Plan 53B in Sealban

API Plan 53B circulates a pressurized barrier fluid between the inboard and outboard seals. The source of pressurization is a bladder accumulator. Plan 53B has the advantage of not allowing gas absorption into the barrier fluid which may allow for operation at higher pressures than Plan 53A. Barrier fluid pressure should be monitored as an indicator of seal leakage. Barrier fluid will leak across the inboard seal face and pass into the process. For this reason, the barrier fluid must be chemically compatible with the process fluid and process dilution not a concern. 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:

Attains a higher barrier fluid pressure with the use of a pressurized bladder accumulator

Provides additional heat removal from inboard seal when required

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