U.S Bellows, Inc, the expansion joint division of Piping Technology & Products, Inc., recently designed and fabricated three elbow pressure balanced expansion joints for a power station in Canada.

These joints are designed at 150 psig and 450ºF to allow lateral and axial movements in a 42" steam line. Expansion joints were designed and fabricated per EJMA and B31.1 code. The expansion joints were hydrotested at 225 psig and 75ºF. In order to detect any leaks in the weld, prior to and following forming, bellows long seam welds and attachment welds were 100% dye penetrant tested.