Distribution Integrity Management Program
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NGA Fall Operations Conference - Oct 8-9th, 2015
Saadat Khan, P.E.
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Operating Regions
Boston Gas
538,382 Svc
7,206 mi Mains
Colonial Gas
188,854 Svc
3,857 mi Mains
Niagara Mohawk
555,686 Svc
8,643 mi Mains
Narassangett Gas
193,615 Svc
3,188 mi Mains
Brooklyn Gas
568,913 Svc
4,134 mi Mains
Keyspan Gas-LI
535,580 Svc
7,931 mi Mains
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2014 MAIN INVENTORY
U.S. COMPARATIVE SUMMARY
National Grid - US
34,960 MILES
2013 PHMSA Average
867 MILES
3
2014 SERVICE INVENTORY
U.S. COMPARATIVE SUMMARY
National Grid - US
2,581,030 SERVICES
2013 PHMSA Average
46,414 SERVICES
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Key DIMP Elements
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Risk Management
 Asset Based Risk Management
Pressure Regulation Facilities
Mains & Services
 Mains & Services Ranked Separately
 Each Asset Sub-Class Was Separately Evaluated For Each
Primary Threat Category
 All Risk Rankings Were Evaluated, Validated & Adjusted By
SME Panel
 Program Based Risk Management
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Risk Management
Mains & Services
 Risks are ranked independently within each LDCs e.g. Boston/Essex,
colonial, etc.
 Mains Include Pipeline Appurtenances
 Services Include Customer Connection Equipment
 Risk = Likelihood x Consequence of incident
 Likelihood of Incident
 Likelihood of failure/release
 Likelihood of Ignition
 Consequence
 Health & safety (60%)
 Customer interruption (20%)
 Regulatory and reputational impact (10%)
 Asset impact (10%)
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RISK MITIGATION
•
Asset Management (PAS-55)
•
Damage Prevention Programs
•
Gas Emergency Procedures
•
Incident Analysis
•
Leak Management Programs
•
Material Standards & Testing
•
Operator Qualifications
•
Personnel & Job Site Safety
•
Plastic Pipe Data Collection (PPDC)
•
Failure Database & Analysis for Emerging
Systemic Issues
•
Pipeline Public Awareness Program (PPA)
•
Proactive Main & Service Replacement
Programs (expanded to include “DIMP
Factor”)
•
Process Safety
•
Process Ownership
•
QA/QC
•
System Integrity Reporting
•
Corrosion Control
•
Special Patrols
•
System Design
•
Flooding Improvements
•
Storm Hardening
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Performance Measurement
 DIMP-Required Performance Measures
 In PHMSA Annual Distribution Report
 Hazardous Leaks Repaired (main & service) by CAUSE
 Total Leaks Repaired (main & service) by CAUSE
 Excavation Damages
 Excavation Tickets
 Workable Backlog
 Excess Flow Valves (EFVs) Installed
 Mechanical Fitting Failures
 Not In PHMSA Annual Distribution Report
Network Data Analysed and Tracked
in Annual System Integrity for Macro &
Micro Trends
 Hazardous Leaks Repaired By MATERIAL
 Additional Performance Measures in National Grid DIM Plan
 Excavation Damages / 1000 Tickets
 Main Leak Repairs / Mile (excluding excavation damage)
 Service Leaks / 1000 (excluding excavation Damage)
 Total Leak Receipts
 Response Time Performance
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DIMP Factor
 DIMP factor bridges Ngrid’s risk management to asset
replacement programs
 Based on past asset performance history and incidents
 Dynamically driven based on relative risk
 Accelerated attrition of mains that belong to asset group
known to have higher likelihood of incidents
 Effective risk management with evolving systematic
issues
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DIMP Driven Prioritization
Algorithm
START
No review
N
1 break or
Grapht’n repairs
within 400ft
CI
Y
Pres.> 6in WC
Y
Replace
CI or UPST
leak
UPST
Main
Segment
< 50ft
Replace
DIMP Factor
N
Calculate
Prioritization
Collect corrosion leak data
on segment for 10 years
Make adjustments to Pr using
“engineering judgment”, public
works & reinforcement
Y
Pr > 12
N
Prioritize and replace according
to resources & replacement
level recommendations
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Risk Management – Program Based
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Distribution Capital Investment
$1400
Investment in millions $
1,299
1,231
$1200
1,161
$1000
1,197
1,207
16‐17
17‐18
945
782
$800
751
666
659
682
08‐09
09‐10
10‐11
$600
$400
$200
$0
11‐12
Growth
12‐13
Mandated
13‐14
14‐15
Reliability
15‐16
18‐19
Other
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Questions?
[email protected]
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