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Seal Supply Systems

Product Description

Pressurized barrier system (closed circuit) for use in seal systems with high pressures and/or for hazardous/environmentally harmful processes. The BFS (Plan 53B) range is available with a pressure accumulator, cooler (finned tube, water or air cooler with fan) and a wide range of instruments.
Circulation in accordance with API 682 / ISO 21049: Plan 53B

Technical Features

  • Available with finned tube, water or air coolers
    with fan.
  • Barrier pressure is created without any need
    for connection to a nitrogen supply.
  • Modular system: combination with a wide
    range of system components/instruments
  • Pressurization is by means of a pre-loaded
    bladder accumulator.
  • The nitrogen is separated from the barrier
    medium by membranes in the accumulator:
    nitrogen cannot get into the barrier medium or
    process medium.

Typical Industrial Applications

  • Chemical industry
  • Oil and gas industry
  • Petrochemical industry
  • Refining technology

Operating and Installation Schematic

Operating and installation diagram for a BFS (Plan 53B).
A. From mechanical seal
B. To mechanical seal
C. Fill
F. Drain
G. Vent
H. N2 Precharge

Functional Description

The BFS is designed to perform the following functions of a barrier system:

  • to pressurize the barrier chamber
  • leakage compensation
  • to cool the seal

Pressurization (> process pressure) prevents the process medium from getting into the barrier circuit or the atmosphere. Pressurization is supplied by a pressure accumulator which is pre-loaded with nitrogen. Circulation in the barrier circuit takes place by the thermosiphon principle or by forced circulation, e.g. with a pumping screw.


PED 97/23 EC (Design and production in accordance with EU Pressure Equipment Directive)
ASME VIII, Div. 1 (Design, calculation and production)


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