Plan 53B


Pressurized barrier system with pressure maintained by a bladder accumulator


  • Circulation is maintained by a pumping ring when equipment is energized, by thermosiphon effect when idle
  • Barrier fluid and pressurized inert gas are kept separate by the bladder
  • Heat is removed from the system by a heat exchanger (air or water cooled)
  • Stand alone system does not rely on a centralized pressure source
  • No media leakage to the atmosphere
  • Seal life optimized by maintaining clean fluid film between the seal faces

For use:

  • Where no leakage to atmosphere is allowed; hazardous, flammable, toxic fluids
  • For dirty, abrasive or polymerizing fluids where media is unsuitable as a lubricant for the inboard seal faces




  • There will always be some leakage of barrier fluid into product – verify compatibility
  • Heat dissipation is totally dependent on cooler efficiency as there is low volume of barrier fluid in system
  • Always recharge bladder to 0.9 times the working pressure
  • Vent the system properly before start up
  • Barrier fluid contamination can cause corrosive degradation of equipment