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API Plan 11 recirculates flow from a high‐pressure section of the pump, typically the discharge piping, through a flow control orifice to the seal. Plan 11 is the default flush plan for most pumps.

api plan 11 
API Plan 11
Kit components shown solid and include some optional components.

This plan:

  • Removes heat from the seal chamber
  • Ensures proper pressure in the seal chamber in order to prevent pumped fluid from vaporizing
  • Allows seal chamber to be self-venting when used with horizontal pumps

Plan 11 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
  • Bimetal thermometer
  • TTW series thermowell tee
  • PGI series gauges
  • Tubing
  • Pressure transmitter
  • Pipe nipple

See page 11 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.

Contact your Authorized Sales and Service Center Back to Process Side Plans