Pressurized barrier system (closedcircuit) for use in seal systems withhigh pressures and/or forhazardous/environmentally harmfulprocesses. The SBF (Plan 53B) rangeis available with a pressureaccumulator, cooler (finned tube, wateror air cooler with fan) and a wide rangeof instruments.Circulation in accordance withAPI 682 / ISO 21049: Plan 53B