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Connection facilities

GRTgaz determines and carries out the operating and preventive and corrective maintenance operations for the branch connection and injection point.


GRTgaz continuously monitors the branch connection and its entire network remotely by transmission of flow rate and pressure measurements. GRTgaz also undertakes field surveillance on foot, in vehicles and by overflying network structures.

Monitoring the injection point consists of a sensory examination (sight, hearing, etc.) intended to ensure the overall integrity of equipment for the point

  • In particular, monitoring for:
    • absence of leaks from the installation: gas smell, abnormal noises;
    • operation and overall condition of appliances
    • replacement of consumables
    • etc.

Monitoring is carried out monthly.


GRTgaz implements a voluntary inspection and repair programme for its pipelines, based on:

  • inspecting pipelines using a pig carrying instrumentation to check the integrity of the pipeline where technically feasible
  • searching and locating damage to coatings using 'surface electrical' measurements
  • analysing the efficacy of cathodic protection

Combined, these methods ensure the pipeline has a long service life.
Inspection of the Injection Point consists of a compliance test of its functional components, such as

  • Compliance test of main equipment items in the delivery point (regulators, safety valve, filters): Once or twice a year.
  • Regulatory checks:
    • VCD check (gas Volume Conversion Device): Once a year
    • Five-yearly meter check
    • Check of chromatographs: Once a year

Repair, Replacement and Renewal

GRTgaz determines and carries out the operating and corrective maintenance operations for the injection point, known as the 3R operations. These operations maintain or restore performance of appliances, valves or any other component of the injection point or local measuring device.

3 types of work may be carried out by GRTgaz:

  • Repair: Troubleshooting and repair of an appliance
  • Replacement: Standard exchange of an appliance before reaching the end of its service life
  • Renewal: At the end of the service life of an appliance or injection point, it is renewed with one having identical functionality

The price is fixed and paid as an annual fee.

Read the catalogue (in French)

To ensure it operates correctly, the injection point must be connected to the electricity supply and the public telephone network using dedicated lines. GRTgaz can provide these services on request.

These consist of:

  • Paying a standing charge for the electricity line, carrying out the associated regulatory checks and paying for the electricity consumed, necessary for the injection point to function,
  • Paying a standing charge for the telephone line and paying the call charges.

Fixed pricing is applied to these services. It is paid as an annual fee.

Read the catalogue (in French)

GRTgaz checks compliance of the biomethane with technical requirements.

These checks only cover substances that can be measured continuously using the chromatographs fitted in the injection point.

The checks are carried out on two occasions:

  • Impromptu checks, carried out throughout the entire duration of the connection and injection contract. These analyses are carried out every month during the first year and may be carried out at longer intervals depending on the results obtained during the first year.
  • Non-compliance check: these analyses are not scheduled and are mandatory if an impromptu check gives a non-compliant result.

This is a fixed price service, payable annually, based on the number of tests carried out during the past year.

Read the catalogue (in French)