Regulation 14 Amendment of Schedule 3I1

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”;

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

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

after that entry insert—

“

RD

≤0.700

”;

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

omit the entry for “ICF”;

omit the entry for “SI”;

omit sub-paragraph (b);

after that sub-paragraph insert—

“(c)

RD ≤0.700”;

omit the definition of “C₃H₈”;

omit the definition of “equivalent mixture”;

omit the definition of “ICF”;

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;”;

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

for the definition of “MJ/ m³” substitute—

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

omit the definition of “N₂”;

omit the definition of “PN”;

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;”;

omit the definition of “SI”;

for the definition of “WN” substitute—

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

$$gross calorific value÷\sqrt{relative density}$$

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