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seoulres
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Join Date: Sep 2010
Posts: 11

Power Plant Condensate Pump

06/15/2011 9:11 PM

Dear all,

Please help me to understand the following:

In the P&ID of a condensate pump, there is a pipeline from the pump casing back to the upper part of the condenser (there is another separate pipeline for minimum circulation flow). Could someone please expain the function of this pipeline.

Thanks!
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Pathfinder Tags: Condensate pump
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Tornado
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#1

Re: Power Plant Condensate Pump

06/15/2011 9:51 PM

One purpose it could serve is venting vapor from the pump, allowing condensate to enter the pump before starting it.

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sv13
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#3
In reply to #1

Re: Power Plant Condensate Pump

06/17/2011 12:06 AM

That's right, condensate pump suction operates at vacuum conditions handling saturated liquid, any vapor formation and in-lakeges from pumps seals needs to be vented back to consdenser on continuous basis.

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ducon
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#2

Re: Power Plant Condensate Pump

06/16/2011 12:23 AM

Venting the flash steam that will develop after 80C and as Tornodo said.

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Patrick1
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Join Date: Jun 2011
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#4

Re: Power Plant Condensate Pump

06/17/2011 8:05 AM

I believe it is for steam turbine flexible exhaust boot cooling.

Pat Reilly

Bechtel Power
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tquad
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#5

Re: Power Plant Condensate Pump

06/18/2011 2:21 AM

If the min circulation line you refer to, is from the discharge line ( and not from the casing) then I may attempt to answer.
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Mukesh0861
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#6

Re: Power Plant Condensate Pump

06/18/2011 4:56 AM

Condensate pumps in power plants operaes with vacumme in the condenser. The line from casing to condenser help in intial venting of pump while starting. Some vapours may form initially which if not vented from the casing may cause vaapour lock in the pump and pump may fail to pump the fluid.

Minimum circulation line is from the discharge of the pump, which is used initially to develop full pressure of the pump discharge at which main check valve gets opened allowing discharge of condensate and to avoid high shut off pressure of the pump in case of closed discharge valve while pump is in operation.
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vsar
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#7

Re: Power Plant Condensate Pump

06/18/2011 10:57 AM

It may also serve a purpose ensuring the pump will not run dry of condensates.

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