1 After the centrifugal pump stops running, the inlet valve of the pump should be closed. After the pump is cooled, the valves of the accessory system are closed.
2 High-temperature pump parking should be carried out according to the provisions of the equipment's technical documents. After parking, it should be half a turn for 20-30min, until the pump body temperature drops to 50°C.
3 When the cryogenic pump is stopped, when there is no special requirement, the pump should always be filled with liquid; the suction valve and the discharge valve should be kept open; the cryopump 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 Pumps that are easy to crystallize, easy to solidify, and easy to settle, etc., should be prevented from blocking after the pump is stopped, and the pumps and pipes should be flushed with clean water or other medium in time.
5 Discharge the liquid accumulated in the pump to prevent rust and cracking.