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42″ Dia. Hinged Universal Expansion Joint Designed with Pantographic Linkage
August 4, 2014

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This 42″ dia. hinged universal expansion joint was designed with pantographic linkage flue gas application in a Columbian refinery. The redundant two-ply testable bellows are fabricated from Inconel 625 LCF and the remainder of the assembly was fabricated with refractory lined carbon steel. It is designed for an axial movement of 1.1″ at 1,000°F and 50 psig. All welds were 100% dye penetrant examined, the bellows longitudinal seam and pipe seams were 100% X-ray examined. The complete assembly was pneumatically tested to 50 psig due to the internal insulation. All the pressure bearing components such as the hinge plates, pantrographic linkage, gimbal ring and hinge support rings were designed and engineered per latest EJMA, ASME B31.3 codes

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42″ Dia. Single Expansion Joint Refurbished for a Chemical Plant
December 7, 2013
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This 42″ dia. x 13-3/4″ OAL single expansion joint was refurbished for a chemical plant. The bellows were replaced with 304 stainless steel and the flanges were sand blasted and painted. The expansion joint was designed for a spring rate of 4,253 lb./in., 5/8″ axial movement at 222°F and 50 psig. A dye penetrant examination and air soap and bubble test was conducted prior to shipping.
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102″ Dia. Single Hinged Expansion Joint and Duct Work Assembly and Two 92″ Single Expansion Joints
February 4, 2013
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U.S. Bellows designed a 102″ dia. single hinged expansion joint and duct work assembly, along with two 92″ single expansion joints for a coal gasification facility in Mississippi. Both the assembly and expansion joints were fabricated from carbon steel with 304 stainless steel bellows, and designed for 3.6° angular movement at 825°F and 3 psig. The expansion joints were dye penetrant examined, 100% x-rayed and soap and air tested prior to shipment.

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Engineering, Design and Fabrication of 119″ Expansion Joints, Duct Work and Supports
June 25, 2012

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U.S. Bellows provided the total engineering, design, and fabrication package for this project including expansion joints, elbows, duct work, saddle supports, F-type variable spring supports, slide plates, and pipe anchors.

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A total of twelve, 119″ dia. double-slotted hinged expansion joints, thirty-six, 72″ dia. elbows, and twelve, 119″ dia., 55″ long header ducts were fabricated for a power plant in Mississippi. The expansion joint assemblies were designed for .5° angular movement, 3/8″ lateral, 1-1/2″ axial compression. The design conditions were 5 psig at 300°F. The duct work was fabricated from A-36 carbon steel material and the bellows were fabricated from 304 stainless steel. A dye penetrant exam, soap and air test, and spot x-ray on all duct seam welds were performed prior to shipping.

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76″ dia. Single Tied Expansion Joint for a Hot Blast Valve in a Steel Mill
November 7, 2011

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This single tied expansion joint is custom designed with Inconel® 825 bellows with carbon steel flanges, liners and pipes. It is 76″ I.D., 90″ O.D. and is 31-1/2″ long. It was designed for 1,900°F at 100 psig with 1″ compression. A meshed expanded metal cover was installed to allow for hot air to escape. Tests performed included a 100% dye penetrant, x-ray, and ultrasonic on pressure bearing welds. Finished units were hydro-tested at 1.5 times the design pressure. The expansion joints were designed with an inner liner to accommodate for easier field installation of refractory lining.

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Tied Universal Expansion Joint for Pipe Carrying Sulfur Dioxide
October 25, 2006

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This tied universal expansion joint is designed to carry hot gas up to temperatures of 1022°F and pressure up to 5 PSIG. It has a 66″ inside diameter and is 72″ in overall length. The design movements are 4″ lateral and 4.5″ axial compression. The bellows’ material is Inconel® 825 with carbon steel weld ends. The bellows and pipe longitudinal weld seams were 100% x-rayed prior to a 5 PSIG air test and then dye-penetrant examined after testing.

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Two Expansion Joints for an Air Intake on a Generator Unit at a Packaged Power facility in Houston.
July 11, 2006
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87025b expjt (1) These 59″ x 39.5″ fabric expansion joints were fabricated using a 1/8″ thick neoprene sheet. The joints were then bonded to the carbon steel angles and plates, and secured using stainless steel band clamps, with T-bolt latches. The carbon steel angles and plates were primed and finished at U.S. Bellows, Inc.’s paint production facility.

The expansion joints were designed to facilitate any vibration and movement during the generator units’ normal operation.

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60″ Ductwork with Spring Supports, Snubbers, a Support Cradle and a Fabric Expansion Joint
June 7, 2006

60” Ductwork with Spring Supports, Snubbers, a Support Cradle and a Fabric Expansion Joint for a Sulfuric Acid Plant in Texas

60” Ductwork with Spring Supports, Snubbers, a Support Cradle and a Fabric Expansion Joint for a Sulfuric Acid Plant in Texas

U.S. Bellows, Inc. and PT&P combined to furnish a fabric expansion joint, duct work, a spring support cradle and snubbers. US Bellows furnished a fabric expansion joint with acid resisting fabric and also a duct work measuring 34″ long and 60″ in diameter which was fabricated from ASTM A 516GR 70 carbon steel. PT&P furnished spring supports, carbon steel cradle supports, and snubbers. The expansion joint was completed within 6 weeks in time for a plant shutdown. A computerized pipe stress analysis, utilizing the Caesar II stress program, was performed to obtain the forces and moments imposed on the equipment nozzles and weights to be carried by the spring supports.

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