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Swagelok Quebec Group

Your Authorized Swagelok Sales and Service Center

API Plan 31 Flush with Cyclone Separator

API Plan 31 is used to remove solids from the flush stream by incorporating a cyclone separator into the flush tubing. Flow is routed from the discharge side of the pump through the cyclone separator. Clean flush fluid leaving the separator is routed to the seal chamber while fluid containing the solids is tubed back into the suction side of the pump. In order for Plan 31 to be effective, it is recommended that the specific gravity of the solids be twice the specific gravity of the flush fluid.

plan 31 


  • Removes solids from the flush fluid.

See page 21 of the Mechanical Seal Support Systems Applications Guide for additional details.


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