EJS has been designing expansion joints for heat exchanger applications, specifically shell and tube or floating head, for many years. Considered an expert in this application, EJS manufactures all code joints in accordance with ASME Section VIII, Div 1. and all our welders are ASME ® qualified. Appendix 26 requires a special code analysis that is provided with these high-pressure expansion joints and a third-party source inspection ensures the expansion joint is manufactured per code. When complete, all parts receive either a "U" or an "R" stamp depending on new construction or repair and a U-2A partial data report.

The convolutions on the bellows may be U shaped or toroidial depending on the design conditions. Design pressures range from full vacuum to 2500 psig with temperatures from -325 deg F to 1650 deg F. As a minimum, all code joints require 100 percent dye penetrant examination of the bellows longitudinal seams and attachment welds along with a hydrotest. Additional examination can be added such as x-ray, ultrasound, helium leak check and impact testing. All code joints are manufactured from a variety of SA and SB materials stocked at EJS. These materials require mill test reports and tracking so each part can be stamped with a unique serial number. This serial number contains a complete history of the expansion joints' materials and construction.