Pump Performance Curve

Yosri AB · May 20, 2021, 04:14

Hi,
Urgent ! need help

I'm working on a centrifugal pump, the goal is to evaluate the performance curve of the pump (i.e head vs flow rate) now, i started by using a Total pressure inlet (0 atm) and a mass flow outlet and by changing the desired outflow i would just simply calculate the delta p based on that flow rate and deduce the elevation ..however, i was told that i need to do the opposite thing, meaning that i have to impose a head value and then evaluate the out flow as a result .
the problem is I can't find a way to impose that condition, let's say that i need to find out the flow rate of the pump at a total head = 30 m ..how can use that 30 m to determine the pressure needed at the outlet since i have no information about the flow velocity

any suggestions please ??
Thank you

LuckyTran · May 20, 2021, 14:44

You can do it either way, you get a fan curve regardless.

If you can convert deltaP into a head you can go backwards and convert a 30 m head back into deltaP no? Where are you stuck? A velocity isn't needed to go from elevation head to pressure head.

May 20, 2021, 04:14	Pump Performance Curve	#1
Yosri AB New Member Yosri Abdallah Join Date: May 2021 Posts: 4 Rep Power: 4	Hi, Urgent ! need help I'm working on a centrifugal pump, the goal is to evaluate the performance curve of the pump (i.e head vs flow rate) now, i started by using a Total pressure inlet (0 atm) and a mass flow outlet and by changing the desired outflow i would just simply calculate the delta p based on that flow rate and deduce the elevation ..however, i was told that i need to do the opposite thing, meaning that i have to impose a head value and then evaluate the out flow as a result . the problem is I can't find a way to impose that condition, let's say that i need to find out the flow rate of the pump at a total head = 30 m ..how can use that 30 m to determine the pressure needed at the outlet since i have no information about the flow velocity any suggestions please ?? Thank you

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May 20, 2021, 14:44		#2
LuckyTran Senior Member Lucky Join Date: Apr 2011 Location: Orlando, FL USA Posts: 5,675 Rep Power: 66	You can do it either way, you get a fan curve regardless. If you can convert deltaP into a head you can go backwards and convert a 30 m head back into deltaP no? Where are you stuck? A velocity isn't needed to go from elevation head to pressure head.