U.S. Bellows custom designed these hinged expansion joints for a Polyolefin process which produces High-Density Polyethylene (HDPE) resin at a chemical plant. Polyolefins are a family of polyethylene and polypropylene thermoplastics. The job included expansion joints ranging from 12″ to 32″ NPS. The units pictured above have a nominal pipe size of 16″. The bellows and liner were fabricated from 304 stainless steel and the flanges, cover, and hardware from carbon steel. They are designed for an operating temperature of 176°F at 145 psig and 1° of angular movement. The expansion joints were 100% dye penetrant tested, the bellows longitudinal seam welds were 100% X-rayed, PMI examined, and hydro-tested prior to shipment.Read More
U.S. Bellows designed these hinged universal fabric expansion joints for a chemical plant in Delaware. The expansion joints are 84″ in diameter and 60″ OAL. The fabric belt is made with PTFE while the rest of the components are from carbon steel. The expansion joints are designed for an operating temperature of 650°F at 1 psig and 1/2″ of angular movement. The units were 100% dye-penetrate examined was performed prior to shipment.
U.S. Bellows, Inc. designed and fabricated two 44″ hinged expansion joints with 5″ thick refractory lining. These expansion joints are part of FCC stand-pipes in a synfuels plant. Each expansion joint is fabricated of two-ply Inconel® bellows and 3/4″ wall pipe. The joints consist of 2″ thick attachment rings. After fabrication, the expansion joints were pneumatically tested and inter-plies tested. The bellows and pipes were 100% x-rayed and PMI tested.
Thermal and structural Finite Element Analysis (FEA) was performed on the expansion joints to ensure the product is structurally sound and determining the thermal profile helps to prevent polythionic corrosion on the bellows. Design calculations were performed for all hardware including lug rings, gussets, hinge plates, pins, etc.Read More
Expansion joint assembly during fabrication
Expansion joint assembly ready for shipment
U.S. Bellows, Inc. specially designed and manufactured a double hinged refractory lined expansion joint for a chemical refinery in Michigan. This expansion joint with an overall length of 40′-0″ has a 4″ thick refractory lining installed per UOP specifications. It also consists of testable two plies SB-443/Inco 625LCF bellows, 5/8″ thick, A516-70 mitered elbows, 5/8″ thick, A516-70 spool, A240-304 liners, A516-70 hinges, A193, GR 7 tie rods, and A516-70 lugs.
This expansion joint is designed for 50 PSIG and 1440°F with 3″ of lateral movement per B31.3 and EJMA standards. To ensure quality, 100% X-Ray and 100% dye-penetration tests were performed on the bellows after forming. A pneumatic test at 75 PSIG was conducted on the expansion joint assembly prior to shipping.