U.S. Bellows, Inc. recently designed and manufactured five tied universal expansion joints ranging in size from 30 to 48 for an oil and gas company in France. These expansion joints weigh between 2400 lb. and 3200 lb. and are fabricated from 304-321 SS bellows. They are designed for pressures ranging from 55 to 650 PSIG and 148°F to 300°F operating temperatures. To ensure quality, the joints were 100% X-Rayed, 100% dye-penetrant, and hydro-tested at 83 to 975 PSIG.
Tied Universal Expansion Joints > Blog Articles
U.S. Bellows, Inc. recently designed and manufactured eight 6″ diameter tied universal expansion joints with 24” F-F. These expansion joints are made from two-Ply Inconel® 625 bellows, A312 TP 304 spool, and A105 flange. They are designed for FV/50 PSIG and 300°F with axial and lateral movements of +/- 0.25″ and 0.70″, respectively. The joints were 100% X-Rayed, 100% Dye-Penetrant, and hydro-yested at 75 PSIG. Flanges, tie rod, and spherical nuts are hot dip galvanized per customer specification.
These expansion joints were designed at 170 PSIG and 450 degrees F. to absorb lateral movements and tested per B31.3. They were made with Inconel® 625LCF bellows and A105 300 lb. RFSO flanges. The entire assembly was hydro-tested at 255 PSIG and held under pressure for four hours. In order to detect any leaks, each expansion joint and its welds were subjected to the dye penetrant-test and the X-ray test, each of which were 100%, prior to and following forming.
U.S. Bellows, Inc., the expansion joint division of Piping Technology & Products, Inc., fabricated 28-inch and 32-inch O.D Tied universal expansion joints for an oil refinery in China. The expansion joints were fabricated from 321 SS bellows, A105, 150#, RFSO. EJMA Standards and B31.3 code were used in the design and fabrication of these joints.
U.S Bellows, Inc. manufactures 96, 3″ NPS tied universal bellows for a power plant located in Saudi Arabia. The bellows’ element is a unique design containing integral equalizing rings between the corrugations that provide excellent pressure resistance, as well as, anti-squirm resistance. The tear drop shape of the rings add little resistance to movement and cycle life is not compromised. Pressure design is based on 252 psi at 689° F with a lateral movement of 1.0″.