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(4) Any water fitting laid below ground level shall have a depth of cover sufficient to prevent water freezing in the fitting. (3) Any concealed water fitting or mechanical backflow prevention device, not being a terminal fitting, shall be made of gunmetal, or another material resistant to dezincification.
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(2) No fitting which is designed to be operated or maintained, whether manually or electronically, or which consists of a joint, shall be a concealed water fitting. No water fitting shall be installed, connected or used which is likely to have a detrimental effect on the quality or pressure of water in a water main or other pipe of a water undertaker.ħ.-(1) No water fitting shall be embedded in any wall or solid floor. Every water fitting shall be capable of withstanding an internal water pressure not less than 1½ times the maximum pressure to which that fitting is designed to be subjected in operation.Ħ. (c) be so installed as to minimise the risk of permeation by, or deterioration from contact with, any substance which may cause contamination andĥ. (ii) inhibit damage by freezing or any other cause (b) be so constructed and installed as to– (b) be constructed of materials of such strength and thickness as to resist damage from any external load, vibration, stress or settlement, pressure surges, or temperature fluctuation to which it is likely to be subjected. (a) be immune to or protected from corrosion by galvanic action or by any other process which is likely to result in contamination or waste of water and “vent pipe” means a pipe open to the atmosphere which exposes the system to atmospheric pressure at its boundary.
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“terminal fitting” means a water outlet device and “temperature relief valve” means a valve which opens automatically at a specified temperature to discharge fluid “storage cistern” means a cistern for storing water for subsequent use, not being a flushing cistern “stopvalve” means a valve, other than a servicing valve, used for shutting off the flow of water in a pipe “servicing valve” means a valve for shutting off for the purpose of maintenance or service the flow of water in a pipe connected to a water fitting “secondary system” means an assembly of water fittings comprising the cold feed pipe, any hot water storage vessel, water heater and pipework from which hot water is conveyed to all points of draw-off “secondary circuit” means an assembly of water fittings in which water circulates in supply pipes or distributing pipes of a hot water storage system
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“primary circuit” means an assembly of water fittings in which water circulates between a boiler or other source of heat and a primary heat exchange inside a hot water storage vessel, and includes any space heating system “pressure relief valve” means a pressure-activated valve which opens automatically at a specified pressure to discharge fluid “overflow pipe” means a pipe from a cistern in which water flows only when the water level in the cistern exceeds a predetermined level “flushing cistern” means a cistern provided with valve or device for controlling the discharge of the stored water into a water closet pan or urinal “expansion valve” means a pressure-activated valve designed to release expansion water from an unvented water heating system “expansion cistern” or “expansion vessel” means a cistern or vessel connected to a water heating system which accommodates the increase in volume of water in the system when the water is heated from cold “distributing pipe” means any pipe (other than a warning, overflow or flushing pipe) conveying water from a storage cistern, or from hot water apparatus supplied from a cistern and under pressure from that cistern “contamination” includes any reduction in chemical or biological quality of water due to a change in temperature or the introduction of polluting substances “combined temperature and pressure relief valve” means a valve capable of performing the function of both a temperature relief valve and a pressure relief valve “combined feed and expansion cistern” means a cistern for supplying cold water to a hot water system without a separate expansion cistern “cistern” means a fixed container for holding water at atmospheric pressure “backflow” means flow upstream, that is in a direction contrary to the intended normal direction of flow, within or from a water fitting