Regulation 9 Uniformity of calorific value

Where a public gas transporter has made or adopted a declaration of calorific value under regulation 8(1) above, he shall secure that any average calorific value of the gas conveyed to any take off point situated in the area in respect of which the declaration is made or adopted and while it has effect during any gas period of three months commencing on 1st January, 1st April, 1st July or 1st October in any year is not less than that declared calorific value.

For the purpose of paragraph (1) above, an average calorific value of such gas means the value given by adding the average of the calorific values of the gas on each of not less than any six different gas days in any such gas period and dividing the sum by the number of those gas days, but so that any amount of less than 0.1 megajoules in any average shall be ignored.