One function of the recirculating pump is to purify the sealing oil. The sealing oil goes through the recirculating pump into the vacuum tank. As the re-circulated oil is diffused, the gas and water are separated from the oil. The sealing oil system of Dongfang 300MW unit is single loop, vacuum tank and vacuum pump and recirculation pump belongs to oil purification system.
HSNH280-43NZ Sealing Oil Recirculating Pump
Pump Rotor Assembly
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