What is the reason for leakage when a centrifugal pump is used again after being shut down for a long time?

Thread Content

What is the reason for leakage when a centrifugal pump is used again after being shut down for a long time? When a centrifugal pump is left unused for an extended period of time and is then put back into use, it should be operated in accordance with the instructions provided in the user manual. The pump started without any signs of idling, but it began to leak water after starting. The reason for this is that, due to its long period of inactivity, there was no liquid inside the pump; as a result, the rubber components of the mechanical seal were exposed to the atmosphere for an extended time, which caused oxidation. This led to adhesion between those rubber components and the pump shaft. If the motor is not manually rotated before use to separate the rubber from the pump shaft, the high torque generated when the motor starts can damage the rubber, resulting in leakage from the mechanical seal. Therefore, it is recommended that for centrifugal pumps and self-priming pumps that have been stored without liquid for more than 1 month, the pump shaft should be rotated manually before starting the pump again. Shanghai Shengou Pump Valve Co., Ltd. 021-54148004