Barrier/buffer fluid system

TSA6 <br/>Barrier/buffer fluid system
Thermosiphon System (API Plan 52)

1 Level transmitter
2 Pressure transmitter
3 Manifold
4 Shut-off valve
5 Orifice

N1 to the mechanical seal
N2 from the mechanical seal
N3 Filling connection

N4 Drain
N5 Cooling water IN
N6 Cooling water OUT

N7 Connection to flare

Barrier/buffer fluid system


The EagleBurgmann barrier/buffer fluid systems of the TSA6 range meet all the requirements to supply mechanical seals in accordance with the API682 4th edition guidelines. The vessels are equipped with all essential connections for fitting additional components.
Available as bottom flanged version (TSB6) which can be dismantled for optimized and easy cleaning purpose of the inside of the vessel.
The modular system allows the TSA6/TSB6 vessels to be combined with a wide range of system components such as level transmitter, pressure transmitter, base frame, etc.


  • Operating limits up to 50 bar / 200 °C
    (725 PSI / 392 °F):
    suitable for a wide range of demanding operating conditions
  • Robust design with weld-pad type sightglass for optimum visual level monitoring
  • Modular system: combination possible with a wide range of system components

Standards and approvals

  • API 682 4th ed. Cat. 2/3 - 2CW-CW
  • API 682 4th ed. Cat. 2/3 - 3CW-FB
  • API 682 4th ed. Cat. 2/3 - 3CW-BB
  • API 682 4th ed. Cat. 2/3 - 3CW-FF
  • API 682 4th ed. Cat. 1 - 2CW-CW
  • API 682 4th ed. Cat. 1 - 3CW-FB

Functional description

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

- To pressurize the barrier/buffer chamber
- As leakage compensation
- Barrier/buffer 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 nitrogen for pressurization; pressurization is monitored by a pressure transmitter (default). The incorporated level transmitter issues a signal whenever the level of barrier/buffer fluid is too low.


Design, calculation and production in accordance with ASME VIII, Div. 1.
Variant with approval according to EU Pressure Equipment Directive PED 2014/68/EU available.

Inspections like ASME-U-Stamp by 3rd party on request.

Recommended piping plans

Product variants

Customized version including additional components.
Designation TSA6/TSB6 TSA6/TSB6
Design code ASME VIII, Div. 1
w/o U-stamp
Approval   PED 2014/68/EU
For shaft diameters >60 mm
(acc. to API 682)
Integrated cooling coil
Volume, vessel (liters) 26 26
Volume, tube (liters) 0.4 0.4
Allowable pressure – shell1) 50 bar (725 PSI) 50 bar (725 PSI)
Allowable pressure – tube1) 50 bar (725 PSI) 50 bar (725 PSI)
Allowable temperature – vessel1) -29 °C … +200 °C
(-20 °F … +392 °F)
-29 °C … +200 °C
(-20 °F … +392 °F)
Allowable temperature – system1) -29 °C … +200 °C
(-20 °F … +392 °F)
-29 °C … +200 °C
(-20 °F … +392 °F)
Liquid volume at NLL –
Normal Liquid Level (liters)
20 20
Working volume MAX-MIN (liters) 6.5 6.5
Cooling capacity –
without cooling water (kW)2)
1 1
Cooling capacity –
natural circulation (kW)2)
2.5 2.5
Cooling capacity –
forced circulation (kW)2)
6.5 6.5
Metal parts 316/316L 316/316L
Sight-glass Borosilicate Borosilicate
Net weight (approx.) 75 kg (165 lb) 75 kg (165 lb)

Other versions and connections (flanged, threaded, welded) on request.

1) Design data, permissible working values depend on the actual conditions of service.
2) The cooling performance depends on the available fluids, their temperatures and flow rates. Please contact EagleBurgmann for professional selection of a suitable version for your application.

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