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Water Demand

This document calculates the total water demand for a private residential building with various plumbing fixtures. It lists the fixture types and quantities, assigns fixture unit weights for cold and hot water, and calculates the total fixture units. The total fixture units are used to determine the peak water demand, mean water demand, required overhead tank size, and necessary transfer pump capacity.

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Nghia
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908 views1 page

Water Demand

This document calculates the total water demand for a private residential building with various plumbing fixtures. It lists the fixture types and quantities, assigns fixture unit weights for cold and hot water, and calculates the total fixture units. The total fixture units are used to determine the peak water demand, mean water demand, required overhead tank size, and necessary transfer pump capacity.

Uploaded by

Nghia
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as XLS, PDF, TXT or read online on Scribd
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TOTAL DEMAND CALCULATION : FOR , NNH

Fixtures type : private


Weight in Fixture units Total weight in fixture units
FIXTURES Quantity
Cold Hot Total Cold Hot Total
Water closet (flush valve) 6 0 6 0 0 0 0
Water closet (flush tank) 3 0 3 8 24 0 24
Water Bidet 0.75 0.75 1 0 0 0 0
Hose for W.C 0.75 0.75 1 0 0 0
Lavatory (& H.B., J.S.) 0.75 0.75 1 10 7.5 7.5 10
Service sink 1.5 1.5 2 0 0 0
Shower 1.5 1.5 2 1 1.5 1.5 2
Bath tub 1.5 1.5 2 3 4.5 4.5 6
Kitchen sink 1.5 1.5 2 1 1.5 1.5 2
Dishwashing machine 0 1 1 1 0 1 1
Laundry 1.5 1.5 2 1 1.5 1.5 2
Ablution (Public) 1 1 1.5 0 0 0
Urinal (1" flush valve) 10 0 10 0 0 0
Urinal (3/4" flush valve) 5 0 5 0 0 0
Urinal (flush tank) 3 0 3 0 0 0
Total Fixture Units 40.5 17.5 47
WATER DEMAND ( GPM ) 25.0 GPM 12.5 GPM 27.8 GPM
WATER DEMAND ( m3/ h ) 5.68 m3/h 2.84 m3/h 6.31 m3/h

Assuming Peak factor : 1.5


Duration : 60 min

The mean demand 18.5 gpm (mean demand = peak demand / peak factor )
Overhead tank size 556 gallon ( Overhead tank size = (peak demand - mean demand) x duration }
2.10 m3

Transfer pump capacity 18.5 gpm ( Transfer pump capacity = mean demand , Assuming one pump
4.21 m3/h running & one standby)
1.17 l/s

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