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Dear All,
Usually in closed drain systems we use submersible centrifugal vertical pumps inside of closed drain drums.This is a typical example.My question is :How can we calculate NPSH of drum pump for a submersible one?
Thanks in advance.
Best Regards.
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Npsh Calculation-special Case
Started by jprocess, Dec 17 2006 07:49 AM
4 replies to this topic
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#2
Art Montemayor
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Posted 17 December 2006 - 07:41 PM
jprocess::
A centrifugal pump has the same NPSHA as a conventional centrifugal pump. It follows the same basic requirements and equation. Refer to the attached little note I prepared for entry plant engineers as a short seminar on NPSHA to find out how to calculate the answer. There is nothing "special" about this pumping operation. It follows the same rules as all others.
Always apply engineering logic and common sense when doing this simple arithmetic operation. Remember that if the source tank is not vented to the atmosphere and is not positively pressurized, it will create its own partial vacuum as the liquid is being evacuated --- making it differentially tougher and tougher for the pump to have a positive NPSHA. Unless you break this partial vacuum, you may be unable to pump all the liquid out. You say that the drum is “closed”, so I have to assume this means hermetically closed.
Arts_NPSH_Tutorial.doc 167KB
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#3
Nirav
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Posted 17 December 2006 - 09:08 PM
QUOTE (jprocess @ Dec 17 2006, 09:49 PM) <{POST_SNAPBACK}>
Dear All,
Usually in closed drain systems we use submersible centrifugal vertical pumps inside of closed drain drums.This is a typical example.My question is :How can we calculate NPSH of drum pump for a submersible one?
Thanks in advance.
Best Regards.
Usually in closed drain systems we use submersible centrifugal vertical pumps inside of closed drain drums.This is a typical example.My question is :How can we calculate NPSH of drum pump for a submersible one?
Thanks in advance.
Best Regards.
Jprocess,
Refer to attached article. It would make your doubts very very clear.
Refer to page 8 & 9 to get answer of your particular question.
Thank you,
#4
rosa
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Posted 18 December 2006 - 02:08 AM
Hi friends,
I also calculated the present NPSH for our TEG pump(reciprocating pump).It is in the attached file.hope it would be useful.
It should be noted that inaccording its data sheet the requierd NPSH=9.5 m and the available Npsh=12 m.
Kind regards,
Rosa
I also calculated the present NPSH for our TEG pump(reciprocating pump).It is in the attached file.hope it would be useful.
It should be noted that inaccording its data sheet the requierd NPSH=9.5 m and the available Npsh=12 m.
Kind regards,
Rosa
#5
ravi.s
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Posted 29 August 2007 - 03:09 AM
Hi Rosa,
As I understand you have attached file for NPSH for TEG, I cant find any! am I missing some thing.
Ravi
As I understand you have attached file for NPSH for TEG, I cant find any! am I missing some thing.
Ravi
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