Hinged expansion joints are the type of expansion joints that are restricted to rotate in a single plane. The hinged expansion joints are used to absorb the changes that are a result of piping thermal expansion or a contraction.
First of all, it is important to restrain the pressure thrust. Hinges are added to the edges of the expansion joints with the use of pairs of pins. This allows a crossing movement in a single plane, hence, restraining the pressure thrust, also preventing the expansion joint from diverting axially during compression and decompression as well. Therefore, the hinged expansion joints provide for angular movement and maintain pressure thrust forces They can be used without pairing but for better outcomes, it is suggested that they are used in sets of two or three.
Hinged expansion joints are flexible bellows used in piping systems. When used in isolation, these hinged expansion joints are restricted to the pure angular rotation because of its flexible joint hinges. When used in pairs or sets, the expansion joints will operate together consuming parallel deflection. Hinged expansion joints prove to be advantageous as they are typically compact in size and are structurally rigid.
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