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The idling of the centrifugal pump will cause great damage to the water pump, which may cause cavitation or damage the mechanical seal. Let’s explore the causes and hazards of idling centrifugal pumps with everyone today.
The inlet medium of the water pump is insufficient or the water inlet pressure is not enough, or the water inlet pipe of the water pump is blocked, or the air in the water pump cavity is not exhausted.
2. The hazards of idling
The main impacts on the water pump are as follows:
(1) Due to the large amount of gas in the idling water pump, it is easy to cause cavitation and damage the pump body and flow parts;
(2) The mechanical seal or packing seal is not lubricated by liquid, and dry grinding is extremely easy to cause abrasion;
(3) The balance plate of the idling multi-stage centrifugal pump is not lubricated by anyone (public number: pump steward), the balance plate will be burnt to death and damaged soon;
(4) The water pump is idling without liquid, the rotor parts and the pump body will heat up, and the temperature cannot be cooled. Thermal expansion and contraction can easily cause part of the gap (such as the seal ring) to seize.
3. Early warning and maintenance
(1) Deal with the various clearance positions of the centrifugal pump, expand it under allowable conditions, and prevent seizure;
(2) Carry out special process treatment, quenching and tempering, heat treatment, etc. to the shaft of the centrifugal pump to improve the hardness, and use low-flexibility materials to prevent large swings and seizures during idling;
(4) Use enclosed self-lubricating bearings that do not need to be refueled;
(5) Compared with other centrifugal pumps, the pump cavity of the horizontal self-priming centrifugal pump has an increased volume and has a place where water can be stored. Before the self-priming centrifugal pump works normally, the cavity must be filled with liquid. There is a period of self-priming before operation. During this period of time, air is continuously discharged to the outside of the pump. This period of time is partly idling;
(6) Set up idling induction system. The water pump is monitored in real time through modern equipment. When the centrifugal pump is idling, it immediately alarms and automatically shuts down to protect the safety of the unit.