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flow rate of a pump

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rish916

Mechanical
Joined
Aug 23, 2016
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guys,
if we know the kilowatt of the water pump how we calculate the flow rate of the pump??????????????
 
Do you have data sheet on the motor and flow curve for the pump?
Otherwise it is just a guess.

= = = = = = = = = = = = = = = = = = = =
P.E. Metallurgy, Plymouth Tube
 
If you work backwards in the pump power calculation, you may develop an estimate of flow.

1 HP hour = 0.746 kilowatt hour

Typical combined motor and pump efficiency = 62.4%

hp_z8vltn.png
 
As bimr says.

First you need to know the DIFFERENTIAL pressure or head of the pump, not just its output pressure.

Then it's a bit of a guess as the efficiency. The small units ( 1-2 kW or less), sometimes have combined efficiencies of 40% or less.

The nameplate on the pump normally tells you all or just google the type of pump.

Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
If you know the pressure across the pump and the power being used, using the calc.given by bimr-you could make a very wild guess as to the flowrate, bear in mind that it might be a meaningless crazy answer.

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
 
5 gallon buckets are also effective.
 
"5 gallon buckets are also effective."

But we're all assuming it's a small pump. It could be a 500kW pump - who knows?

It could be a PD piston pump - who knows?

rish916 - do you know??



Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
 
Sometimes it beats me why we even answer such questions, you would think we had nothing to do 😊

It is a capital mistake to theorise before one has data. Insensibly one begins to twist facts to suit theories, instead of theories to suit facts. (Sherlock Holmes - A Scandal in Bohemia.)
 
1 horsepower = 0.746 kilowatt (NOT kilowatt-hour)
 
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