The quality specifications of the gas introduced into the Gas System are set out in the Detailed Protocol 01 "Measurement, Quality and Odorization of gas" according to the Resolution of 22nd September 2011 which modifies the detailed protocol mentioneda above.
Capacities are expressed under the reference conditions [ GCV at 0ºC; V (0ºC, 1.01325 bar)]. According to Annex J of ISO 6976 the factor applied for converting GCV from 0ºC to 25ºC shall be 1 / 1.0026.
The following table lists the quality specifications established in the detailed protocol that are to be met by any gas introduced in the gas system's entry points must meet are set out in the following table.
|H2S + COS (as S)||mg/m3||-||15|
|RSH (as S)||mg/m3||-||17|
|H2O (dew point)||ºC at 70 bar (a)||-||+2|
|HC (dew point)||ºC at 1-70 bar (a)||-||+5|
|Dust/ particles||-||Technically pure||Technically pure|
In addition to the features shown above, the gas from unconventional sources, such as biogas, gas from biomass or other types of gas produced by microbial digestion processes must comply with the quality specifications in the following table.
|Methane (CH4)||mol %||95||-|
|Halogenated compounds: Fluoride/ Chlorine||mg/m3||-||10/1|
|Benzene, Toluene, Xylene (BTX)||mg/m3||-||500|
|Dust/ particles||-||Technically pure|
In the case of biogas, biogas injection will be accepted in the network with a content of O2 of up to 0.3 mol % provided that the following conditions are met simultaneously at the injection site: