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API Plan 55

Unpressurized external buffer liquid system supplying clean fluid to the inboard and outboard seal faces.

API Plan 55

Application Notes

  • Used with Arrangement 2 seals.
  • Buffer liquid shall be maintained at a pressure less than seal chamber pressure.
  • Buffer liquid is circulated by an external pump.
  • Plan 55 is similar to Plan 54 except the barrier liquid is unpressurized (buffer liquid).
  • Process fluid is not contaminated.
  • Near zero process emissions.
  • Provides buffer liquid cooling and circulation even if the process pump is not active.
  • Sensors and flowmeters may be added within the external system to readily identify seal failure based on support system conditions.

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