Plan 53C in Sealban

API Plan 53C circulates a pressurized barrier fluid between the inboard and outboard seals. The source of pressurization is a piston accumulator. Plan 53C is preferred for applications where the seal chamber pressure may vary during pump operation. A sensing line is typically run from the seal chamber into the piston accumulator, allowing for a constant pressure differential to be maintained. As with Plan 53A and Plan 53B, barrier fluid must be compatible with process fluid and some level of process dilution be acceptable. In order to provide positive circulation through the support system and into the seal, a pumping ring is employed. Heat removal is achieved by using a heat exchanger.

This plan:

Provides additional heat removal from inboard seal when required

Is used when the seal chamber pressure can vary during pump operation

Is used when process leakage to atmosphere cannot occur

Plan 53C is available as an assembly. The associated field installation kit for use in connecting the assembly to your system is also available.