Gas quality

View the quality specifications for gases introduced at the entry points of the Gas System.

(*) According to the Resolution of 21 December 2012, amending detailed protocol PD-01 on “Measurement, Quality and Odorisation of Gas,” of the Rules on the Technical Management of the Gas System.

Tables expressed in the following reference conditions: [0ºC; V (0ºC: 1.01325 bar)].

Capacities are expressed under the following reference conditions: [GCV at 0ºC; V (0ºC, 1.01325 bar)]. As per Annex J of the ISO 6976 standard, the factor to be applied to convert the GCV from 0ºC to 25ºC is 1/1.0026.

In the case of biogas, this will be accepted with an O₂ content of up to 0.3 mol % provided that the following circumstances are present at the injection point:

1. CO₂ content must at no point exceed 2 mol %.
2. The dew point for water must at no point exceed negative eight degrees centigrade (-8ºC).
3. The volume of biogas injected into the trunk transmission network must never exceed 5,000 m³/h (under benchmark conditions). For greater volumes - and in any event for the remaining points of entry to the gas system - the maximum volume of injection for biogas will be determined for each specific case, based on the quality and volume of gas transported through the network in question, by the network owner, and reported to the Directorate General for Energy Policy and Mines, to the GTS and the National Energy Commission.