US Bellows successfully refurbished this double gimbal expansion joint for an oil refinery located in Baton Rouge, Louisiana, extending the service life of the existing equipment while restoring its performance and reliability. The expansion joint is being used on a tank to accommodate the differential settlement due to the immense weight of the tank and the piping connected to it. This refurbishment was completed in less than two weeks.
As part of the refurbishment, the overall length was modified due to settlement variations, and the original bellows were replaced with new bellows fabricated from Inconel® 625, a high-performance nickel-based alloy known for its exceptional resistance to corrosion, oxidation, and elevated-temperature service. The flanges, pipe and bellows reinforcements made of Carbon steel were replaced after inspection due to the corrosion and the criticality of the components, while the hardware components (gimbal box and supports) were all repaired and refurbished..
The expansion joint measures 20 inches in diameter with an overall length of 108 inches. It was designed to accommodate 4 inches of lateral movement while operating at temperatures up to 450°F and pressures of 180 psig.
To ensure compliance with the refinery’s quality requirements, U.S. Bellows performed a comprehensive inspection and testing program prior to shipment. The refurbished unit underwent 100% dye penetrant examination, Positive Material Identification (PMI) testing, and a hydrostatic pressure test to verify material integrity, weld quality, and overall performance.
This project highlights U.S. Bellows’ expertise in both the manufacture of new expansion joints and the refurbishment of existing units, providing customers with cost-effective solutions that improve reliability and extend equipment service life in demanding refinery applications.
