After stopping the operation of a centrifugal pump, there are several important requirements to ensure safe shutdown and proper maintenance. First, the pump should be stopped after closing the valve, allowing it to cool down before shutting off the auxiliary systems. This helps prevent thermal stress and damage to internal components.
For high-temperature pumps, it is essential to follow the specific instructions outlined in the technical documentation. After shutdown, the pump should be turned halfway every 20–30 minutes until the temperature drops below 50°C. This prevents uneven cooling and potential deformation of the pump casing.
When dealing with cryogenic pumps, if there are no special instructions, the pump should remain filled with liquid during shutdown. The suction and discharge valves should be kept open to maintain system integrity. For pumps equipped with double-end mechanical seals, the liquid level in the seal chamber and the sealing pressure must be maintained to avoid leakage or damage.
For pumps handling media that can crystallize, coagulate, or settle, it's crucial to flush the pump and pipelines with water or an appropriate medium immediately after shutdown. This prevents clogging and ensures smooth operation when the pump is restarted.
Additionally, any residual liquid remaining inside the pump should be drained to prevent corrosion or cracking, especially in cases where the liquid may react with the pump material over time.
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