Idling of centrifugal pump

What is the idling of centrifugal pump? It usually refers to the situation that there is no water or more air in the pump shell when the pump is running. The majority of users are "pale at the talk" about the idling of the centrifugal pump because they do not understand the causes of the idling phenomenon and how to solve it. In fact, the centrifugal pump will not cause damage in a very short period of idling (within 1 minute).
The reasons for the centrifugal pump idling are: the inlet medium of the pump is insufficient or the water inlet pressure is insufficient, or the water inlet pipe of the pump is blocked, or the air in the pump cavity is not exhausted. When the centrifugal pump is idling, the impeller has no or little contact with the medium, so it is unable to work effectively, and the liquid cannot be delivered normally. All these are useless work. As there is no effective work, the load on the motor is very small, and the current generated is also very small, so there will be no impact on the motor. The impact of pump idling on the pump is indeed fatal.
What are the hazards of centrifugal pump idling? The idle water pump is easy to cavitate, causing damage to the pump body and flow passage parts; Idling pump mechanical seal or packing seal will not get liquid lubrication, resulting in dry grinding and rapid damage; The idling pump rotor parts and pump experience heat without liquid cooling, and those narrow gap positions (such as sealing ring) are easy to bite due to the effect of thermal expansion and cold contraction; The balance disc of the idling multi-stage centrifugal pump is not lubricated, and the balance disc will soon be burned and damaged. Therefore, measures must be taken to prevent the pump from idling.

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