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Water Supply Lines - Sizing

Sizing water supply service and distribution lines based on Water Supply Fixture Units (WSFU).

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Due to intermittent use of the fixtures in a water supply system it can be difficult to predict and size the supply and service lines. The fixtures total theoretical demand should always be compensated with a statistic more expected demand.

With the Water Supply Fixture Units (WSFU) system defined by the Uniform Plumbing Code (UPC) there are tables available where the total demand calculated by adding each units "Water Supply Fixture Units" (WFSU) are compensated to an expected demand.

The tables below can be used to size building supply and branch lines and meter and service lines.

Supply pressure 30 - 45 psi

Maximum Water Supply Fixture Units (WSFU)
Meter and street service lines (inches)	Building supply and branch lines (inches)	Length of pipe (feet) Load Calculator!
Meter and street service lines (inches)	Building supply and branch lines (inches)	40	60	80	100	150	200
3/4	1/2	6	5	4	3	2	1
	3/4	19	16	14	12	9	6
	1	29	25	23	21	17	15
1	1	36	31	27	25	20	17
1	1 1/4	54	47	42	38	32	28

Supply pressure 45 - 60 psi

Maximum Water Supply Fixture Units (WSFU)
Meter and street service lines (inches)	Building supply and branch lines (inches)	Length of pipe (feet) Load Calculator!
Meter and street service lines (inches)	Building supply and branch lines (inches)	40	60	80	100	150	200
3/4	1/2	7	7	6	5	4	3
	3/4	20	20	19	17	14	11
	1	39	39	36	33	28	23
1	1	39	39	39	36	30	25
1	1 1/4	78	78	76	67	52	44

Supply pressure over 60 psi

Maximum Water Supply Fixture Units (WSFU)
Meter and street service lines (inches)	Building supply and branch lines (inches)	Length of pipe (feet) Load Calculator!
Meter and street service lines (inches)	Building supply and branch lines (inches)	40	60	80	100	150	200
3/4	1/2	7	7	7	6	5	4
	3/4	20	20	20	20	17	13
	1	39	39	39	39	35	30
1	1	39	39	39	39	38	32
1	1 1/4	78	78	78	78	74	62

1 in = 25.4 mm

The tables can be used for pipe lines but for special equipment like manifolds etc. a table or formula converting the WSFU to water flow should be used for proper sizing.

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Related Topics

Water Systems - Hot and cold water service systems - design properties, capacities, sizing and more.

Related Documents

ASME B31.9 Building Services Piping - Working Pressure and Temperature Limits - The working pressure and temperature limits of ASME Code B31.9 - Building Services Piping.
ASTM F876 - PEX Tube - Dimensions - Dimensions of PEX tubes.
BS 7291 - Thermoplastics Pipes for Hot and Cold Water - Dimensions - Dimensions of thermoplastic pipes - PEX and PB according BS 7291.
Cold Water Dwelling Storage Capacity - Required cold water dwelling storage capacity - commonly used fixtures and types of buildings.
Cold Water Storage per Occupant - Cold water storage for occupants in common types of buildings as factories, hospitals, houses and more
PE Water Supply Pipes - Properties - Nominal pipe size, outside diameter, wall thickness, weight and working pressure.
Plumbing Codes - Plumbing or sanitation codes are a set of rules and regulations imposed by cities, counties or states.
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 - Calculating Demand - Calculating expected demand for water supply service lines.
Water Supply - Cross-Contamination Control - It is fundamental to keep the potable water in the water supply systems uncontaminated.
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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