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U.S. Bellows custom designed these externally pressurized expansion joints for a pipeline in Kentucky. The bellows are fabricated from Inconel 625 LCF and all other components from carbon steel. The expansion joints are 4″ in diameter and 32″ OAL. They are designed for an operating pressure of 135 psig at 358°F with 3″ of compression. All expansion joints were hydro-tested prior to shipment. Externally pressurized expansion joints are suited for piping systems that require large amounts of axial compression or extension. In externally pressurized expansion joints, the bellows elements are arranged so that the media flow is on the external surface of the bellows. Externally pressurizing the bellows eliminates pressure instability as a limitation to the design and permits the absorption of large amounts of axial expansion.

These clamshell pipe spools were fabricated by U.S. Bellows for a section of the duct for a gas turbine installation. The units were constructed from ASTM A.240 type 321 stainless steel. The flanges had a 32 RMS machined faces for bolting up the flanges without gaskets. The spools were designed to be removed in four sections so that the spool could be removed and the turbine pulled back for maintenance. They are 85.5″ in diameter and 21.5″ in overall length. The units were designed for an operating temperature ranging from -40°F to 950°F.

These neoprene expansion joints were designed for a gas turbine application. Each expansion joint is 42″ ID and 7″ OAL. The frame was fabricated from A572 Gr.50 carbon steel, the clamps from 304 stainless steel, and the belt is reinforced neoprene. The expansion joints were designed for -20°F/+200°F with a +/- 100″ water column. A dye penetrant examination on the welds was performed prior to shipment.