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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.
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. It is recommended that the hinges should be used in sets of two or three. The expansion joint hinges provide for angular movement and will resist pressure thrust forces.
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.
Applications
- Air, Steam, & Flue Gas Ducts
- Power Plants
- Chemical Industry
- Gas Turbine System
- Petrochemical Industry
- Primary reformer ducts & burners
- Steel Plants
References
- 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
- Steam Traps, Expansion Joint Maintenance Engineering, (retrieved 1 November 2010)
External links
- U.S. Bellows, Inc. http://www.usbellows.com
- American Society for Testing and Materials (ASTM) http://www.astm.org/
- Expansion Joint Manufacturers Association EJMA http://www.ejma.org