June — 2011 — The Expansion Joints Blog


Archive for June, 2011

Universal Rectangular Expansion Joint for a Mining Operation

June 27th, 2011 Comments off

Universal Rectangular Expansion Joint for a Mining Operation

This universal rectangular expansion joint is fabricated entirely of carbon steel with COR-TEN™ steel bellows for a mining operation in the mountains of Chile. COR-TEN™ steel is high strength and ideal for resisting corrosion. It measures 73-1/4″ L x 52″ W x 96″ H, weighs 2,700 lb. and was painted with universal shop primer. This expansion joint was 100% dye penetrant tested, and a soap and air test was performed prior to shipment.

Single Expansion Joints

June 20th, 2011 Comments off

The single expansion joint is simply a bellows element with end connections. Regardless of accessories, such as liners and covers, it will deflect in any direction or plane that the bellows will. It is the least expensive type, but requires that the piping be controlled as to the direction of the movements required of the unit. The expansion joint should not be expected to control the movement of the pipe. If the piping analysis shows that the expansion joint must accept axial compression, then the piping must be guided and constrained so that only that movement will occur.

This expansion joint will not resist any deflections with any force other than the resistance of the bellows, which is a function of the spring rate times the deflection amount. It is incapable of resisting the pressure thrust along its axis, which is the product of the pressure times the effective, or cross sectional, area of the bellows. Large diameter units, even with low pressures, can generate very large axial pressure thrust forces, which must be reacted by main and directional anchors. Otherwise the expansion joint will extend with disastrous results.

Projects Including Single Expansion Joints:

605 Single Expansion Joints with Rectangular Plate Flanges and Weld Ends

605 Single Expansion Joints with Rectangular Plate Flanges and Weld Ends to be Installed in a Heater for a Delayed Coker Unit in Asia


12" Single Expansion Joints

12" Single Expansion Joints with 300 lb. Raised Face Flanges, and 316L SS Bellows and Tie Rods

24" SS Expansion Joints

24" SS Expansion Joints for a Process Line Containing Exhaust Gas and Hydrocarbon Vapor












Single Flanged Expansion Joint

Single Flanged Expansion Joint with 304 SS Bellows and Carbon Steel Flanges for an Exhaust Duct Application

3" Single Expansion Joints

3" Single Expansion Joints SS Bellows Desinged for a New Epoxy Resin Plant


90 inch Universal Flanged and Flued Head Expansion Joint and Duct Work Assembly

June 13th, 2011 Comments off

90 inch Universal Flanged and Flued Head Expansion Joint and Duct Work Assembly

This universal flanged and flued head expansion joint and duct work assembly is designed for a 90″ diameter line. It includes slotted hinge plates installed across the bellows to carry the weight of the duct between the bellows and equalize the axial compression between the two bellows. The flanged and flued heads, duct and weld ends are fabricated from 304 H stainless steel. The expansion joint is designed for 2″ axial compression, 2-1/2″ lateral deflection, and 1150°F at 5 PSIG. A spot x-ray test, soap and air test, and 100% dye penetrant exam were performed prior to shipment.

Check out some of our recent experience with duct work and expansion joint projects

June 1st, 2011 Comments off

U.S. Bellows provides custom designed expansion joints in duct work and fabricated duct work assemblies. The assemblies may include fabricated elbows, tees, and straight sections of duct work, in carbon steel or stainless steel, and in diameters of 42″ or larger. The duct sections can include fabric or metallic expansion joints and can be rectangular or round. U.S. Bellows can also provide specialized pipe supports and spring hangers for large diameter duct work. Additionally, we offer complete pipe stress analysis of your duct systems using CAESAR II software.

View recent duct work and expansion joints:


Duct Work Photo Gallery

Categories: Duct Work Tags:

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Our Parent Company: Piping Technology Pipe Supports, Pipe Clamps, Pipe Hardware & Insulated Pipe Shoes
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 Pipe Shields: Pre-Insulated Pipe Supports, Slides, Guides & Anchors

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