Products

API Plan 74

API Plan 74

Externally supplied barrier gas for arrangement 3 dual pressurized non-contacting gas seals.

A  Gas OUT
B  Gas IN

Seal chamber details

2  Vent (if required)
3  Gas barrier inlet (GBI)
4  Gas barrier outlet (GBO) (normally closed), used only to depressurize barrier
5  Seal chamber


Example seal: EagleBurgmann CGSH-KD dual pusher mechanical seal.

P&ID according to API

Key

1  Barrier gas panel
3  Gas barrier inlet (GBI)
4  Gas barrier outlet (GBO) (normally closed), used only to depressurize barrier
6  From barrier gas supply


FIL  Coalescing filter
FIT  Flow transmitter with local indicator
PCV  Pressure control valve
PIT  Pressure transmitter with local indicator

Features

  • Nitrogen is used as barrier gas.
  • Pumped media never leaks to the atmosphere.
  • High reliability due to the absence of foreign particles/solids in the barrier gas.

Application

  • For dual pressurized non-contacting seals.
  • For media with moderate temperatures, with poor lubrication properties or with hazardous or toxic nature.
  • For services where media contamination is acceptable but no media leakage to atmosphere is tolerated.
  • Flashing light hydrocarbons.

Remarks, checkpoints

  • Check if nitrogen is compatible with the pumped media.
  • Ensure that the barrier gas pressure is higher than the seal chamber pressure by at least 1.7 bar 25 PSI).
  • Set the back pressure regulator at least 1.7 bar (25 PSI) above the seal chamber pressure.
  • Check filter from time to time for any blockages.
  • Do not use for polymerizing and sticky media as this creates problems with the inboard seal faces.
  • Ensure a reliable nitrogen supply. Avoid usage of nitrogen gas bottles.
  • Use individual gas panel per seal assembly in a between bearing pump.

Pump media characteristics

  • Poor lubrication
  • Clean, non-polymerizing moderate temperature fluids.
  • Hazardous / environmentally harmful
  • Close to vaporization point
  • High vapor pressure media

Location, function

  • Between seals
  • Barrier system (psealchamber < pbetweenseals)

Configurations

3NC-FB, 3NC-BB, 3NC-FF

 

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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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