How to Determine Min/Normal/ Max Flow Rate Cetrifugal Pump Fl
How to Determine Min/Normal/ Max Flow Rate Cetrifugal Pump Fl
(OP)
I've got manufacturer pump curve. I'd like to know how to determine min/normal/max flow rate from the pump curve. It is a Centrifugal pump, BEP is given at 150 GPM. If we say 150 GPM is the capacity of the pump, what would be the min and normal flow rate (to produce pump data sheet)? Thanks for your response!





RE: How to Determine Min/Normal/ Max Flow Rate Cetrifugal Pump Fl
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.)
RE: How to Determine Min/Normal/ Max Flow Rate Cetrifugal Pump Fl
The manufacturer will confirm if the pump is capable of these conditions.
RE: How to Determine Min/Normal/ Max Flow Rate Cetrifugal Pump Fl
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.)
RE: How to Determine Min/Normal/ Max Flow Rate Cetrifugal Pump Fl
however if you re-phrase this a bit and say, If I've got a pump with a BEP of 150 GPM, what are its realistic max and min flow rates, then in the total absence of real data ( the pump curve) then my finger in the wind guess is
Max flow - about 180 to 200
Min flow normally about 30% of BEP, so say 40-50 GPM
As I said - total and utter guesswork. Max flow is usually limited by end of curve / NPSH / max power of the motor issues. Min flow is the inner re-circulation which is always a bit of a vague guess, even by the vendor.
Note we often get questions here about why XYZ pump doesn't work very well and 99% of the time it's because the pump is the wrong size for the duty. So get the right pump for your duty first and foremost.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.