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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
API Plan 21
Kit components shown solid and include some optional components.

This plan:

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

Plan 21 is available as a kit of components ready for field assembly. Kit contents may include:

  • Swagelok tube fittings
  • Flange adapters
  • Pipe fittings
  • V series 2-valve manifold
  • 63 series ball valve
  • Bimetal thermometer
  • TTW series thermowell tee
  • PGI series gauges
  • Tubing
  • Pressure transmitter
  • Heat exchanger
  • Heat exchanger stand
  • Pipe nipple

See page 19 of the Mechanical Seal Support Systems Application Guide for additional details and ordering information. Contact your authorized Swagelok sales and service center for information on optional components.

Request more information about Swagelok assembliesBack to Process Side Plans