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API Plan 55 Buffer Fluid Circulated by External System

API Plan 55 is a custom engineered system that delivers an unpressurized buffer fluid to the seal chamber. The buffer liquid is circulated to and from the seal chamber via a pump located on an external reservoir. A Plan 55 can contain filters, coolers, and other components that are selected according to the specific parameters of the application. This system provides both cooling and lubrication to the outboard seal independent of the operation of the pump.

plan 54plan 55 
API Plan 55 Assembly and API Plan 55 Kit
Assembly and kit shown with some optional components.

This plan:

Provides a cool, clean, unpressurized buffer fluid to a dual pressurized seal.

Plan 55 is available as a seal skid assembly. The associated field installation kit for use in connecting the assembly to your system is also available. Assembly contents may include:

  • Swagelok tube fittings
  • 63 series ball valves
  • 1 series needle valve
  • V series 2-valve manifold
  • Bimetal thermometer
  • TTW series thermowell tee
  • Thermowell
  • Hydraulic reservoir
  • Swagelok pipe fittings
  • Pump/coupling/motor
  • Diaphragm accumulator
  • Shell and tube head exchanger
  • Thermostatic mixing valve
  • Filter heads/elements
  • Differential pressure indicators
  • Suction strainer
  • Flow/pressure control valves

See page 51 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 Between Seal Plans