Paragraph 1 I1

England, Wales and Scotland

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	F1≤1.0% (molar), where the gas is conveyed in a pipe operated at a pressure of ≤38 barg, and ≤0.2% molar, where the gas is conveyed in a pipe operated at a pressure of >38 barg;
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 F2the 1998 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 F3the 1998 Regulations) which a consumer could reasonably be expected to operate;
F4RD	≤0.700
WN	(i) ≤51.41 MJ/m³, and (ii) F5≥46.50 MJ/m³;
F6...	...
F7...	...

Annotations

F1: Words in Sch. 3 Pt. 1 table substituted (6.4.2023) by The Gas Safety (Management) (Amendment) Regulations 2023 (S.I. 2023/284), regs. 1(3), 14(2)(a)(i)
F2: Words in Sch. 3 Pt. 1 table substituted (6.4.2023) by The Gas Safety (Management) (Amendment) Regulations 2023 (S.I. 2023/284), regs. 1(3), 14(2)(a)(ii)
F3: Words in Sch. 3 Pt. 1 table substituted (6.4.2023) by The Gas Safety (Management) (Amendment) Regulations 2023 (S.I. 2023/284), regs. 1(3), 14(2)(a)(iii)
F4: Words in Sch. 3 Pt. 1 table inserted (6.4.2023) by The Gas Safety (Management) (Amendment) Regulations 2023 (S.I. 2023/284), regs. 1(3), 14(2)(a)(iv)
F5: Words in Sch. 3 Pt. 1 table substituted (6.4.2025) by The Gas Safety (Management) (Amendment) Regulations 2023 (S.I. 2023/284), regs. 1(2), 14(2)(a)(v) (as amended by S.I. 2023/320, regs. 1, 2)
F6: Words in Sch. 3 Pt. 1 table omitted (6.4.2023) by virtue of The Gas Safety (Management) (Amendment) Regulations 2023 (S.I. 2023/284), regs. 1(3), 14(2)(a)(vi)
F7: Words in Sch. 3 Pt. 1 table omitted (6.4.2023) by virtue of The Gas Safety (Management) (Amendment) Regulations 2023 (S.I. 2023/284), regs. 1(3), 14(2)(a)(vii)