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Direct steam injection into cooling water line at pump suction

Currently there is an operation scenario at one of our plant which directly injecting steam into cooling water line at pump suction in order to generate hot water at 60 deg C for circulation, by doing this its generate vapor at pump suction and lead to cavitation which ultimately damage pump and mechanical seals. Please advise better solution to this rather than installing a heat exchanger.

Inject into the delivery side of the pump. The steam pressure should be above the pump outlet pressure for this to happen. Alternatively, inject steam into the water reservoir using a thermostat to maintain the temperature at the level needed.

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