Plumbing

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Plumbing Part 1 water systems and pipe
material SW Wong MIOP, RP
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• Water Source for Hong Kong
• Water From Guangdong
• Main Source
• Rain Water
• From Rainwater Collection Area
• Well
• Used in Remote Area

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• Flushing Water Source for Hong Kong
• Sea Water
• Main Source
• Fresh Water
• No sea water supply for some area
• Well
• Used in Remote Area

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Water Connection to Plumbing System
Rainwater Collection
Reservoir
Water from Guangdong
Water Treatment Plant
Distributed Reservoir
Distributed Reservoir
Distributed Reservoir
Consumers
Consumers
Consumers
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• Type of Plumbing System
• - Cold water supply system
• - Hot water supply system
• - Surface water drainage above ground
• Foul water drainage above ground
• Drainage below ground

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• Cold Water Supply System
• Direct System water is distributed by means of
  reservoir head
• b. Indirect System water is collected in sump
  tank and pump
• to storage tank
  where water is distributed
• by gravity.
• c. Booster Pump System - used in low pressure
  area.

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• Hot Water System
• Centralised System - water is heated and stored
  centrally and distributed throughout the building
  by means of pipeworks.
• b. Localised Water Heating System - supply of hot
  water by localised systems use electric or gas
  water heater sited either directly over the
  fitting being supplied.

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Surface Drainage Above Ground Collecting
rainwater onto the roof of building and
discharging it away to the underground drainage
system outside the building. Foul Drainage
Above Ground Collecting soil, waste, and
ventilation pipework and fittings in the
building. It functions to convey discharges from
appliance to underground drains and can be
arranged in three different ways two-pipes,
one-pipe and single-stack systems.
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• Drainage Below Ground
• Separated System is used in Hong Kong
• Drain collecting rainwater and discharged to
• nullah and river.
• b. Sewer - collecting foul water and discharged
  to
• wastewater treatment plant in
  cities

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Materials for Potable Water Supply

• Ductile Iron Pipe to BS 4772
• Copper pipe to BS 2871
• Polyethylene (PE) pipe to BS 6370 or BS 6572
• Stainless steel pipe to BS 4127
• PB pipe to BS 7291 Pt 1 2
• Lined (uPVC / Polyethylene lining) GI Pipe
  approved type
• PEX pipe to BS7291 Pt 1 3

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• Pipe Material for Flushing Water Supply
• Cast Iron Pipe to BS 4622
• uPVC pipe to BS 3505 Class D E
• PVC-C (Chlorinated) Pipe to BS 7291 Pt. 1 4
• Ductile Iron Pipe to BS 4772 (cement lining)

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• Pipe Material for Drainage Above Ground
• Cast Iron Pipe to BS 416
• uPVC pipe to BS 4514 / BS 5255 / AS 1415
• Pipe Material for Drainage Below Ground
• Cast Iron Pipe to BS 437 / BS 1211
• Concrete Pipe
• French Red Pipe
• Vitrified Clay Pipe