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A hinged expansion joint is a metallic assembly, that can rotate in a single plane, used to absorb changes resulting from piping thermal expansion or contraction.[1]
Hinged Expansion Joint - U.S. Bellows, Inc.
They include hinges, attached to the expansion joint ends with a pair of pins, which allow angular movement in a single plane, restrain the pressure thrust, and prevent the expansion joint from deflecting axially, either in extension or compression.[2] It is recommended that the hinges should be used in sets of two or three.[3] The expansion joint hinges provide for angular movement and will resist pressure thrust forces.[4]
Individual hinged expansion joints used in piping systems are restricted to pure angular rotation by its hinges. As a pair, hinged expansion joints will function together to absorb lateral deflection. Advantages of hinged expansion joints are that they are typically compact in size and structurally rigid.[5]
^Standard Specification for Circular Metallic Bellows ASTM F1120 - 87(2010), (retrieved 1 November 2010)
^Hinged Expansion Joint U.S. Bellows, Inc.-Manufacturer, (retrieved 1 November 2010)
^Glossary of Terms U.S. Bellows, Inc.-Manufacturer, (retrieved 1 November 2010)
^Expansion Joints - Types & Selection Charisma Global Network Pvt., Ltd., (retrieved 1 November 2010)
^Standards of the Expansion Joint Manufacturers Association, Inc., Ninth Edition, p. 2-19
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