Plan 21 in Sealban

API Plan 21 adds a cooler to Plan 11 for applications requiring better control of flush vapor margin. Flow is routed from the discharge side of the pump through an orifice and a cooler before being returned to the seal chamber.

This plan:

Provides cooled flush fluid to the process side of the seal

Removes heat and flushes particulate from the seal chamber

Improves fluid vapor margin in the seal chamber

Plan 21 is available as a kit of components ready for field assembly.