【法规名称】
【法规编号】 79817 什么是编号？
【正 文】
第12页 CAP 102A WATERWORKS REGULATIONS
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[接上页] 6. An overflow pipe of one commercial size larger than the inlet pipe, and in no case less than 25 mm diameter, shall be fitted to each cistern and shall be extended to terminate in a conspicuous position. No overflow pipe shall be connected to a drain, sewer or to the overflow pipe from any other cistern. 7. A stop valve shall be provided on the outlet of every cistern and provision shall be made for a drain-off pipe to enable the cistern to be emptied. 8. No cistern for the storage of fresh water supplied from the waterworks shall, without the written permission of the Water Authority, be so connected that it can be used for the storage of any water other than that supplied from the waterworks. 9. Every cistern shall be installed so that it is easily accessible for cleaning or repair. Where a cistern is installed inside a building and, due to limited headroom available, it is fixed with limited clearance from the ceiling or underside of the roof, a quickly detachable fitting must be used to enable it to be easily removed for cleansing and repair. 10. Safe access shall be provided to all cisterns by means of a secure permanent ladder or readily available portable ladder. (L.N. 252 of 1977) PART IV WATER HEATERS 1. (1) Subject to subparagraph (2), a water heater shall be supplied with water from a cold water storage cistern. (2) The following type of water heaters may, with the written permission of the Water Authority, be connected direct to a main- (a) non-pressure type water heaters where no restriction of flow can be effected beyond the inlet control valve; (b) cistern type water heaters; (c) instantaneous water heaters where the guaranteed test pressure of the water heater is at least 1 1/2 times the static head available at the water heater; (d) unvented thermal storage type electric water heaters which comply with the safety requirements under the Electrical Products (Safety) Regulation (Cap 406 sub. leg.). (L.N. 106 of 1999)(3) Where a water heater is connected direct to a main- (a) every draw-off point of the water heater shall be not less than 15 mm above the lowest part of the top edge of the receptacle supplied from the water heater; (b) if it is a water heater burning gas, the construction of the water heater shall be such that no leakage of gas into the water can occur; (c) if it is a water heater using electricity, the construction of the water heater shall be according to the relevant British Standards. 2. Where mixing valves, showers or water blenders are installed, the cold water supply to these fittings shall be from the same cold water storage cistern or main that supplies the water heater and the installation shall be such that the hot water flow will stop before that of the cold water in the event of a failure in the water supply. 3. Every water heater of the thermal storage type, other than an electric water heater of the type specified in paragraph 1(2)(d), shall be provided with an individual expansion pipe taken from its highest point and shall continuously rise without obstruction until it discharges to atmosphere above the storage cistern at a sufficient height to prevent a constant out-flow of hot water therefrom. (L.N. 286 of 1990) 4. 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 repair) 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. 5. No tap used for the purpose of drawing hot water shall be fixed at a greater distance (measure along the axis of the pipe by which the tap is supplied) from a water heater or hot water cistern, cylinder or tank, or from a flow and return system, than the distance appropriate to the largest internal diameter of any part of the said pipe as shown in the following table- TABLE Largest internal diameter of pipe Distance in metres (a) Not exceeding 20 mm .................................................. (b) Exceeding 20 mm but not exceeding 25 mm .................. (c) Exceeding 25 mm ........................................................ 12 8 3 6. A loose jumper type valve shall be fitted on the inlet of every water heater if a non-return valve is not incorporated in such water heater; but this requirement does not apply to an electric water heater of the thermal storage type that is not provided with an individual expansion pipe. (L.N. 286 of 1990) 7. Pipes used for conveying hot water shall be of galvanized steel, copper, or of some corrosion-resisting alloy: Provided that cast iron pipes of not less than 50 mm internal diameter may be used if suitable provision for their expansion is made. (L.N. 320 of 1992) 8. Every hot water cylinder or tank of a capacity of not less than 100 litres shall- (a) if made of mild steel, comply with the requirements for cylinders or tanks, as the case may be, of BS 417, Part 2 for galvanized mild steel cisterns, tanks and cylinders; and (L.N. 106 of 1999) |
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