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surface of the water when the cistern is charged. The overflow pipe shall be laid to the outside of the building and shall terminate in a conspicuous position. No overflow pipe shall be connected to a drain, sewer, or to the overflow pipe from any other cistern. Cisterns shall be placed in such positions that they are easily accessible for clean- ing. The water authority shall in all cases decide the maximum capacity of cistern permissible.
(d) Hot water apparatus.
(1) Except with the written permission of the water authority all hot water apparatus such as geysers, engines or other appliances in which water supplied from the waterworks is heated shall be fed from a cold water cistern and shall not be connected directly to the main. The supply pipe from the cold water cistern shall feed the hot water apparatus only.
(2) If the cold water for such apparatus is supplied from a cold water cistern which is used for other purposes no pipe other than the connexion to the hot water apparatus shall draw water from the lower half of such cistern.
(3) Hot water cylinders shall be constructed of galvanized iron or other approved material, tested to double the normal working pressure, and adequately supported. No tap or other means of drawing off water (other than a screwed plug with a removable key for emptying the system for cleansing or repairs) shall be connected to any part of the hot water system below the top of the hot water cylinder in such a way that the level of the water in the cylinder can be lowered. Every cylinder shall have an expansion pipe which shall be carried up and bent over the cold water cistern so that the open end of the pipe shall be above the surface of the water when the cistern is charged.
(4) Hot water apparatus generally shall conform to the standards laid down for the time being by the British Waterworks Association.
(e) Flushing apparatus.
(The following standards apply only in cases where permission has been granted under regulation 18 to use water supplied from the waterworks for flushing water closets, latrines and urinals.)
(1) Every water closet, latrine and urinal shall be provided with a flushing cistern made of cast iron or other suitable approved material.
(2) Flushing cisterns for water closets shall be capable of giving a flush of not less than 2 gallons nor more than 3 gallons of water.
(3) The tail pipe and flush pipe of flushing cisterns for water closets shall have an internal diameter of not less than one and one quarter inches,
(4) Every flushing cistern shall have an overflow which shall terminate in a conspicuous position.
(5) Every flushing cistern shall have a ball cock of such design as to allow the cistern to fill rapidly but shall shut off the supply when the water level reaches a level one inch below the overflow. The nose or outlet of the ball cock shall be above the surface of the water when the cistern is charged. A stop cock shall be fixed behind the ball cock.
(6) Every flushing cistern shall have an efficient waste-prevent- ing device of the valveless type.
(7) The siphon (or dome and discharge pipe as the case may be) of every flushing cistern shall either be of corrosion-resisting material or be efficiently protected against corrosion.
(8) Every flushing cistern shall be so constructed that water cannot flow down the flush pipe except when a flush is being properly delivered, and so that it shall not discharge at one flush more than its nominal capacity.
(9) In the case of latrines or urinals the capacity of the flushing cistern shall be decided by the water authority.
(10) Flushing apparatus shall be operated by hand, except in cases where written permission from the water authority has been granted for the installation of automatic flushing. In such cases the amount and frequency of the flushes shall be decided by the water authority,
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