Expansion joints: a crucial component in a piping system

What are expansion joints?

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Expansion joints are applied as a flexible pipe section for compensating movements and vibrations in the pipe. The use of expansion joints reduces stress in the pipeline and in connected equipment. In case of vibration, the vibration source is isolated, reducing stress on the rest of the system and reducing noise.

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Different types of expansion joints

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Expansion joints are available in four basic designs:

• Rubber expansion joints
• stainless steel expansion joints
• PTFE Expansion joints
• Tissue expansion joints

The different versions have specific characteristics and are therefore used in different applications. Each type of expansion joint is suitable for a particular combination of pressure and temperature. For example, fabric expansion joints are suitable for high temperatures i.c.w. low pressures, while stainless steel expansion joints are suitable for a very wide range.

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The selection of expansion joints

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Based on the medium, temperature, pressure and movement in the pipe, the appropriate expansion joint is selected. Furthermore, it is important to know what installation length is available and desired.

A universal -also called ''unstressed'- expansion joint can accommodate axial, lateral and angular movements. In addition to this basic design, Hanwel can supply chamfered expansion joints which can accommodate only one of the above movements or a combination.

Approximately 95% of the stainless steel expansion joints we supply are custom-designed solutions based on the input and wishes of our customers. With a quotation you will receive a technical design drawing from us as standard, including dimensions, applied standards, materials used and spring constants.

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