Seal Support System

ANSI LITE Seal Support Systems

Liquid-lubricated dual mechanical seals require an external source of clean, cool lubricating fluid. The following barrier fluid reservoir systems create this enhanced sealing environment, enabling longer operational life for dual seals. 



Standard Options: 

ANSI Lite Seal Support System

API 682 Plan 52 / ANSI 7352– Used with Unpressurized Buffer Fluid

API 682 Plan 53 / ANSI 7353A– Used with Pressurized Barrier Fluid

  • Closed loop arrangement allows monitoring of inboard seal
  • Tank with aluminum tubular level gauge
  • ½” NPT bronze vent & drain ball valves
  • 304L stainless steel orifice union (Plan 52 arrangement)
  • 2½” dial 316L stainless steel pressure gauge (0-200 psi)

The WCS2  (Water Conservation System)

Flex-A-Seal WCS2 (Water Conservation system) arrangement utilizes the pressure available from the plant water line to pressurize the barrier fluid inside the reservoir. The brass check valve controls and maintains pressure during normal operation and in the event of water line interruption, protecting the plant’s water supply from process contamination. The bronze sight flow indicator enables visual confirmation if either inboard or outboard seal leakage has occurred. The WCS2 is a self-regulating system which can both refill and re-pressurize itself upon any mechanical upset. 

  • Tank with aluminum tubular level gauge
  • Bronze sight flow indicator
  • Brass water supply regulator with pressure gauge 
  • Brass air vent with float and check valve
  • 3-way brass ball valve
  • Nylon hose and stainless steel fittings kit
  • Brass check valve


ANSI Lite & WCS Barrier Fluid Reservoir

Capacity:3 / 4 gallons (11.4 / 15.1 liters)
Tank Materials:

304L stainless steel (ANSI Lite)

304L stainless steel with brass and bronze fittings (WCS) 

Max. Working Pressure: 219 psig at -20° to 100°F (15.4 kg/cm² at -29° to 38°C)

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.