Metal Expansion Joints

For over 100 years, Badger has been a leading manufacturer of metal bellows expansion joints and services

Metal Expansion Joint

From hundreds of penetration boiler seals to a highly-engineered, refractory lined metal expansion joint for catalytic cracking in a refinery, Badger Industries has experience with diverse installations and severe service applications. Our metal expansion joints are designed to the latest EJMA standards and range from 2” to 240” diameter for round designs and any practical size for rectangular designs; single-ply, multi-ply, root rings, equalizer rings, and toroid bellows designs are also available. Bellows material varies depending on application requirements, but austenitic stainless steels and nickel alloys are the most common materials used.

The bellows element, a thin-walled corrugated membrane, is the most basic component of a metal expansion joint and provides flexibility in a piping system while containing pressure and media. Expansion joints may contain one or more bellows and are frequently designed with anchors and pipe alignment guides to prevent bowing and buckling in a piping system. 

Metal expansion joints fall into (2) different basic categories; unrestrained assemblies and restrained assemblies. Unrestrained expansion joints are not capable of restraining pressure thrust in a system. Therefore, pressure thrust must be contained using main anchors or equipment. Restrained expansion joints use tie rods, hinges, and gimbal attachments to contain pressure thrust, but still require intermediate anchors to withstand the spring force generated when the assembly is deflected.

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