After stopping the operation of a centrifugal pump, several important steps should be followed to ensure safe and proper shutdown. First, the pump should be turned off after closing the valve to prevent backflow, then allowed to cool down before shutting off the auxiliary systems. For high-temperature pumps, it is essential to follow the guidelines provided in the technical documentation. After shutdown, the pump should be turned 20–30 degrees every 30 minutes until the temperature drops to 50°C or lower. This helps prevent thermal stress and damage.
For cryogenic pumps, if there are no special instructions, the pump should remain filled with liquid during shutdown. The suction and discharge valves should stay open to maintain system integrity. If the pump uses a double-end mechanical seal, the liquid level controller and seal chamber pressure must be maintained to prevent leakage and ensure proper sealing.
When handling media that is prone to crystallization, coagulation, or sedimentation, the pump should be drained and flushed with water or an appropriate medium after shutdown to avoid blockages and damage to the internal components. Also, any remaining liquid inside the pump should be removed to prevent corrosion or cracking of the internal parts.
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