loss of head
loss of head
(OP)
what would cause one of our simi shrouded impeller centrifugal pumps to loose head as we go out on the flow? The test stand has been double checked and everything else with the pump seems normal.
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RE: loss of head
Do you mean it is losing more head than the curve says it should?
You're going to have to supply more information about exactly what symptoms its exhibiting, or flow, head, power consumption data to get any kind of a meaningful answer.
"I think it would be a good idea."
- Mahatma Gandhi (1869-1948),
when asked about Western civilization
RE: loss of head
RE: loss of head
Is this model significantly different than other models?
Are these flowrates higher than you've tested before?
"I think it would be a good idea."
- Mahatma Gandhi (1869-1948),
when asked about Western civilization
RE: loss of head
Thanks, I will let you know.
RE: loss of head
What do you mean by semi shrouded, is the impeller front clearance adjustable against the casing or a wearplate?
RE: loss of head
RE: loss of head
RE: loss of head
Ensure the discharge is placed below the water surface level in the holding tank so that air is not driven into the tank.
RE: loss of head
How are you measuring the head? With inlet and outlet Pressure gages and using a flow meter, yes? How are you calculating the pump's differential head exactly?
(Discharge Pressure - Suction Pressure)psig * 144/62.4
"I think it would be a good idea."
- Mahatma Gandhi (1869-1948),
when asked about Western civilization
RE: loss of head
We are subtracting the inlet conditions and taking into account the velocity head. We have inlet pressure gage, discharge pressure gage and flow meter. Hope to rerun the test Monday with the discharge moved further away.
Thanks for all the help, will let you know what happens.
RE: loss of head
"I think it would be a good idea."
- Mahatma Gandhi (1869-1948),
when asked about Western civilization