Mechanical Seals Thermosyphon Systems API 682/ISO 21049 - BFS 6000

The BFS system performs all the basic functions of a buffer/barrier system for the operation of double seals:

  • To pressurize the buffer chamber
  • Leakage compensation
  • Buffer/barrier fluid is circulated by thermosyphon effect or forced circulation system
  • To cool the seal
  • To selectively absorb product leakage and prevent dry running (tandem arrangement)
  • Use compressed air or nitrogen for pressurization; pressurization is monitored by a pressure switch
  • The incorporated level switch issues a signal whenever the level of buffer/barrier fluid is too low

The BFS 6000 range of systems meet all the requirements to supply mechanical seals in accordance with the API 682 guidelines. The vessels are equipped with all essential connections for fitting additional components. The range is available in two standard vessel sizes (shown: BFS 6000) with dished heads; a version which can be dismantled is also available as an option. The modular system allows the BFS 6000 vessels to be combined with a wide range of system components such as, level switch/transmitter, pressure switch/transmitter, base frame, etc. Circulation in accordance with API 682 / ISO 21049: Plan 52, Plan 53A


Item Description 
1 Buffer/barrier fluid IN (G1/2")
2 Buffer/barrier fluid OUT (G1/2")
3 Cooling water IN (pipe 12 x 1.5 mm)
4 Cooling water OUT (pipe 12 x 1.5 mm)
5 Filling connection with cap (G1/2")/td>
6 Pressure gas connection (1/4NPT)
N1 to the mechanical seal
N2 from the mechanical seal
N3 Level switch
N4 Level switch
N5 Filling connection
N6 Drain
N7 Cooling water IN
N8 Cooling water OUT
N9 Connection to flare
Dimensions for BF S6002 / BFS 6003, values in brackets for
BFS 6000 / BFS 6001


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