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Seal Supply Systems

Product Description

The Sealmatic Thermosiphon systems of the BFS6000 range 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: BFS6000) with dished heads; a version which can be dismantled is also available as an option. The modular system allows the BFS6000 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 No. Description
1 Level switch
2 Manometer
3 Manifold
4 Pressure switch
5 Shut-off valve
6 Orifice

Technical Features

  • 1. A version which can be dismantled is also
    available as an option: for optimum and
    simple cleaning of the vessel interior
  • Modular system: combination with a wide
    range of system components possible
  • Operating limits up to 50 bar / 200°C:
    suitable for a wide range of demanding
    operating conditions
  • Robust design with weld-pad type sightglass
    for optimum visual level monitoring

Operating and Installation Schematic

Operating and installation diagram for a BFS6000 system.
The BFS vessel must always be installed higher than the mechanical seal. The buffer/barrier fluid flows via the return pipe into the vessel and is cooled. The exchange of fluid takes place by the thermosiphon principle or by forced circulation, e.g. with a pumping screw. Connection pipes to the seal should be designed with as little resistance as possible.


  • PED 97/23 EC
  • ASME VIII, Div. 1

Functional Description

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 thermosiphon 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.


Standard Cartridge Seals

Mechanical Seals As Per API 682

Split Seals

Engineered Seals For Demanding Applications

Standard Mechanical Seals For Pumps & Compressors

Mechanical Seals For Agitators, Mixers, Kneaders & Reactors

Supply Systems & Components

API 682 / ISO 21049

Technical Information