Pump Head Calculations
Pump Head Calculations
(OP)
I am trying to find the minimum flow rate for a set of Sour Water Pumps that have been in existence for some time in the refinery. I have two pump curves. One is the performance curve from the vendor which shows various impeller sizes, hp, etc.. and the second is a characteristic / test curve for the current impeller size of the pump, head and efficiency. Readings for the same capacity from both curves yields different avail. head readings. The test curve gives less head than the performance curve at the same capacity. Which curve should I be using??





RE: Pump Head Calculations
Offshore Engineering&Design
RE: Pump Head Calculations
RE: Pump Head Calculations
RE: Pump Head Calculations
I assume you want the head for a certain flow and not at zero flow (shut off pressure) at zero flow you can compare if it is as the test curve or the vendor curve.
If you mean the pump minimum flow that below it the pump should not be operated it is specified in vendor's data sheet it is not part of the curve.
regards,
roker
RE: Pump Head Calculations
Many people will tell you 20% or some such percentage of BEP as a rule of thumb for the minimum flow BUT the only way to be sure is to ask the manufacturer as it is based on a number of factors.
RE: Pump Head Calculations
RE: Pump Head Calculations
Rember the upstream process may be just athe hieght of the liquid over the pump suction or it may be the process operating presssure +/- liquid height.