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Rajesh nagiri
Participant

Join Date: May 2012
Posts: 3

CEP

05/01/2012 11:55 AM

Dear sir,

Please confirm my doubt That the suction pressure of condensate extraction pump of a steam turbine is positive or negative pressure.

Rajesh

(inst Engineer)
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PWSlack
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United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#1

Re: CEP

05/01/2012 12:11 PM

Well, what happens in the condenser?

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Rajesh nagiri
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Join Date: May 2012
Posts: 3
#3
In reply to #1

Re: CEP

05/02/2012 7:40 AM

Dear sir,

condenser pressure is negative (-0.9kg/cm2) and why the pumps are errected in sump .

Thanking you,

With regards.

rajesh
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PWSlack
Guru
United Kingdom - Member - Indeterminate Engineering Fields - Control Engineering - New Member

Join Date: Jan 2007
Location: In the bothy, 7 chains down the line from Dodman's Lane level crossing, in the nation formerly known as Great Britain. Kettle's on.
Posts: 32175
Good Answers: 839
#4
In reply to #3

Re: CEP

05/02/2012 8:19 AM

OK. Well, that answers the originally-posted question.

Because of the low pressure, the pump suction needs to be as short as practicable. Immersing the pumps in the sump itself is about as short a suction as any designer is likely to achieve. The need for a short suction line arises as an attempt to prevent the liquid from boiling at the pumps' inlets and the effects of cavitation occurring on the pumps' impellers. Cavitation in any pump will shorten the life of the impeller appreciably.

There is a good article on cavitation in Wikipedia.

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lyn
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Join Date: Oct 2008
Posts: 42355
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#2

Re: CEP

05/01/2012 12:22 PM

I'll confirm that you appear to have a doubt.

Which do you doubt?

What do you think?

Try this:

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SJD (CEP) Vertical Condensate Extraction Pumps
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lyn (1); PWSlack (2); Rajesh nagiri (1)

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