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nadeem arshad
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Join Date: Aug 2012
Posts: 1

Steam Condenser Measurement

08/28/2012 12:33 PM

Plant steam condenser is showing condenser vacuum = -86 kPa. However steam condensate temperature in condenser hotwell is 38 degree celcius. In steam table, saturation pressure against 38 degree celcius is ~ 6.6 kPa. According to steam table, condenser pressure should be (101-6.6 =94.4 kPa) or vacuum should be -94.4 kPA. Condensate temperature in condenser hotwell has been verified by other temperature instruments installed in condensate loop and it is confirmed that temperature is 38 degree celcius. Condenser vacuum has also been recalibrated by two different calibraters and every time found the same vacuum i.e -86 kPa.

Can any one diagnose the problem and help to resolve it ?
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Crabtree
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#1

Re: Steam Condenser Measurement

08/28/2012 4:10 PM

You've got non-condensibles in the steam, Guvnor - about 8.4kPa-worth. Fix the leak.

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energygod
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#2
In reply to #1

Re: Steam Condenser Measurement

08/29/2012 1:41 AM

Could be a DA problem-

Check your vent stack and see if you are wisping steam from it. If not- it is probably plugged and not releasing non-cons from make-up water.

If it has a valve on it- try opening big time and then shutting down till just contact and back off 1/4 turn open.

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#3

Re: Steam Condenser Measurement

08/29/2012 4:30 PM

Is this a new phenomena for the plant, or has it probably been operating this way, but someone just noticed the discrepancy with the steam table?

.

If it is a new phenomena, what other plant parameters have changed since this was noticed?

.

Any changes in steam plant chemistry and/or condensate level would probably reveal a lot.

.

Noncondensable gasses in the condenser could certainly be the cause, as noted by others. Any new air leaks into the condenser should certainly have an effect on chemistry.

.

High condensate levels in the condenser could also cause supercooling of condensate and lead to the discrepancy.

.

Clue us in on more of the plant parameters and we might be able to clue you in on the most likely cause.

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