Technical Requirements for Plumbing Works in Buildings ...
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LIST OF SYMBOLS (1 OF 2) ANGLE VALVE LOOSE JUMPER TYPE STOPCOCK GATE VALVE I ISOLATION VALVE STORAGE CISTERN FLOAT SWITCH FLOAT OPERATED VALVE NON-RETURN VALVE I CHECK VALVE @ WATER METER DRAW OFF POINTS - COLD WATER IH \ DRAW OFF POINTS - HOT WATER DRAW OFF POINT - COLD & HOT WATER DRAIN PIPE WITH PLUG O.F. OVERFLOW PIPE PUMP SET CALORIFIER [§] BOILER A4 210x297
Transcript of Technical Requirements for Plumbing Works in Buildings ...
LIST OF SYMBOLS (1 OF 2)
ANGLE VALVE
LOOSE JUMPER TYPE STOPCOCK
GATE VALVE I ISOLATION VALVE
STORAGE CISTERN
FLOAT SWITCH
FLOAT OPERATED VALVE
NON-RETURN VALVE I CHECK VALVE
@ WATER METER
DRAW OFF POINTS - COLD WATER
IH \ DRAW OFF POINTS - HOT WATER
DRAW OFF POINT - COLD & HOT WATER
DRAIN PIPE WITH PLUG
O.F. OVERFLOW PIPE
PUMP SET
CALORIFIER
[§] BOILER
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PUMP SET
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OVERFLOW PIPE
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DRAIN PIPE WITH PLUG
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LOOSE JUMPER TYPE STOPCOCK
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STORAGE CISTERN
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FLOAT OPERATED VALVE
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FLOAT SWITCH
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WATER METER
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DRAW OFF POINTS - COLD WATER
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GATE VALVE / ISOLATION VALVE
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M
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DRAW OFF POINTS - HOT WATER
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H
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DRAW OFF POINT - COLD & HOT WATER
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P
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BOILER
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CALORIFIER
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B
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NON-RETURN VALVE / CHECK VALVE
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O.F.
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%%ULIST OF SYMBOLS (1 OF 2)
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ANGLE VALVE
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UNVENTED ELECTRIC THERMAL STORAGE WATER HEATER
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BUTTERFLY VALVE
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FLUSHING CISTERN & WATER CLOSET
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INSTANTANEOUS GAS WATER HEATER
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PRESSURE RELIEF VALVE / SAFETY VALVE
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PRESSURE REDUCING VALVE (SMALL END DENOTES LOW PRESSURE)
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CHECK METER POSITION (FOR CHECKING AND WASTE DETECTION PURPOSES)
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ANTI-VACUUM VALVE
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EXPANSION VESSEL
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C
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G
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TEMPERATURE RELIEF VALVE
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COMBINED TEMPERATURE AND PRESSURE RELIEF VALVE
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PRESSURE TYPE THERMAL STORAGE WATER HEATER
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UH
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VH
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NON-PRESSURE TYPE HEATER
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H
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BASIN
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%%ULIST OF SYMBOLS (2 OF 2)
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FIG. 3
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20mm BRASS
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LONG SCREW
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CONNECTOR
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20mm PIPE /
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ADAPTOR
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20 x 15mm
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BRASS
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REDUCING
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BUSH
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15mm
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BRASS
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PIPE
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15mm
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METER
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LEAD
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SEAL
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WIRE
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20 x 15mm
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BRASS
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REDUCING
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BUSH
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15mm
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BRASS
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PIPE
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20mm LOOSE
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JUMPER TYPE
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20mm
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PIPE /
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ADAPTOR
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1.
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ALL THREADING TO BS 21.
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METER POSITION TO BE USED FOR LINED G.I., COPPER AND THERMOPLASTIC INSIDE SERVICE.
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2.
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%%uNOTES:
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200mm METER SPACE FOR 15mm METER
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STOPCLOCK
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%%uTYPICAL INSTALLATION OF A 15mm DIAMETER WATER METER
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METER SIZE (mm)
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15
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25
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40
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%%uDIMENSION (mm)
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A
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200
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370
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421
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METER SIZE (mm)
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50
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80
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100
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%%uDIMENSION (mm)
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A
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310
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413
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483
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150
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500
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CLEAR EFFECTIVE LENGTH
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OF DISTANCE PIECE
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CLEAR EFFECTIVE LENGTH
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OF DISTANCE PIECE
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%%uMETER DIMENSIONS
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FIG. 4
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NON-AMR
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METERS
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AMR METERS
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200
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311
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346
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GOVERNMENT MAIN
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%%uLOT BOUNDARY
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C
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M
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M
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M
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N.B.
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THE CHECK METER POSITION IS PROVIDED FOR CHECKING
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LEAKAGE AND CONSUMPTION.
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GOVERNMENT MAIN
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M
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M
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M
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M
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%%UDIRECT SUPPLY (WITHOUT STORAGE TANK)
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O.F.
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%%uLOT BOUNDARY
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FIG. 5
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%%UINDIRECT SUPPLY SYSTEM (THROUGH STORAGE TANK)
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FIG. 6
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P
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P
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%%uINDIRECT SUPPLY SYSTEM
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FLOAT SWITCH
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FLOAT SWITCH
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O.F.
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O.F.
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PUMPS
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C
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CHECK METER POSITION
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GOVERNMENT MAIN
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%%uLOT BOUNDARY
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M
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M
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M
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%%uSUMP AND PUMP SYSTEM
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%%uHYDRO PNEUMATIC PUMP SYSTEM
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M
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M
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M
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C
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CHECK METER POSITION
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GOVERNMENT MAIN
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FLOAT SWITCH
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PUMPS
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O.F.
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%%uLOT BOUNDARY
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P
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P
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FIG. 6A
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G17-267_01_rev1.dwg
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SCHEMATIC DIAGRAM FOR CLEANSING (TYPE I)
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CLEANSING TAP UNDER LOCK AND KEY
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CLEANSING TAP UNDER LOCK AND KEY
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CLEANSING TAP UNDER LOCK AND KEY
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CLEANSING TAP UNDER LOCK AND KEY
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CLEANSING TAP UNDER LOCK AND KEY
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CLEANSING TAP UNDER LOCK AND KEY
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INLET
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O.F.
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M
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FIG. 6C
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G17-267_04_rev1.dwg
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SCHEMATIC LAYOUT OF HYDRO-VENT RE-CIRCULATION SYSTEM (SHEET 1 OF 2)
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O.F.
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FROM METERED WATER SUPPLY
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WATER TANK FOR HYDRO VENT
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HYDRO VENT
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FIG. 6D
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SCHEMATIC LAYOUT OF HYDRO-VENT RE-CIRCULATION SYSTEM (SHEET 2 OF 2)
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TO NEAREST
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DRAIN
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BY-PASS STOP VALVE
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WATER RETURN
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DETERGENT BOX DETERGENT TYPE : DIVERSEY VOLUME USED : 0.005 LITRE/NOZZLE/HR.
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DISCHARGE PRESSURE GAUGE W/ LOW PRESSURE ALARM OPERATING PRESSURE : ~1.5KG/CM2 SWITCH SET MINIMUM PRESSURE TO 0.5KG/CM2
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VENT-WASH
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EXHAUST HOOD
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PUMP W/ INTERLOCK TO EXHAUST SYSTEM
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STRAINER /FILTER
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REFERENCE ONLY AND THE DETAIL ARRANGEMENT SHALL BE SUBJECTED TO INDIVIDUAL DESIGN
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SOLENOID VALVE
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METAL CASING
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ANTI-DRIP
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DEVICE
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SWIVEL JOINT
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HOT-WATER
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OUTLET PIPE
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IMMERSION HEATER
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ROD THERMOSTAT
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BAFFLE
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INSULATION
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COLD-WATER INLET
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LEVEL OF
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HOT WATER
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LEVEL OF WATER
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AFTER DRAW-OFF
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%%UESSENTIAL COMPONENTS OF A NON-PRESSURE TYPE HEATER / DISPENSER
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H
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HOT WATER
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DRAW-OFF
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COLD WATER
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DRAW-OFF
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DIRECT MAINS
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SUPPLY
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%%ULAYOUT OF A NON-PRESSURE TYPE HEATER / DISPENSER
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HEATER
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%%uNON-PRESSURE TYPE HEATER
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FIG. 7
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ELECTRIC HEATING ELEMENT
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%%USECTION THROUGH A CISTERN TYPE WATER HEATER / DISPENSER
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DIRECT MAINS SUPPLY
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INTERNAL VENT PIPE
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COLD WATER FEED
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%%ULAYOUT OF A CISTERN TYPE WATER HEATER / DISPENSER
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O.F.
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H
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O.F.
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%%uCISTERN TYPE WATER HEATER
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FIG. 8
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FIG. 9
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%%uCONNECTED DIRECTLY TO MAINS SUPPLY
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G
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%%uINSTANTANEOUS GAS WATER HEATER
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%%uINSTANTANEOUS GAS WATER HEATER
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%%uCONNECTED INDIRECTLY TO MAINS SUPPLY
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O.F.
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%%uINSTANTANEOUS GAS WATER HEATER
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G
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COMBINED TEMPERATURE
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AND PRESSURE RELIEF
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VALVE (OPTION 2)
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ELECTRIC HEATING
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ELEMENT WITH
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THERMOSTATIC
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AND THERMAL
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CUT-OUT
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TEMPERATURE
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RELIEF VALVE
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(OPTION 1)
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PRESSURE
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RELIEF VALVE
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(OPTION 1)
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DIRECT WATER SUPPLY
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H
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%%uNOTES :
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2.
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3.
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THE SAFETY DEVICES ARE UNDER THE CONTROL OF THE ELECTRICAL PRODUCTS (SAFETY)
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REGULATION ADMINISTERED BY THE ELECTRICAL AND MECHANICAL SERVICES DEPARTMENT.
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EXPANSION VESSEL IS ONLY REQUIRED WHEN A NON-RETURN VALVE OR A PRESSURE
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4.
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REDUCING VALVE OF THE NON-BACKFLOW TYPE IS FITTED IN THE COLD WATER INLET.
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%%uLAYOUT OF UNVENTED ELECTRIC THERMAL STORAGE TYPE WATER HEATER
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%%uLEGEND :
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OPTIONAL
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A COMBINED TEMPERATURE AND PRESSURE RELIEF VALVE (OPTION 2) MAY BE USED
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IN LIEU OF A TEMPERATURE RELIEF VALVE AND A PRESSURE RELIEF VALVE (OPTION 1).
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THE FACTORY TEST PRESSURE OF THE HEATER SHALL BE IN EXCESS OF 1.5 TIMES
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1.
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THE MAXIMUM STATIC PRESSURE AT THE MAINS WATER SUPPLY POINT.
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EXPANSION VESSEL
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FIG. 10
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IMMERSION HEATER WITH
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SWITCH FOR 'SINK' OR
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'BATH'
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THERMOSTAT
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INSULATION
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OPEN VENT PIPE
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%%uTHERMAL STORAGE WATER HEATER
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%%uLAYOUT OF A PRESSURE TYPE THERMAL STORAGE WATER HEATER
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VH
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INLET
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OPEN VENT PIPE
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TO DRAW OFFS
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O.F.
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%%uESSENTIAL COMPONENTS OF A PRESSURE TYPE
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%%uPRESSURE TYPE THERMAL STORAGE WATER HEATER
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%%uNOTE:
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THIS TYPE OF HEATER SHALL BE SUPPLIED FROM A STORAGE CISTERN, EXCEPT IT IS
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INSTALLED IN FLATS SUPPLIED THROUGH THE INDIRECT OR SUMP AND PUMP SYSTEM.
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FIG. 11
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%%uDIRECT CENTRALISED HOT WATER SYSTEM
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INLET
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O.F.
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H
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H
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B
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COLD WATER STORAGE
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COLD FEED
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OPEN VENT PIPE
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HOT WATER
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DISTRIBUTING
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PIPE
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HOT WATER
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CYLINDER
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SECONDARY
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RETURN
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FLOW PIPE
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RETURN PIPE
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SCREW PLUG
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WITH A
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REMOVABLE
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KEY
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SAFETY
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VALVE
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BOILER
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FIG. 12
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PRIMARY RETURN
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ANNULAR
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HEATER
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FLOW
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RETURN
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OPEN VENT PIPE
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SECONDARY FLOW
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SECONDARY RETURN
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PRIMARY FLOW
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%%uESSENTIAL COMPONENT OF A CALORIFIER
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%%uINDIRECT CENTRALISED HOT WATER SYSTEM
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O.F.
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O.F.
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H
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H
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B
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FEED AND
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EXPANSION
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INLET
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CISTERN
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COLD FEEDS
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CALORIFIER
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(SEE INSET)
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SCREWED
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PLUG WITH A
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REMOVABLE KEY
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BOILER
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SECONDARY
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RETURN
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INLET
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STORAGE CISTERN
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OPEN VENT PIPES
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HOT WATER
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DISTRIBUTING
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PIPE
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SAFETY
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VALVE
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FIG. 13
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FIG. 14
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GOVT. SALT WATER MAIN
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CHECK
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GOVT. SALT WATER MAIN
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CHECK METER POSITION
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P
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METER
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POSITION
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C
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C
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O.F.
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O.F.
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O.F.
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P
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DUPLICATE PUMPS
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%%uLOT BOUNDARY
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%%uLOT BOUNDARY
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%%uSALT WATER FLUSHING SUPPLY SYSTEM
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INDIRECT SALT WATER FLUSHING SUPPLY SYSTEM (WITH DIRECT SUPPLY TO ROOF STORAGE TANK)
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INDIRECT SALT WATER FLUSHING SUPPLY SYSTEM (WITH SUMP AND PUMP SYSTEM)
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FIG. 15
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%%uNOTES :
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1.
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VOLUME BELOW LEVEL 'X' FOR MAINS FRESH WATER STORAGE
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SHALL BE APPROVED BY WATER AUTHORITY.
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2.
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OVERFLOW SHALL BE TWICE THE DIAMETER OF LARGEST INLET
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OR 40mm DIAMETER WHICHEVER BE THE GREATER.
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3.
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MATERIALS USED SHALL BE CAPABLE OF WITHSTANDING THE
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CORROSIVE ACTION OF SALT WATER.
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%%UFLUSHING SUPPLY STORAGE CISTERN - MIXED SUPPLY
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(NOT TO SCALE)
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PIVOT PIN
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SPLIT PIN
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%%uDETAIL 'C'
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WASHERS
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%%uMAINS FRESH WATER
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%%uMAINS FRESH WATER
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%%uSECTION B-B
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%%uSECTION A-A
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%%uPLAN
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A
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B
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B
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SUPPLY FROM
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WELL OR NULLAH
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MAINS FRESH WATER INLET VALVE
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AIR PIPE
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LEVEL 'X'
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T.W.L.
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%%UALTERNATIVE WATER SOURCE
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FLUSHING/SUPPLY
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POINT(S)
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WASHOUT
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OVERFLOW
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GUIDE RINGS
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SUBMERGED
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FLOAT CONTROL
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GUIDE
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RINGS
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LEVEL 'X'
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ADJUSTING
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NUTS
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VALVE TO BE 100mm
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ABOVE OVERFLOW
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BOTTOM OF INLET
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T.W.L.
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MAINS FRESH WATER INLET
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DETAIL 'C'
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OVERFLOW
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OUTLET
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WASHOUT
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BALL VALVES
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OVERFLOW
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4.
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THIS DRAWING IS EXTRACTED FROM W1543/5B.
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A
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OUTLET TO
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FIG. 16
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%%uLAYOUT DRAWING FOR SPRINKLER SYSTEM
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O.F.
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O.F.
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P
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G/F
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ROOF
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F
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SUMP
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TANK
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%%uLOT BOUNDARY
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PUMPS
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SPRINKLER
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INLET
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PUMPS
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SPRINKLER
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TANK
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SPRINKLER HEAD
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P
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C
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F
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F
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F
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F
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F
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F
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F
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F
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F
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P
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P
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P
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F
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PRESSURE SWITCH
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FOR PUMP STARTING
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ARRANGEMENT
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SUBSIDIARY
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STOP VALVE
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FIG. 17
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%%uLAYOUT DRAWING FOR IMPROVISED SPRINKLER SYSTEM
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G/F
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F
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ADDITIONAL BUTTERFLY VALVE WITHOUT
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STOP SCREW AND LOCK NUT ON HANDLE
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AND STRAPPED IN OPEN POSITION
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CONTROL VALVE
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CHECK METER HOUSED
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IN METER BOX
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FIRE SERVICE
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INLET
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%%uBOUNDARY
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C
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%%uLOT
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TEST VALVE
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SPRINKLER HEAD
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SUBSIDIARY
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STOP VALVE
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%%uLAYOUT DRAWING FOR FIRE HYDRANT/HOSE REEL SYSTEM
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FIG. 18
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P
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P
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B
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C
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B
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B
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B
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B
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B
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B
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B
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B
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B
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B
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P
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P
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G/F
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ROOF
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O.F.
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FIRE SERVICES
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INLET
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TO DRAIN
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PUMPS
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SUMP
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TANK
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%%uLOT BOUNDARY
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PUMPS
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FIRE HOSE REEL
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FIRE
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HYDRANT
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FIRE SERVICE TANK
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O.F.
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FIG. 19
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A
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FOR ROADS (SUCH AS DISTRICT AND LOCAL DISTRIBUTOR ROADS,
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RURAL ROADS B AND FEEDER ROADS) WITH FOOTWAY ONLY AND
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WITHOUT VERGE, HYDRANTS CAN BE ERECTED CLOSER TO THE
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EDGE OF THE CARRIAGEWAY BUT NOT LESS THAN 200mm FOR
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ANY PART OF THE INSTALLATIONS. FOR ROADS WITH A SPEED
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LIMIT OF 70km/h OR ABOVE. STRICT COMPLIANCE WITH THE
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REQUIREMENTS OF THE ABOVE TABLE IS REQUIRED.
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>50 AND <80
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>80
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%%uNOTES :
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<50
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600
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1000
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500
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600
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1000
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600
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OR
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TOWARDS HYDRANT
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AWAY FROM HYDRANT
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BUT NOT STEEPER
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THAN 2.5%
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DESIGN
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SPEED
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CARRIAGEWAY
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(IN km/h)
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AND STEEPER
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THAN 2.5%
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TOWARDS HYDRANT
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WHERE CARRIAGEWAY CROSS FALL IS
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MINIMUM CLEARANCE FROM KERB LINE (IN mm)
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CONCRETE THRUST BLOCK TO BE
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CAST AGAINST UNDISTURBED GROUND
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D.I. DOUBLE
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SOCKET
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90%%d BEND
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DN 150 D.I. COLLAR
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WITH MECHANICAL JOINT
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DN 150 GATE VALVE
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(CONTROL VALVE)
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DN 150 FLANGED
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SPIGOT PIECE
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KERB LINE
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CLEARANCE FROM
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KERB LINE
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(SEE TABLE BELOW)
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DN 150 D.I. PIPE
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DN 150 D.I. COLLAR
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WITH MECHANICAL JOINT
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DN 150 FLANGED
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SPIGOT PIECE
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TEE PIECE WITH
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FLANGED BRANCH
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DN 150 GATE VALVE
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(ISOLATION VALVE)
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A
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%%uLAYOUT PLAN OF THE TYPICAL INSTALLATION
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%%uOF DN 150 STREET FIRE HYDRANT
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200
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mm
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200
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mm
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x 750mm HIGH
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CONC. THRUST BLOCK
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600mm x 900mm
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FIG. 20
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FINISHED ROAD LEVEL
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%%uNOTES :
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1.
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THE CAP OF THE CONTROL VALVE SPINDLE SHOULD BE AT 250mm APPROX. BELOW THE VALVE COVER AND IN NO CASE
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%%uSECTION OF THE TYPICAL INSTALLATION OF DN 150 STREET FIRE HYDRANT
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SHOULD THE DISTANCE BE MORE THAN 500mm.
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D.I. FLANGE SPIGOT
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D.I. COLLAR WITH
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MECHANICAL JOINT
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D.I. COLLAR WITH
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MECHANICAL JOINT
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DN 150 GATE
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VALVE CHAMBER
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CONCRETE THRUST BLOCKS
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C.I. DOUBLE
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FLANGED 90%%d
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DUCKFOOT BEND
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C.I. DOUBLE
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FLANGED
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DISTANCE
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PIECES
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C.I. FLANGE
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SPIGOT
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C.I. ROUND HEAD FIRE HYDRANT
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285mm x 200mm C.I. SURFACE BOX
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TO BE DETERMINED
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ON SITE
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130
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mm
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APPROX.
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750 mm
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1000 mm
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%%uSECTION A - A
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FIG. 21
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C
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P
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P
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O.F.
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G.L.
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S.F.H.
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S.F.H.
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PUMP ROOM
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%%ULAYOUT DRAWING FOR STREET FIRE HYDRANT SYSTEM
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%%uABBREVIATION :
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S.F.H. STREET FIRE HYDRANT
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ROOM/CABINET
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CHECK METER
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DISCHARGE AT
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CONSPICUOUS
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LOCATION
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VALVE
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PIT
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%%uNOTES :
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1.
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A BYPASS ARRANGEMENT WITH THE PROVISION OF A SECOND PRESSURE REDUCING VALVE
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TO ENABLE ISOLATION OF ANY DEFECTIVE PRESSURE REDUCING VALVE FOR REPAIR AND
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2.
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THE PRESSURE REDUCING VALVES FOR USE WITH FRESH WATER SHOULD BE MANUFACTURED
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FROM MATERIALS SUITABLE FOR USE IN CONTACT WITH POTABLE WATER.
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3.
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THE PRESSURE REDUCING VALVES FOR USE WITH SALT WATER SHOULD BE MANUFACTURED
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FROM MATERIALS CAPABLE OF WITHSTANDING THE CORROSIVE EFFECT OF SALT WATER.
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REPLACEMENT IS USED.
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%%USCHEMATIC LAYOUT OF PRESSURE REDUCING VALVES
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TO INSIDE SERVICES
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WATER SUPPLY
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FROM GRAVITY
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TANK / PUMP
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PRESSURE GAUGE
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PRESSURE GAUGE
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FIG. 22
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(ONE DUTY, ONE BY-PASS)
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FIG. 23
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M
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SOIL
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LEVEL
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LOT
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BOUNDARY
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%%UWATERING FLOWER BEDS PLUMBING SYSTEM
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WP1
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WP2
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WP3
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WP4
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WP5
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%%uABBREVIATION :
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WP WATER POINT
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METER BOX
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FIG. 24
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GOVERNMENT WATER MAIN
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(WATER MAIN TO BE LAID AND MAINTAINED BY `AGENT')
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M
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LOT BOUNDARY
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BY GOVERNMENT)
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LAID AND MAINTAINED
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(WATER MAIN TO BE
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MASTER METER
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%%UTYPICAL CONFIGURATION OF MASTER METER AND SUB-METER CHAMBERS
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%%UIN MULTIPLE-BLOCK DEVELOPMENT
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M
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M
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FW
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TMF
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M
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LEGEND :
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S
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CHECK METER POSITION IN SUB-METER CHAMBER / BOX / CABINET
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MASTER METER
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C
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CHECK METER POSITION IN BUILDING BLOCK
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NOTES :
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SUB-METER CHAMBERS FOR FIRE SERVICE NOT SHOWN FOR CLARITY
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1.
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BLOCK TYPE #1
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BUILDING
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C
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BLOCK TYPE #1
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BUILDING
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C
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S
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BLOCK TYPE #3
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BUILDING
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C
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S
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S
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S
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S
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BUILDING BLOCK
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TYPE #2
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C
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C
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C
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C
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C
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C
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C
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C
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C
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C
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C
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C
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BUILDING BLOCK
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TYPE #2
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SUB-METER CHAMBERS NOT REQUIRED FOR TMF
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2.
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ADDITIONAL SUB-METER
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CHAMBER TO BE PROVIDED
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ON BUILDING-CLUSTER BASIS
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FIG. 25
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DETAILS OF SUB-METER CHAMBER
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%%UPLAN OF TYPICAL SUB-METER CHAMBER
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C
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PROTECTION AGAINST CORROSION (NOTE 2)
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FLANGE OR SCREW JOINT WITH PROPER
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380
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80
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310
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50
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400
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100
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MIN. WORKING
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MAX PIPE DIAMETER
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CLEARANCE L (mm)
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(mm)
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FLOW
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NOTES :
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DETAILS OF THE CHAMBER SIMILAR TO WASTE DETECTION CHAMBER AND SHALL BE REFERRED TO WSD STANDARD DRAWING 1.32.
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1.
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700
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MIN. DISTANCE BETWEEN CENTRELINE OF PIPE
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AND INTERNAL WALL FACE D (mm)
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PROTECTION TO FLANGE JOINT / COUPLING / ADAPTOR SHALL BE PROVIDED USING PETROLEUM ANTICORROSION TAPES
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2.
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WITH PRIMER AND MASTIC FILLER.
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S.S. CATLADDER
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FIG. 26
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%%UFRONT ELEVATION OF MASTER METER ROOM
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F.G.L.
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DOOR
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50 x 50 CHAMFER
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REVISED ARRANGEMENT OF MASTER METER ROOM (SHEET 1 OF 5)
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FIG. 27
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%%USECTIONAL PLAN OF MASTER METER ROOM
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A
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A
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B
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VALVE SUPPORT
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FALL
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WATER DISCHARGE FACILITY
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B
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FLANGE ADAPTOR
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DOOR OPENING
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FW
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Y-TYPE STRAINER
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MASTER METER
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FLANGE ADAPTOR
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FS
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Y-TYPE STRAINER
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MASTER METER
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VALVE SUPPORT
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FLANGE ADAPTOR
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TMF
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Y-TYPE STRAINER
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MASTER METER
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REVISED ARRANGEMENT OF MASTER METER ROOM (SHEET 2 OF 5)
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%%USECTION A - A OF MASTER METER ROOM
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REMOVABLE
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MASTER METER
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UNIVERSAL BEAM
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BLINDING CONCRETE
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DIAMETER OF PIPE
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VALVE SUPPORT
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VALVE SUPPORT
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SAME SIZE AS METER
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200 x 150
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CONCRETE BLOCK
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F.G.L.
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FIG. 28
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REVISED ARRANGEMENT OF MASTER METER ROOM (SHEET 3 OF 5)
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FIG. 29
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%%USECTION B - B OF MASTER METER ROOM
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BLINDING CONCRETE
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50 x 50
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12 H.R.
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DOOR
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THROATING
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CHAMFER
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UNIVERSAL BEAM
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REMOVABLE 200 x 150
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CONCRETE BLOCK
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F.G.L.
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REVISED ARRANGEMENT OF MASTER METER ROOM (SHEET 4 OF 5)
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FS
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FW
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TMF
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GENERAL ARRANGEMENT OF MASTER METER ROOM (SHEET 5 OF 5)
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SIZE
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(mm)
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DIMENSIONS
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A
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B
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UPSTREAM
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50
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50
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310
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100
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483
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80
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413
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100
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350
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80
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350
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50
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300
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450
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METER TYPE
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ULTRASONIC
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TURBINE / WOLTMANN
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SINGLE JET
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%%uMASTER METER OF VARIOUS SIZES
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UNIVERSAL BEAM(S) SHALL BE ABLE TO LIFT UP 2.5 TIMES THE WEIGHT OF THE METER AS ADVISED BY WATER AUTHORITY.
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IN PARTICULAR, THE REQUIREMENT RELATED TO INSTALLATION OF METER AS SPECIFIED IN CHAPTER 3.
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THIS SET OF DRAWINGS SHALL BE READ IN CONJUNCTION WITH THE TECHNICAL REQUIREMENTS FOR PLUMBING WORKS IN BUILDINGS.
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PRODUCT HAVING EQUIVALENT FUNCTIONS OR PERFORMANCE INSIDE THE ROOM.
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ALL NEWLY LAID WATER MAINS MUST BE CLEANED AND STERILIZED BEFORE THE INSTALLATION OF SPECIFIED METER OR
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DRAIN PIPE FOR METER ROOM SHALL BE PROVIDED.
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THE CENTRE-LINE OF THE PIPEWORK MUST BE HORIZONTAL.
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ALL DIMENSIONS ARE IN MILLIMETRES.
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5.
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7.
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6.
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3.
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NOTES :
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4.
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2.
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1.
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DIMENSION `A' AND 'B' SHOWN IN THE TABLES ARE FOR INDICATION ONLY, EXACT DIMENSION TO BE DETERMINED ON SITE.
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WHERE TMF SUPPLY IS GIVEN, A COMMUNAL TMF METER SHALL BE PROVIDED TO EACH INDIVIDUAL BLOCK OF BUILDING.
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8.
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(mm)
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DOWNSTREAM
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720
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730
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450
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450
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720
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730
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5D
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2D
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3D
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2D
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250
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450
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200
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520
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150
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500
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900
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980
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900
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300
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500
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1000
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5D
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2D
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50
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200
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100
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250
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80
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200
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ELECTROMAGNETIC
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450
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720
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730
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250
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450
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200
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350
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150
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300
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300
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500
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1000
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3D
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2D
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1000
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1000
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1000
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200
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STRAIGHT PIPE LENGTH REQUIREMENT
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MASTER METERS FOR SIZE OF FRESH WATER SUPPLY MAIN NOT EXCEEDING 100mm IN DIAMETER COULD BE HOUSED IN
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9.
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A BOX OR CABINET INSTEAD OF IN A ROOM OR CHAMBER. FIG. 31 SHALL BE REFERRED FOR DETAILS OF MASTER METER BOX AND
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CABINET.
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FIG. 30
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FIG. 31
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GATE VALVE
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LOOSE JUMPER STOPCOCK
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NON-RETURN VALVE
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LEGEND :
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STRAINER
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DETAILS OF MASTER METER BOX AND CABINET
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%%UELEVATION FOR TYPICAL MASTER METER CABINET
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%%UFOR PIPE DIAMETER 50mm TO 100mm
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MAX. 1500
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METER CABINET
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INTERNAL FACE OF
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F.L.
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%%UELEVATION FOR TYPICAL MASTER METER BOX
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%%UFOR PIPE DIAMETER 40mm OR BELOW
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M
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MAX. 1500
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F.L.
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800
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25
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700
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15
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900
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40
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MIN. LENGTH OF
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PIPE DIAMETER
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METER BOX (mm)
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(mm)
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1000
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80
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670
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50
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1040
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100
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MIN. LENGTH BETWEEN GATE VALVE
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PIPE DIAMETER
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AND NON-RETURN VALVE (mm)
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(mm)
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M
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MASTER METER
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MASTER METER
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MIN. 300 &
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MIN. 300 &
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FIG. 32
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GATE VALVE
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LOOSE JUMPER STOPCOCK
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NON-RETURN VALVE
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LEGEND :
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DETAILS OF SUB-METER BOX AND CABINET
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%%UELEVATION FOR TYPICAL SUB-METER CABINET
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%%UFOR PIPE DIAMETER 50mm TO 150mm
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MAX. 1500
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METER CABINET
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INTERNAL FACE OF
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F.L.
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%%UELEVATION FOR TYPICAL SUB-METER BOX
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%%UFOR PIPE DIAMETER 40mm OR BELOW
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C
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MAX. 1500
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F.L.
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800
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25
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700
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15
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900
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40
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MIN. LENGTH OF
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PIPE DIAMETER
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METER BOX (mm)
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(mm)
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770
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80
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450
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50
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855
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100
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MIN. LENGTH BETWEEN GATE VALVE
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PIPE DIAMETER
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AND NON-RETURN VALVE (mm)
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(mm)
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1235
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150
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C
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CHECK METER
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CHECK METER
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MIN. 300 &
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MIN. 300 &
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FIG. 33
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FIG. 34
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FIG. 35
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SUSPENSION NOTICE OF FRESH WATER SUPPLY/ TEMPORARY MAINS WATER FOR FLUSHING
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NOTE: WHEN REPLACEMENT OF MASTER METER FOR FIRE SERVICE IS REQUIRED, A COPY OF ABOVE SUSPENSION NOTICE SHOULD BE SENT TO FIRE SERVICE COMMUNICATION CENTRE OF FIRE SERVICES DEPARTMENT (FAX NO.: 2311 0066).
