1. The content and characteristics of the gas shall be in accordance with the values specified in the following table.
| Content or characteristic | Value |
|---|---|
| hydrogen sulphide content | ≤ 5 mg/m3; |
| total sulphur content (including H2S) | ≤ 50 mg/m3; |
| hydrogen content | ≤ 0.1% (molar); |
| oxygen content | ≤ 0.2% (molar); |
| impurities | shall not contain solid or liquid material which may interfere with the integrity or operation of pipes or any gas appliance (within the meaning of regulation 2(1) of the 1997 Regulations) which a consumer could reasonably be expected to operate; |
| hydrocarbon dewpoint and water dewpoint | shall be at such levels that they do not interfere with the integrity or operation of pipes or any gas appliance (within the meaning of regulation 2(1) of the 1997 Regulations) which a consumer could reasonably be expected to operate; |
| WN | (i)≤ 51.41 MJ/m3, (ii)≥ 47.20 MJ/m3; |
| ICF | ≤ 0.48 |
| SI | ≤ 0.60 |