U.S. Bellows designs two-ply bellows with 100% redundancy; therefore, if a leak occurs in the inner ply, the outer ply is designed for the full pressure and temperature. This design allows for the critical piping system to continue operating while plans for replacement can be formulated. This can prevent unexpected shut-downs saving valuable time and money.
Two-ply bellows also make it possible to pressure test and inspect for leaks during field inspections and in some cases, if conditions permit, the expansion joint can be tested while in service. Universal, hinged and gimbal are some of the common types of expansion joints that include two-ply bellows. Sometimes a wire mesh is used between the bellows to ensure flow equalization between the plies of the bellows.
Most expansion joints in oil refineries, especially FCC units use two-ply bellows, but they are also ideal for regenerated catalyst standpipe, spent catalyst standpipe, recirculation cooled catalyst flue gas piping and hot gas expanded piping. Contact our team to have your single bellows expansion joint refurbished to include two-ply bellows.
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44″ Hinged Expansion Joint with Refractory-lining and Two-ply Bellows
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55″ Refractory-lined Universal Gimbal Expansion Joint with Two-ply Bellows
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44″ Universal Expansion Joint with Refractory-lining and Two-ply Bellows
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