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• For hot & cold-water distribution systems-CPVC water pipe & tubing ,. Cast iron fittings up to & including Slmm in size, when used in connection with potable water piping shall be galvanized. ,. All small-sized malleable iron water fittings shall be galvanized. "" Water pipes & fittings with a lead content that exceed 8% shall be prohibited & shall not be used in potable piping systems. 5. VALVES ,. Valves up to & including Slmm size shall be brass or other approved materials. Sizes over Slmm may have cast iron or brass bodies. Each gate valves shall be a fullway type with working parts of non-corrosive materials. Prcpar('d by: . .Jrch Enp Emmanuel ( ·. Val'ld. RI. IR.\IP. l'lhl' l-l
NATIONAL PLUMBING CODE OF THE PHILIPPINES , A valve used to control two (2) or more openings shall be a fullway gate valve. 6. GRAVITY SUPPLY TANKS ,. Covers of gravity tanks shall be vented with a return-bent vent pipe having an area not less than the area of the down-feed riser pipe. ~ For overflow control, inlets shall be controlled by a float valve, float switch or electrode-type water level control. , Shall have a valved drain pipe & an screened overflow pipe 7. WATER PRESSURE, PRESSURE REGULATORS & PRESSURE RELIEF VALVES ,. Inadequate water pressure -water pressure less than 103 Kpa ,. Excessive water pressure -water pressure greater than 551 Kpa , All pipe determinations shall be based on eighty percent (80%) the reduced pressure. ;,. For listed non-storage instantaneous heaters having an inside diameter of not more than 76mm is not required to have pressure relief valve with approved drain. , Each pressure relief valve shall be an approved automatic type with drain, & each such relief valve shall be set at a pressure not more than 1033 Kpa. r approved Combination Temperature & Pressure Relief Valve (CT & PRV) 8. INSTALLATION, INSPECTION, & TESTING , All water service yard piping shall be at least 0.3m below the finish ground level. , Water pipes if run or laid with the same trench or building sewer shall be: • Min. of 0.3m above the top sewer or drain line (may be constructed of day or materials no approved for use within a building) • Placed on a solid shelf excavated on one side with min. of 0.3m clearance from the side of sewer, drain line & the water line :,.. Unions shall be installed in the water supply piping within 0.3m away from regulating equipment, water heater, conditioning tanks & similar equipment which require removal for servicing or replacement. 9. SIZE OF POTABLE WATER PIPING , "Size of water piping shall be based on the total water demand" , The quantity of water required to be supplied to every plumbing fixture shall be represented by "Fixture Units" (FU) ,. 61m max. length of supply piping. ,. No building water service pipe shall be less than 19mm in diameter. 10. EQUIVALENT WATER SUPPLY FIXTURE UNITS (some) ITEM Number of Water Supply NO.