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Bellows basics: single ply, formed by punch mandrel, thin-wall. Cut into longitudinal segments once manufacture is complete. Ply thickness 0.7 mm (0.03”) ... 3.0 mm (0.12”).
Weld ends and/or rings: material selected to suit the application
European Pressure Equipment Directive (PED) 97/23/CE
Expansion Joint Manufacturers Association (EJMA)
ISO 9001:2008
Empfohlene Anwendungen
Petrochemical industry
Refining technology
Any application in any industry where an existing expansion joint is to be repaired without cutting or opening the pipe.
Funktionsbeschreibung
CB Clamshell expansion joints are cut into (most commonly two) longitudinal segments once their manufacture is complete. Because they have been cut, they can be installed around existing pipe with no need for the pipe itself to be cut or opened. Once the pieces are in place, they are welded together by expert welders, to create the whole expansion joint.
Hinweis
Quality control and testing options:
Full x-ray of bellows longitudinal seam weld before formation of convolutions.
Full dye penetrant test of bellows longitudinal seam weld inside and outside before and after forming of convolutions.
100 % dye penetrant test of bellows attachment welds (if applicable). This would be done prior to the expansion joint being split into segments.
Impact testing of weld ends
Hardness test
Positive Material Identification
Service:
Expert clamshell bellows welders available to perform these highly-specialized welds.
All field welds can be 100 % dye penetrant tested.
Welding teams able to work at height and in confined spaces, provided safety requirements are met.
Experienced supervision by our field service personnel available for overall expansion joint repair guidance.
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Designed for, and cover the mid temperature and pressure range for general process equipment.
Mainly for angular movements.
Tied metal expansion joints retain pressure thrust developed by internal pressure, through the use of hardware.