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Mechanical Seals in Centrifugal Pump

2012-12-19

In the centrifugal pumps the rotor, on which the impeller is mounted, revolves in the stationary housing of the pump and there is minor gap between the two. The centrifugal pump pumps a variety of fluids and sometimes these fluids can be highly hazardous to the humans and environment.

The most effective method of preventing the leakage of the fluid from the centrifugal pump to the external surroundings is using the mechanical seals. The mechanical seals help sealing the rotating part of the shaft against the stationary part of the pump housing. Thus the mechanical seals are the devices that form the packing between the rotor and the stationary part of the centrifugal pumps to prevent the leakage of the fluid being pumped by the pump. There are two main parts of the mechanical seals: one is the stationary part, which is connected to the pump housing and the other is the rotating part which is connected to the rotating shaft.

Prior to the mechanical seals, the compression packing like gland packing were used as the sealants though they are still being used in number of applications. The mechanical seals are especially used in the process applications where the centrifugal pumps handle hazardous chemicals like HCL, sulfuric acid, etc. to meet the safety and the environmental standards as per the federal regulations.