U.S. Bellows recently custom designed and manufactured three 12′ – 0″ x 8′ – 0″ rectangular expansion joints designed at 5 PSIG and 650 degree F. The expansion joints are fabricated with full radius corners which allow for an increased cycle life. The bellows are formed from Inconel 625 SB-443 GR. 1 and the rest of the assembly is fabricated from A516-70. The long seam welds were 100% X-rayed. A 100% Dye Penetrant test was performed on the attachment welds.