Plan 53A in Sealban

API Plan 53A utilizes a reservoir and circulates a pressurized barrier fluid between the inboard and outboard seals. The typical source of pressurization is plant nitrogen. The reservoir should be set at least 20 psi (1.3 bar) above maximum seal chamber pressure. This is to ensure that leakage across the inboard seal face is barrier fluid which then lubricates the seal faces and passes into the process. For this reason, 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. A reservoir level indicator or level transmitter shows both inboard and outboard seal leakage.

This plan:

Provides additional heat removal from inboard seal when required

Is used with a dual seal arrangement when process leakage to atmosphere cannot occur

Plan 53A is available as a seal pot assembly. The associated field installation kit for use in connecting the assembly to your system is also available.