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Unrestrained Metal Expansion Joints (HHWY)

Unrestrained Metal Expansion Joints also know as: Non-Tied Expansion Joint, Untied Expansion Joint. Assemblies not capable of restraining the pressure thrust of the system. The pressure thrust must be contained using main anchors or the connecting equipment. The simplest type of expansion joint consists of a single bellows element welded to end fittings, normally flange or pipe ends. The single bellows can absorb small amounts of axial, lateral and angular movement with ease, but adequate anchors and guides must be provided. Universal Unrestrained Expansion Joint assembly consists of two bellows connected by a center spool piece with flange or pipe ends. The universal arrangement allows greater axial, lateral and angular movements than a Single Bellows Assembly. Increasing the center spool length produces increased movement capability. Like the single, adequate anchors and guides must be provided.

Advantages:
* The most economical expansion joint
* Absorbs axial, angular and a small amount of lateral movement
* Will not absorb pressure thrust forces
* Must be adequately anchored and guided
* Available with weld ends or flanges or a combination of both