1. Before the pipeline centrifugal pump is started, the water filling is insufficient or the vacuum pump has not exhausted the air in the water pump. Extend the water filling time, increase the water filling volume, and continue to use the vacuum pump to pump air. If the water diversion is still not full and the air is not clean, consider checking whether the water inlet pipe is leaking, whether the bottom valve is rusted, and whether the stuffing box is leaking. Then, repair or replace the detected problems respectively.
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2. The assembly head of the pipeline centrifugal pump exceeds the rated head of the pump. Appropriately reduce the installation height of the pump (referring to the vertical distance between the centerline of the pump shaft and the water level of the well) or shorten the length of the suction pipe, and appropriately increase the diameter of the suction pipe (generally, the diameter of the suction pipe is larger than the diameter of the water inlet of the pump Level 1) in order to reduce the assembly head of the pump and increase the suction height of the pump.
3. The inlet pipe of the centrifugal pump of the pipeline leaked air, which caused the leaky seal, the dissatisfaction of the water diversion and irrigation, and the unclean air extraction. Use the light method to check. If there is air leakage at the pipe wall, repair the blockage; if it is air leakage at the interface, tighten it with a wrench or replace the leather pad.
4. The impeller of the pipeline centrifugal pump is reversed. The direction of rotation of the water pump can be changed by changing the direction of rotation of the power machine. If the electric motor is used as the power, the phase sequence of the motor wiring should be adjusted to change the motor rotation; if the internal combustion engine is used as the power, the driving belt should be cross-driven to adjust.
5. The suction pipe of the pipeline centrifugal pump is not immersed deep enough in the water. First measure the depth of the suction pipe of the centrifugal pump immersed in the water. If the immersion is too shallow, measures such as reducing the installation height of the pump or increasing the length of the suction pipe of the centrifugal pump should be taken to ensure that the depth of the suction port of the pump immersed below the water surface is not less than 0.5 meters.
6. The water inlet of the pipeline centrifugal pump or the flow path of the impeller is blocked. First stop to check out the specific blockage, and then remove the blockage. Finally, according to the type of blockage (sand, debris, etc.), wash wells (recommended air compressor or other equipment), set up trash racks, etc. Measures to improve the quality of influent water and prevent clogging from happening again.
7. The bottom valve of the pipeline centrifugal pump cannot be opened flexibly or is rusted, causing the bottom valve to fail to open or close tightly. If this happens, stop first. Then lift the faucet of the water pump to the ground, remove the bottom valve for inspection, and repair or replace it according to the actual situation.
8. The suction of the pipeline centrifugal pump is too high. Appropriately reduce the installation height of the pump or try to reduce the water pressure loss (such as using smooth inner wall inlet and outlet pipes).
9. The impeller of the pipeline centrifugal pump is seriously damaged. Disassemble the pump and remove the impeller for inspection. If the impeller is not badly damaged (wear, cavitation), it should be repaired; if the impeller is badly damaged, it should be replaced with a new one.
10. Air leakage at the stuffing box of the pipeline centrifugal pump causes a leaky seal.
First tighten the stuffing box gland with tools. If the fault cannot be eliminated, disassemble the stuffing box, check the water seal ring and packing for defects (water seal ring twisted, deformed, stuffing hard, deformed, etc.), repair or replace if necessary.
11. The impeller fixing nut and key of the pipeline centrifugal pump are loose or come out. Open the pump body and check the positioning key and lock nut of the impeller. If the key is out or damaged, you should reset the positioning key or repair it first, replace the positioning key, and then reset. If the impeller lock nut becomes loose or falls off, the lock nut should be matched first, and then tighten the impeller lock nut with a tool.
12. The rotational speed of the pipeline centrifugal pump is too low. First increase the speed of the power machine to meet the rated speed of the centrifugal pump. If the power machine is an electric motor, first check whether the power supply voltage is too low. If it is too low, try to increase it. If it is normal, replace the electric motor with a higher power; if the power machine is an internal combustion engine, you should first increase the throttle by increasing the throttle. If the speed cannot meet the rated speed of the water pump, a higher-power internal combustion engine should be replaced. Secondly, replace the transmission wheel of the power machine or the water pump (change the transmission ratio:) to meet the rated speed of the water pump.
13. The resistance of the drainage pipe of the pipeline centrifugal pump is too large. First check the length of the drainage pipe and the bend, try to reduce the length of the bend and the pipe, and choose a pipe with the same diameter as the pump.