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API Plan 51 is a quench system for use on the atmospheric side of a single seal. This system acts as a dead-ended reservoir for a fluid.

Plan 51
API Plan 51
Kit contents shown solid and include some optional components.

This plan:

  • Prevents icing on the atmospheric side of the seal
  • Is typically used on vertical pumps

Plan 51 is available as a kit of components ready for field assembly. Kit contents may include:

  • Swagelok tube fittings
  • V series 2-valve manifold
  • 63 series ball valves
  • PGI series gauges
  • Swagelok pipe fittings
  • Swagelok flange adapters
  • Pressure transmitter
  • Flange gasket
  • Flange studs/nuts
  • Buffer fluid reservoir
  • Pipe nipple

See page 75 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 Atmospheric Side Plans