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in the machine manual or motor plate
water flow rate per second
For domestic water pump,you shall calculate the building water demand such as fixture units and other
Calculate the loading unit for each type of system required convert this loading unit into equivalent GPM this is very clear its lifting pump which is sewage pump and booster for water supply in further into the matter refer to Uniform plumbing code book .
You have to define the water demand in your building in order to calculate the pump GPM.
Gpm must be calculated via system design criterias depen on NFPA or etc.
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