Friday, December 10, 2010

Condenser Vacuum Pump suction too cold

Condenser vacuum pump have two suction line and one line temperature is normal but another line get cold.

Last time the vacuum pump was overhaul due to sound big noisy and suspect the impeller broken from check valve loosen and enter to inside pump casing. But after inspection inside the pump casing, the impeller was okay.


After install and re-alignment the vacuum pump and put it to in service with suction pump header pressure is 0.091Mpa, one of two suction line get cold 15 degree of Celsius. I believe it is coming from too much injection of ammonia, but another suction line the temperature is normal 35 degree of Celsius.


Two line which have no balance of flow, one side get pressure lower so dew point reach. And other question why do we inject too much ammonia? Exactly not too much but we / they change the point of injection. Normally we inject dosing ammonia at condensate pump discharge to protect feed-water and boiler parts, but corrosion at condenser parts is tending to worst so we divide injection of ammonia, one to condenser make up and another to condensate pump discharge.

After flushing air receiver tank continuously, ammonia content can reduce so suction temperature of vacuum pump get normal 35 degree of Celsius.

Click here for read another vacuum pump problem that we already solved.


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