Rete Gas
PLAN FOR THE IMPLEMENTATION OF NEW CAPACITY
AND FOR DEVELOPMENT
Document prepared by Snam Rete Gas S.p.A.
for compliance with the Delibera 137/02 of the Autorità per l’energia elettrica e il gas.
September 1st, 2003
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Foreword
Snam Rete Gas S.p.A. publishes the plan for the implementation of new capacity and the development of its transportation network prepared on the basis of
currently available information and on the basis of relationships with its own clients, securing transparency and impartiality among users in conformity with
provisions of Directive no. 98/30/EC of the European Parliament and of Law Decree no. 164/2000.
The present document has been prepared in compliance with the article 4 subsection 1 letter b, of Delibera no. 137/02 of the Autorità per l’energia elettrica e
il gas.
The projects that figure in the programme result from studies carried out by Snam Rete Gas on the basis of its own forecasts of capacity requirements.
The infrastructure development plans included in this document are not binding for Snam Rete Gas that, therefore, reserves the right to modify them every
time that new elements, such as for example evolutions of market requisites different from the current hypotheses, require it, as provided for in article 4
subsection 2 of Delibera no. 120/01 of the Autorità per l’energia elettrica e il gas.
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Index
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PLANNED INFRASTRUCTURES
1.1 Complete Programme
1.2 Transportation on the National Network
1.3 Transportation on the Regional Network
1.4 Main projects
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PLAN OF CAPACITIES
2.1 Entry Points interconnected with foreign pipelines
2.2 Exit Points interconnected with foreign pipelines
2.3 Methodology for calculating capacities
2.4 Operational constraints and boundary conditions used for simulations
2.5 Interruptible capacities
2.6 Simulation Programs
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ATTACHMENTS
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1 PLANNED INFRASTRUCTURES
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1 PLANNED INFRASTRUCTURES
1.1 Complete programme
The plan for implementation of new capacity and for development includes projects whose construction is under way and those whose start is scheduled in
future years, within the next four-year term. The level of project definition included in the plan changes, downwards, depending on their time collocation.
Furthermore Snam Rete Gas has planned to put out some sections of natural gas pipelines and some plants, which, in total, have no impact on the reliability
of the network of natural gas pipelines, or on the availability of transportation capacity.
The development projects have been evaluated on the basis of transportation scenarios that reflect forecasts of consumptions of natural gas in Italy,
relationships with subjects interested in starting-up new off-take points and those with users who use capacity in the inlet and outlet points. These projects
represent approximately 80% of the plan and are characterised by the presence of significant works that will make it possible in the near future to inject
quantities of gas onto the Italian network from the main pipelines supplying the Country. The remaining 20% of the plan includes different types of
interventions including those aimed preserving existing infrastructures. Preservation projects have been identified on the basis of information available on the
status of existing pipelines.
Works relating to Transportation on the National Network represent approximately 60% of the plan, while those relating to Transportation on the Regional
Network represent approximately 40% of the plan.
In total the Snam Rete Gas Group plan provides for development of the network of gas pipelines from the 30,160 km forecast for the end of 2003, to the
31,700 km planned for the end of the 2003-2006 four-year term, with a further increase of up to approximately 31,900 km in the following years.
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Similarly, the increase of installed capacity in the Compressor stations is forecast in the plan from the current 625 MW (37 compressor units in 11 stations),
up to approximately 800 MW in the four-year term (seven new units to be installed in existing stations). A further increase of approximately 50 MW (one new
station with three units) is planned in the following years.
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1.2 Transportation on the National Network
86% of the National Network Development Plan is composed of projects already being implemented or that will be started during 2003, while the remaining
14% are planned to start in the following years.
These infrastructures are destined mainly to reinforce the importation system, and will include the completion of works dedicated to importation from Russia
and those for connection from the LNG terminal of Panigaglia, carrying on with activities related to the new Gela – Enna gas pipeline and works for
development of the pipelines system from the South. These works will be presented in detail in paragraph 1.4.
Furthermore, phases of design and permits related to possible further developments of the Transmed backbone have started.
The remaining development projects are aimed at reinforcing other main national transportation pipelines, mainly located in the areas of Apulia, Southern
Piedmont and the North-East. These include works related to the Bernalda – Palagiano natural gas pipeline which are under completion and the recently
started works to develop the connection to the storage of Collato and of the Verona - Trento (section Bosentino-Aldeno) natural gas pipeline. Planned works
for reinforcing the Alessandria – Oviglio, and Verona-Trento (section Vigasio-Sona) natural gas pipelines have not yet started.
In total the plan will develop the National Network from approximately 8,000 km, planned for the end of 2003, to approximately 8,600 km, at completion of
plan. The compression system will be developed from the current 625 MW, distributed over 37 compressor units, to approximately 850 MW at completion of
plan, resulting from the installation of 10 new compressor units, for a total of approximately 220 MW of new compression capacity.
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1.3 Transportation on the Regional Network
44% of the National Network Development Plan is composed of projects already being implemented or that will be started during the current year, while the
remaining 56% are planned to start in the following years.
These infrastructures are aimed at extending and reinforcing of the regional transportation network, for which completion of the following natural gas pipelines
is planned: Valtellina, Bolzano – Bressanone – Brunico and Contursi – Battipaglia. Work for the Giarratana – Solarino natural gas pipeline, to develop supply
to the industrial centre of Brindisi and to develop the connection to Abbadia Lariana have started. In addition, reinforcements are planned in the area of
Southern Piedmont (Oviglio - Ponti and Cherasco – Cuneo gas natural pipelines), in Lombardy (Casaletto – Chiuduno, Mornico al Serio – Zanica and Mornico
al Serio – Ospitaletto natural gas pipelines), in Apulia (Triggiano – Locorotondo natural gas pipeline), as well as reinforcement of the network of Umbria
(Pietrafitta – Perugia natural gas pipeline), the Forlì - Faenza natural gas pipeline loop and the Palaia – Livorno natural gas pipeline.
Furthermore, on the basis of relationships developed with the subjects interested in connecting their own sites to the transportation network and of feasibility
studies carried out, many connections of new thermoelectric power plants, of industrial plants and of distribution networks scattered in the eight territorial
districts, have been identified. Some of these works have already started. Meanwhile for the remaining ones, for which to date no defined contractual
agreements exist, actual planning and implementation is subject to confirmation of interest by the requesting subjects and to the subsequent conclusion of
agreements for connection. Started initiatives concern 7 new thermoelectric plants with capacity of approximately 4,000 MW; meanwhile implementation of
approximately 100 connections in total per year is planned for the remaining types. At the same time, implementation of connections included in the plan of
Methanization of the South goes ahead.
In total the plan will develop the Regional Network of Snam Rete Gas from 22,160 Km, in the year 2003 to approximately 23,100 km, at the end of 2006, and
an increase of approximately 200 km in the following years, with a total increase of approximately 1,200 Km.
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1.4 Main projects
To complete the description of the plan, hereinafter the most significant infrastructures are indicated in terms of their impact on effectiveness of the
transportation system. These projects represent approximately 50% of the total and they are related to the implementation of works substantially distributed
all along the Snam Rete Gas transportation network.
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1.4.1 Additional Importation from Russia
The project consists in laying approximately 190 Km of 48” pipeline and 43 km of 56" pipeline (section Camisano-Zimella), parallel to existing 36” and 42”
lines between Tarvisio (province of Udine) and Zimella (province of Verona).
The above-mentioned works, 97 km of which are operating (sections Flaibano-Oderzo and Malborghetto-Bordano), will be completed within the year 2006,
thus allowing for an increase in importation capacity from Russia, at the entry point of Tarvisio, up to 103 Mm3/day.
1.4.2 Importation from Northern Europe
The project consists in replacing 42 Km of 34” pipeline with a new 48” pipeline (section Gries Pass-Masera), laying 134 Km of 48” pipeline alongside the
existing 34” one in the Masera-Mortara section (sections already completed) and in implementing a new compressor station provided with three units of
approximately 12 MW each one.
The above-mentioned works, completed in the year 2002, have increased imported volumes at the entry point of Masera to approximately 60 Mm3/day.
Additional works and restorations are under way.
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1.4.3 Gela – Enna natural gas pipeline
This project meets the requirement to enable connection of the importation line coming from Libya. Furthermore, connected to implementation of the
Giarratana-Solarino natural gas pipeline, it allows for closure of network ring operating for supply of the area of South-Eastern Sicily.
The project consists in implementing a natural gas pipeline 66.5 km long and 36” in diameter, which connects the landing point of the sealine, located in Sicily
in the vicinity of Gela, to the national gas pipeline network. Interconnection is planned on the Transmed natural gas pipeline at the level of the compressor
station of Enna.
Construction of the natural gas pipeline has started and its commissioning is planned in the year 2004.
Its implementation, together with the “Transmed Reinforcement” initiative, will provide capacity of approximately 25 Mm3/day at the Gela entry point,
providing, furthermore the above-mentioned advantages for the South-Eastern Sicily.
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1.4.4 Reinforcement of Transmed
During the year 2002, SNAM Rete Gas launched investments necessary for implementing works to reinforce the backbone importation network consisting of:
à Implementation of a 3rd line (DN1200) with a total of approximately 290 km in the Enna-Montalbano, Palmi-Martirano, Campochiaro-Sulmona sections;
à Reinforcement of the existing stations of Tarsia, Montesano, Melizzano, Gallese, Terranuova by means of the addition of one extra compressor unit;
à Reinforcement of the station of Messina by means of the addition of two new compressor units;
à Adjustment of piping and auxiliary plants in the existing stations.
Commissioning of these works is planned within the year 2006; they will provide approximately 86 MSm3/day at the entry point of Mazara del Vallo and the
already mentioned 25 MSm3/day at the entry point of Gela.
1.4.5 Pontremoli – Parma natural gas pipeline
The project involves the laying of approximately 70 Km of pipeline DN750 between the site of Pontremoli and Parma, 39 km of which have already been
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implemented. The above-mentioned work will be completed within the year 2004 and will form a new connection of the LNG terminal at Panigaglia to the
National Network.
The natural gas pipeline will be laid alongside the existing section of Cortemaggiore – La Spezia, which follows a different line, thus increasing total capacity
to 13 Mm3/day.
1.4.6 Compressor station of Poggio Renatico
The project is at the study stage and involves the implementation of a new compressor station in the vicinity of the distribution node of Poggio Renatico
(approximately 20 Km from Minerbio). It will allow for compression of increasing volumes of gas coming from the importation pipelines from Russia and from
North Africa that converge in the area of Minerbio and transportation on the National Network of natural gas injected by the planned LNG terminal of Porto
Viro (province of Rovigo), which is planned to join in the area of Minerbio by means of an apposite connection. Programming of commissioning of this station
will depend on the development of capacity plans of the above-mentioned entry points.
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1.4.7 Natural gas pipeline for Valtellina
This natural gas pipeline will connect Calco to Berbenno and increase supplies in the already supplied areas of Lecchese, High Lario, Low Valchiavenna and
Valtellina, and allow the methanization of Valsassina and of Valtellina. The work is composed of two sections. The first (Calco – Piantedo) with a diameter of
30” and length of 64 km, was commissioned in the year 2001; additional works and restorations are under way.
The second section (Piantedo – Berbenno) with a diameter of 20” and length of 25.2 km, will be completed by the year 2003.
1.4.8 Alessandria – Oviglio natural gas pipeline and Oviglio-Ponti natural gas pipeline
The projects involve the laying of approximately 12 km of pipeline in the National Network (section Alessandria – Oviglio) and approximately 38 km of pipeline
in the Regional Network (section Oviglio-Ponti) both with a diameter of 30”, which will reinforce the existing transportation lines of the South-Western
Piedmont and Liguria, avoiding bottle-necks on existing networks, considering also the medium-term development of natural gas consumption in the abovementioned area.
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1.4.9 Giarratana- Solarino natural gas pipeline
The project consists in laying 38 km of 24”-diameter pipeline and completes the continuity of installations between both the Calderari – Bivio Gigliotto – Gela
line to the West, and the Sparacollo – Carcaci – Priolo line to the East, forming a ring structure between terminals of the above-mentioned lines.
Commissioning of this work is planned within the year 2004 and will allow for transportation in the consumption areas of Priolo, Augusta and Catania, with an
increase of redelivery pressures to users, and with development of consumptions estimated at 3 Mm3/day at least in this area.
The natural gas pipeline will also enable further development of natural gas consumption in the civil sector, allowing for possible connection of interested
municipalities along the route.
1.4.10 Reinforcement of connection for the industrial centre of Brindisi
The project involves the implementation of a 42”-diameter pipeline of approximately 10 km.
Commissioning of this work is planned for the first months of 2004 and will allow for transportation of quantities of natural gas required for the development of
relevant thermoelectric projects in the Brindisi area, with capacities currently estimated at 6 Mm3/day with the possibility of developing a further 6 Mm3/day.
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Furthermore it will be possible to connect to it the planned LNG terminal, and thus makes it possible for natural gas injected by it to be transported towards
the national network.
1.4.11 Initiative for the region Apulia
The project involves the implementation of connections and related reinforcement of the natural gas pipeline network in the Apulia region. These works will be
implemented in three phases to be completed in the year 2004.
1.4.12 Bolzano – Bressanone – Brunico natural gas pipeline
Investment consists in implementation of two pipelines:
-the first section, Bolzano – Bressanone natural gas pipeline, involves the laying of 54.8 km of 20”-diameter pipeline 46 Km of which were commissioned in
the year 2002;
-the second section, Bressanone – Brunico natural gas pipeline, involves the laying of 37.7 km of 12”-diameter pipeline to be commissioned in the year 2004.
Implementation of this natural gas pipeline will allow quantities of gas required to meet the increase in consumption in the already-supplied areas of Bolzano
and Merano to be transported, further to the extension of methanization in user basins not yet methanized.
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2 PLAN OF CAPACITIES
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2.3 Methodology for calculating capacity
For the purposes of dimensioning and operating the system, marketing transportation services, and fulfilling the requirements of current legislation and the
resolutions of the Autorità per l’energia elettrica e il gas, Snam Rete Gas carries out periodic analyses of its transportation system, aimed at establishing
capacities at entry points interconnected with external systems.
On the basis of conventions commonly used by European operators, transportation capacity is the highest quantity of gas that may be injected into the system
during the Gas-day, at a specific point and transported from there to the consumption centres, in compliance with the technical and operational constraints
defined in each section of the pipelines and of the highest performances of plants erected along the same pipelines. These capacities are estimated by means
of hydraulic simulations of the network, performed in appropriate transportation scenarios and according to acknowledged technical standards. These
simulations are carried out under steady state conditions and represent the average transportation day, with an established modelling of the network, of plants
and of boundary conditions. The considered constraints take into account these approximations in the model used and constitute a security margin that
guarantees actual availability of calculated transportation capacities, under real operating conditions.
Transportation capacity may be made available to users with transportation services of a firm or interruptible type. Estimation of firm transportation capacities,
whose availability must be guaranteed in any situation and at any period of the thermal year, refers to cautious transportation scenarios and constraints. On
the contrary, estimation of interruptible capacities uses existing transportation margins under special conditions or with less severe constraints.
The transportation of the firm capacity is guaranteed under every possible operational condition, since it is calculated taking into account the most severe
market scenarios; it ensures that for any considered year, it is not possible to foresee a worse transportation situation other than unavailability or failures in
the transportation structure, which cannot be foreseen in advance. The scenarios that have just been described may be considered as “special” operating
conditions. Under “normal conditions”, which correspond to the usual operating conditions, the transportation capacities are prevalently subject to market
fluctuations, in terms of entities and collocation, and to unavailability of plants, for example for ordinary or extraordinary maintenance. Under normal conditions
it is possible to use transportation structures more, if less restrictive technical and operational constraints than those used for verifying special conditions, are
assumed. With respect to inlet capacity values calculated under special conditions, additional capacity values, published as interruptible capacities, thus
subject to reduction or interruption, depending on operating condition requirements, are obtained from the transport simulations of normal conditions.
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Therefore, it is possible to summarise that performances of the transportation network may fluctuate between two conditions: a “normal” condition that may be
encountered during every day operations, but that cannot be guaranteed during the whole year, to which “interruptible” capacity availability corresponds and
a “special” condition that may be encountered and guaranteed every day of the year, to which the “firm” capacity corresponds.
In turn, interruptible capacity may be subdivided into two reference groups: annual and seasonal.
Some general information on the entire transportation capacity calculation process, including the technical characteristics of the simulation
system are indicated below, to be utilised by all users.
2.4 Operational constraints and boundary conditions used in simulations
2.4.1 Delivery pressures
For the purpose of transportation verifications, reference is made to delivery pressures at the entry points, which have been defined, jointly with the foreign
companies involved, on the basis of dimensioning calculations carried out in order to define in a complete way the reinforcement required for both systems,
with respect to increases in volumes of transiting gas programmed on the basis of market requirements.
The assumed pressures constitute a fundamental reference for system dimensioning and operational service, and for this reason, in compliance with the
Network Code they are notified to users by publication on the Transporter’s web site.
Currently valid delivery pressures are illustrated below:
Entry Point
Minimum contractual pressure
(barg)
Tarvisio
56.5
Gorizia
70
Gries Pass
49
Mazara del Vallo
75
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2.4.2 Maximum pressures of pipelines
The maximum operating pressure of pipelines cannot exceed the maximum project pressure, a value that normally coincides with the pressure value from
CPI, i.e. the pressure for which the authorisation is given by the competent authority (VVFF). In order to avoid exceeding the pressure by CPI along the
pipelines, which could be caused by changes in elevation or by transitory transportation regimes, control and monitoring pressure systems are used,
calibrated on “limit” pressure values of 1¸2 bar less than the allowed limit (the value is determined each time taking into account the system control
tolerances). In some cases lower maximum operational values than those above are used on a temporary basis. These values are also taken into account
when calculating capacity.
Some sections of pipelines relating to importation from Northern Europe and Russia, constructed in the Seventies and almost completely doubled or tripled
with new pipelines, are operated at lower pressures down to 55 bar.
2.4.3 Minimum pressure along the pipelines
In relation to the forecast configuration, in particular points of the transportation network, the minimum pressures required to guarantee system performances
are identified. In particular, the minimum pressure at inlet of the compressor station normally assumes the value of 55 bar for importations from the South, and
of 50 bar for those from the North. Similarly, minimum pressures are assumed at particular network points defined depending on the guarantee of minimum
contractual pressures at Redelivery Points; the points concerned are the distribution nodes of Mortara and Sergnano, in which the lowest value is 50 bar.
It must be noted that modulation of loads withdrawn by the market during the day generate fluctuation of pressures on the network, reaching lower values
than those shown by transportation simulations under steady state conditions. Pressure values assumed as permissible for any point on the network take into
account both these daily fluctuations and those attributable to transients due to the most common operational conditions.
2.4.4 Design and operation of compressor stations
As regards operating the compressor stations, the transportation conditions that require utilisation of turbo compressors limited to the maximum rated
performances, to which an appropriate reduction factor is applied, are considered permissible. These coefficients allow for keeping adequate security margins
in order to take into account, on one hand, approximations inherent in the modelling of unit operations and, on the other, adequate available performance
margins, so as to be able to cope with operational conditions that may occur in reality (mainly daily and operational fluctuations of transportation) and that
cannot be taken into consideration in simulations. Assumed coefficients of highest use of the turbo compressors are:
- Power generated by the turbine equal to 95% of the maximum “on site” power;
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- Number of revolutions of compressor and turbine (RPM) equal to 100% of nominal revolutions (RPM)
For the purposes of security and reliability of the transportation system, at least one spare unit (or “emergency”) is installed in any plant, which, under normal
operating conditions (including the most severe transportation scenarios), is able to replace each of the used units. This also allows for carrying out normal
maintenance of the compressor units without interruption or transportation reduction. The number of spare units depends on the number and power of the
compressors installed in the plant. For stations with up to three installed units, in general only one unit is kept for emergency (or two units of a lower capacity
than those operating, provided that the sum of the respective powers is higher than or equal to the power of each one of the functioning units). In the case of
plants with four or more installed units, two units are also kept as spares with a unitary power that is at least equivalent to that of the functioning units.
A further constraint to be considered in plant operations is the range of head and permissible flow rates depending on the characteristics of the installed
compressors, defined, in the design phase, in order to optimise the provided service operations. This may materialise in the limitation of the highest delivery
pressures even in the presence of capacity available on turbine or, in other cases, in the need to use special couplings of installed units in some operating
ranges.
Finally, it is clear that the delivery pressure cannot exceed the highest permissible pressure for the pipeline(s) downstream from compression, as previously
explained.
2.4.5 Market scenarios
They consist in all user off-takes from the Snam Rete Gas transportation system. For the purposes of defining network performances, these scenarios are
defined from time to time so as to take into account the most severe transportation conditions. For the purposes of defining capacities at the Entry Points
interconnected with the foreign pipelines, the most severe scenario for importation from Russia and Northern Africa is that of summer, in which as a result of
reduced off-takes of the market along the line and of requirements for storage injection, the entry gas volumes must be transported for longer distances. In the
case of the Point of Gries Pass, located in the vicinity of important consumption centres, seasonality is less emphasised; the most severe scenario may also
be that of winter, as it has been shown by performed hydraulic simulations, since at some junction points of the network, levels of pressure that allow for
suitable feeding of pipelines going out from here, must be guaranteed.
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The choice of reasonably cautious conditions in which to carry out simulations constitutes a security factor. The choice of reference conditions considered to
be the most severe guarantees the availability of capacity resulting under other reference conditions even in presence of deviations from these boundary
conditions.
Verifications required for definition of the transportation capacities are carried out taking as reference scenarios of off-takes from the network based on the
evolution of demand for gas in Italy during the next 10 years.
2.5 Interruptible capacities
In the context of establishing firm transportation capacities, the quantity of annual interruptible transportation capacities and seasonal interruptible capacities
are estimated for subsequent scenarios, the analyses of interruptible capacities are not very significant, since there is an increasing uncertainty concerning
market off-takes and network structures, affected by maintenance operations to be planned, possible cases of unavailability of plants and time schedules for
commissioning new reinforcement; therefore analyses are carried out each year only for the next year.
The characteristics of interruptible transportation capacities (annual or seasonal), in terms of the duration of interruptions and procedures for activating them,
are published by the Transporter on his web site; a general description of them is given below.
2.5.1 Annual Interruptible Capacities
Firm transportation capacities are those resulting from the most severe transportation scenarios that can be foreseen on the network. These quantities are
transportable upon the request of the users for whom they are booked at any moment of the year, except in the periods when structural maintenance is
carried out. Strictness with which these estimations are carried out, aligned with the standards of the European transportation companies, results from
liabilities assumed by the Transporter towards users to guarantee, in some cases also for long period of time, reliable transportation of quantities, object of the
contract. In many cases however, effective operation of the network is carried out also with lower pressure values, which are acceptable at the operational
level but that cannot be considered as “usual” for “ex ante” determination of capacities that will be booked. Other scenario values, such as for example,
disposal on the network, of withdrawals for storage, may also affect estimation.
In these cases, which are, however, situations compatible with normal operations, further transportation capacities, with respect to the firm ones, may appear.
In order to estimate these capacities, reference parameters in the hydraulic calculation (typically lowest pressures along the network), which are less
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restrictive than those used for calculating firm capacities, but that guarantee however suitable security margins, may be used. These capacities may be
defined as annual interruptible capacities and have the following characteristics:
· Availability is secured unless there are particular events of the network (configuration of off-takes reduced on the whole network or on part of it that
affects capacity of transportation for importation; high requests of pressure at some points along the importation line in order to meet higher than
expected local market requests or special network configurations).
· For given types of possible interruptions that will more likely occur during weekends and holiday periods, or however of lower market off-take (which is
usually planned slightly in advance), a few days’ notice can usually be given for interruptions or reductions in the annual interruptible capacity (at weekly
planning level).
In some cases (such as importation from North Europe) in which seasonal effects of off-takes on transportation capacities are small, interruptible
transportation capacities may be calculated on the basis of an average value of interruptible capacities available during the various periods of the year.
2.5.2 Seasonal Interruptible Capacities
There is a second group of interruptible capacities, to be considered as the capacity that could be transported in addition to the annual one, affected by
external factors such as variability of off-takes due to climatic conditions, which is why the term “seasonal” is used. During the winter, as a result of a drop in
temperature that implies an increase in off-takes, it is indeed possible to inject a higher quantity of gas from the Points of importation without overloading the
importation lines themselves to the same extent. As the term used to describe them implies, with interruptible capacities the Transporter reserves the right to
reduce the quantity of imported gas, either totally or partially, any time conditions require it, to safeguard the status of the network and operational security,
maximising coverage of market demand.
To determine these capacities, average capacities of those relating to verifications with standard constraints of the network, similar to those used for
calculating firm capacities, and those with constraints similar to those used for calculating annual interruptible capacities are considered. Analyses are carried
out with a winter holiday scenario (January). This category of capacities has the following characteristics:
· period of availability of this capacity is normally from October to March;
· given the type of possible interruptions that are more likely to happen during weekends and winter holiday periods, coinciding with particularly mild
weather, normally foreseeable 2/3 days in advance, a few days’ notice can be foreseen for interruptions or reductions in seasonal interruptible capacity
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2.6 Simulation programs
Transportation of gas on the Transporter’s network is checked by hydraulic simulations carried out using special “ad hoc” simulation systems, developed for
simulating a meshed network such as the one operated by Snam Rete Gas. For calculating capacities at Entry Points on the National Network interconnected
with foreign pipelines, the simulation system called SIRE produced, according to the Transporter’s specification, by the company TEMARS (currently called
EniData) of Bologna, which is also responsible for its maintenance and updating, has been used.
2.6.1 The SIRE system
The SIRE system is represented by a set of programs aimed at simulating meshed networks and compressor stations (the latter also one at a time and
“disconnected” from the network) either under steady or dynamic conditions. Interaction with the system occurs by means of graphical interface that enables
both the introduction of data required for the “topological” description of the network and the transportation scenarios to be checked and analysis of simulation
results. Main characteristics of system allow for :
· “modelling” of the network representing it by sections of network, of length not higher than 50 km, that connect significant points, called “calculation
points”; these points correspond, in the model, to physical elements such as main connection points between pipelines, detachment points of shunts or
of distribution networks, changes of diameter, important changes of depth profile of pipelines. The “calculation points” are also located at the level of the
compressor stations and of injection points in the network from importations or from more important national productions;
· simulation of a network for calculation of the following sizes:
a) pressure, temperature and composition of gas at all the represented points of the network ;
b) flow rate and composition of gas in any section;
c) working points of turbines and active compressors and calculation of the main related sizes;
d) determination of operational parameters in the special components (plants, valves, importations, wells, storage facilities, off-takes);
· concentration of off-takes of gas in the “calculation points”, as well as quantities of gas injected in the network from the inlet points;
· resolution of a system of equations related to balances of energy, flow rate, composition and transportation equations according to formulas and models
acknowledged by scientific literature and by technical associations for gas;
· utilisation of a model related to compressor stations, based on:
a) application of the criterion for characteristic control of plant for distribution of flow rate between the units;
b) realistic simulation of the working point of compressors and turbines, thanks to the use of a mathematical model that describes effective
characteristic curves of the single machines, resulting from field data (where available) or from expected curves (“expected”) provided with by the
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manufacturers; this simulation allows for determination, with a good approximation, of the working perimeter of stations based on the effective limit
curves (antisurge, minimum and maximum number of revolutions, maximum power);
c) calculation of sizes of units and plant based the model of units (for example: consumption of gas, power required by the compressor and power
supplied by the turbine).
In all the models of calculation, the following base main equations are used:
Calculation of pressure drop
Equation of Fergusson
Equation of status for calculation of
Z and deduced factors
Equation of Redlich-Kwong
Calculation of friction factor
Equation of Serghides
(Colebrook approximation)
Calculation of viscosity
Method of Dean-Stiel
2.6.2 Model of network and simulated scenarios
For the purposes of transportation verification of the importation capacities, transportation is simulated, under the steady state conditions, on a network
substantially coinciding with the National Gas Pipeline Network. In the simulated network some significant sections of the transportation network that are not
part of the National Network, whose structures are especially affected by the upstream network structure, are represented. On the contrary, current off-takes
and injections of gas, on networks diverted from the simulated network, but not represented here, are taken into account by means of appropriate criteria for
“aggregation” that consider structures of the same networks.
2.6.3 Reports
The system makes it possible to print the main results in both graphical and alphanumerical form, with respect to flow rates of gas and to performances of the
compressor stations. The graphical representation of the network of the natural gas pipelines is schematic but sufficiently correlated to the real geographical
layout.
27
3 ATTACHMENTS
28
List of Development Projects
NATIONAL NETWORK
Diameter Length
(mm)
(Km)
Add. Import. Russia:sect. Flaibano-Oderzo
1200
Add. Import. Russia: sect. Istrana - Camisano 1200
Add. Import. Russia: sect. Bordano-Flaibano
1200
Add. Import. Russia:sect.Tarvisio-Malborghetto 1200
Add. Import. Russia: sect.Malborghetto-Bordano 1200
Add. Import. Russia: sect. Camisano-Zimella
1400
52
37
32
24
45
43
Add. Russia: ad. Station Malborghetto
North Europe: new Station of Masera
1200
North Europe: Passo Gries-Mortara
North Europe: adjust. Inst.m Masera & Mortara
Nat.gas pipel. Gela-Enna
900
Reinf. Transmed: Station of Enna
(piping)
Reinf. Transmed: Station of Messina (reinf.)
Reinf. Transmed: Station of Tarsia
Reinf.Transmed: Station of Melizzano (piping)
Reinf.Transmed: Station of Gallese (reinf.)
Reinf.Transmed: Station of Terranuova B. (reinf.)
Number Power
of units (MW)
Diameter Length
(mm)
(Km)
Reinf. Transmed: Station of Tarsia
Reinf. Transmed: Station of Montesano
Reinf. Transmed: Station of Melizzano
Reinf. Transmed: Station of Montesano
Reinf. Filters and Measur. syst. of Masera
3
36
-
-
177
67
2
1
1
60
25
12
Reinf. Transmed: Nat.gas pipel.Enna-Montalbano 1200
Reinf. Transmed: Nat.gas pipel.Palmi-Martirano 1200
Reinf.Transmed: Nat.gas pipel.Campochiaro-Sulmona 1200
900
Nat.gas pipel.Pontremoli - Parma
Station of Poggio Renatico (Fe)
86
112
94
70
1050
600
400
Nat.gas pipel Gagliano-Sparacollo
Reinf. Nat.gas pipel. Alessandria-Oviglio
750
Doub. Nat.gas pipel.VE-TN: sect. Vigasio - Sona 500
Reinf. Nat.gas pipel.VE-TN: sect.Bosentino-Trento
400
7
15
16
12
15
9
Nat.gas pipel. Bernalda-Palagiano
Connect. storage of Collalto
Number Power
(MW)
of units
1
1
1
-
25
25
25
-
3
50
29
REGIONAL NETWORK
Reinf. Industr. Centre of Brindisi
Natural gas
i li
O i lipipe 2nd feeding of
Reinf.Nat.gas
N l
Pot.Met.Bn-Cisterna
Tr. Bn-Piana di M.V.
Pot. Der.Ne per Bagnoli
Pot. Tr. Sergnano-Malossa
Pot. Der. Sermide:Castagnaro-Bergantino
Pot. Bernalda-Altamura: Bernalda-Matera
Met. Giarratana-Solarino
Met. Palaia-Livorno
Pot. Bernalda-Altamura: Matera-Altamura
Coll. Der. Lecco al Met. per La Valtelli
Pot. Cherasco - Cuneo (Cn)
Pot. Br-Arnesano 1ø/2ø Tr. Br-Trepuzzi
Pot. Casaletto - Chiuduno
Met. Gagliano-Capizzi-Sciara Tratto Capizzi-Mistretta (Me)
Met. Bz-Bressanone-Brunico
Met. Mornico al Serio-Ospedaletto 2° Tr.
Met. Mornico al Serio-Ospedaletto 1° Tr.
Met. Mornico al Serio - Zanica
Pot. Br-Arnesano 3ø Tr. Trepuzzi-Arnesan
Pot. Zanica - Comun Nuovo
Der.Ne per Alcamo-Giardiniello E Dir.
Pot.:Coll. Albano di Lucania-Salandra
Met. Triggiano-Locorotondo: 1° Tratto
Der. Sannicola-Ugento-Tricase: 2ø Tr.
Pot. Rete Umbra: Pietrafitta-Perugia
Raddoppio Met. Forli'-Faenza
Der. Cagnano V.-Carpino: 2ø Tr.
Met. Triggiano-Locorotondo: 2° Tratto
Met. Contursi-Battipaglia
Met. Gattinara (Vc) - Prato Sesia (No)
Der. Sannicola-Ugento-Tricase: 3ø Tr.
Pot. Met. Gozzano-Domodossola
Raddoppio Deriv. per Tolmezzo
Pot.Der.per Riva Del Garda
Pot. Deriv. per Sestri Levante 2° Tratto
Pot.Met. Mondovi'-Cuneo
Pot.Der. per Abbadia Lariana
Pot.:Coll. Carpi-Novi di Modena
Met. Settala-Rodano
Diametro
Lunghezza
(mm)
(Km)
1050
9,8
750
37,5
750
20,7
750
20
750
14,5
750
13
750
11,7
600
40,1
600
38
600
29
600
15,8
600/300
1,6
500
36
500
26
500
25
500
16,5
500/300/250
92,7
500
11,5
500
11
500
10
500
8,8
500
3,9
400/100
48,1
300
25
300
25
300/250/100
24,4
400
23
400
21,7
250
21,2
300
20
400
19,5
400/200/150/100
18,1
300/150
14,7
200/150
12,9
250
11
300
10,9
400
10
400
10
300
9,9
300
9,3
300
7,4
Raddoppio Mira-Mestre
Raddoppio Deriv. per Pontelongo
Pot. Der. per Vittorio Veneto (Tv)
Pot. Spina Nord di Casalpusterlengo
Pot. Met. Raldon - Legnago
2° Pot.Met. Santerno - Imola
Pot. Derivazione per Lucera (Fg)
Ba 11: All. di Castelmezzano (Pz)
All. Comune di Alia (Pa)
Pot.:Coll. Alpignano-Der. per Condove
Cl 8: Dir. per Carpanzano (Cs)
Cl 2: Der. per Mottafollone (Cs)
Cl 24: All. di Casabona (Kr)
Dir.Ne per Palermo
Pot. Metanodotto Lurago-Pontelambro
Cl 22: Der. per Stignano (Rc)
Pot. Derivazione Manzano-Buttrio (Ud)
Cl 7: All. di Zungri (Vv)
Pot. Der. Sud Cantu'
Ca 13: All. di S. Nicola M. (Bn)
Pot. Spina Cava Dei Tirreni
Pot. Der. Castelnuovo - Garfagnana
Ca 15: All. di Baselice (Bn)
Cl 20: All. di Cropalati (Cs)
Pot. Met. Cesano Maderno-Novara
Ba 1: All. di S. Martino D'agri
Ba 8: All. di Accettura (Mt)
Pot.Der. per Fabriano E Sassoferrato
Ca 14: All. di Morcone (Bn)
Pot.Der. per Varese
Pot. Met. Boltiere - Bergamo
Pot. All. Com. di Montecatini 1ª Presa
Pot. Der.Ne per Suzzara (Mn)
Pot. Diram. per San Pellegrino
Pot. Zona Industr. di Vicenza
Pot. All. Comune di Meldola (Fo)
Pot.All.Comune di Alfonsine
All. Comune di Macchiagodena (Is)
Metanodotto Meleti - Maccastorna
Coll. S.P. Clarenza - S. Gregorio
Pot. Met. Albino - Cazzano Sant'andrea
Diametro
(mm)
400
200
250
200
250
400
300
100
100
300
150
200
100
250
300
250
250
150
250
150
250-200
300
150
100
400
100
100
150
100
300
300
300
300
300
250
200
150
150
400
400
300
30
Lunghezza
(Km)
7,1
7,1
6,9
6,7
6,5
6,3
6,2
6,1
6
5,9
5,8
5,6
5,5
5,4
5
4,9
4,8
4,8
4,7
4,5
4,3
4,1
4
4
4
4
3,8
3,6
3,6
3,5
3,3
3,1
3
3
3
3
3
3
2,9
8
7,8
Pot. Der. per Marcon (Ve)
Pot. Met. Vimercate-Muggiò
Pot.Der. per Trezzano Rosa
Pot. Der.Ne per Adria (Ro)
All. Comune di Scampitella (Av)
Pot.Der.per Ozzano-3ª Parte
Ca 13: All. Campoli Del Monte Tab.
Cl 20: All. di Mandatoriccio (Cs)
Pot. Spina di Corchiano 1o Tronco
Pot. Der. per Pegognaga (Mn)
Pot.Spina per Dresano
Ca 13: All. di Apollosa (Bn)
Pot.Der. per Mozzate
Pot. All. Comune di Trani
Pot.:Coll. Der. per Verzuolo-All. Burgo
Pot. Deriv. per Nave-Caino
Coll. Alim. Nord Mi - Lentate S.S.
Pot. Der. per Mariano Comense
Pot.Der. per Lozzolo
Pot. All. Comune di Lamporecchio Pt
Pot. Der. Concorezzo Nord
Pot.Spina Z.I.Rovigo
Potenziamento Derivazione per Bellusco
All. Durazzano (Bn)
Pot. Spina Nord di Treviso
All. Comune di Gambatesa (Cb)
Pot. Derivazione per Curno (Bg)
Pot. Der. per Vanzago
Pot.Spina di Marcon (Ve)
Pot.Spina Sud di Crema
All. Nicotera (Vv)
All. Sellia (Cz)
Ba 11: All. di Trivigno (Pz)
Pot.Der.per Piovene Rocchette (Vi)
All. Comune di Sant'arcangelo (Pz)
All. Buonabitacolo (Sa)
Pot. Deriv. per Rossano Veneto
Pot. Deriv. per Sestri Levante 1° Tratto
Pot. Deriv. per Arzano-Casavatore
Pot.Der. per Anzio 3° Tratto Dn 100
Pot.All. Pontenossa Spa
Pot. Spina per S. Giorgio Su Legnano
All. Comune di Santa Severina (Kr)
All. Pietragalla (Pz)
Coll. Met. Castano-Buscate E Der. Inveru
Pu 30: All. Greci
Pot. All. Comune di Pomigliano D'arco
All. Settingiano (Cz)
Diametro
(mm)
250
300
250
250
100
200
100
100
150
250
200
100
250
200
300
200
300
300
200
200
200
250
200
100
200
100
250
250
200
200
150
150
100
250
100
100
200
400
200
150
200
150
100
100
200
100
200
100
Lunghezza
(Km)
2,5
2,5
2,5
2,5
2,5
2,3
2,3
2,3
2,2
2,2
2,2
2,2
2,2
2,1
2,1
2,1
2
2
2
2
1,8
1,8
1,7
1,7
1,6
1,6
1,4
1,4
1,4
1,3
1,3
1,3
1,3
1,2
1,2
1,2
1,1
1
0,9
0,8
0,8
0,8
0,7
0,7
2,9
2,8
0,6
0,6
Pot. All. Comune di Monselice
All. Comune di Montemurro (Pz)
Pot. All. Dalmine di Costa Volpino (Bg)
Pot.Spina Nord di Civitacastellana
All. Castiglione Cosentino (Cs)
All. Frasso Telesino (Bn)
All. S.Vincenzo La Costa (Cz)
Pot.Der. per Albiolo
Pot. All. 1^ Presa Com. di Magenta
All. Sant'onofrio (Vv)
Riclassamento Der.per Nogarole Rocca(Vr)
All. Sant Ilario Dello Jonio (Rc)
All. Villapiana (Cs)
All. Comune di Pietrapaola (Kr)
Pot. Deriv. per Gardone Val Trompia
All. Bucciano (Bn)
All. Calopezzati (Cz)
Pot. All. Comune di Valenzano
All. Comune di Sant'angelo Le Fratte (Pz
All. Grimaldi (Cz)
All. Comune di Aliano (Pz)
All. Domanico (Cz)
All. Forchia (Bn)
All. Dugenta (Bn)
Pot. All. Comune di Altamura
All. Platania (Cz)
All. Belsito (Cs)
All. Comune di Terravecchia (Kr)
All. Comune di Rocca di Neto (Kr)
All. Comune di Ciro'
All. Feroleto Antico (Cz)
All. Grotteria (Rc)
Pot. All. Comune di Gravina
All. Altomonte (Cs)
All. Filogaso (Vv)
All. Vaglio Basilicata (Pz)
All. Cancellara (Pz)
Pot. All. Comune di Casoria
Pot. All.Comune di Gaeta
N° 146 Allacciamenti Utenze Industriali, Termoelettrici E Civili
Pot. Teleregolazione Rete B. Piem.
Nuovo Imp. Riduz. di Robecchetto
Pot. Imp. Reg. N. 562 "La Stanga"
Pot. Imp. Rid. N. 641
Pot.Imp.Rid.N°959 S.Apollinare Q=20.000
Pot.Imp.Rid.N°789 Scandicci Sud Q=300000
Pot.Imp.Rid.N°98 Fontaniva Q=15000 M3/H
Pot.Preriscaldo Imp.Rid.786 Colle V.Elsa
Diametro
(mm)
200
100
150
100
150
100
100
250
200
100
200
100
100
100
200
100
100
150
150
100
100
100
100
100
200
150
100
100
100
100
100
100
150
100
100
100
100
200
200
Lunghezza
(Km)
0,6
0,5
0,5
0,4
0,4
0,3
0,3
0,2
0,2
0,2
0,2
0,2
0,2
0,2
0,2
0,2
0,2
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
0,1
<0,1
<0,1
<0,1
<0,1
<0,1
<0,1
<0,1
-
-
31

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