The Gas Safety (Management) (Amendment) Regulations 2023

Amendment of Schedule 3

14.—(1) Schedule 3 (content and other characteristics of gas) is amended as follows.

(2) In Part 1—

(a) in the table following paragraph 1—

(i) in the entry for “oxygen content”, for “≤0.2% (molar)” substitute “≤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”;

(ii) in the entry for “impurities”, for “the 1994 Regulations” substitute “the 1998 Regulations”;

(iii) in the entry for “hydrocarbon dew point and water dewpoint”, for “the 1994 Regulations” substitute “the 1998 Regulations”;

(iv) after that entry insert—

“RD

≤0.700”;

(v) in the entry for “WN”, for “≥47.20 MJ/m³” substitute “≥46.50 MJ/m³”;

(vi) omit the entry for “ICF”;

(vii) omit the entry for “SI”;

(b) in paragraph 3, for “the 1994 Regulations” substitute “the 1998 Regulations”;

(c) in paragraph 4 omit sub-paragraph (2).

(3) In Part 2—

(a) in paragraph 1—

(i) omit sub-paragraph (b);

(ii) after that sub-paragraph insert—

“(c) RD ≤0.700”;

(b) in paragraph 2 omit sub-paragraph (2).

(4) In Part 3—

(a) in paragraph 1—

(i) omit the definition of “C₃H₈”;

(ii) omit the definition of “equivalent mixture”;

(iii) omit the definition of “ICF”;

(iv) after that definition insert—

““gross calorific value” means the gross calorific value, expressed in MJ/ m³, of a dry gas determined on the basis that the water produced by combustion is assumed to be condensed;”;

(v) in the definition of “mg/m³” for “at 15C and 1.01325 bar” substitute “under the reference conditions”;

(vi) for the definition of “MJ/ m³” substitute—

““MJ/ m³” means megajoules per cubic metre under the reference conditions;”;

(vii) omit the definition of “N₂”;

(viii) omit the definition of “PN”;

(ix) for the definition of “relative density” substitute—

““relative density” (“RD”) means the ratio of VG to VA (expressed in the same units) where—

• VG is the mass of a volume of the gas when containing no water vapour under the reference conditions; and

• VA is the mass of the same volume of air containing no water vapour under those conditions;”;

(x) omit the definition of “SI”;

(xi) for the definition of “WN” substitute—

““WN” means the Wobbe Number of the gas, which is calculated in accordance with the following formula—

”;

(xii) omit “trigonometric functions are to be evaluated in radians.”;

(b) after paragraph 1 insert—

“1A.   In this Schedule, the reference conditions are 15C and 1.01325 bar.”;

(c) omit paragraph 2.