flow rate of a pump

[rish916]

guys,
if we know the kilowatt of the water pump how we calculate the flow rate of the pump??????????????

 

[EdStainless]

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

 

[bimr]

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%

 

[LittleInch]

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.

 

[Artisi]

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.)

 

[DubMac]

5 gallon buckets are also effective.

 

[LittleInch]

"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.

 

[Artisi]

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.)

 

[choack]

1 horsepower = 0.746 kilowatt (NOT kilowatt-hour)