Problems associated with the use of centrifugal pumps for gasesensitive media
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“When vaporization of the medium may occur at the pump inlet, a balance line should be installed between the pump inlet and the inlet isolation valve, along with an isolation valve. The balance pipe leads to the suction-side container or is discharged directly into the corresponding exhaust pipeline.” I would like to ask everyone what the principle behind doing this is What is the actual effect?
It is to prevent gases from occupying the space of liquids, so that centrifugal force (appropriate for liquids) cannot be generated, and no work can be done. Therefore, corresponding exhaust measures are taken to solve this problem (to eliminate the gas entrapment phenomenon).
This should be the exhaust pipeline before starting the pump. It should be turned off after normal operation. If vaporization occurs during normal operation, it is cavitation, and this method is completely ineffective.
It seems it isn’t used very often in actual work.