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Swagelok Quebec Group

Your Authorized Swagelok Sales and Service Center

API Plan 75 Condensing Leakage Collection

API Plan 75 collects leakage from the inboard seal in applications where normal process fluid leakage can condense between the seals at ambient temperatures. In this arrangement, a reservoir is connected to the containment seal drain port on the gland. Condensed leakage from the inner seal is collected in the reservoir while vapor is routed to the flare system. Excessive liquid inner seal leakage is detected by a level transmitter, while excessive gaseous leakage is detected by a pressure transmitter situated prior to an orifice on the tubing connected to the flare. A visual level indicator on the reservoir indicates when the reservoir needs to be drained.

plan 75 


  • Collects and monitors inner seal leakage that condenses at ambient temperatures
  • Is typically used in conjunction with a Plan 72

See page 59 of the Mechanical Seal Support Systems Applications Guide for additional details.


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