As explained by WhatIsPiping.com in the article “What is a Pipe Expansion Joint and Why Do I Need One?”, piping expansion joints—also known as expansion bellows—are critical components in modern industrial systems. These engineered devices absorb thermal movement and protect pipelines from stress while maintaining pressure containment. 

Expansion joints are used to manage dimensional changes caused by thermal expansion or contraction in piping, ducts, and vessels. The core component is the bellows, a flexible, convoluted element that expands and contracts to accommodate movement. Bellows are typically made of metal or rubber and can be either formed (from thin-walled tubes) or fabricated (assembled from welded discs using heavier materials). Both types are available in single-ply or multi-ply designs, depending on pressure and movement requirements.

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