Due to their extraordinary properties expansion joints made with Polytetrafluoroethylene (PTFE) bellow material are used particular in applications with aggressive media and elevated temperatures. The designs as well as the operation conditions differ widely. This is the case especially for specifications concerning overall length, flange layout, diameter of support rings, movement range, guiding elements, wall thickness of the PTFE bellow and the minimal requirements of operating parameters like pressure/vacuum ratings.
This brochure provides information on standardized specifications regarding the design and operation limits and hence provides qualitative guidelines for the improvement of the operation reliability and prevention of sizing errors. The brochure is restricted to expansion joints whose bellows made of paste-extruded and sintered PTFE and contains recommendations of the Technical Guideline 12-0040 issued by the German “Interessengemeinschaft Regelwerke” (IGR).
This technical brochure is edited by the pro-K Fluoropolymergroup and was technically worked out by Robert Meyer zu Westram, SGL Carbon Group / Dr. Schnabel GmbH. The revision was made in the cooperation of SGL Carbon Group / Dr. Schnabel GmbH and Baum Lined Piping GmbH.
This brochure replaces the brochure with the same wording from August 2022.