API 682 Plan 53B/C
The MP53 series aligns with API 682 Plans 53B and 53C by supplying a liquid barrier fluid to a dual seal assembly at a higher pressure than the seal chamber.
Our barrier seal reservoirs are built to ASME Section VIII standards and ASME U code stamps are available. All our barrier fluid systems, whether custom or standard designs are designed and built to the current API 682 requirements.

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Features
MP53B
Our MP53B unit supplies an external barrier fluid pressurized by a bladder accumulator. This sends clean barrier fluid to the dual seal at a pressure greater than the seal chamber.
- U stamp accumulator standard
- 5-10 gallon capacity
- Air- or water-cooled availability
- Integral barrier fluid make-up pump
MP53C
The external barrier fluid is pressurized by a piston accumulator and supplies clean barrier fluid to the dual seal at a pressure greater than the seal chamber.
- Integral head porting eliminates pigtail design
- U stamp coded vessel design
- Magnetic level indication available