U.S. Bellows offers all types of metallic expansion joints. Each type has advantages and limitations that can provide flexibility, load reduction, structural integrity and reliability required in a piping system.
Metal expansion joints can withstand the design temperatures and pressures, as well as provide the capacity necessary to absorb thermal growth of the piping system. The thermal movement required can be axial, lateral or angular. In some cases, the pressure thrust of an expansion joint must be restrained by the use of tie rods, hinges or a gimbal while allowing the bellows to move through its design deflections.
Learn more about the different types of metallic expansion joints:
U.S. Bellows, Inc. designed and fabricated single tied expansion joints for a pipeline in Alaska. The 12″ diameter expansion joints had an overall length of 12″ and the 24″ diameter expansion joint had an overall length of 14 1/2″.
The expansion joint assemblies are fabricated entirely from stainless steel. The design pressure of the expansion joints was 50 PSIG. They are designed with tie rods that do not permit axial movement, but allow for lateral movement up to 1/2″. The expansion joints will be used on a process line that contains exhaust gas and hydrocarbon vapor at a low concentration. It will connect an oil tank with a vapor control system. The expansion joints were 100% dye-penetrant tested and hydro-tested to ensure quality control.
18" Single Expansion Joints for an Offshore Oil Platform Under Construction in Korea
Close up of Bellows
These expansion joints measure 18″ in diameter x 11″ in overall length. Each expansion joint is fabricated with 300 lb. stainless steel raised face slip on flanges. The liner, cover, and tie-rods are fabricated from 316L stainless steel.
18" Single Expansion Joint
The design pressure is 403 PSI, and the design temperature is 200°F. Dye-penetrant tests, hydro-tests at 604 PSIG, and 100% x-ray tests of the bellows’ longitudinal weld seams were performed to assure quality.
605 Single Expansion Joints for a Refinery in Asia
Expansion Joint for a Refinery in Asia
U.S. Bellows, Inc. designed and fabricated 605 single expansion joints with a rectangular plate flange and a weld end. The expansion joints are 6″ in diameter and have an overall length of 15 3/8″. The design temperature was 525°F and the design pressure was 1 PSIG. Each expansion joint was 100% dye-penetrant tested and air & soap bubble tested. The expansion joints are to be installed in a heater for a delayed coker unit.
Expansion Joints for a Heat Exchanger Company in Japan
These expansion joints were fabricated from ASTM-A-240 Type 321 stainless steel bellows and liners. The shell material is ASTM-A-516 Grade 70. They are 32 diameter with an overall length of 26. Each joint weighs 280 lbs. They were designed for 150 PSIG at 650F with a travel capacity of 0.33 axial compression and 0.08 lateral deflection. These expansion joints absorb differential expansion between the shell side and tube side of a heat exchanger. They were hydrostatically tested to 208 PSIG to comply with the Japanese code, Ministry of Health, Labor and Welfares (MHLW) and the ASME Pressure Vessel Code Section VIII.
14 Single Reinforced Metal Expansion Joints for a Construction Company in Israel
These single reinforced expansion joints with equalizing rings are used in heat exchangers. The bellows are fabricated from ASTM B 443 Inconel 625 LCF. The weld ends and the reinforcing rings/root rings are carbon steel. The expansion joints are 52” and 57” diameter with an overall length of 15 ½” and 16 ½”. They are capable of moving 0.6” in extension at 158 PSIG at 300°F. The expansion joints were fabricated to ASME Section VIII. The bellows and pipe longitudinal weld seams were 100% X-Rayed. In addition, the expansion joints were 100% dye-penetrate examined and hydrotested to 205 PSIG for quality and performance assurance.
57 x 96 Rectangular Seal Expansion Joints for a Chemical Refinery in TX
U.S. Bellows, Inc. recently fabricated four rectangular primary flexible seal joints for sliding flanged connections. Designed at 2 PSIG for 1350°F, the seal joints provide for one inch of axial movement to prevent damage to flange connections. EJMA Standards and B31.3 code were used in the design and fabrication of these joints. The purpose of the rectangular seal expansion joint is to prevent leakage to outside of the burney windbox. The corners are double mitered to reduce stress. Inconel® 625LCF material was used in fabricating the bellows while A240 tp 310 material was used for the frame. An air test at 5 PSIG was implemented as well as dye-penetrant test to ensure product quality.
3,212 lb. Tied Universal Joint for an Oil Piping System Application in Nevada
U.S. Bellows, Inc. custom designed and manufactured a 5″ nominal diameter and 60″ long universal expansion joint for an oil piping system application in Nevada. This expansion joint consists of high strength Inconel® 625LCF bellows and A105 flanges. The expansion joint is designed for 1400 PSIG and 120°F per B 31.3 and the latest revision of EJMA standards. It is also designed to allow 4 1/2″ of lateral movement during operation. A 100% dye-penetrant and hydro-test at 2100 PSIG were preformed prior to shipment to ensure quality.
U.S. Bellows, Inc. recently refurbished a 3″ O.A.L. single bellow with flanges for a marine vessel in Texas. Within a two day span, the replacement bellow was fabricated, welded to the existing 5/8″ flanges, and shipped to the marine vessel to resume operation. The replacement bellow, fabricated from 321 stainless steel, is designed for 150 PSIG and 800° F with 0.66″ of axial movement. To ensure quality, a 100% dye-penetrant test and a soap leak test were performed prior to delivery.
6” Diameter Tied Universal Expansion Joints for a Steam Reformer Project in Virginia
Close Up View
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.