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(4) Copper pipes or pipes of other material shall comply with the requirements of the latest British standard specification for such pipes.
(5) Lead pipes will not be permitted for the conveyance of water supplied from the waterworks.
(6) The water authority shall have the right at any time to weigh, measure or otherwise test any pipes being used for an inside service or fire service to ascertain if they are up to standard.
(b) Taps, ball cocks and stop cocks.
(1) All taps, ball cocks and stop cocks shall conform to the latest standards laid down by the British Waterworks Association.
(2) Iron taps, ball cocks and stop cocks shall not be used without written permission from the water authority.
(3) Samples of taps, ball cocks and stop cocks of approved type may be seen at the waterworks workshops.
(4) No tap, ball cock or stop cock shall be used until it has been approved and stamped by the water authority. The licensed plumber shall at his own cost deliver all such fittings to the waterworks workshops and remove them after they are stamped.
(5) A fee as specified in Appendix I shall be charged for each article stamped by the water authority.
(c) Cold water cisterns.
Cold water cisterns for the storage of water supplied from the waterworks shall be watertight and have close fitting rovers which shall not be airtight. They shall be constructed of concrete, iron or other approved material. Where iron is used it shall be galvaniz ed or otherwise protected against corrosion in a manner to be approved by the water authority. Every cistern shall have a ball cock with a stop cock behind it and an overflow pipe. The ball cock shall shut off the supply when the water level is 2 inches below the over- flow pipe and the nose or outlet of the ball cock shall be above the surface of the water when the cistern is charged. The overflow pipe shall be laid to the outside of the building and shall terminate în a conspicuous position. No overflow pipe shall be conected 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) 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.
(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 losets, 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,