NPSH,HEAD and EFFICIENCY relation
NPSH,HEAD and EFFICIENCY relation
(OP)
Hello,
It can be said generally; when NPSH decrease, HEAD increase and EFFICIENCY increase or that case could be changed accordingly
Thank you
It can be said generally; when NPSH decrease, HEAD increase and EFFICIENCY increase or that case could be changed accordingly
Thank you





RE: NPSH,HEAD and EFFICIENCY relation
Last one it depends on where you are on the pump curve and where your duty point is with respect to efficiency.
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: NPSH,HEAD and EFFICIENCY relation
image_source: http://petrowiki.org/File%3AVol3_Page_243_Image_00...
RE: NPSH,HEAD and EFFICIENCY relation
Any pump curve will generally answer all relevant questions.
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: NPSH,HEAD and EFFICIENCY relation
RE: NPSH,HEAD and EFFICIENCY relation
NPSHR is a number obtained by throttling the inlet valve until the differential head reduces by 3%. Cavitation can start some distance in head above that, hence why I reproduced the curve I did to show the difference between NPSHR and onset of cavitation.
The 3% figure is IMHO, somewhat arbitrary, but vendors like it because it is something they can test quite easily and accurately, whereas onset of cavitation is very difficult to test for.
If you're not at or close to the pump BEP, then be cautious about using the bare NPSHR figure
Remember - More details = better answers
Also: If you get a response it's polite to respond to it.
RE: NPSH,HEAD and EFFICIENCY relation
RE: NPSH,HEAD and EFFICIENCY relation
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: NPSH,HEAD and EFFICIENCY relation
RE: NPSH,HEAD and EFFICIENCY relation
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.)