Differential Pressure
Differential Pressure
(OP)
I received a datasheet with suction pressure the same as minimum, rated, and maximum. However the discharge pressure is different for all the min/rated/max pressure. For the same fluid and shaft speed, can the differential pressure be different?





RE: Differential Pressure
You've "received" it. For what purpose?
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Differential Pressure
RE: Differential Pressure
RE: Differential Pressure
Positive Displacement Pumps (piston, screw, diapharm etc) are essentially "constant" flow pumps whereby the flowrate only vares a small amount for quite a wide variaiton in outlet pressure.
Centrifugal pumps work on differential head so if the inlet pressure goes up, the discharge head goes up by a simialr amount for the same flowrate.
If you posted the data sheet we might be able to help you a bit more, but I hope this gives you something to work with as it's a pretty vague question at the moment.
My motto: Learn something new every day
Also: There's usually a good reason why everyone does it that way
RE: Differential Pressure
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: Differential Pressure
If the difference in the DP is very wide range, a positive displacement pump or a centrifugal pump with VFD may be selected.
RE: Differential Pressure
Independent events are seldomly independent.