Plan 32 - Single seals - External flush source to seal
Description: Plan 32 uses a flush stream brought in from an external source to the seal. This plan is almost always used in conjunction with a close clearance throat bushing.
Advantages: The external flush fluid, when selected properly, can result in vastly extended seal life.
General: When an outside flush source is used, concerns regarding product dilution and/or economics must be considered by the user. Source pressure must be maintained a minimum of 15 psig above maximum seal chamber pressure.