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How should a high-temperature submersible pump be maintained after it stops running?

2017-08-30

Even the best water pump will not achieve higher efficiency without maintenance. Therefore, some basic requirements must be observed when using high-temperature submersible pumps. Below, Yutong Pump Industry introduces the requirements after the submersible pump stops running. 1. After the centrifugal pump stops running, the pump's inlet valve should be closed, and the valves of the auxiliary system should be closed in sequence after the pump cools down. 2. The high-temperature pump should be stopped according to the provisions of the equipment technical documents. After stopping, the pump should be rotated half a circle every 20-30 minutes until the pump body temperature drops to 50℃. 3. When the low-temperature pump is stopped, the pump should always be filled with liquid unless otherwise specified.

How should a high-temperature submersible pump be maintained after it stops running?

　　Even the best water pumps will not achieve higher efficiency without maintenance. Therefore, some basic requirements must be observed when using high-temperature submersible pumps. Yutong Pump Industry will now introduce the requirements after the submersible pump stops operating.

　　1. After the centrifugal pump stops operating, the pump's inlet valve should be closed, and the valves of the auxiliary system should be closed sequentially after the pump has cooled.

　　2. For high-temperature pumps, shutdown should follow the regulations in the equipment's technical documents. After shutdown, the pump should be rotated half a turn every 20-30 minutes until the pump body temperature drops to 50℃.

　　3. When stopping a low-temperature pump, unless otherwise specified, the pump should always be filled with liquid; the suction valve and discharge valve should remain open; for low-temperature pumps using double-end face mechanical seals, the liquid level controller and the sealing liquid in the pump sealing chamber should maintain the pump's grouting pressure.

　　4. For centrifugal pumps transporting media that are prone to crystallization, solidification, or sedimentation, blockage should be prevented after the pump stops, and the pump and pipes should be promptly flushed with clean water or other media.

　　5. Discharge any liquid accumulated in the pump to prevent rust and freezing.

　　Submersible pumps are widely used in the power, metallurgy, coal, and building materials industries to transport slurries containing solid particles. Examples include hydraulic ash removal in thermal power plants, ore slurry transportation in metallurgical beneficiation plants, and coal slurry and heavy medium transportation in coal washing plants. When a submersible pump is in operation, the pump needs to be placed on land, the suction pipe in the water, and priming is required for startup. Due to structural limitations, for slurry pumps and submersible centrifugal pumps, the motor needs to be placed above the water surface during operation, with the pump submerged. Therefore, it must be fixed; otherwise, the motor falling into the water will cause it to be scrapped. Moreover, since the length of the shaft is generally fixed, the pump installation and use are more troublesome, and the application scenarios are subject to many limitations.