What are the reasons why the condensate pump does not deliver fluid?
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There is a question: the condensate pump is connected to the turbine’s exhaust system. The negative pressure in that exhaust system is around -0.07 MPa, and the water temperature is approximately 70 degrees. Often, when the pump is switched over or during normal operation, it fails to deliver sufficient flow – the outlet pressure is low, and the condensate cannot be pumped out. Could it be that the water vaporizes under these conditions, causing vapor lock in the pump and thus preventing it from functioning properly? I would appreciate it if experts could help analyze what the actual cause is. Thank you
This post was last edited by 3983596_FPPZ on 2018-11-26 at 20:47. Of course; after checking, the saturated vapor pressure of water at 70 degrees Celsius is 31 KPa = 0.031 MPa (absolute pressure), while the actual value is -0.07 MPa. Vaporization is necessary, and since it’s all water vapor, the pump definitely won’t work properly
Overall, the pressure entering the pump is too low (the negative pressure is around -0.07 MPa).
Cavitation is the cause; there’s no other reason :)