles and production
and/or installed in benign environmental
systems during design and construction.
conditions.
Review of principal design documents,
— Straightforward pipelines designed and
construction procedures and qualification (e.g.
constructed by experienced contractors.
MPQT) reports.
Visit-based attendance during system testing and — Low consequences of failure from a safety,
environmental or commercial point of view.
start-up activities.
— Relaxed to normal completion schedule.
Less comprehensive involvement than level
Medium.
— Pipelines in moderate environmental conditions.
Review of general principles and production
— Projects with a moderate degree of novelty.
systems during design and construction.
Detailed review of principal and other selected — Medium consequences of failure from a safety,
environmental or commercial point of view.
design documents with support of simplified
— Ordinary completion schedule.
independent analyses.
Full time attendance during (procedure)
qualification (e.g. MPQT) and review of the
resulting reports.
Visit-based or intermittent presence at site.
Review of general principles and production
— Projects with a high degree of novelty or large
systems during design and construction.
leaps in technology.
Detailed review of most design documents with — Pipelines in extreme environmental conditions.
support of simplified and advanced independent — Inexperienced contractors or exceptionally tight
analyses.
completion schedule.
Full time attendance during (procedure)
— Very high consequences of failure from a safety,
qualification (e.g. MPQT) and review of the
environmental or commercial point of view.
resulting reports.
Full time presence at site for most activities.
More comprehensive involvement than level
Medium.
2.2.4.4 The selection of level of verification involvement shall be based on a risk based verification planning
process.
2.2.4.5 The basis for the selection of level of verification involvement shall be documented.
2.2.4.6 Different levels of verification involvement can be chosen for different phases of the pipeline system,
or even parts of the pipeline system within the same phase.
Guidance note:
For example, pipeline design may be innovative and considered high risk whereas the installation method is well
known and considered low risk. The converse might also be the case.
Additionally, linepipe production from a well-known mill may be considered low risk, whereas, production from an
unknown mill may be considered high risk.
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2.2.4.7 The level of verification involvement can be reduced or increased during a phase if the originally
chosen level is considered too rigorous or too lenient, as new information on the risks associated with the
pipeline system becomes available.
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Offshore Service Specification DNV-OSS-301, January 2014
Sec.2 Principles of Risk-Differentiated verification – Page 12
2.3 Selection of level of verification involvement
2.3.1 Selection factors
2.3.1.1 The selection of the level of verification involvement shall depend on the criticality of each of the
elements that have an impact on the management of hazards and associated risk levels of the pipeline system.
This is illustrated by Figure 2-1.
The contribution of each element shall be judged qualitatively and/or quantitatively and shall use, where
possible, quantified risk assessment data to provide a justifiable basis for any decisions made.
Appendix A gives a guideline on selection of level of verification involvement based on a simplified risk
assessment.
2.3.1.2 Selection factors are the:
—
—
—
—
—
overall safety objectives for the pipeline system
assessment of the risks associated with the pipeline and the measures taken to reduce these risks
degree of technical innovation in the pipeline system
experience of the contractors in carrying out similar work
quality management systems of the owner and his contractors.
Guidance note:
These factors are addressed in DNV-OS-F101 Sec.2 B.
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Figure 2-1
Selection of the level of verification involvement based on risk assessment
2.3.2 Overall safety objective
2.3.2.1 An overall safety objective covering all phases of the pipeline system from design to operation should
be defined by the customer. The safety objective should address the main safety goals as well as establishing
acceptance criteria for the level of risk acceptable to the owner. Depending on the pipeline and its location the
risk could be measured in terms of human injuries as well as environmental, political and economic
consequences.
2.3.3 Risk assessment
2.3.3.1 A systematic review, i.e. a detailed analytical risk assessment, a simplified risk assessment based on
trigger questions (ref. App.A), or a combination thereof; shall be carried out to identify and evaluate the
probabilities and consequences of failures in the pipeline system. The extent of the review shall reflect the
criticality of the pipeline system, the planned operation and previous experience with similar pipeline systems.
This review shall identify the risks associated with the operation of the pipeline system and to the health and
safety of personnel associated with it or in its vicinity.
2.3.3.2 Once the risks have been identified their extent can be reduced to a level as low as reasonably
practicable by means of one or both of:
— reduction in the probability of failure
— mitigation of the consequences of failure.
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Offshore Service Specification DNV-OSS-301, January 2014
Sec.2 Principles of Risk-Differentiated verification – Page 13
Guidance note:
The term “as low as reasonably practicable (ALARP)” has come into use through the United Kingdom’s “The Health
and Safety at Work etc. Act 1974”. Reasonable Practicability is not defined in the Act but has acquired meaning by
interpretations in the courts.
It has been interpreted to mean that the degree of risk from any particular activity can be balanced against the cost,
time and trouble of the measures to be taken to reduce the risk.
It follows, therefore, that the greater the risk the more reasonable it would be to incur substantial cost, time and effort
in reducing that risk. Similarly, if the risk was very small it would not be reasonable to expect great expense or effort
to be incurred in reducing it.
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2.3.3.3 The result of the systematic review of these risks is measured against the safety objectives and used in
the selection of the appropriate verification involvement level.
2.3.4 Technical innovation and contractor experience
2.3.4.1 The degree of technical innovation in the pipeline system shall be considered. Risks to the pipeline are
likely to be greater for a pipeline with a high degree of technical innovation than with a pipeline designed,
manufactured and installed to well-known criteria in well-known waters.
2.3.4.2 Similarly, the degree of risk associated with the pipeline system should be considered where
contractors are inexperienced or the work schedule is tight.
2.3.4.3 Factors to be considered in the selection of the appropriate verification involvement level include:
—
—
—
—
degree of difficulty in achieving technical requirements
knowledge of similar pipelines
knowledge of contractors’ general pipeline experience
knowledge of contractors’ experience in similar work.
2.3.5 Quality management systems
2.3.5.1 Adequate quality management systems shall be implemented to ensure that gross errors in the work for
pipeline system design, construction and operations are limited. The adequacy of the quality management
system should influence the selection of the level of verification involvement.
2.3.5.2 Factors to be considered when evaluating the adequacy of the quality management system include:
—
—
—
—
—
whether or not an ISO 9001 or equivalent certified system is in place
results from external audits
results from internal audits
experience with contractors’ previous work
project work-force familiarity with the quality management system, e.g. has there been a rapid expansion
of the work force or are all parties of a joint venture familiar with the same system.
Guidance note:
Most organisations have quality management systems certified by an accredited certification body. However, when
business increases, they expand their staff quickly by taking on contract personnel often for a fixed period or for the
duration of a particular contract.
This influx of new personnel can lead to problems of control of both the whole organisation and of particular projects
being undertaken. Quality problems may then occur, as these new personnel have no detailed knowledge of the
organisation’s business methods, its ethos or its working procedures. New organisations may experience quality
problems for similar reasons.
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2.4 Defining a verification plan / scope of work
2.4.1 Risk based verification planning
2.4.1.1 Based on the pipeline system specifications, the risk assessment and the selection of level of
verification involvement, a verification plan shall be developed.
2.4.1.2 The verification plan is the scope of work for DNV’s verification. It should be re-visited, re-evaluated
and revised if required as the project progresses and new information becomes available.
2.4.1.3 Generic scopes of work for verification at the three levels of verification involvement, Low (L),
Medium (M) and High (H), are given in the tables in Sec.3.
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Sec.2 Principles of Risk-Differentiated verification – Page 14
2.4.1.4 Typical detailed scope of work descriptions, which are based on the generic scopes of work and which
show the activities to be verified, are given in App.D.
2.4.1.5 A specific scope of work description shall be made for each particular project, and shall be included in
the final DNV verification report.
2.5 Information flow
2.5.1 Communication lines
2.5.1.1 Communication lines are illustrated in Figure 2-2. Which lines that are open for communication
depends on the particular contractual agreements.
2.5.1.2 Where DNV’s customer is the designer/constructor and not of the owner (operator) of the pipeline
system, DNV strongly recommends that the owner secures a direct communication line from DNV to owner
and vice versa.
Guidance note:
The recommendation stems from DNV’s experience with projects where communications difficulties between the
parties have jeopardised the issue of the pipeline verification statement.
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Owner/
operator
Designer/
constructor
DNV
Figure 2-2
Communication Lines
2.5.2 Obligations
2.5.2.1 In order to achieve the purpose and benefits of verification the involved parties shall be mutually
obliged to share and act upon all relevant information pertaining to the verification involvement.
2.5.2.2 The customer shall be obliged to:
— Give DNV full access in due time to all information concerning the verification scope for the pipeline
system and ensure that clauses to this effect are included in contracts for parties acting on behalf of the
owner and parties providing products, processes and services covered by the verification scope.
— Ensure that DNV is involved in the handling of deviations from specified requirements within the
verification scope.
— Act upon information provided by DNV with respect to events or circumstances that may jeopardise the
pipeline system and/or the purpose and benefit of verification.
— Ensure that the safety and integrity objectives established for the pipeline project are known and pursued
by parties acting on behalf of the customer and parties providing products, processes and services covered
by the verification scope.
2.5.2.3 The customer shall further be obliged to ensure that the designer and/or contractor:
— Perform their assigned tasks in accordance with the safety and integrity objectives established for the
pipeline project.
— Provide the owner and DNV in due time with all relevant information pertaining to the verification scope.
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Offshore Service Specification DNV-OSS-301, January 2014
Sec.2 Principles of Risk-Differentiated verification – Page 15
2.5.2.4 DNV shall be obliged to:
— Inform the customer of events or circumstances that, in the opinion of DNV, may jeopardise the pipeline
system integrity and/or the purpose and benefit of verification.
— Effectively perform all verification work and adjust, through a formalised change to the contract, the level
of verification involvement according to the actual performance of parties providing products, processes
and services.
2.5.3 Notification of level of verification involvement
2.5.3.1 An assessment of the required level of verification involvement for a project may be made by the owner
before preparing tender documents for design and construction activities. The owner can then specify this level
in Invitation to Tender (ITT) if a verification service is part of the scope of work. This will give contractors
guidance and reference when estimating the extent and cost of efforts associated with verification activities.
Guidance note:
For determination of the verification scope of work for certification based on this OSS, DNV shall independently of
the customer stipulate the level of verification involvement to be applied.
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2.5.3.2 The required level of verification involvement may be assessed by the owner using this OSS. If the
owner requires the contractor to carry out this assessment as part of his response to an ITT the owner should
provide the necessary information to enable the contractor to carry out this work. This information should
include overall safety objectives for the pipeline system as well as particulars, such as temperatures, pressures,
contents and environmental criteria, commonly contained in a design brief.
Guidance note:
Frequently, ITTs contain the statement “…. the contractor shall arrange 3rd party verification.” The use of the
information contained in this OSS should assist the owner to specify the required level of verification involvement
more precisely.
On other occasions where the verification is arranged by the owner, it is be important that contractors are informed of
the level of verification involvement planned.
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Sec.3 Verification activities – Page 16
SECTION 3 VERIFICATION ACTIVITIES
3.1 General
3.1.1 Objectives
3.1.1.1 The objectives of this section are to provide:
— an overview of verification activities relating to offshore pipeline systems
— generic scope of work tables for verification at the three levels of verification involvement, Low (L),
Medium (M) and High (H).
3.1.2 Scope of work
3.1.2.1 The process of defining a verification plan with a scope of work is described in [2.4]. Responsibilities
and requirements to the definition of the verification plan are addressed in [1.1.3] and [1.1.4] for verification
service and certification service, respectively.
3.1.2.2 The verification activities described in the scope of work tables are generic. Their relative risk rating,
represented by the type of involvement at the different verification involvement levels, is experienced based
and does not take into account the specifics or differences between flow-line and export lines, sweet and sour
gas, etc.
3.2 Project phases
3.2.1 General principles
3.2.1.1 DNV’s verification scope for pipeline systems is based on distinct project phases and the recognition
of key milestones.
3.2.1.2 The verification process may follow the project phases:
3.2.1.3 Project initiation:
— conceptual design
— basic design / FEED (Front End Engineering Design).
3.2.1.4 Project realisation:
—
—
—
—
—
detail design
construction/fabrication
construction/installation
pre-commissioning
project completion.
3.2.1.5 Project operation:
— commissioning, operations, maintenance and repair.
Guidance note:
The above phases generally follow the main sections of DNV-OS-F101. Where projects or other standards use other
terms, these can be used provided they are well defined and agreed.
Appendix C includes some generic descriptions of typical sub-phases. This may be used as guidance when agreeing
the content or completeness of a sub-phase.
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3.3 Project initiation
3.3.1 Verification during conceptual design
3.3.1.1 Verification during early stages of a project can reduce the need for verification during the design and
construction phases. The scope of work shall be agreed in each case.
3.3.1.2 It is advisable to combine the design verification during conceptual design with additional review of:
— environmental aspects
— project schedule
— project cost.
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Sec.3 Verification activities – Page 17
3.4 Project realisation
3.4.1 General
3.4.1.1 All design and construction aspects relevant to pipeline integrity may be covered by the verification
service. During design the specifications (requirements) are developed, while the construction procedures
describe how the requirements shall be satisfied and implemented during construction.
3.4.2 Verification of overall project management
3.4.2.1 Verification of the overall project management is the examination of the means of controlling the
pipeline project.
3.4.2.2 This verification is to confirm that the necessary controls are in place to ensure information flows
across the various interfaces. This is especially important where separate contractors have been employed for
different phases of the project such as design and installation.
3.4.2.3 Typically, it is expected that the quality management documentation is in line with ISO 9001
requirements.
3.4.2.4 Definition of scope of work for verification of overall project management at the different levels of
verification involvement should follow Table 3-1.
Table 3-1 Scope of work for verification of overall project management
Verification activity
L
Review of the project management process by:
— review of project quality management documentation
— audit of project quality management system
— review of sub-contractor control
— review of interface controls
— review of methods of information flow
x
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
3.4.3 Verification during design
3.4.3.1 Design verification is the examination of the assumptions, methods and results of the design process
and is performed at the specified level of verification involvement to confirm that the requirements to the
specific pipeline system will be fulfilled.
3.4.3.2 Design verification shall consist of one, or more, of:
—
—
—
—
—
reviewing the design process
reviewing specifications for design
reviewing design reports and drawings
performing independent parallel calculations
reviewing specifications for construction and operation, resulting from design.
3.4.3.3 The documents that should be produced in the design phase are given in DNV-OS-F101 Sec.12 B100B600.
3.4.3.4 Definition of scope of work for verification of design at the different levels of verification involvement
should follow Table 3-2.
Table 3-2 Scope of work for verification of design
Verification activity
L
Review of the design process by:
— review of design quality management documentation
— audit/attend owner’s audit of design quality management system
Review of specifications for design by:
— review of the design basis with emphasis of the survey results and
environmental data. Evaluation of the design criteria
— review of pipeline routing1)
DET NORSKE VERITAS AS
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
Offshore Service Specification DNV-OSS-301, January 2014
Sec.3 Verification activities – Page 18
Table 3-2 Scope of work for verification of design (Continued)
Verification activity
L
Review of design reports and drawings by2):
— review of the main pipeline documentation to confirm that the main load
conditions have been accounted for in design, that the governing conditions
are identified, and that the chosen design philosophies including pipeline
safety system are in accordance with specified codes and standards
— evaluation of the main methods used and spot checks of the input data and
the calculation results
— detail review of main design reports
Performing independent parallel calculations by:
— check of wall thickness
— simplified independent analyses/ calculation(s) performed by spot checks
— advanced independent analyses/ calculation(s) performed by spot checks
Review of specifications for construction and operation by:
— spot check of critical aspects
— review of main specifications
— detailed review of main specifications
Review of flow assurance (non-integrity aspects3)) by:
— general principles
— review of main documents supported by simplified analyses
x
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Notes:
1)
Verification activity to be agreed case by case considering aspects as
— general knowledge of the area
— criticality of the results.
2)
3)
If the pipeline system is designed for different pressures along the pipeline (segmented design) this should be reflected in the
verification scope of work regarding flow assurance, in addition to wall thickness, safety systems, etc.
These are optional certification services.
Guidance note:
Design verification activities may be split between Basic Design (sometimes called FEED, and which may performed
as a part of the Project Initiation phase) and Detailed Design, or other sub-phase, depending on type of contract.
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3.4.4 Verification during construction
3.4.4.1 Verification during construction shall be carried out by means of full time attendance, audits,
inspections or spot checks of the work, as appropriate, in sufficient detail to confirm that the specified
requirements of the pipeline system will be fulfilled.
3.4.4.2 Verification of these activities relates not only to the contractor’s work, but also to the monitoring of
this work carried out by others.
3.4.4.3 During construction verification shall consist of one, or more, of:
—
—
—
—
—
reviewing the construction engineering
reviewing construction procedures
reviewing qualification process
surveillance during construction activities
reviewing final documentation.
3.4.4.4 The documents that should be produced in the project are given in DNV-OS-F101 Sec.12 C100, C200,
C300, D100 and D200.
3.4.4.5 Definition of scope of work for verification of construction at the different levels of verification
involvement should follow Table 3-3 and Table 3-4 for manufacturing and fabrication, Table 3-5 for
installation, Table 3-6 for final testing and project completion, and Table 3-7 for pipeline control and safety
systems.
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Offshore Service Specification DNV-OSS-301, January 2014
Sec.3 Verification activities – Page 19
Table 3-3 Scope of work for verification of manufacturing and fabrication of linepipe, incl. external
linepipe coating, and other pressure containing components
Verification activity
L
Review of the manufacturing & fabrication process by:
— review of manufacturing and fabrication management systems
— audit or attend owner’s audit of the quality management system
Review of manufacturing & fabrication procedures by:
— review manufacturing, fabrication and inspection procedures for
confirmation of compliance with the manufacturing specifications
Review of qualification process by:
— review the manufacturing procedure specification, (MPS), and
manufacturing procedure qualification test (MPQT), if applicable
— full time attendance during MPQT, if applicable, or first day production
Surveillance during manufacturing and fabrication activities by:
— visit-based attendance during testing, to confirm, based on spot checks, that
the delivered products have been produced in accordance with the
manufacturing specification
— visit-based or full-time attendance during manufacturing and fabrication to
confirm, based on spot checks, that the delivered products have been
produced in accordance with the manufacturing specification
— full-time attendance during manufacturing and fabrication to confirm, based
on spot checks, that the delivered products have been produced in
accordance with the manufacturing specification
Review of final documentation
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Table 3-4 Scope of work for verification of manufacturing and fabrication of coatings (internal
coating and concrete coating), anodes and other non-pressure containing components
Verification activity
L
Review of the manufacturing & fabrication process by:
— review of manufacturing and fabrication management systems
— audit/attend owner’s audit of the quality management system
Review of manufacturing & fabrication procedures by:
— review manufacturing, fabrication and inspection procedures for
confirmation of compliance with the manufacturing specification
Review of qualification process by:
— review the manufacturing procedure specification, (MPS), manufacturing
procedure qualification test (MPQT), if applicable
— full time attendance during MPQT, if applicable, or first day production
Surveillance during manufacturing and fabrication activities by:
— visit-based attendance during testing, manufacturing and fabrication to
confirm, based on spot checks, that the delivered products have been
produced in accordance with the manufacturing specification
Review of final documentation
x
x
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
x
x
Guidance note:
Line pipe and other materials may be ordered with certificates (e.g. 3.2 according to EN 10204). This can be integrated
in the overall verification activities, so as not to duplicate work.
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Sec.3 Verification activities – Page 20
Table 3-5 Scope of work for verification of installation
Verification activity
L
Review of the installation process by:
— review of installation management systems
— audit/attend owner’s audit of the quality management system
Review of installation engineering documentation by:
— spot check of installation manual (IM)1)
— review of installation analyses
— for critical operations (identified from the FMEA and HAZOP studies)
review the IM
Review of qualification process by:
— for critical operations, review the qualification of the IM
— full time attendance during qualification tests, if applicable, or production
start-up
Surveillance during installation activities by:
— visit based (one shift) attendance during start up of each operation (i.e.
pipelaying, riser installation, onshore sections installation, intervention
works, etc.)
— full time attendance during tension trials and associated lay tests: visit based
(one shift) attendance during installation
— full time attendance at each operation (i.e. pipelaying, onshore section
installation, riser installation, intervention works, etc.)
Review of final documentation
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Note:
1)
Installation Manual (IM) is defined as a document or collection of documents required for performing the project specific
installation work including normal operations and contingency handling/operations and acceptance criteria.
Table 3-6 Scope of work for verification of pre-commissioning, as-built survey and project completion
Verification activity
L
Review of the process by:
— review of management systems
— audit/attend owner’s audit of the quality management system
Review of procedures by:
— review of the procedures for pre-commissioning
Surveillance during testing and completion activities by:
— full time attendance during pressure testing
— visit based attendance during cleaning, gauging, de-watering and drying.
Review of final documentation
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Table 3-7 Scope of work for verification of pipeline control and safety systems
Verification activity
L
Review of the process by:
— review of management systems
— audit/attend owner’s audit of the quality management system
Review of procedures by:
— review of the procedures and test plans
Surveillance during testing and validation by:
— visit based attendance
— full time attendance
Review of final documentation
DET NORSKE VERITAS AS
x
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
Offshore Service Specification DNV-OSS-301, January 2014
Sec.3 Verification activities – Page 21
3.5 Operation
3.5.1 Verification during operation
3.5.1.1 Verification during operation shall be carried out by audits or spot checks of the work and records in
sufficient detail to confirm that the specified requirements of the pipeline system continue to be fulfilled and
thereby confirming that the pipeline system integrity is maintained.
3.5.1.2 Assessment of these activities shall relate to the owner’s, as well as any contractor’s, work.
3.5.1.3 These assessments shall consist of:
— review of operations processes:
—
—
—
—
review of operations management systems
audit of the quality management system, if necessary
risk assessments
implementation of commissioning, operation and inspection philosophies.
— review of operations manual, specifications and procedures:
—
—
—
—
—
—
commissioning procedures
confirmation of design assumptions
method statements
inspection plans
inspection methods
procedures for evaluation of inspection results.
— attendance during operations activities:
— attendance during inspections, e.g. by modifications and repairs.
— review of monitoring and inspection records and assessments.
3.5.1.4 The documents that shall be produced in the project are given in DNV-OS-F101 Sec.12 E, F.
3.5.1.5 Scope of work for verification in the operations phase at the different levels of verification involvement
should follow Table 3-8 for commissioning, Table 3-9 for operation and Table 3-10 for modifications and
repairs.
Table 3-8 Scope of work for verification of commissioning
Level of involvement
L
M
H
Verification activity
Review of the preparation process by:
— review of main documents to check compliance with applicable design
documentation
Surveillance during commissioning by:
— audit attendance
Review of final documentation
(x)
x
x
x
(x)
x
x
x
Table 3-9 Scope of work for verification of operation of the pipeline
Verification activity
L
Review of the preparation process by:
— review of main operating documents in the Integrity Management System1)
Review during operation by:
— start-up review of implementation of the Integrity Management System;
operational and safety philosophy, risk assessment and integrity
management plan
— review of regular assessment reports from operational records
— review of preparation for periodical surveys
— review of reports from periodical surveys
Surveillance during operation by:
— audit during start-up of periodical surveys
DET NORSKE VERITAS AS
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
x
x
x
Offshore Service Specification DNV-OSS-301, January 2014
Sec.3 Verification activities – Page 22
Table 3-9 Scope of work for verification of operation of the pipeline (Continued)
Verification activity
L
— audit in control room of procedures and quality management
Review of final documentation:
— Review of annual integrity assessment reports
x
Level of involvement
M
H
x
x
x
x
Note:
1)
Ref. DNV-RP-F116 Sec.2
Table 3-10 Scope of work for verification of modification and repairs
Verification activity
L
Review of the preparation process by:
— review of main modifications or repairs documents
Surveillance during modification and repair by:
— audit during start-up for significant modifications or repairs
— visit based attendance during modifications or repairs
— full time attendance during significant modifications or repairs
Review of final documentation:
— Review of modification and repair reports
— Review of resulting updates to the pipeline system documentation
Level of involvement
M
H
x
x
x
x
x
x
x
x
x
x
x
x
x
x
3.5.1.6 Annual assessments shall be carried out to confirm that any deterioration of the pipeline system is
within acceptable limits and that the pipeline continues to comply with the design code requirements. The
assessments shall include review of records confirming that the pipeline has been operated within its design
limits.
3.5.1.7 Additional assessments shall be carried out in case of damage, deterioration or modification to the
pipeline system to confirm that it continues to comply with the design code requirements.
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Offshore Service Specification DNV-OSS-301, January 2014
Sec.4 Verification service requirements – Page 23
SECTION 4 VERIFICATION SERVICE REQUIREMENTS
4.1 General
4.1.1 Objectives
4.1.1.1 The objectives of this section are to provide:
— details of DNV’s verification services for submarine pipeline systems
— details of DNV’s deliverables for verification service for submarine pipeline systems.
4.1.2 Scope of work
4.1.2.1 The verification service is described in [1.1.3].
4.1.2.2 The scope of work is determined by and shall be described in a contract between DNV and the
customer.
4.1.2.3 [2.4] describes the process of defining a risk-differentiated verification plan / scope of work. The
customer may stipulate the level of verification involvement.
4.1.2.4 The scope of work may refer to DNV-OS-F101 or to other recognized technical standards or
regulations.
4.1.2.5 The scope of work may be amended as agreed between DNV and the customer.
4.2 Verification service documents
4.2.1 General
4.2.1.1 The type of DNV documents that may be issued depends on the extent and nature of the verification
scope of work.
4.2.1.2 DNV may issue verification service deliverables during the execution of the verification scope, and at
its completion.
The purpose of the deliverables is to document the scope of work performed, and the conclusions reached, by
DNV. The verification documents typically follow the hierarchy shown in Figure 4-1 below.
Figure 4-1
Typical document hierarchy for verification service
4.2.2 Statement of conformity
4.2.2.1 A Statement of Conformity may be issued by DNV as a statement confirming that verification of
documents and/or activities has concluded that the pipeline system complies with specified requirements. In
order for DNV to issue a Statement of Conformity the following requirements apply:
— The scope shall cover the complete pipeline system or a major self-contained part of it. Major selfcontained part shall mean a complete system, or the integration of more systems, to which risk based
verification is or may be applied.
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Offshore Service Specification DNV-OSS-301, January 2014
Sec.4 Verification service requirements – Page 24
— DNV shall have accepted the level of verification involvement to be satisfactory in relation to the risks
associated with the pipeline system or self-contained part of it.
— It may be issued upon completion of the total verification scope, or at completion of logical phases, e.g.
design or fabrication.
— There shall not be omissions in the verification scope which may lead to misinterpretation of the Statement
of Conformity, e.g. in the design verification scope aspects like safety or structural integrity may not be
omitted from individual components or systems.
— There shall be no unresolved deviations, i.e. no open verification comments, which inherently infringe the
integrity of the pipeline system. In case of unresolved deviations, these shall be clearly identified in the
Verification Report, ref. [4.2.3.6].
— The statement is valid on the date of issue.
4.2.2.2 Alternatives to detailed requirements/solutions specified in DNV Offshore Standards may be accepted
by DNV provided the pipeline integrity and reliability level is documented to be equivalent or better than the
specified requirements/solutions. This principle of equivalence does not apply to verification against non-DNV
reference documents.
4.2.2.3 The Statement of Conformity shall be supported by a Verification Report, which shall be referenced
from the Statement of Conformity.
4.2.3 Verification report
4.2.3.1 A Verification Report may be issued by DNV as a statement confirming the conclusion of the
verification process. A Verification Report may in principle be issued at any stage of the verification process.
4.2.3.2 A Verification Report shall be issued in conjunction with a Statement of Conformity.
4.2.3.3 A Verification Report may be in the form of a close-out report covering the completion of a selfcontained part of the verification of a pipeline system.
4.2.3.4 A Verification Report may be the final deliverable if the requirements to a Statement of Conformity
are not fulfilled or a Statement of Conformity is not required.
4.2.3.5 Deviations from requirements shall be highlighted in the Verification Report. In the summary and/or
in the introduction, it shall be stated if there are unresolved deviations, with a reference to where in the report
they are addressed in detail. Deviations that are addressed through alternative solutions shall be included in the
list. Such solutions may imply e.g. operational limitations.
4.2.3.6 In summary, the Verification Report shall include:
—
—
—
—
—
—
Reference to the contract under which the work has been carried out.
Product or service description and item number, if relevant.
Application (operational limitations and conditions of use) for which the product is intended.
Verification scope of work, including level of verification involvement, if applicable.
Codes and Standards which the product or service has been verified against.
Clear statement of the conclusion from the verification (does it or does it not meet the specified
requirements).
— List of documentation on which the verification report is based (reports, drawings, correspondence etc.).
— Unresolved deviations/non-conformities (open comments).
4.2.4 Intermediate documents
4.2.4.1 DNV may issue intermediate documentation of progress or conclusion related to individual
verification elements:
— a document review
— a site visit
— a test.
4.2.4.2 Intermediate deliverables may be in the form of:
—
—
—
—
—
verification comments (may be listed in VerCom [C.1.4], letter, email or other agreed communication type)
visit report
audit report
survey report
project progress reports.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.5 Certification service requirements – Page 25
SECTION 5 CERTIFICATION SERVICE REQUIREMENTS
5.1 General
5.1.1 Objectives
5.1.1.1 The objectives of this section are to provide:
— an overview of certification service relating to submarine pipeline systems
— details of DNV’s certification services for submarine pipelines systems.
5.1.2 Scope of work
5.1.2.1 The certification service is described in [1.1.4] and is part of the certification requirements.
5.1.2.2 The process of defining a verification plan with a scope of work is described in [2.4].
5.1.2.3 For a DNV Certificate of Conformity for the design and construction phase, at project completion, the
scope of work shall include the verification activities described in the scope of work [3.4], Table 3-1 to Table
3-6 and, if relevant, Table 3-7. The scope of work is further defined by the result of the DNV risk assessment
and the resulting conclusion with regard to applicable level of involvement. During the project the correctness
and relevance of the DNV risk assessment shall be revisited by DNV and if applicable the level of involvement
for parts of the scope shall be adjusted. Additional verification activities may also result from the updated risk
assessments. Changes to the scope of work and level of involvement shall be reflected in the formal verification
plan.
5.1.2.4 The verification plan shall state clearly the physical boundaries of the pipeline system covered by the
verification scope of work. The certificate shall not extend significantly beyond the pipeline system designed
according to DNV-OS-F101, neither shall it include major components not covered in the scope of work tables
in Sec.3.
Guidance note:
Other non-pressurised components and structures like pipeline manifolds, riser bases and valve protections structures
may be part of the verification scope. Guidance for verification involvement is given in other offshore service
specifications in the OSS series.
---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---
5.1.2.5 The verification scope of work for certification service shall be in accordance with the scope
requirements of this OSS. Generally, this verification scope of work should not be amended.
Guidance note:
The objective of the certification service is pipeline integrity (ref [1.1.4]) and the generic scope of work tables are
defined for meeting this objective.
Other objectives and other aspects, such as the verification of the environmental impact of the pipeline system, or its
suitability with respect to flow capacity and flow assurance, may be included in DNV’s scope of work, if desired by
the customer. However, this work shall then be undertaken as a verification service and defined and reported
separately from the certification work.
---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---
5.1.2.6 For a DNV Certificate of Conformity to be retained in the operation phase, a certificate with
maintenance conditions, ref. [5.2.2], the additional scope of work shall include the verification activities
described in the scope of work [3.5], Table 3-8 to Table 3-9 and, if relevant, Table 3-10. The scope of work is
further defined by the result of the DNV risk assessment and the resulting conclusion with regard to applicable
level of involvement. During the certificate maintenance period the correctness and relevance of the DNV risk
assessment shall be revisited by DNV and if applicable the level of involvement for parts of the scope shall be
adjusted. Additional verification activities may also result from the updated risk assessments. Changes to the
scope of work and level of involvement shall be reflected in the formal verification plan.
5.1.2.7 Conditions and scope of work for retention of certificate during pipeline operation is further described
in [5.3].
5.2 Certification service documents
5.2.1 General
5.2.1.1 DNV may issue certification service deliverables during the execution of the verification scope, and at
its completion. The purpose of the deliverables is to document the scope of work performed, and the
conclusions reached, by DNV. The deliverables pertaining to certification services consist in principle of the
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.5 Certification service requirements – Page 26
same type of documents as the verification service deliverables, however, with an overlying Certificate of
Conformity. Hence, the general hierarchy of documents is typically as illustrated in Figure 5-1.
Figure 5-1
Typical document hierarchy for certification service
5.2.1.2 The types of documents issued by DNV for the different stages of the certification process are
illustrated in Table 5-1.
Table 5-1 Pipeline certification – Documents provided by DNV
Reference Standard
for certification
Offshore Standard DNV-OS-F101 Submarine Pipeline Systems
Commissioning,
Operation,
Modifications and
repair
Installation
Manufacturing of
Pipeline
Components
and Assemblies
Manufacturing of
Corrosion
Protection
and Weight
Manufacturing of
Linepipe
Statement of Conformity for individual phase
or natural part thereof
OPERATION
Project
Completion
Types of
Verification
Certification
Report
Documents Provided
CONSTRUCTION
Detail
Design
Project Phases
Conceptual
Design
DESIGN
Certificate
of
Conformity
Certificate of
Conformity
(retention)
5.2.2 Certificate of conformity
5.2.2.1 A Certificate of Conformity may be issued by DNV as a formal statement confirming that verification
of documents and activities has concluded that the pipeline system has been designed and constructed in
accordance with specified requirements, i.e. with a positive conclusion on the verification work and without
pending verification comments. The Certificate of Conformity shall, as a main rule, cover the complete pipeline
system and be issued upon successful completion of the verification scope of work for the certification.
5.2.2.2 A Certificate of Conformity may be issued with maintenance conditions for retention of the certificate
during the operation phase of a pipeline system, ref. [5.3].
5.2.2.3 The Certificate of Conformity shall be supported by Statements of Conformity and/or one or more
Verification Reports, which shall be referenced from the Certificate of Conformity.
5.2.2.4 In cases where only one Statement of Conformity would be required, the Statement of Conformity
should be omitted.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.5 Certification service requirements – Page 27
5.2.2.5 The Certificate of Conformity is valid on the date of issue, unless it has been issued with maintenance
conditions and specified validity period, ref. [5.3].
5.2.3 Statement of conformity
5.2.3.1 A Statement of Conformity may be issued by DNV as a statement confirming that verification of
documents and/or activities has concluded that the object complies with specified requirements. In order for
DNV to issue a Statement of Conformity the following requirements apply:
— It shall cover the complete, integrated installation/facility or a major self-contained part of it. Major selfcontained part shall mean a complete system, or the integration of more systems, to which risk based
verification is or may be applied.
— It may be issued upon completion of the total verification scope, or at completion of logical phases, e.g.
design or fabrication.
— There shall not be omissions in the verification scope which may lead to misinterpretation of the Statement
of Conformity, e.g.; in the design verification scope aspects like safety or structural integrity may not be
omitted from individual components or systems.
— There shall be no unresolved deviations, i.e.; no open verification comments, which inherently infringe the
safety and/or integrity of the pipeline system.
— The statement is valid on the date of issue.
5.2.3.2 Alternatives to detailed requirements/solutions specified in DNV Offshore Standards may be accepted
by DNV provided the pipeline integrity and reliability level is documented to be equivalent or better than the
specified requirements/solutions. This principle of equivalence does not apply to verification against non-DNV
reference documents.
5.2.3.3 The Statement of Conformity shall be supported by a Verification Report, which shall be referenced
from the Statement of Conformity.
5.2.3.4 In case a Statement of Conformity, according to the contract, shall not be issued, other documents
issued by DNV, like the accumulated Verification Reports, Verification Letters, status reports etc. may
constitute the appropriate supporting documentation for the Certificate of Conformity. Such documents shall
then be referenced from the Certificate of Conformity, e.g. in the form of an attached list of relevant documents.
Traceability shall be ensured.
5.2.4 Verification report
5.2.4.1 Verification as part of a certification service shall be documented by a Verification Report, ref. [4.2.3].
A Verification Report may be issued by DNV as a statement confirming the conclusion of the verification.
5.2.4.2 A Verification Report shall be issued in conjunction with a Statement of Conformity and/or a
Certificate of Conformity.
5.2.5 Intermediate documents
5.2.5.1 DNV may issue intermediate documentation of progress or conclusion on individual verification
elements. For description of intermediate documents see [4.2.4].
5.3 Retention of pipeline certificate
5.3.1 General
5.3.1.1 The certification service may include verification in order to retain the pipeline certificate during the
operations phase.
5.3.1.2 A prerequisite for the retention of validity of pipeline certificate in the operations phase is that an inservice contract has been established between the owner and DNV.
5.3.1.3 Retention of the pipeline certificate may only take place if the certificate is issued with maintenance
conditions.
5.3.2 Certificate of conformity with maintenance conditions
5.3.2.1 A DNV Certificate of Conformity with maintenance conditions may be issued by DNV as a formal
statement confirming that verification of documents and activities has concluded that the pipeline system has
been designed, constructed, commissioned and is operated in accordance with specified requirements. In
addition to this statement, the pipeline certificate with maintenance conditions shall contain:
— conditions of validity
— signature positions for confirmation of annual assessment.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
Sec.5 Certification service requirements – Page 28
5.3.2.2 The period of validity of a pipeline certificate shall not exceed 5 years. After that period the pipeline
certificate may be reissued, provided a satisfactory overall condition assessment has been carried out.
5.3.3 Requirements for pipeline certificate retention
5.3.3.1 A pipeline systems in operation may retain the pipeline certificate provided:
— the owner provides documentation from commissioning, operation, inspection and maintenance activities
to demonstrate continued compliance with the design assumptions
— the owner maintains any installed systems for condition monitoring and carries out condition evaluations
as applicable
— information about damages, repairs and modifications, which may affect the certification, is promptly
reported to DNV
— any nonconformity report issued by DNV is acted upon within the specified time.
5.3.3.2 The customer (operator/owner) shall provide DNV with the plans, specifications and procedures
concerning operation, inspection and maintenance activities for acceptance. DNV acceptance is required for:
—
—
—
—
operating and maintenance procedures and revisions to them
inspection programmes and requirements
inspection scopes of work
condition monitoring programmes.
5.3.3.3 The customer shall provide DNV with:
— relevant operation reports
— inspection results
— condition monitoring report findings.
5.3.3.4 The customer shall notify DNV immediately if:
— the pipeline system is damaged, or is suspected of having been damaged in a manner likely to impair the
pipeline integrity
— the pipeline system demonstrates signs of deterioration likely to impair its integrity
— the pipeline system is to be subjected to any modifications or repairs, which may impair its integrity
— the pipeline is abandoned.
5.3.3.5 The pipeline certificate may be withdrawn if the customer fails to:
— comply with the operational procedures accepted by DNV
— carry out the regular in-service inspection and maintenance programme according to the procedures
accepted by DNV
— comply with any nonconformity report issued by DNV.
— inform DNV as required by [5.3.3.3] and [5.3.3.4], and/or the pipeline integrity is assessed by DNV to be
or become impaired.
5.3.3.6 Once a nonconformity report is issued by DNV, the validity of the Certificate of Conformity is
conditional upon successful completion of the required corrective action within a specified time limit. The
customer shall notify DNV upon the implementation of corrective actions, to enable DNV to verify the work.
5.3.3.7 A verification report shall be issued upon verification of any modification or repair of the pipeline
system. No new pipeline certificate will be issued.
5.3.3.8 Pipeline systems that are temporarily out of service shall be subject to periodical inspections if the
pipeline certificate is to be retained. The inspection requirements and re-commissioning procedures shall be
subject to DNV’s acceptance prior to re-start.
5.3.3.9 If the conditions leading to withdrawal of the pipeline certificate no longer exists, the pipeline
certificate may be reinstated. The pipeline system may be subject to special assessment or monitoring prior to
and following reinstating of the pipeline certificate.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.A Guideline on selection of verification involvement level based on simplified verification planning – Page 29
APPENDIX A
GUIDELINE ON SELECTION OF VERIFICATION INVOLVEMENT LEVEL
BASED ON SIMPLIFIED VERIFICATION PLANNING
A.1 General
A.1.1 General principles
A.1.1.1 The selection of the level of verification involvement depends on the criticality of each of the elements
that have an impact on the management of risks to the pipeline system.
A.1.1.2 The verification process shall direct greatest effort towards those elements of the pipeline system
where the risk is highest and whose failure or reduced performance will have the most significant impact on:
—
—
—
—
pipeline integrity
safety risks
environmental risks
business risks.
A.1.1.3 Suitable selection factors include, but are not limited to, the:
—
—
—
—
—
overall safety objectives for the pipeline system
assessment of the risks associated with the pipeline and the measures taken to reduce these risks
degree of technical innovation in the pipeline system
experience of the contractors in carrying out the work
quality management systems of the owner and its contractors.
A.1.1.4 Due to the diversity of various pipeline systems, their contents, their degree of innovation, the
geographic location, et cetera, it is not possible to give precise instructions on how to decide what level of
verification involvement is appropriate for each particular pipeline system.
A.1.1.5 Therefore, guidance is given as a series of questions that should be answered when deciding the
appropriate level of verification involvement for a pipeline system. This list is not exhaustive and other
questions should be added to the list if appropriate for a particular pipeline system.
A.1.1.6 It must be emphasised that the contribution of each element should be judged qualitatively and/or
quantitatively. Preferably quantified risk assessment data should be used to provide a justifiable basis for
decisions.
A.1.1.7 Depending of the stage of the project, the activities may not have taken place yet, in which case the
questions can also be posed in another form, i.e. “Is …. planned to be?”
A.2 Trigger Questions
A.2.1 Overall safety objective
— Does the safety objective address the main safety goals?
— Does the safety objective establish acceptance criteria for the level of risk acceptable to the owner?
— Is this risk (depending on the pipeline and its location) measured in terms of human injuries as well as
environmental, economic and political consequences?
A.2.2 Assessment of risk
— Has a systematic review been carried out to identify and evaluate the probabilities and consequences of
failures in the pipeline system?
— Has this review judged the contribution of each element qualitatively and quantitatively and used, where
possible, quantified risk assessment data to provide a justifiable basis for any decisions made?
— Does the extent of the review reflect the criticality of the pipeline system, the planned operation and
previous experience with similar pipeline systems?
— Does this review identify the risks associated with the operation of the pipeline system and with the health
and safety of personnel associated with it or in its vicinity?
— Has the extent of the identified risks been reduced to a level as low as reasonably practicable by means of
one or both of:
— reduction in the probability of failure
— mitigation of the consequences of failure?
— Has the result of the systematic review of the risks been measured against the owner’s safety objective?
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.A Guideline on selection of verification involvement level based on simplified verification planning – Page 30
— Has the result of this review been used in the selection of the appropriate verification involvement level?
A.2.3 Technical innovation
— Has the degree of technical innovation in the pipeline system been considered?
— Has it been considered that risks to the pipeline are likely to be greater with a high degree of technical
innovation than with a pipeline designed, manufactured and installed to well-known criteria in well-known
waters?
— Have factors been considered in the selection of the appropriate level of verification involvement such as:
— degree of difficulty in achieving technical requirements
— knowledge of similar pipelines
— effect of the new pipeline on the surrounding area?
A.2.4 Contractors’ experience
— Has the degree of risk associated with the pipeline system been considered where design, construction or
installation contractors are inexperienced?
— Has the degree of risk been considered where the contractors are experienced but not in similar work?
— Has the degree of risk been considered where the work schedule is tight?
A.2.5 Quality management systems
— Have all parties involved in the pipeline system implemented an adequate quality management system to
ensure that gross errors in the work are limited?
— Do these parties include the:
—
—
—
—
—
owner
design contractor
construction contractors
installation contractor
operator?
— Do the factors considered when evaluating the adequacy of the quality management system include:
—
—
—
—
—
whether or not an ISO 9001 or equivalent certified system is in place
results from external audits
results from internal audits
experience with contractors’ previous work
project work force familiarity with the quality management system?
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.B Generic description of project sub-phases – Page 31
APPENDIX B
GENERIC DESCRIPTION OF PROJECT SUB-PHASES
B.1 General
B.1.1 Introduction
B.1.1.1 A great deal of confusion can occur in projects over the precise definition of the various project phases.
The terms are not, by themselves, important provided that everybody working on a particular project has a
consistent understanding of the definitions of the project sub-phases.
B.1.1.2 Some examples of descriptions of project sub-phases or milestones are given below. These
descriptions are not intended to be universal definitions, but are given as suggestions as to how particular
project specific definitions may be formulated.
B.2 Initial studies
B.2.1 Feasibility study
B.2.1.1 A feasibility study is a study directed at evaluation of the feasibility of one or more concepts.
B.2.1.2 The feasibility study is an evaluation of one or more proposed technical concepts against project cost
and schedule. It should identify special technical problems and indicate the solution or solve these to the degree
necessary to confirm the feasibility of the project cost and schedule.
B.2.1.3 The feasibility study shall address all essential cost and schedule aspects, and should conclude on what
the most uncertain factors are and how they should be approached. It should preferably also address aspects
such as environmental impacts, special legislation etc. that are peripheral to pipeline integrity.
B.2.2 Concept study
B.2.2.1 A concept study is a design made to establish the main dimensions and data of the pipeline.
B.2.2.2 These include, for example, diameter, wall thickness, design pressure segmentation, stability
requirements, material type, corrosion protection and operation philosophy. Other aspects include
establishment of a route corridor and identification of possible needs for major intervention works and/or
(additional) surveys. In short, the study has to establish the basic parameters for the work to be performed in
the next stages of design and a means for more detailed cost estimation and possibly comparison of a number
of concepts detailed to the same level.
B.2.2.3 It is expected only to indicate the preferred/possible methods or solutions of how to solve landfall
zones, connection, installation, dropped object/trawl protection, expansion, major intervention etc. On this
basis it is expected that the concept study documentation identifies how far the design has reached, what needs
to be further detailed/investigated and how the designer foresees the use of the given information as part of the
subsequent design.
B.3 Design
B.3.1 FEED / Basic design
B.3.1.1 Basic design is a design made to establish the main dimensions and data of the pipeline to a level where
it is possible to make a detailed cost estimate and to place fabrication orders without taking any significant
economic risk.
Guidance note:
The design phase is typically be split into FEED-phase, basic design and detail design. For each design phase, the
same design tasks are repeated, but to a successively increasing specific and detailed level.
---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---
B.3.1.2 The following should be defined; approximate route, diameter, wall thickness, design pressure
segmentation if applicable, stability requirements, isolation/cooling requirements, corrosion protection,
material type and total length of required linepipe, type and number of buckle arrestors, number and depth of
crossings, required seabed preparations, landfall design, dropped object/trawl protection requirements, number
and type of tie-ins and installation requirement, pre-commissioning and commissioning philosophies, safety
systems and operation philosophies.
B.3.1.3 On this basis, it is expected that a large part of the basic design documentation will be the final design
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.B Generic description of project sub-phases – Page 32
documentation and that it identifies what needs to be further detailed/investigated and how this shall be done
by the designer.
B.3.2 Detail design
B.3.2.1 Detail design means the finalisation of design. It can entail all stages of design, as it does not
necessarily have to be preceded by another distinct phase. It shall address all design issues for all items of the
pipeline system and finalise all the specifications for the subsequent production phases.
B.4 Other phases
B.4.1 General
B.4.1.1 Descriptions of other project phases, such as construction (manufacturing, fabrication, installation and
pre-commissioning), commissioning and operations are not given, as there is rarely any confusion of their
meaning or extent.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.C Examples of verification and certification documents – Page 33
APPENDIX C
EXAMPLES OF VERIFICATION AND CERTIFICATION DOCUMENTS
C.1 General
C.1.1 Introduction
C.1.1.1 This appendix includes example forms for use by DNV relating to verification and certification
services pertaining to pipeline systems.
C.1.1.2 The following forms are included:
—
—
—
—
—
certificate of conformity
statement of conformity
verification comments sheet
audit report
visit report.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.C Examples of verification and certification documents – Page 34
C.1.2 Certificate of conformity
Certificate No.:
DET NORSKE VERITAS
CERTIFICATE OF CONFORMITY
Owner:
Name of system/installation:
Location:
Description:
Main Operational Limitations:
Pressure:
Temperature:
Service:
N
O
I
Y
L
ON
e
d
trate
illus
form
th
THIS IS TO CERTIFY:
n of
iowith
s
r
That the above mentioned system/installation has been verified, by appropriate methods, to comply
the
requirements of
e
v
rent
, for the main operational limits stated above, and further outlined in the Reference
listed below.
curdocuments
T
S
LU
T
A
R
om
at fr
h
w
me
the
Certification Involvement:
o
The certification of the above mentioned system/installation hasebeen
t s performed in accordance with DNV Offshore Service
DNV-OSS-3
scope of work described in the Reference documents
Specification for Cerification of
, DNV
OSS with theddetailed
evia
y
a
mentioned below.
. It m
IL
tion
stra
The certification of the abov
e mentioned
above
r illusystem/installation has included:
y fo
l
e
l
- (list of scope)
so
ded
rovi
p
The detailed scope
re is of work is described in the appended DNV Verification report.
ictu
is p
Th
Validity:
This certificate is valid on the date of issue.
This certificate is not valid for systems/installations which are subject to classification by DNV.
Reference documents:
(appended)
Issued at (place) on (yyyy-mm-dd)
for Det Norske Veritas AS
(name)
Project Sponsor
DET NORSKE VERITAS AS, Veritasveien 1, NO-1322 Høvik, Norway, Tel.: +47 67 57 99 00, Org.No. NO 945 748 931 MVA.
Form No.: VER 02a Issue: 2013-10
DET NORSKE VERITAS AS
www.dnv.com
Page 1 of 1
Offshore Service Specification DNV-OSS-301, January 2014
App.C Examples of verification and certification documents – Page 35
C.1.3 Statement of conformity
Statement No:
DET NORSKE VERITAS
STATEMENT OF CONFORMITY
Owner:
Name of system/installation:
Location:
Description:
Main Operational Limitations:
Pressure:
Temperature:
Service:
N
O
I
Y
L
ON
e
form
ted
a
r
t
illus
th
THIS IS TO VERIFY:
n of
rsiowith the requirements of
That the above mentioned system/installation has been verified, by appropriate methods, to comply
e
v
rent
, for the main operational limits stated above, and further outlined in the Reference
listed below.
curdocuments
T
A
R
the
om
r
f
t
a
Verification Involvement:
ewh
The verification of the above mentioned system/installation has ebeen
somperformed in accordance with DNV Offshore Service
t
Specification for Verification of
, DNV-OSS-3
with theddetailed
scope of work described in the Reference documents
DNV
DNV-OSS
evia
ay
m
mentioned below.
t
I
.
tion
stra
u
l
l
i
The verification of the above mentioned
system/installation
has included:
syst
for
lely
- (list of scope)
o
s
ded
rovi
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s
The detailed scope
work
is described in the appended DNV Verification report.
i
ure
pict
s
i
Th
Validity:
T
S
U
L
IL
This statement is valid on the date of issue.
Reference documents:
(appended)
Issued at (place) on (yyyy-mm-dd)
for Det Norske Veritas AS
(name)
Project Sponsor
DET NORSKE VERITAS AS, Veritasveien 1, NO-1322 Høvik, Norway, Tel.: +47 67 57 99 00, Org.No. NO 945 748 931 MVA.
Form No.: VER 01a Issue: 2013-10
DET NORSKE VERITAS AS
www.dnv.com
Page 1 of 1
Offshore Service Specification DNV-OSS-301, January 2014
App.C Examples of verification and certification documents – Page 36
C.1.4 Verification comments sheet
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.C Examples of verification and certification documents – Page 37
C.1.5 Audit report
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.C Examples of verification and certification documents – Page 38
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.C Examples of verification and certification documents – Page 39
C.1.6 Visit report
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 40
APPENDIX D
DETAILED SCOPE OF WORK TABLES FOR VERIFICATION
AND CERTIFICATION
D.1 General
D.1.1 Introduction
D.1.1.1 This appendix gives the format of the detailed scope of work tables that should be made for each
particular project.
D.1.1.2 The detailed project-specific scope of work tables for the chosen level of verification involvement
should be based on these tables. For pipeline project scenarios or components not covered in this Appendix,
similar tables with the same degree of details shall be made.
D.1.1.3 If any of the activities are moved from one phase to another, then this must be identified in the table
where it is removed. Similarly, the detailed table for the phase to where it is moved shall be amended.
Guidance note:
Typically, contractual boundaries may give natural splits of activities between phases. However, then it is even more
important to ensure that there is traceability as to which phases what activity belong and that this is conveyed to all
involved parties.
---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---
D.2 Description of terms used in the scope of work tables
D.2.1 General
D.2.1.1 The following abbreviations and definitions have been used:
—
—
—
—
—
X is part of scope; attendance at meeting, issue report, etc.
A is Audit
S is Surveillance
I is For Information
R is Review.
D.2.1.2 These abbreviations are DNV’s preferred terms and should be used in DNV-generated documents.
However, other terms, for example monitoring or witnessing, may be used by DNV if these are the terms
commonly used in documents, such as Inspection and Test Plans, generated by others. In that case, it is
expected that these other terms are defined in these documents.
D.2.2 Audit
D.2.2.1 Systematic, independent and documented process for obtaining audit evidence and evaluating it
objectively to determine the extent to which audit criteria are fulfilled. (ISO 9001: 2008).
Guidance note:
This activity differs from the Surveillance by being focused on the adherence to and completeness and robustness of
the procedures and not on the actual result of the procedure (although this is not ignored). Further, the audit is
normally a ‘one-off’ activity as opposed to the continuity in monitoring.
---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---
D.2.3 Review
D.2.3.1 Systematic examination of reports and documentation. The depth of review will depend on the type of
document, any independent analyses/calculations performed by DNV, project phase and the level of
verification involvement. In principle, it is the solutions for the design, construction and operation elements
described in the documents that shall be verified.
D.2.3.2 The documents shall be divided into verification documents and reference documents. Verification
documents are the documents DNV shall verify. Reference documents are the documents against which the
verification documents are verified. DNV may rely on the information in the reference documents and shall
have no obligation to review, evaluate or verify this information. DNV may notify the customer of an error in
a reference documents, however, this does not mean that DNV reviewed, evaluated or verified the reference
document.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 41
D.2.3.3 The following shall be used to describe the extent of the examination if not otherwise specifically
defined:
— I = for information only
— R1 = for review of principles and general aspects, spot checks of input/output data
— R2 = for comprehensive review.
Guidance note:
Dependent on the project phase and kind of document, a comprehensive review (R2) may constitute review of details
of the document, and/or a verification of the interaction between conclusions from different documents and the totality
of the design.
Review of production records does not guarantee their correctness. It is a confirmation to DNV that the manufacturer
and/or sub-contractor has performed the required activity and issued a report.
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D.2.3.4 Reports that are reviewed by DNV shall, unless otherwise agreed, not be signed and stamped.
D.2.4 Surveillance
D.2.4.1 Continual monitoring and verification of the status of an entity and analysis of records to confirm that
specified requirements are being fulfilled.
Guidance note:
Other commonly used terms for surveillance are monitoring or witnessing.
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D.2.4.2 The amount of work involved in surveillance is not described in detail in the tables. This shall be part
of the final contractual scope of work which shall define the frequency of surveillance based on the overall
surveillance and the quality control performed by other parties as well as DNV’s experience.
D.2.4.3 The following shall be used to describe the frequency if not otherwise specifically defined:
— S1 = Surveillance on a visit basis, e.g. once per week
— S2 = Surveillance frequency minimum once per day
— S3 = Surveillance frequency minimum once per shift.
Guidance note:
These surveillance frequencies should be modified to correspond with production work flow.
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D.3 Overall project management
D.3.1 General
D.3.1.1 The project quality management system documentation shall be available at the early stages of the
project, preferably before design is underway, to ensure that the necessary controls are in place.
D.3.2 Detailed scope of work for overall project management
D.3.2.1 A detailed scope of work for verification the overall project management at different levels of
involvement is given in Table D-1.
Table D-1 Overall Project Management
Item
1
2
3
4
5
Description
Review of project quality management documentation
Audit of project quality management system
Review of sub-contractor control
Review of interface controls
Review of methods of information flow
DET NORSKE VERITAS AS
Low
R1
-
Level of involvement
Medium
High
R2
R2
A
A
I
R1
I
R1
I
R1
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 42
D.4 Design
D.4.1 General
D.4.1.1 For design verification a list similar to that given in Table D-2 and Table D-4 should be made for
specification of the minimum documentation requirement for each pipeline system.
D.4.1.2 The documentation of the items under General in Table D-2 shall be available at the early stages of
the design. All the remainder of the documentation listed in Table D-2 and Table D-4 should be completed and
be made available to DNV, if requested, before a Statement of Conformity on the design can be issued.
D.4.2 Design verification
D.4.2.1 DNV-OS-F101 Sec.3 B105 and Sec.12 A104 specifies that the design and planning for a pipeline
system shall cover all development phases including construction, operation and abandonment, and that all
documentation requirements shall be reflected in a document register. The documentation to be produced and
issues to be covered during design are given in DNV-OS-F101 Sec.12 B.
D.4.2.2 For certification of pipeline systems, the document register shall be made available to DNV for
identification of documents to be submitted for review for all project phases.
D.4.2.3 Table D-2 describes the issues to be verified and Table D-3 identifies the extent of independent
analyses/calculations included for the different levels of verification involvement.
D.4.2.4 Table D-4 and Table D-5 describe the issues to be verified in relation to flow assurance. This, if not
being an integrity matter, is offered as an additional verification/certification service.
Guidance note:
If the pipeline system is designed for different pressures along the pipeline (segmented design) this should be reflected
in the verification scope of work regarding flow assurance, in addition to wall thickness, safety systems, etc.
---e-n-d---of---G-u-i-d-a-n-c-e---n-o-t-e---
D.4.3 Low level design verification
D.4.3.1 The initial Low level of design verification involvement consists of a detailed document review of the
design basis, risk assessment/analysis documentation, quality management system documentation and (if they
exist) method or design philosophy documents. The presumed critical aspects of the project should be
identified by DNV from the initial review and conveyed to the customer for discussion and agreement on
correct understanding.
D.4.3.2 The subsequent verification consists of document review of the calculations/analysis methods used to
conclude the critical aspects. Other design documents are used as information and a few should be spot checked
for confirmation of the quality control.
D.4.3.3 Verification of implementation of the conclusions from design calculations/reports into specifications
and drawings is not included.
D.4.4 Medium level design verification
D.4.4.1 Medium level of design verification involvement consists of a review of all main design documents
related to pipeline safety and integrity. Less critical aspects shall be spot checked. The review shall be detailed
for all critical aspects and independent checks shall be performed.
D.4.4.2 Verification of implementation of the conclusions from design calculations/reports into specifications
and main drawings shall be included on a spot check basis.
D.4.5 High level design verification
D.4.5.1 High level of design verification involvement consists of a full review of most of the produced
documents related to pipeline integrity. The review shall be detailed for all critical aspects and independent
checks shall be performed.
D.4.5.2 Verification of implementation of the conclusions from design calculations/reports into specifications
and main drawings shall be included.
D.4.5.3 The main specifications shall also be checked for clearness and unambiguity.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 43
D.4.6 Scope of work for design
D.4.6.1 Detailed scope of work for design is given in Table D-2, Table D-3, Table D-4 and Table D-5.
Table D-2 Pipeline integrity design
Item
Description
General
1 Safety objective
Confirmation that the different contractors and sub-contractors’
2 quality systems meet the requirements of ISO 9001 (or approved
equivalent system)
3 Overall project organisation
4 Risk assessment and identification of critical aspects
5 Document register
Structural (main)
6 Design basis
7 Pipeline routing
8 Geohazards
9 3rd party interference assessment
8 Physical and chemical characteristics of fluid
selection including internal corrosion assessment (linepipe
9 Materials
and components)
10 Temperature/pressure profile (hydraulic/thermal analyses)
11 Wall thickness calculations
12 Stability
13 Pipeline expansion
14 Free span assessment
15 Upheaval buckling assessment
16 Lateral snaking assessment
17 Crossing design
18 Tie-in design, expansion spool calculations
19 Shore crossing assessment
20 Trawl interaction
21 Preliminary installation analyses
22 Trenching assessment
23 Spare philosophy
24 Fixed riser strength analyses
25 Fixed riser supports design
Structural (components)
26 Pig launcher/receiver design
27 Flange calculations
Valves design
28
— Finite element analysis
29 T-joints, isolation joints, etc.
Structural drawings
30 Pipeline route drawings
31 Detailed pipeline crossing drawings
32 Platform layout drawings
33 Spool drawings
34 Pipeline protection drawings
35 Riser and riser clamp drawings
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
I
I
I
I
R1
R2
I
R2
I
I
R2
I
R1
R2
R1
R1
I
I
I
I
R2
R1
R1
R2
I
R2
R2
R2
R2
R1
R1
R1
R2
I
R2
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
-
R1
R2
R2
R1
R2
R2
R2
R1
R2
R1
R2
R2
I
I
R2
I
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R1
R1
R2
R1
I
I
I
I
R1
R1
R1
I
R1
R1
R2
R2
R2
R2
I
I
I
I
I
I
R1
R1
R1
R1
R1
R1
R1
R1
R1
R2
R2
R1
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 44
Table D-2 Pipeline integrity design (Continued)
Item
Description
Linepipe and pipeline components (including welding)
36 Linepipe specifications
37 Welding specifications
38 Material take off/data sheets
Corrosion control systems and weight coating
39 Cathodic protection design report
40 Anode manufacturing and installation specifications
41 Coating manufacturing specifications
42 Field joint coating specification(s)
43 Corrosion monitoring system specification
44 Material take off/data sheets
Pipeline control and safety systems
45 Pipeline Control and Safety System Philosophy
46 Functional Safety Management Plan
47 SIL (Safety Integrity Level) Allocation Report for the Pipeline
Safety System
48 Safety Requirements Specification
49 SIL Verification Report
50 Pipeline Control System (PCS) Functional Design Specification
Flow assurance, if not specified according to Table D-4 and Table D-5
51 Flow assurance, including internal corrosion assessment
Low
Level of involvement
Medium
High
R1
I
-
R1
R1
I
R2
R2
R1
R1
I
I
I
I
-
R1
R1
R1
R1
R1
I
R2
R1
R1
R1
R1
R1
R1
R1
R1
R1
R2
R2
I
R1
R2
I
I
I
R1
R1
R1
R2
R1
R1
-
I
R1
Table D-3 Independent analyses/calculations for pipeline integrity design
Item
Activity
1
Wall
thickness
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Description
Wall thickness design calculations performed
according to the applicable code
Spot check simplified calculations according to DNVRP-F109
Stability
Dynamic non-linear FE analyses and assessment
according to DNV-RP-F109
Spot check simplified calculations according to DNVFree span RP-F105
assessment Free span assessment according to DNV-RP-F105
based on non-linear FE analyses
Simple hand calculations assuming uniform input
Expansion along the pipe
Non-linear FE analyses
Simple calculations according to DNV-RP-F110
Upheaval
Non-linear
FE analyses and assessment according to
buckling
DNV-RP-F110
Simple calculations according to DNV-RP-F110
Lateral
Non-linear
FE analyses and assessment according to
buckling
DNV-RP-F110
Simple calculations based on DNV-RP-F111
Trawling Non-linear FE analyses and assessment according to
DNV-RP-F111
Static FE analysis and assessment of load effects
Installation Static and dynamic FE analysis and assessment of load
effects
Spool
FE analysis
analyses
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
x
x
(x)
x
(x)
(x)
x
x
x
(x)
x
(x)
x
(x)
x
x
(x)
(x)
x
(x)
x
(x)
(x)
x
(x)
(x)
x
x
x
(x)
x
(x)
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 45
Table D-3 Independent analyses/calculations for pipeline integrity design (Continued)
Item
Activity
Description
Low
Level of involvement
Medium
High
(x)
x
18
Riser
Static FE analysis (of fixed risers only)
analyses
Soil
Calculate pipe-soil characteristic to be used in other
assessment design calculations
(x)
x
19
Corrosion Cathodic protection analysis according to applicable
protection code and project specifications
(x)
x
17
Internal
(x)
x
corrosion Assessment of internal corrosion mechanisms
x = analysis/check should be included in the scope of work (as applicable)
(x) = analysis/check should be included in the scope of work if the issue is identified as critical or highly utilised. Then
final decision of inclusion in scope of work will be a result of the document review of simple analysis.
20
Table D-4 Flow assurance design
Item
Description
Design Basis
1 Pipeline topography
2 Pipe dimension, wall thickness, internal roughness
3 Insulation (thickness), trenching, embedment
4 Material properties for soil, insulation, pipe, weight coating (thermal
conductivity, heat capacity, density)
5 Environmental conditions (meteocean data)
6 Production profiles (along the pipeline if segmented design)
7 Hydrocarbon composition, water cut, Equation of State (EoS)
Operational requirements (arrival pressure and/or temperature, inlet
8 pressure and/or temperature, cool-down time, slug sizes, WDP,
HDP, capacity)
9 Subsea templates/expansion loops
Steady State Thermo-hydraulic Report
10 Pipeline model
11 Pipe dimension/capacity of pipeline
12 Steady state pressure and temperature profiles
13 Flow regimes/slugging1)
14 Anode temperatures
15 Heating
16 Pipeline insulation system
17 Overall heat transfer coefficient
18 Hydrate analysis
19 Wax formation analysis
20 Sizing of methanol/glycol injection system
21 Effect of pipeline trenching and soil properties
Other Aspects
22 Sand accumulation
23 Erosion in piping system
24 Erosion of chokes and valves
25 Internal corrosion
26 Asphaltenes1), scale1), black/white/red powder2)
Transient Thermo-hydraulic Report
27 Terrain slugging1)
28 Shut-down of pipeline
29 Pressure surges/water hammer
30 Cool-down time at shut-down
31 Liquid hold-up during shut-down
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
I
I
I
I
R1
R1
R1
R1
R1
R1
R1
R1
I
I
R1
I
I
R1
R1
R1
R1
R1
R1
R1
I
I
R1
I
R1
R1
R1
I
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R2
R1
R2
R2
R1
R1
R2
R2
R1
R1
R1
R1
I
R1
R1
R1
R1
R1
R1
R1
R2
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R1
R2
R1
R1
R2
R1
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 46
Table D-4 Flow assurance design (Continued)
Item
Description
32
Initial and warm start-up of pipeline
Flowrate variation (ramp up and ramp down), packing and
unpacking, blowdown)
Heating of pipeline
Liquid surging at transient operation
High integrity pressure protection system (HIPPS) or Pipeline Safety
System
Update of Steady State Report and Transient Report based As-laid
Survey.
33
34
35
36
37
Low
R1
Level of involvement
Medium
High
R1
R1
R1
R1
R1
R1
R1
R1
R1
R2
R1
R1
R1
R1
I
R1
R2
Notes:
1) Applicable for multiphase pipelines
2) Applicable for gas pipelines
Table D-5 Independent analyses/calculations for flow assurance
Item
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
Activity
Description
Checking of input values, program system used and
brief assessment of results
Capacity/
Simple calculations based on empirical formulae/
pipe
spread-sheet models
dimension
Independent calculations with appropriate multi-phase
program
Checking of input values, program system used and
Pressure/
brief
assessment of results
temperature
Simple calculations based on empirical formulae/
profiles
spread-sheet models
Anode
Independent calculations with appropriate multi-phase
temperature program system
Checking of input values, program system used and
Hydrate/ wax brief assessment of results
analysis
Independent calculations with appropriate process
simulation and multi-phase program systems
Insulation Checking of input values, program system used and
brief assessment of results
system
Simple calculations based on empirical formulae/
Over-all
spread-sheet models
U-value,
Independent calculations with appropriate multi-phase
Effect of
trenching program
Corrosion
assessment
Erosion
assessment
Piping
system,
chokes
Sand
accumulation
Transient
analysis
Low
x
Level of involvement
Medium
High
x
x
x
x
x
x
x
x
x
x
x
x
x
x
x
(x)
x
x
x
x
x
(x)
x
Independent calculations with appropriate multi-phase
program
(x)
Independent calculations with appropriate program
system
(x)
Independent calculations with appropriate multi-phase
program
Checking of input values, program system used and
brief assessment of results
Start up, shut
down, flow Independent calculations with appropriate transient
rate variation, multi-phase program system
packing,
blowdown
DET NORSKE VERITAS AS
(x)
x
x
x
(x)
x
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 47
Table D-5 Independent analyses/calculations for flow assurance (Continued)
Activity
17
Transient
analysis
Independent calculations with appropriate transient
multi-phase program system
(x)
x
18
Cool-down,
heating
Transient
analysis
Independent calculations with appropriate transient
multi-phase program system
(x)
x
(x)
x
19
20
21
Pressure
surges,
HIPPS
Transient
analysis
Description
Level of involvement
Medium
High
Item
Checking of input values, program system used and
brief assessment of results
Low
(x)
Independent calculations with appropriate transient
multi-phase program system
Checking of input values, program system used and
brief assessment of results
(x)
x
x
x
Terrain
slugging,
Independent calculations with appropriate transient
22
(x)
x
liquid
multi-phase program system
hold-up,
liquid surges
x = analysis/check should be included in the scope of work (if relevant)
(x) = analysis/check should be included in the scope of work if the issue is identified as critical or highly utilised. Then
final decision of inclusion in the scope of work shall be a result of the document review of simple analysis.
D.5 Construction
D.5.1 General
D.5.1.1 Construction consists of a number of different site activities and their associated documentation.
D.5.1.2 Table D-6 and Table D-7 give summaries of the scope of work tables included in this section for
various construction activities.
D.5.1.3 For construction, verification lists similar to those shown hereafter shall be made for the specifics of
the particular project.
D.5.2 Construction verification
D.5.2.1 DNV-OS-F101 Sec.12 C100-300 and D100-200 specifies the documentation to be submitted before,
during and after construction.
D.5.2.2 For verification of pipeline systems construction activities are considered as:
— initial activities
— inspection activities
— final activities.
D.5.2.3 The initial activities include the review of procedures, attendance during qualification of procedures
(e.g. MPQT, WPQT) and personnel (e.g. welders) and other start-up activities. The inspection activities are the
site or vessel attendance and the final activities are the (continuous) review of production results/records and
the completion of documentation and reports.
D.5.3 Low level construction verification involvement
D.5.3.1 For Low level verification involvement, the procedure review consists of a review of the construction
management procedures and confirmation that the most important aspects of the main specifications have been
included in the procedures. For the qualification of procedures and personnel DNV will not attend the actual
qualification, but shall review the results.
D.5.3.2 During the construction, DNV’s verification will be performed during site or vessel visits. The
verification shall focus on the critical items/aspects identified in the detailed scope of work tables.
D.5.3.3 The subsequent verification of the final activities should be by spot-checks of the production records
including nonconformity logs, and results from audits, both contractors internal audits or audits performed by
other parties.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 48
D.5.4 Medium level construction verification involvement
D.5.4.1 For Medium level verification involvement, the procedure review consists of a detailed review of
construction management procedures. Other procedures and analysis documents shall be spot checked to
confirm that the most important aspects of the specifications have been included.
D.5.4.2 For the qualification of procedures and personnel DNV shall visit the main qualifications and review
the results.
D.5.4.3 During construction, DNV’s verification shall be performed by attendance at the main sites or vessels,
normally limited to one shift per day. The verification should focus on the critical items/aspects as identified
in the detailed scope of work tables.
D.5.4.4 Verification of the final activities shall be by review of the production records including
nonconformity logs, and results from audits, both contractor’s internal audits or audits performed by other
parties, from the main sites and spot checks of the same from other important sites.
D.5.5 High level construction verification involvement
D.5.5.1 For High level verification involvement, the procedure review consists of a detailed review of
construction management procedures. Other procedures and analysis documents, if relevant, shall be checked
to confirm that important aspects of the specifications have been included.
D.5.5.2 For qualification of procedures and personnel DNV shall attend the main qualifications, visit other
qualifications and review the results.
D.5.5.3 During construction, DNV’s verification shall be performed by full time (all shifts) attendance at the
main sites or vessels and by visits to the other important sites. Verification should focus on the critical items/
aspects as identified in the detailed scope of work tables.
D.5.5.4 Verification of the final activities shall be by review of the production records including the
nonconformity logs, and results from audits, both contractors internal audits or audits performed by other
parties, from the main sites and spot checks of the same from other important sites.
D.5.6 Verification of work in progress
D.5.6.1 The monitoring by the owner during construction typically relates to the activities of the contractor.
The monitoring of these activities by DNV relates not only to the contractor’s activities but also to the
monitoring of these activities carried out by the owner.
D.5.6.2 The emphasis placed on the various activities in the verification plan varies depending on:
—
—
—
—
any areas of concern revealed during design verification
any areas of concern revealed during the audit of the owner’s or contractor’s quality management systems
the progress of construction
the findings of the contractor surveillance personnel.
D.5.6.3 Many contractors have adequate quality control systems and quality control departments, with
competent personnel to perform, for example, inspection at mills and coating plants and specialist material
engineers competent to review and verify the performance of mills. In that case, not all verification work needs
be done by DNV personnel. Where applicable, the various inspections may be carried out by competent persons
other than DNV personnel. In that situation DNV’s verification activities can be confined to:
— reviewing the competence of the contractor’s personnel
— auditing their working methods and their performance of that work
— reviewing the documents produced by them.
D.5.6.4 DNV personnel shall focus on areas where problems have occurred, or are considered likely to occur.
Conversely, less effort is spent in areas where the likelihood of problems is considered lower.
D.5.7 DNV final verification report
D.5.7.1 The scope of work tables for construction normally include a last item entitled “Issue of DNV closeout report”. This item is not related to the production process, but intended as a reminder to the DNV (or others)
inspection personnel that a final report of their verification activities is required to finish the work.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 49
D.5.8 Detailed scope of work for construction
Table D-6 Construction summary table - fabrication
Table no.
D-8
D-9
D-10
D-11
D-12
D-13
D-14
D-15
D-16
Table description
Steel making
Plate rolling
Linepipe production
Buckle arrestor fabrication
Coating application (external)
Isolating joint fabrication
Valves
Fabrication of pressure containing components, e.g. bends, Tees, pig-traps
Fabrication of non-pressure containing components e.g. anodes, concrete coating
Table D-7 Construction summary table - installation
Table no.
D-17
D-18
D-19
D-20
D-21
D-22
D-23
D-24
D-25
Table description
Surveys; Pre-installation, As-laid, As-built
Qualification of lay barge, marine spread and installation equipment
Qualification of welding, NDT, field joint coating, procedures and personnel
Pipe storage yard
Fabrication of temporary equipment, e.g. A&R heads, pulling heads, test heads
Pipeline installation, incl. onshore pipe jointing and stalk welding as applicable
Seabed intervention and pipeline protection
Pre-commissioning
Pipeline control and safety system
Table D-8 Steel making
Item
Description
Initial activities
1 Quality management system documents.
system audit / attend owner’s audit, at relevant
2 Quality
manufacturers and sub-suppliers.
3 Specifications and procedures.
4 Attend kick-off meeting / Initial technical meetings.
5 Verify performance and testing during qualifications.
Inspection activities
6 Steel making and slab casting.
7 Slab inspection macro, non-metallic inclusion verification.
8 Slab identifications heat number.
9 Chemical analysis (ladle).
Low
Level of involvement
Medium
High
-
R1
R2
-
-
A
R1
X
-
R2
X
X
R2
X
X
S1
-
S1
S1
S1
S1
S1
S1
S1
S1
Table D-9 Plate rolling
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit at relevant manufacturers
and sub-suppliers
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting
5 Verify performance and testing during qualifications
6 Technical meetings
DET NORSKE VERITAS AS
Level of involvement
Low
Medium
High
-
R1
R2
-
-
A
R1
X
-
R2
X
X
S1
R2
X
X
S1
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 50
Table D-9 Plate rolling (Continued)
Item
Description
Inspection activities
7 Slab re-heating, rolling and accelerated cooling processes
Automatic ultrasonic inspection
8 Calibration of equipment
9 Visual inspection
10 Identification of test coupons
11 Loading and handling
Final activities
Review of steel making and plate rolling manufacturing and testing
11
records
12 Issue of DNV close-out report
Low
Level of involvement
Medium
High
S1
S2
S3
S1
S2
S3
S1
S1
-
S2
S2
S1
S3
S3
S1
R1
R2
R2
X
X
X
Table D-10 Linepipe production
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit at relevant manufacturers
and sub-suppliers.
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting
5 Verify performance and testing during qualifications
6 Technical meetings
Inspection activities
7 Material identification (pipe list) and tracking
8 Check pipe-forming and bevel
9 Welding and consumable handling
10 Weld repairs
11 View and interpret X-rays of repairs
12 Expanding, review record of expansion ratio
13 Check calibration of gauge
14 Hydrostatic test
15 End facing and squareness
16 View and interpret X-rays of pipe ends
17 Calibration of UT equipment
18 Automatic ultrasonic on pipe (longitudinal and transverse)
19 MPI - Equipment and sensitivity check
20 MPI - For pipe ends
21 MPI - After repair of pipe body by grinding
22 Dye penetrant - Check procedures
23 Dye penetrant - For pipe ends
24 Dye penetrant - After repair of pipe body by grinding
25 Wall thickness measurement after repair by grinding
26 Ultrasonic of pipe ends - Calibration of equipment
Ultrasonic of pipe ends - Ultrasonic inspection of pipe-end
27
(circumference). Both 90 ° and angle probes shall be used.
28 Dimensional inspection
29 Visual external inspection, including cleanliness of inside pipe body
30 Weighing of pipe
31 Bevel protectors (if required)
Marking - Check tracking records, Die stamp weld bevel, Paint mark
32 internal, Colour code external
33 Storage of finished pipes
DET NORSKE VERITAS AS
Level of involvement
Low
Medium
High
R1
R1
R2
-
-
A
R1
X
-
R2
X
X
S1
R2
X
X
S1
S1
S1
S1
S1
R1
S1
S1
R1
S1
R1
S1
S1
R1
S1
S1
S1
R1
S2
S2
S2
S1
S2
S1
R2
S2
S1
S2
R2
S2
R2
S2
S2
R2
S2
S2
S2
R2
S3
S2
S2
S2
S3
S2
R2
S3
S1
S3
R2
S3
R2
S3
S3
R2
S3
S3
S3
R2
S1
S2
S3
S1
S1
-
S2
S2
S1
S1
S3
S3
S1
S1
S1
S2
S3
-
S1
S2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 51
Table D-10 Linepipe production (Continued)
Item
Description
34 Cutting and identification of test coupons
35 Mechanical testing of production test pieces
36 Check material certificates
Final activities
37 Review of manufacturing and testing records
38 Issue of DNV close-out report
Low
S1
S1
R1
R1
X
Level of involvement
Medium
High
S1
S2
S1
S2
R2
R2
R2
X
R2
X
Note:
This table defines the scope of work for the verification of longitudinally welded linepipe production. However, it may be used for
seamless linepipe production by omitting all items related to the welding of the longitudinal seam.
Table D-11 Buckle arrestor fabrication
Item
Description
Initial activities
1 Quality management system documents
Quality system audit / attend owner’s audit, at relevant
2 manufacturers and sub-suppliers
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting
5 Verify performance and testing during qualifications
6 Technical meetings
Inspection activities
7 Material identification (Pipe list)
8 Check pipe- forming (forging), heat treatment (Q/T) and machining
9 Welding and consumable handling
9 Welding of pup-pieces (if required)
10 NDT
11 Check calibration of gauge
12 Hydrostatic test
13 Dimensional inspection as per specification.
14 Visual external inspection, including cleanliness of inside pipe body
15 Weighing of buckle arrestors
16 Bevel protectors (if required)
17 Marking - Check tracking records, Die stamp weld bevel, Paint mark
internal, Colour code external
18 Storage of finished buckle arrestors
19 Removal and identification of test coupons
20 Mechanical testing of production test pieces
21 Check material certificates
22 Loading and handling
Final activities
23 Review of manufacturing and testing Records
24 Issue of DNV close-out report
Low
Level of involvement
Medium
High
R1
R1
R2
-
-
A
R1
X
-
R2
X
X
S1
R2
X
X
S1
R1
S1
S1
S1
R1
S1
S1
S1
-
R2
S2
S1
S1
S2
R2
S2
S2
S2
S1
S1
R2
S2
S2
S2
S3
R2
S3
S3
S3
S1
S1
-
S1
S2
S1
S1
R1
-
S1
S2
S1
R2
S1
S2
S3
S2
R2
S2
R1
X
R2
X
R2
X
Table D-12 Coating application (external1)
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit,at relevant manufacturers
and sub-suppliers
3 Specifications and procedures
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
R1
R1
R2
-
-
A
R1
R2
R2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 52
Table D-12 Coating application (external1) (Continued)
Item
Description
4 Attend kick-off meeting / Initial technical meeting
5 Verify performance and testing during qualifications
6 Technical meetings
Inspection activities
7 Testing of coating materials
8 Examination of pipe prior to surface preparation
9 Examination of grit
Pre-treatment - temperature, steel temperature humidity during pre10
treatment, surface condition
Visual inspection after blast-cleaning for cleaning standard,
roughness, surface imperfections, contamination as dust and
11 chlorides, cleanliness, segregation, repair and re-instalment of
rejected pipes
Coating application - temperature, steel temperature humidity during
12
painting application, surface condition
13 Curing conditions
14 Paint thickness measurements
15 Final inspection and marking of coated pipes
16 Coating repair
17 Storage and handling of coated pipes
Final activities
18 Review of fabrication and testing records
19 Review of testing records
20 Issue of DNV close-out report
Low
X
-
Level of involvement
Medium
High
X
X
X
X
S1
S1
R1
S1
-
R2
S2
S1
R2
S3
S1
S1
S1
S2
S1
S2
S3
S1
S2
S3
S1
S1
S1
-
S1
S2
S2
S2
S1
S1
S3
S3
S3
S2
R1
R1
X
R2
R2
X
R2
R2
X
Note:
1)
As internal coating and concrete coating do not affect the integrity of the pipe, the follow up should be limited to visit based (S1).
Concrete coating is covered by Table D-16
Table D-13 Isolation joint fabrication
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit,at relevant manufacturers
and sub-suppliers
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting
5 Verify performance and testing during qualifications
6 Technical meetings
Inspection activities
Verify chemical composition for carbon steel to ensure sufficient
7 hardenability
8 Forging and heat treatment
9 Machining
10 Welding and consumable handling
11 NDT
12 Check calibration of gauge
13 Hydrostatic test
14 Hydraulic fatigue testing
15 Electrical resistant test
16 Dielectric strength test
17 Visual inspection
18 Dimensional inspection as per specification
DET NORSKE VERITAS AS
Level of involvement
Low
Medium
High
R1
R1
R2
-
-
A
R1
X
-
R2
X
X
S1
R2
X
X
S1
R1
R2
R2
-
S1
S1
S1
S1
R2
S1
S1
S1
S1
S1
S1
S2
S2
S2
S2
R2
S3
S2
S2
S2
S2
S2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 53
Table D-13 Isolation joint fabrication (Continued)
Item
Description
19 Weighing of insulating joints
20 Marking
21 Storage of finished insulating joints
22 Removal and identification of test coupons
23 Mechanical testing of production test specimen
24 Check material certificates
25 Insulating joint conservation and storage
Final activities
26 Review of fabrication records and testing records
27 Issue of DNV Close-out report
Low
R1
R1
X
Level of involvement
Medium
High
S1
S2
S1
S2
S1
S2
S1
S2
S1
S2
R2
R2
S1
S2
R2
X
R2
X
Table D-14 Valve fabrication (applies to all pressure containing parts)
Item
Description
Initial activities
1 Quality management system documents
Quality system audit/attend Owner’s audit at relevant manufacturers
2 and sub-suppliers
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting
5 Verify performance and testing during qualification
6 Technical meetings
Inspection activities
7 Verify chemical composition for carbon steel to ensure sufficient
hardenability
8 Forging/casting and heat treatment
9 Removal and identification of test coupons
10 Mechanical testing of production test specimen
11 Machining
12 Welding and consumable handling
13 NDT
14 Hydrostatic test (including check calibration of gauges)
15 Visual inspection
16 Dimensional inspection
17 Weighing of valve
18 Marking
19 Factory acceptance test (FAT)
20 Check material certificates
21 Valve conservation and storage
Final activities
22 Review of fabrication records and testing records
23 Issue of DNV Close-out report
Low
Level of involvement
Medium
High
R1
R1
R2
-
-
A
R1
X
-
R2
X
X
S1
R2
X
X
S1
R1
R2
R2
S1
S1
S1
R1
-
S1
S1
S1
S1
S1
S1
S1
S1
S1
S1
S1
S1
R2
S1
S2
S2
S2
S1
S2
S2
S2
S2
S2
S2
S2
S2
R2
S2
R1
X
R2
X
R2
X
Table D-15 Fabrication of other pressure containing components, e.g. bends, tees, pig-traps
Item
Level of involvement
Low
Medium
High
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend Owner’s audit,at relevant manufacturers
and sub-suppliers.
3 Specifications and procedures
DET NORSKE VERITAS AS
R1
R1
R2
-
-
A
R1
R2
R2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 54
Table D-15 Fabrication of other pressure containing components, e.g. bends, tees, pig-traps
(Continued)
Item
Description
4 Attend kick-off meeting / Initial technical meeting
5 Verify performance and testing during qualifications
6 Technical meetings
Inspection activities
7 Verify chemical composition for carbon steel to ensure sufficient
hardenability
8 Check forming (forging), heat treatment (Q/T) and machining
9 Welding and consumable handling
10 NDT
11 Check calibration of gauge
12 Hydrostatic test
13 Dimensional inspection as per specification
14 Visual external inspection, including cleanliness of inside pipe body
15 Weighing of final product
16 Bevel protectors (if required)
Marking - Check tracking records, Dye stamp weld bevel, Paint mark
17 internal, colour code external etc.
18 Storage of final product
19 Cutting and identification of test coupons
20 Mechanical testing of production test specimen
21 Check material certificates
Final activities
22 Review of fabrication and testing records
23 Issue of DNV close-out report
Level of involvement
Low
Medium
High
X
X
X
X
X
S1
S1
R1
R2
R2
-
S2
S1
S2
R2
S2
S2
S2
S1
S1
S2
S2
S2
R2
S2
S3
S2
S1
S1
-
S1
S1
S1
S1
R1
S1
S1
S1
R2
S1
S3
S3
R2
R1
-
R2
X
R2
X
Table D-16 Fabrication of non-pressure containing components, e.g. anodes, concrete coating
Item
Description
Initial activities
1 Quality management system documents
system audit / attend owner’s audit, at relevant manufacturers
2 Quality
and sub-suppliers
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting.
5 Verify performance and testing during qualifications
6 Technical meetings
Inspection activities
Verify chemical composition for carbon steel to ensure sufficient
7 hardenability (if relevant)
8 Welding and consumable handling, if applicable
9 NDT, if applicable
10 Dimensional inspection
11 Visual inspection,
12 Weighing of final product
13 Bevel protectors (if required)
Marking - Check tracking records, Dye stamp weld bevel, Paint mark
14 internal, colour code external etc.
15 Storage of final product
16 Cutting and identification of test coupons
17 Mechanical testing
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
-
R1
R1
-
-
A
-
R2
X
X
S1
R2
X
X
S1
-
R2
R2
-
S1
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
S2
-
S1
S2
-
S1
S1
S1
S2
S2
S2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 55
Table D-16 Fabrication of non-pressure containing components, e.g. anodes, concrete coating
(Continued)
Item
Description
18 Check material certificates
Final activities
19 Review of fabrication and testing records
20 Issue of DNV close-out report
Level of involvement
Low
Medium
High
S1
S2
R1
-
R2
X
R2
X
Table D-17 Surveys; pre-installation, as-laid, as-built
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting.
5 Verify performance and testing during qualifications
Inspection activities
6 Pre-installation survey:
— Attend survey
— Review of survey reports
7 As-laid survey:
— Touch Down Monitoring (via installation vessel)
— Attend survey
— Review of survey reports
8 As-built survey:
— Attend survey
— Review of survey reports
Final activities
9 Issue of DNV close-out report
Low
Level of involvement
Medium
High
I
-
I
R1
-
R1
A
R2
X
X
R1
R1
S1
R2
R1
S2
R1
S2
S1
R2
R1
R1
S1
R2
-
-
X
Table D-18 Qualification of lay barge, marine spread and installation equipment
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend Owner’s audit
3 Review of specifications and procedures
4 Attend kick-off meeting / Initial technical meeting
Inspection activities
5 DP Systems (Equipment Class II and III)
6 Anchoring System
Combined DP / anchoring system - tensioner tests (Pull-Stop):
7 — simulate barge pull and tensioner failures
— miscellaneous other redundancy testing during barge pull
Tension system test/ calibration:
— calibration
testing of combinations of tensioner testing of single tension
— failures when running two or three tensioners
8
testing redundancy for single tensioners (brakes, tension motors,
— squeeze pressure system)
— simulate main power loss
— simulate loss of signal power
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
R1
-
R1
R2
X
R2
A
R2
X
-
R1
S2
S1
S2
-
S2
S2
S2
S2
R1
-
S2
S2
S2
S2
-
S2
S2
-
S2
S2
S2
S2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 56
Table D-18 Qualification of lay barge, marine spread and installation equipment (Continued)
Item
Description
Abandonment and retrieval winch test/calibration:
— calibration
9 — simulate to test fail safe action
— simulate main power loss
— simulate loss of signal power
Test of friction clamps:
10 — test fail safe actions
— test clamps during barge pull
11 Test of remote operated buckle detector
12 Calibration of measuring devices used for configuration control
13 Stinger configuration and control devices
14 Maintenance records of critical/essential equipment
Final activities
15 Review of reports and documentation
16 Issue of DNV close-out report
Low
Level of involvement
Medium
High
R1
-
S2
S2
S2
S2
S2
S2
S2
S2
R1
R1
-
S2
S2
S2
S2
S2
R1
S2
S2
S2
S2
S2
R2
R1
-
R2
X
R2
X
Table D-19 Qualification of welding, NDT, field joint coating, procedures and personnel
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit
3 Specifications and procedures
4 Attend kick-off meeting / Initial technical meeting
Inspection activities
Qualification of welding procedure (including repair):
— pWPS, WPQR, WPS
— welding equipment type and identification
— base material identification and certificates
— bevelling and bevel shape
— line-up and fit-up
— excavation and grinding of repair welds
5
welding consumables identification and certificates, re-cycling
— of welding flux, mixture of new and re-cycled welding flux
— preheat and interpass temperatures
— recording and control of welding parameters
— NDT of test welds
— removal and identification of test pieces
— mechanical testing
Welding consumable batch qualification:
— bevelling and bevel shape
— welding consumables identification and certificates
— re-cycling of welding flux, mixture of new and re-cycled
welding flux
6
— preheat and interpass temperatures
— control of welding parameters
— removal and identification of test pieces
— mechanical testing
Review of NDT procedures:
— final AUT procedure
7
— manual UT procedures
— MPI procedures
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
R1
-
R1
R2
X
R2
A
R2
X
R1
R1
-
R2
S1
R2
S1
S1
S1
S1
R2
S2
R2
S2
S2
S2
S2
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
S2
S2
S2
R1
-
S1
R2
S1
S2
R2
S2
S1
S1
S1
S1
S2
S2
S2
S2
S2
S2
R1
R1
R1
R2
R2
R2
R2
R2
R2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 57
Table D-19 Qualification of welding, NDT, field joint coating, procedures and personnel (Continued)
Item
Description
AUT equipment qualification:
— qualification programme
— detailed system description and operation manual
— AUT procedure and reporting levels proposed for the
qualification programme
— sound velocity measurements (material from all plate mills)
— calibration block(s) dimensions and tolerances
8
— welding of test welds with defects and RT/UT to confirm
presence of defects
— scanning of SAW, GMAW and repair test welds
— AUT report and selection of areas to be sectioned
— sectioning and defect height/length/location determination
— statistical treatment of data and the defect sizing error
determined
— proposed threshold levels
Qualification of field joint coating procedures:
— procedure
— identification of materials
9
— surface preparation, temperature check
— application of coating
— testing of coating
Qualification of external coating repair procedure:
— procedure
— identification of materials
10
— surface preparation, temperature check
— application of coating
— testing of coating repair
Qualification of internal coating repair procedure:
— procedure
— identification of materials
11
— surface preparation, temperature check
— application of coating
— testing of coating repair
12 Welders’ qualification/certification records
13 Welding inspectors’ qualification/certification records
14 NDT operators’ qualification/ certification records
15 Coating inspectors’ qualification/certification records
Final activities
16 Review of reports and documentation
17 Issue of DNV close-out report
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
R1
R1
-
R2
R2
S1
R2
R2
S2
-
S1
S1
S1
S2
S2
S2
R1
R1
S1
S1
R2
R2
S2
S2
R2
R2
R1
R2
R2
R1
R1
R2
S1
S1
S1
S2
R2
S2
S2
S2
S2
R1
R1
R2
S1
S1
S1
S2
R2
S2
S2
S2
S2
R1
R1
R1
R1
R1
R1
R2
S1
S1
S1
S2
R2
R2
R2
R2
R2
S2
S2
S2
S2
R2
R2
R2
R2
R1
X
R2
X
R2
X
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 58
Table D-20 Pipe storage yard
Item
Description
Initial activities
1 Specifications and procedures
2 Attend kick-off meeting / Initial technical meeting
Inspection activities
Inspection of pipes and key products at assembly yards before load
out for transportation:
— pipe stacking heights in accordance with specification
— pipe ends for damage and end protectors
6 — condition of coating, degradation and damage
— pipe identification legible, complete and correct
— marking and proper segregation/quarantine of rejected pipe
— “repaired pipe” and “rejected pipe” records
— internal cleanliness of pipe during storage and prior to shipping
Pipe tracking system:
7 — Implementation of pipe tracking system
— Spot check on recording correctness
8 Receiving inspection of pipe returned from offshore:
9 Storage of repairable pipe in segregated area:
Repair of repairable pipe:
— repair according to accepted procedures
10
— acceptability of repair
— check of status for repaired pipe in the pipe tracking system
Final activities
11 Review of reports and documentation
12 Issue of DNV visit report
Low
Level of involvement
Medium
High
I
-
R1
-
R2
X
R1
-
S1
S1
S1
S1
S1
R2
S1
S1
S1
S1
S1
S1
R2
S1
-
S1
S1
S1
S1
S1
S1
S1
S1
-
S1
S1
-
S1
S1
R2
-
R1
X
R2
X
Table D-21 Fabrication of temporary equipment, e.g. A&R heads, pulling heads, test heads
Item
Description
Initial activities
1 Specifications and procedures
2 Attend kick-off meeting / Initial technical meeting.
Inspection activities
Fabrication of temporary equipment:
— material and component certificates
— welding procedure qualification record (WPQR), WPS
— welder qualification
— machining
3
— welding and consumable handling
— NDT
— visual and dimensional inspection as per specification
— testing
— marking
Final activities
4 Review of reports and documentation
5 Issue of DNV visit report
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
R1
-
R1
-
R2
X
-
R1
R1
R1
S1
S1
R1
S1
S1
S1
R2
R2
R2
S2
S2
R2
S2
S2
S2
R1
-
R1
X
R2
X
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 59
Table D-22 Pipeline installation, incl. onshore pipeline jointing and stalk welding as applicable
Item
Description
Initial activities
1 Quality management system documents
2
Quality system audit / attend owner’s audit
Installation engineering documents, specifications and procedures, as
applicable:
— Analysis design brief documents
— Static pipelay analysis
— Dynamic pipelay analysis
— Abandonment and recovery analysis
— Vessel positioning / mooring analysis
— Shore pull analysis
— ECA (engineering critical assessment)
— Welding repair analysis
3
— Pipe pull analysis
— Pipe stacking analysis
— Welding procedures
— NDT procedures
— Field joint coating procedures
procedures; start up, normal lay, abandonment and
— Installation
recovery, lay down, shore pull
— Failure Mode Effect Analysis (FMEA) and HAZOP studies
— Contingency procedures
— ITP (inspection and test plan)
4 HAZID-, HAZOP-meetings
5 Kick-off meeting onboard installation vessel, at site
Inspection activities
5 All major equipment tested, qualified and ready for use
6 All procedures approved and available
7 Valid certification for welding, inspection and NDT personnel
8 Pipe tracking system – recording of data
Pipe unloading, receiving inspection and storage:
— pipe identification legible, complete and correct
conditions of pipes acceptable according to specification, pipe
— ends undamaged and end protectors in place, coating without
degradation and damage.
9
— identification, marking, segregation and return onshore of
rejected pipes
— pipe stacking heights in accordance with specification
— certification, documentation and status of pipes in contractor’s
tracking system
Receipt of welding consumables and key products:
— condition acceptable according to specification, packaging
undamaged
10
— identification and certification of welding consumables
— storage conditions for welding consumables
Repairs of damage to external and internal coating
11
— correct repair
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
I
R1
R2
-
A
A
R1
I
I
I
I
I
I
I
I
I
I
I
I
R2
R1
R1
R1
R1
R1
R1
R1
R1
R1
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R2
R1
R2
R2
I
I
I
-
R1
R2
R2
X
X
R2
R2
R2
X
X
R1
R1
R1
-
R2
R2
R2
S1
R2
R2
R2
S1
-
S1
S2
-
S1
S2
-
S1
S2
-
S1
S2
-
S1
S2
-
S1
S2
S1
S1
S1
S1
S2
S2
R1
S1
S2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 60
Table D-22 Pipeline installation, incl. onshore pipeline jointing and stalk welding as applicable
(Continued)
Item
Description
Bevelling, cleaning, line-up and welding at welding stations:
— bevelling and bevel shape
— internal cleaning
— line-up and fit-up
12
— welding consumables identification, re-cycling of welding flux,
mixture of new and re-cycled welding flux
— welding procedures, control of welding parameters
— sequence of anode pipe and buckle arrestors
— pipe tracking system entries
Non-destructive testing:
— equipment calibration
— scanning
13
— interpretation of indications
— documentation filing
— equipment maintenance
Excavation, welding and NDT of repairs:
— excavation length and depth, grinding
— NDT of excavation
14
— welding consumables identification
— welding procedures, control of welding parameters
— NDT of repairs
Production tests:
— welding of production tests
15
— NDT of production tests
— marking and shipping
Field joint coating:
16 — material and procedure
— testing of field joint coating
Pipelaying activities
19 Monitoring and recording of laying parameters:
— vessel position
— DP system operation
— anchor pattern
— pull speed
— Tension, settings including dead band
— roller loads
— vessel trim and draft
— ramp configuration
— water depth
— pipeline catenary configuration
touch down point monitoring; within route, curves,free spans,
— pipe supports, crossings, etc.
— buckle detection
— operating limit condition parameters
Abandonment and recovery operations:
— removal of internal equipment
20 — welding of A&R head
— winch tension and wire length
— inspection of pipeline prior to resuming laying
DET NORSKE VERITAS AS
Level of involvement
Low
Medium
High
-
S1
S1
S1
S2
S2
S2
S1
S1
S2
S1
-
S1
S1
-
S2
S2
S1
S1
S1
S1
-
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
S1
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
R1
R1
-
S1
S1
S1
S2
S2
S2
-
S1
S1
S2
S2
S1
S1
-
S1
S1
S1
S1
S1
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
S2
S2
S2
S2
S2
S1
S1
S2
-
S1
S1
S2
S2
-
S1
S1
S1
S1
S2
S2
S2
S2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 61
Table D-22 Pipeline installation, incl. onshore pipeline jointing and stalk welding as applicable
(Continued)
Item
Description
Shore pull:
— verify adequate seabed preparation
— installation of pulling head
21 — pulling force
— tension and wire length
— twisting
— ROV monitoring
Tie-in operations:
— pre tie-in survey of seabed
— winch tension and wire length during lifting and lowering
— line-up and fit-up
22
— welding, consumables identification, welding procedures,
control of welding parameters
— Inspection, NDT
— field joint coating
— ROV survey on both sides of tie-in after lowering
Final activities:
23 Review of reports and documentation
24 Issue of DNV close-out report
Level of involvement
Low
Medium
High
-
S1
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
S2
-
S1
S1
S1
S2
S2
S2
-
S1
S2
-
S1
S1
S1
S2
S2
S2
R1
X
R2
X
R2
X
Table D-23 Seabed intervention and pipeline protection
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit
3 Specifications and procedures
4 Attend Kick-off meeting / Technical meeting / HAZOP meeting
Inspection activities
5 Rock installation:
— Rock installation schedule
— Rock grading check
— Rock installation operations
— Pre- and post-installation surveys
6 Trenching:
— Trenching equipment monitoring system calibration
— Trenching trials, test trench
— Trenching operation parameters
— Operations monitoring
— Post trench survey
7 Other intervention work; grout bags, concrete mattresses, boulder
removal, dredging, etc.:
— Equipment. function testing, lifting certificates
— Operations monitoring
— Pre- and post-operation surveys
Final activities
8 Review of reports and documentation
9 Issue of DNV visit report
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
R1
-
I
R1
X
R1
A
R2
X
R1
-
R1
S1
S1
S1
R2
S1
S1
S1
-
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
-
-
S1
S1
S1
R1
-
R2
X
R2
X
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 62
Table D-24 Pre-commissioning
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit
3 Specifications and procedures
4 Attend Kick-off meeting / Technical meeting / HAZOP meeting
Inspection activities
Flooding, cleaning and gauging operations:
— Water sampling
— Inhibitor injection
5 — Pumping pressure and volume
— Gauge plate dimensional check
— Calliper pigging, if applicable
— Debris assessment
System pressure test:
— Instrumentation and equipment calibration certificates
— Pressurisation, pressure and temperatures log
6
— Air content measurements
— Pressure test / holding period
— Depressurisation
Dewatering and drying:
7 — Dewater pigging
— Drying, if applicable
Final activities
8 Review of reports and documentation
9 Issue of DNV close-out report
Low
Level of involvement
Medium
High
R1
-
I
R2
X
R
A
R2
X
R1
-
S1
S1
S1
S1
S1
S1
S2
S2
S2
S2
S2
S2
R1
-
R2
S1
S1
S1
S1
R2
S2
S2
S2
S1
-
-
S1
S1
R1
-
R2
X
R2
X
Table D-25 Pipeline control and safety systems
Item
Description
Initial activities
1 Detailed Design Specification and Module Design Specifications
2 Verification test plans
3 FAT plans (if applicable)
4 Site validation plans
5 Proof tests plans
6 Functional Safety Management Plan for Operations and Maintenance
Inspection activities
7 Witnessing of verification tests
8 Witnessing of FAT (if applicable)
9 Witnessing of site validation tests
10 Witnessing of proof tests
Final activities
11 Review of reports and documentation
12 Issue of DNV close-out report
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
I
I
I
I
I
R1
R1
R1
R1
R1
R1
R1
R2
R2
R2
R2
R2
R2
S1
S1
S3
S1
S3
S3
S3
S3
S3
S3
S3
R1
-
R2
X
R2
X
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 63
D.6 Operation
D.6.1 General
D.6.1.1 Verification during operation is carried out by means of:
— audits
— reviews
— site visits.
D.6.2 Verification in operation
D.6.2.1 The documentation to be produced and issues to be covered during operation are given in DNV-OSF101 Sec.12 E100, F100 and F200.
D.6.2.2 The document register shall be made available to DNV for identification of documents for submission
for review.
D.6.2.3 For retention of pipeline certificate, the main activities and timing within a five (5) year cycle consist
of regular follow-up, yearly assessments and 5 yearly update of pipeline certificate.
D.6.2.4 Table D-26 describes the issues to be verified and Table D-27 to Table D-32 identify the extent of
DNV involvement included in the three levels of verification involvement.
D.6.2.5 Recommended practice for integrity management of submarine pipeline systems is given in DNV-RPF116.
D.6.3 Low level of verification involvement during operation
D.6.3.1 Low level verification involvement consists of general review of the main document(s) to check
compliance with design documentation.
D.6.3.2 Audit during repair and modification.
D.6.4 Medium level of verification involvement during operation
D.6.4.1 Medium level verification involvement consists of detailed review of the main document(s) to check
compliance with design documentation.
D.6.4.2 Audit attendance during commissioning, start-up of periodical survey, modification and repair
activities. For critical aspects, as identified by the requirement for maintenance of certificate, audit attendance
throughout the activities. Review of contractors' documentation of any survey/modification.
D.6.4.3 Audit attendance during normal operation. Spot check of operational records and assessments.
D.6.5 High level of verification involvement during operation
D.6.5.1 High level verification involvement consists of detailed review of the main document(s) to check
compliance with design documentation.
D.6.5.2 Audit attendance during commissioning, start-up of periodical survey, modification and repair
activities. For critical aspects, as identified by the requirement for maintenance of certificate, audit attendance
throughout the activities. Review of contractors' documentation of any survey/modification.
D.6.5.3 Audit attendance during normal operation. Detailed review of operational records and assessments.
D.6.5.4 Review of the main document(s) to check compliance with applicable codes and standards. Audit
attendance during start-up and performance of periodical survey, modification and repair activities. For critical
aspects, as identified by the requirement for maintenance of certificate, full attendance throughout the
preparations of and during the activities.
D.6.6 F 600 Scope of work for operation
D.6.6.1 Detailed scope of work for operation is given in Table D-27 to Table D-32 and is summarised in Table
D-26.
DET NORSKE VERITAS AS
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 64
Table D-26 Summary Table - Operation
Table No.
D-27
D-28
D-29
D-30
D-31
D-32
Table Description
Commissioning
Integrity management and Quality Systems
Risk Assessment and IM planning
Inspection, Monitoring, Testing
Integrity Assessment
Mitigation, Intervention and Repair
Table D-27 Commissioning
Item
Description
Initial activities
1 Quality management system documents
2 Quality system audit / attend owner’s audit.
3 Specifications and procedures
4 Attend Kick-off meeting /Technical meeting / HAZOP meeting
Inspection activities
8 Filling of product/fluid
Base-line external survey (start-up inspection):
9 — Attend survey
— Review of survey reports
Base-line internal inspection (if applicable):
9 — Attend inspection, calibration of tool
— Review of inspection and assessment reports
10 Review of reports and documentation
Final activities
11 Issue of DNV visit report
12 Issue of DNV close out report
Level of involvement
Low
Medium
High
R1
-
R1
R2
X
R2
A
R2
X
-
S1
S2
R1
R1
S1
R2
I
R1
R1
R2
S1
R2
R2
X
X
X
X
X
Table D-28 Integrity Management (IM) and Quality System
Item
Description
Identify and review of governance / management and planning
1 Design, Fabrication and Installation (DFI) document
Philosophy documents (operation, inspection, maintenance and
2 repair/emergency philosophies)
3 Supporting philosophy documents (reporting and communication,
management of change, organization and personnel)
Integrity management system (PIMS) and interfaces between
4
activities
5 Main operating specifications and procedures
6 Audit of control room to review the day to day operation
Final activities
10 Issue of DNV visit report
11 Input to annual assessment report
DET NORSKE VERITAS AS
Low
Level of involvement
Medium
High
R1
R2
R2
R1
R2
R2
I
R1
R2
I
R1
R1
R1
S1
R2
S1
R2
S2
X
X
X
X
X
X
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 65
Table D-29 Risk Assessment and IM Planning
Item
Description
Risk Assessment review
1 Attend risk assessment meeting/workshop
2 Risk Assessment reporting
— Risk assessment according approved specifications
— Documentation of that the risk assessment covers all items which
failure may jeopardise the integrity of the pipeline system
— For each item, documentation shall show that all threats have
been identified and evaluated
— Review that the risk assessments are properly documented and
updated as appropriate, e.g. findings from integrity assessment
included (inspection, monitoring and testing)
Review of integrity management planning
3 Integrity management plan
— Review of integrity management plan (inspection, monitoring
and testing) to confirm that the plans are updated to reflect the
outcome of the risk assessments
4 Inspection, monitoring and testing strategy
Final - Reporting
5 Input to annual assessment report
Low
Level of involvement
Medium
High
-
-
X
R1
R2
R2
I
R1
R2
I
R1
R2
I
R1
R2
R1
R2
R2
R1
R2
R1
X
X
X
Table D-30 Inspection, monitoring and testing
Item
Description
Low
Level of involvement
Medium
High
Review of Inspection plans and reports (external and internal inspection)
1 Inspection plans
— Long term and short term inspection plans
R1
— Document that the pipeline system has been inspected according
I
to plans
— Deviations from inspection plans shall be properly documented
I
and approved
— Review that inspections are done and documented in accordance
I
with approved procedures
2 Inspection procedures
I
3 Site visits
4 Inspection reports
— Review that the results from the inspections been evaluated by
qualified personnel.
I
— Implementation of findings
Review of Monitoring & Test plans and procedures
5 Monitoring plans and procedures
— Documentation shall detail that the monitoring has been
R1
performed according to plans
— Deviations from monitoring plans shall be properly documented
I
and approved
— Review that monitoring are done and documented in accordance
I
with approved procedures
— The results from the monitoring shall be evaluated by qualified
I
personnel
Review of testing (corrosion testing, function testing of valves, pig launcher/receiver etc.)
6 Test plans and procedures
— Testing performed according to plans shall be documented
R1
— Deviations from test plans shall be properly documented and
I
approved
— Review that the testing has been done and documented in
I
accordance with approved procedures
DET NORSKE VERITAS AS
R2
R2
R1
R2
R1
R2
R2
R1
I
S1
R2
S1
R1
R2
R1
R2
R1
R2
R1
R2
R1
R2
R1
S1
R1
R2
R1
R2
Offshore Service Specification DNV-OSS-301, January 2014
App.D Detailed scope of work tables for verification and certification – Page 66
Table D-30 Inspection, monitoring and testing (Continued)
Item
Description
— Results from the testing shall be evaluated by qualified personnel
Reporting
7 Issue of DNV visit report
8 Input to annual assessment report
Low
I
X
Level of involvement
Medium
High
R1
R2
X
X
X
X
Table D-31 Integrity assessment
Item
Description
Review of integrity assessment
1 Integrity assessment report
— Integrity assessment performed according to approved
procedures shall be documented
— Integrity assessment has been done and documented in
accordance with approved procedures
— Results from the integrity assessment shall be evaluated by
qualified personnel
Reporting
2 Input to annual assessment report
Low
Level of involvement
Medium
High
R1
R1
R2
I
R1
R2
I
R1
R2
X
X
X
Table D-32 Mitigation, intervention and repair
Item
Description
Low
Review of mitigation (pressure change, corrosion inhibitors, inspection frequencies)
1 Procedures according to approved specifications
I
2 Implementation of procedures
I
Review of intervention
3 Procedures according to approved specifications
I
4 As built documentation
I
Review of repair
5 Repair strategy
I
6 Design reports
R1
7 Procedures
R1
8 Site attendance during execution
9 As built documentation
R1
Reporting
10 Issue of DNV visit report
11 Input to annual assessment report
X
DET NORSKE VERITAS AS
Level of involvement
Medium
High
R1
I
R2
R2
R1
R1
R2
R2
R2
R1
R2
S1
R2
R2
R2
R2
S1
R2
X
X
X
X
Offshore Service Specification DNV-OSS-301, January 2014
CHANGES – HISTORIC – Page 67
CHANGES – HISTORIC
Note that historic changes older than the editions shown below have not been included. Older historic changes
(if any) may be retrieved through http://www.dnv.com.
October 2000 edition
Amendments April 2012
— The restricted use legal clause has been deleted from the front page.
Amendments October 2011
— A restricted use legal clause has been added on the front page.
DET NORSKE VERITAS AS