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Axial expansion joints and their variants

Feb. 16, 2022

Axial expansion joints are expansion joints that absorb mainly longitudinal movements axially along a straight section of pipe.

 

Axial expansion joint flared flanges and guide sleeve

Axial expansion joint flared flanges and guide sleeve

 

Advantages of axial expansion joints

Simple means of compensation

►Smaller space requirements

►No alteration of flow movement

►Movement possible in any direction

►No redirection of pipe work required

►Low unit costs

 

Disadvantages of axial expansion joints

►High axial forces at higher pressures

►Strong fixed points and good axial pipe guides required

►Small and medium movement absorption

►For large expansion movements several axial expansion joints are required

►On long stretches many fixed points and pipe guides are required

 

Axial expansion joint variants
Connection partsAxial expansion joints can be manufactured with weld ends, fixed flanges or swivel flanges or combinations thereof, depending on customer requirements
Guide tubesTo avoid abrasion and turbulence (e.g. at high flow rates in pipe work systems), axial expansion joints can be equipped with inner guide tubes
Outer protection tubeTo protect the metal bellows against mechanical effects from the outside, axial expansion joints can be equipped with outer protection tubes
One or two bellowsAxial expansion joints can be manufactures with one bellows or two bellows that are connected by a central tube 


 Simplified graphic representation of a expansion joint in axial movement  

 Simplified graphic representation of a expansion joint in axial movement

 


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