Calculating the Peak Flow Rate Duty - Cold Water Booster Sets.
To calculate the likely peak demand in a boosted cold water system, use the table below, which shows the actual flow requirements for each appliance, and the likely simultaneous demand in low usage applications, normal domestic situations and higher usage commercial systems.
Examples:
Low frequency usage
Care homes for elderly persons, offices
Domestic frequency usage
Individual private residences, infant schools
Commercial frequency usage
Hotels, student accommodation, apartments
By multiplying the number of appliances by the flow figure in the relevant column, a suggested design flow rate can be established. It is important to note that there are instances where a different column must be used for a particular appliance. A sports club, for example, may need all of the showers running at once, so the figure would be the actual flow requirement multipled by the number of showers installed.
Qty
Appliance
Actual Flow Requirement (l/s)
Low Frequency Usage (l/s)
Domestic Frequency Usage (l/s)
Commercial Frequency Usage (l/s)
Peak Flow Rate Design Duty
Basin (H&C)
0.15
0.005
0.008
0.017
Sink (H&C)
0.20
0.010
0.020
0.040
Bath (H&C)
0.30
0.020
0.030
0.070
WC
0.1
0.005
0.010
0.020
Shower (std)
0.15
0.010
0.020
0.030
Shower (high flow)
0.50
0.040
0.065
0.030
Urinal
0.01
0.003
0.003
0.005
Bidet
0.08
0.002
0.003
0.004
Cleaners Sink (H&C)
0.30
0.003
0.005
0.006
Domestic Washing Machine
0.20
0.007
0.007
0.010
Commercial Washing Machine
0.30
0.020
0.030
0.060
Total (l/s)
Important note:When calculating the pressure required, it is critical to allow for the static head and outlet pressure requirements in your calculations.
Once you have worked out the total peak flow rate design duty you can use this information to specify pumping products. If you need to specify a booster set you can use our helpful four step guide -click here.
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