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Transport system safety

The whole Teréga Transport Grid is interconnected with the adjacent transport grids and the natural gas underground storage and production sites. It is kept at optimum working pressure by 6 compression stations, whose power consumption for gas compression can be as high as 36 MW. Because of their power, some of these installations have to be declared to the authorities under French ICPE environmental protection law (Barbaira, Mont, Lussagnet, Sauveterre de Guyenne).

Transmission pipelines are regulated by the Decree of 5 March 2014, as modified, which sets out the regulations on transmission pipelines for combustible gases, liquid or liquefied hydrocarbons and so-called “multi-fluid decree” chemical products. That decree specifies the technical requirements which gas transport systems must fulfil: pipelines and associated installations (compression stations, shut-off points, delivery points).

Controlling transport risks

Risk control starts with risk identification and evaluation work at the design stage, right through to operation of the installation.

  • Risk identification and evaluation is part of the research into hazards:

- a generic study on the risks associated with the 5,100 km Transport Grid must be carried out every five years. The most recent was performed in 2014 and submitted to the government departments. It shows the risks across the whole Teréga grid, along with preventive and protective measures in place. Alongside it, there is a long-term programme to implement compensatory measures to increase the safety of systems in areas which have seen new urban development. Every year, land owners in the most exposed areas and the communities located in the vicinity of our structures receive a letter informing them about the structures present and the required conduct: declaration of works, easements, etc.

- as part of planning for construction or modification of pipelines or associated installations, a hazard study is conducted in order to identify and analyse risks. It sets out and justifies the steps taken to reduce the possibility and impact of accidents. In particular, it sets out the arrangements made at the system’s design (compensatory measures) and operating stages. This can be used to update the generic network hazard study.

  • Actions to prevent and deal with accidents are organised through a safety management system (SGS) applied by the operator, Teréga. This SGS it's subject to internal monitoring and regular inspection by the Regional Directorate of the Environment, Development and Housing (DREAL).
  • In order to ensure that its systems are operated under optimal safety conditions, Teréga has introduced activities to inspect and modernise its infrastructures through its monitoring and maintenance plan (PSM).
  • Teréga stands prepared for any accident which may occur across its network, conducting regular exercises covering its monitoring and intervention plans (PSI), and involving the emergency services. Those emergency plans set out the organisation, intervention methods and resources to be implemented by the operator and the emergency services in the case of an accident on Teréga’s Transport Grid, enabling their actions to be coordinated. 

Increasing security to reduce the risk of a third party breaking through pipelines

Collisions during work carried out by third parties represent the highest level of industrial risk. This is therefore a constant concern for Teréga. A policy aimed at preventing accidents caused by third parties has been introduced, including special protective measures.

  • 40,000 indicator posts and bollards along pipelines help mark out the grid and provide a physical identification of the Teréga network. They are subject to constant checking from the air and on foot;
  • the thickness of the pipes is generally greater than required by the regulations in rural area, thus anticipating increased urbanisation, and the same is true in areas where there is a high level of work;
  • pipelines installed after 2006 are buried to a depth of 1.2 m, which is greater than the minimum depth specified by the regulations;
  • additional protection for pipelines has been installed where they cross roads, railways, rivers and streams.

Each year, Teréga responds to more than 20.000 requests of planning applications (DT) and work notifications (DICT), and monitors thousands of worksites close to its systems. When projects for public access buildings for more than 100 people are located nearby to its works, Teréga conducts a risk analysis, which is forwarded to the authorities and the departments responsible for issuing planning permits.

Map of installations

Map of installations

List of Teréga territories operating in the 15 departments of the South West

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