Product Brand
Seal Systems
Accumulators - Bladder
About this product

The 682-53B dual seal barrier system is Flowserve’s most popular solution for mechanical seal barrier fluid systems. It’s available as an assembled to order (ATO) product available from key global production locations with standardized components and pre-engineered configurations and packages. ATO products benefit you with faster quotation, reduced lead times and lower costs.

... Read more Read less
  • Two construction options — buttwelded piping with Class 600 flanges and gate valves, or tubing with compression fittings and ball valves
  • 35-liter (10-gallon) bladder accumulator with carbon steel shell and off-shore duty paint, optional 316 stainless steel shell and/or low-temperature nitrile bladder
  • Preferred fixed alarm strategy or floating alarm strategy
  • Multiple pre-engineered seal coolers and instruments
  • Stainless steel stand with multiple heights
  • Sunshades included
  • Pre-engineered accessories such as a hand pump, heated accumulator blanket and accumulator isolation with pressure indicator


  • API Standard 682 (4th Edition)
  • ASME BPVC Section VIII Div. 1
  • Pressure Equipment Directive (PED) 2014/68/EU CSA B51

Operating Parameters

  • MAWP: 1240 psi @200F (85.5 bar at 93.3C)
  • MDMT: -49F (-45C)


  • Accumulator: stainless-steel or cabon steel construction
  • Bladder: Buna

Size Range: 9 U.S. Gallon (35-liter)


  • Carbon steel/Buna
  • Stainless steel/Buna


  • Piping with Class 600 RFBW
  • Tubing with NPT
Destination Innovation

Destination Innovation 2022

Join Flowserve's virtual expo on September 28 as our thought leaders and experts take you through a journey toward diversifying, decarbonizing and digitizing flow control for energy transition.



Find Flowserve representatives near you


Find your closest Flowserve resource for new products and replacement parts. We can help improve performance and safety throughout your operation.

Search Sales Contactsright-arrow

Searching for a service or repair for your equipment? Connect with a nearby Quick Response Center (QRC) to resolve problems and optimize equipment.

Find Servicesright-arrow

Are you looking for thought leaders with the expertise you need in your industry? We have industry and application specialists around the world who can assist you.

Locate Industry Expertsright-arrow