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Single Expansion Joints

June 20th, 2011

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


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