ANSI PLUS Seal Support System

ANSI PLUS Seal Support System

Flex-A-Seal’s ANSI PLUS seal support system is designed for operation with API 682 Piping Plans 52 & 53A (ANSI 7352 & 7353A.) The barrier or buffer fluid can be circulated between seal and reservoir with a seal-internal circulation feature (i.e. a pumping ring), or by relying on the thermosiphon effect. Seal leakage can be monitored with the armored weld-pad sight level gauge which indicates whether the closed-loop system is losing or gaining fluid.

The ANSI PLUS range of reservoirs have a MAWP 350 psig at -20 to 200°F and are hydrostatically tested at 525 psig for maximum system safety in a broad range of ANSI/ASME B73.1 sealing applications.


Standard Options:

  • Stainless steel orifice union (Plan 52 arrangements)
  • Reservoir supplied with vent and drain valves
  • Multi-port block and bleed valve for easy instrumentation maintenance

Additional Options:

  • 4½” 0–400 psig pressure gauge
  • Level switch
  • Pressure switch
  • ½” cooling coils
  • Transducers
  • Powder-coated stand
  • 316L and Carbon Steel tank construction also available

If you require an engineered seal support system or are interested in additional options to Flex-A-Seal’s ANSI PLUS seal support system, please contact our Applications Engineering team.



Capacity:3 / 5 gallons (11.4 / 18.9 liters)
Tank Material:304L stainless steel
Max. Working Pressure:350 psig at -20 to 200°F (24.6 kg/cm² at -29 to 93ºC)

Flex-A-Seal can advise or Customer can supply customized accessories to meet specific needs.

To control barrier fluid temperatures, all system options can be supplied with 316 stainless steel ½” cooling coils inside the tank.



Depending on your specific needs and application, Flex-A-Seal can help you identify the ideal products. Contact us to tell us about your needs and request a quote.