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Swagelok Quebec Group

Your Authorized Swagelok Sales and Service Center

API Plan 21 Cooled Flush

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.

plan 21 


  • Provides cooled flush fluid to the process side of the seal
  • Removes heat and flushes particulate from the seal chamber
  • Reduces coking or polymerization
  • Improves fluid vapor margin in the seal chamber

See page 15 of the Mechanical Seal Support Systems Applications Guide for additional details.


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