The BFS system performs all the basic functions of a buffer/barrier system for the operation of double seals:
To pressurize the buffer chamber
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.
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.
Circulation in accordance with API 682 / ISO
21049: Plan 52, Plan 53A
The BFS6000 range of vessels range conforms
to API 682 guidelines. The vessels are
equipped with all essential connections for
fitting additional components. The BFS 6000
system is available in standard sizes with flat
ends, sight-glasses for level monitoring and
with or without cooling coil. BFS 6000 system is
equipped as a standard with all the necessary
system connections and brackets.