Products

API Plan 55

API Plan 55

Unpressurized external buffer fluid system supplying clean buffer liquid for the outer seal of an arrangement 2 unpressurized dual seal. Buffer liquid is circulated by an external pump or pressure system.

A  From external source
B  To external source

Seal chamber details

1  From external source
2  To external source
3  Flush (F)
4  Liquid buffer OUT (LBO)
5  Liquid buffer IN (LBI)
6  Seal chamber


Example seal: EagleBurgmann LY9DZTT dual pusher mechanical seal.

P&ID according to API

Key

1  From external source
2  To external source

Features

  • Provides lubrication and cooling to the outboard safety backup seal.
  • The pumped fluid does not become contaminated.
  • The pumped media does not leak directly to the atmosphere.
  • Uses an external pump or pressure system to ensure buffer liquid circulation.
  • Provides buffer liquid circulation and cooling even though the process pump is in stand-by mode.

Application

  • For flashing services – for example light hydrocarbons, high vapor pressure fluids.
  • Can also be used for non-flashing service.
  • For services where product dilution is not acceptable.
  • Where a single system is to be utilized for multiple seals.

Remarks, checkpoints

  • Not to be used for contaminated and polymerizing media.
  • Sense the seal inlet and outlet line temperatures. Difference in the temperatures is an indication of proper flow.
  • Provide proper instruments like a flowmeter which will indicate outboard seal leakage when the flow increases. Also provide suitable pressure reduction as well as non-return valves in the flushing pipeline.
  • The buffer liquid shall be maintained at a pressure less than seal chamber pressure and less than 2.8 bar (40 PSI).
  • Ensure the compatibility of buffer liquid with the pump media.
  • These systems may need additional engineering depending on application.

Pump media characteristics

  • High temperature
  • High vapor pressure, flashing media
  • Clean, non-polymerizing
  • Hazardous / environmentally harmful if leaked directly to the atmosphere.

Location, function

  • Between seals
  • Buffer system (psealchamber > pbetweenseals)
  • Flushing and cooling

Configurations

2CW-CW

 

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Sealing technology by EagleBurgmann is used worldwide in oil and gas industries, refineries, the petrochemical, chemical, and pharmaceutical industries, food processing, energy, water, mining, paper, aerospace, and other industries. Close to 5,800 employees provide their ideas, solutions, and commitment so that customers can rely on our sealing technology.

What makes us stand out is our excellent quality, great innovative capacity, and an extensive product portfolio for nearly all industrial processes and fields of application. Our product portfolio includes everything from mechanical seals and seal supply systems to magnetic couplings, carbon floating ring seals, expansion joints, and gaskets and packings as well as comprehensive services. Since we are part of the German Freudenberg and Japanese EKK group, we have all the necessary resources for a firmly based reliable partnership.

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