How Is The Pumping Ring Applied in The Mechanical Seal Circulation System (I)

With the wide application of tandem or double mechanical seals, the circulation conditions of buffer fluid or spacer fluid determine the service life of mechanical seals to varying degrees, requiring the pumping ring to provide greater circulation power in a smaller space size . The pumping ring can not only drive the circulation of the sealing fluid, but also use its pressure-generating characteristics to reversely use it at the front end of the seal to reduce the working pressure of the mechanical seal and improve the working conditions to increase the service life of the mechanical seal device.

Pumping rings are commonly used in API schemes 23, 52, and 53 to drive sealing fluid circulation, and the following content will introduce them respectively.

2.API scheme 23
API scheme 23 is a circulation process in which the sealing liquid is driven by the pumping ring,to come out of the sealing chamber, to be cooled by the heat exchanger, and then to return to the sealing chamber of the mechanical seal device.The seal in this scheme is a single mechanical seal. This scheme is the preferred auxiliary system scheme for high-pressure hot water pumps. The sealing fluid here is the process medium pumped. Under normal circumstances, the sealing liquid has no leakage, and only circulates between the sealing chamber and the cooler, taking away the heat generated by the sealing operation and the heat conducted by the pump body to the sealing chamber, and reducing the temperature of the sealing chamber of the mechanical seal device.Due to the throttling effect of the pump throat bushing, the sealing liquid is rarely renewed with the process medium. If the sealing liquid has physical or chemical changes such as coking, crystallization, and deterioration, it is not suitable for this plan. Due to the limited driving head of the pumping ring of the mechanical seal auxiliary system, it is not suitable to use a heat exchanger with a large flow resistance, and the flow resistance of the pipeline should not be too large.

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