Suction pressure less than vapor pressure
Suction pressure less than vapor pressure
(OP)
Hi guys,
we are looking to buy a new horizontal overhung centrifugal pump and one of the suppliers have sent us the datasheet of a pump which puts the suction pressure at 0.30 barg, maximum suction pressure at 0.8 barg, and the vapor pressure of the liquid at 0.6 barg.
Now we know that if the suction pressure is less than the vapor pressure of the liquid being pumped then it would cause cavitation in the pump. So that means that there will be cavitation issues in the pump unless I am overlooking something???. I just wanted to confirm before I write back to the manufacturer.
Thanks guys.
we are looking to buy a new horizontal overhung centrifugal pump and one of the suppliers have sent us the datasheet of a pump which puts the suction pressure at 0.30 barg, maximum suction pressure at 0.8 barg, and the vapor pressure of the liquid at 0.6 barg.
Now we know that if the suction pressure is less than the vapor pressure of the liquid being pumped then it would cause cavitation in the pump. So that means that there will be cavitation issues in the pump unless I am overlooking something???. I just wanted to confirm before I write back to the manufacturer.
Thanks guys.





RE: Suction pressure less than vapor pressure
RE: Suction pressure less than vapor pressure
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: Suction pressure less than vapor pressure
What are the suction pressures on the pump design from other suppliers?
RE: Suction pressure less than vapor pressure
I don't understand this.
What is suction pressure and what is "maximum" suction pressure? have you given a range of suction pressure to the mfr.?
also why are we not talking "NPSHa; NPSHr" at the location and the point of service where the criteria for cavitation effectively applies?
RE: Suction pressure less than vapor pressure
RE: Suction pressure less than vapor pressure
RE: Suction pressure less than vapor pressure
I suggest you review whatever data was supplied to the vendor in the first place.