Requirements after the centrifugal pump has been stopped

① After the centrifugal pump stops running, the inlet valve of the pump should be closed, and the valves of the auxiliary system should be closed in turn after the pump cools down.

② The high temperature pump should be stopped according to the provisions of the technical documents of the equipment. After stopping, it should be cranked for half a circle every 20-30min until the temperature of the pump body drops to 50℃.

③ When the cryogenic pump is shut down, if there are no special requirements, the pump should always be filled with liquid; the suction valve and discharge valve should be kept normally open; the cryogenic pump with double-end mechanical seal, the liquid level controller and the sealing liquid in the pump sealing cavity The grouting pressure of the pump should be maintained.

④ For pumps that transport media that are easy to crystallize, solidify, and precipitate, etc., stop the pump to prevent blockage, and flush the pump and pipeline with clean water or other media in time.

⑤ Drain the liquid accumulated in the pump to prevent rust and freeze cracking.