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Composition and pressure of gas to be supplied.
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2.—(1) Where an order under this Act has been made affecting any undertakers, the gas supplied by those undertakers, in addition to conforming to the conditions prescribed in the order, shall comply with the following conditions, that is to say:—
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(i) it shall not contain any trace of sulphuretted hydrogen when tested in accordance with this Act;
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(ii) it shall be supplied at not less than the minimum permissible pressure:
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Provided that the foregoing requirements shall not apply as respects a separate supply of gas by any undertakers for industrial purposes only, but an order may impose such other conditions with regard to gas supplied by those undertakers for those purposes as appear necessary to the Board of Trade.
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(2) The minimum permissible pressure shall be such pressure in any main, or in any pipe laid between the main and the meter having an internal diameter of two inches and upwards, as to balance a column of water not less than two inches in height, except as may be otherwise provided by the order relating to any undertaking, and different minima may be specified for different parts of an undertaking, or for gas of different calorific values.
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(3) Where any undertakers are, at the time when an order is made with respect to them under this Act, under a statutory obligation to comply with conditions in relation to pressure which are in excess of the provisions as to pressure contained in this section, the order shall make such provisions as appear necessary to the Board of Trade for preserving these conditions, and this Act shall, in its application to those undertakers, have effect as though such last-mentioned provisions were substituted for the provisions of this section as to pressure.
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(4) The Board of Trade shall, as soon as may be after the passing of this Act, cause inquires to be held into the question whether it is necessary or desirable to prescribe any limitations of the proportion of carbon monoxide which may be supplied in gas used for domestic purposes, and into the question whether it is necessary or desirable to prescribe any limitations of the proportion of incombustible constituents which may be supplied in gas and may, if on any such inquiry it appears desirable, make one or more special orders under this Act prescribing the permissible proportion in either case, and any such special order may have effect either generally or as regards particular classes of undertakings, and the provisions of the special order shall have effect as if they were enated in this section.
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