Plan 23 in Sealban

API Plan 23 utilizes a circulation device, typically a pumping ring, to route the fluid from the seal chamber through a cooler before returning the cooled fluid to the seal chamber. A throat bushing isolates the cooled seal chamber flush fluid from the hotter pumped liquid.

This plan:

Provides an isolated cooled flush fluid in the seal chamber

Reduces cooler duty due to isolated flush fluid, extending the life of the close-clearance throat bushing

Plan 23 is available as a kit of components ready for field assembly.