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What’s the difference between a single and multi-layer bellows?

If you use a two-ply bellows, each ply can be designed for the full temperature and pressure conditions so that if the inside ply were to fail, you would still have the outside ply to carry the design pressure and temperatures.

Hinged Expansion Joint with Two-ply Bellows
Hinged Expansion Joint with Two-ply Bellows
 
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