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Swagelok Quebec Group

Your Authorized Swagelok Sales and Service Center

API Plan 55 Buffer Liquid Circulated by External System

API Plan 55 is a custom engineered system that delivers an unpressurized buffer fluid to the seal chamber. The buffer liquid is circulated to and from the seal chamber via a pump located on an external reservoir. A Plan 55 can contain filters, coolers, and other components that are selected according to the specific parameters of the application. This system provides both cooling and lubrication to the outboard seal independent of the operation of the pump.

plan 55 


  • Provides a cool, clean, unpressurized buffer fluid to a dual pressurized seal.

See page 47 of the Mechanical Seal Support Systems Applications Guide for additional details.


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