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Hot and Cold Water Pipes Sizing

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The table below can be used to determine the maximum numbers of draw offs served by a pipe:

Hot and Cold Water Pipes Sizing
Nominal bore of pipeMaximum number of draw offs served
Flow pipesReturn pipes
inSteel pipe
Copper pipe
Head up to
20 m
(70 ft)
Head over
20 m
(70 ft)
1/2 15 15 1 1 - 2 1 - 8
3/4 20 22 2 - 4 3 - 9 9 - 29
1 25 28 5 - 8 10 - 19 30 - 66
1 1/4 32 35 9 - 24 20 - 49 67 - 169
1 1/2 40 42 25 - 49 50 - 79 170 - 350
2 50 54 50 - 99 80 - 153
2 1/2 65 67 100 - 200 154 - 300
  • Basins, sinks, showers and similar are regarded as 1 draw off
  • Baths and similar are regarded as 2 draw offs
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Related Topics

Water Systems

Design of hot and cold water service and utility systems with properties, capacities, sizing of pipe lines and more.

Related Documents

Cold Water Storage per Occupant

Cold water storage for occupants in common types of buildings as factories, hospitals, houses and more

Domestic Hot Water Service Systems - Design Procedures

Design procedures for domestic hot water service systems.

Domestic Service Water Supply Systems

Introduction to general design of domestic service water supply systems - with pressurized or gravity tanks.

Fixtures - Hot Water Content

Content of hot water in some common used fixtures - basins, sinks and baths.

Hot Water Circulation System - Return Pipes

Hot water can be circulated through a return pipe if it's instantly required at the fixtures.

Hot Water Consumption vs. Occupants

Consumption of hot water per person or occupant.

PVC Pipes Schedule 40 - Friction Loss vs. Water Flow Diagrams

Friction loss (psi/100 ft) and velocity for water flow in plastic PVC pipe schedule 40.

Water Distribution Pipes - Materials

Materials used in water distribution pipes.

Water Service Pipe Lines

Water service pipe lines extends from the potable water source to the interior of buildings.

Water Supply Fixture Units - WSFU vs. GPM and Liters/sec

Converting WSFU - Water Supply Fixture Units - to GPM.

Water Supply Fixture Units WSFU

WSFU is used to calculate water supply service systems.

Water Supply Pipe Lines - Sizing

Sizing of water supply pipe lines.

Water Supply Public Buildings

Required water supply to public buildings.

Water Supply Systems - Online Design Application

Free online tool for designing water supply systems in buildings.

Yard Fixtures - Water Consumption

Water consumption in garden fixtures.

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