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Swagelok Quebec Group

Your Authorized Swagelok Sales and Service Center

API Plan 12 Flush with Strainer

API Plan 12 recirculates flow from a high‐pressure section of the pump, typically the discharge piping, through a flow control orifice to the seal. In order to remove particulate in the flush stream and prevent clogging, flow passes through a strainer placed prior to the flow control orifice. The addition of pressure gauges on either side of the strainer allows the strainer to be monitored for servicing.

plan 12 


  • Prevents orifice clogging through the addition of a strainer
  • Removes heat and flushes particulate from the seal chamber
  • Ensures proper pressure in the seal chamber to prevent pumped fluid from vaporizing
  • Allows the seal chamber to be self-venting when used with horizontal pumps

See page 9 of the Mechanical Seal Support Systems Applications Guide for additional details.


Contact your local distributor