Introduction of Metal Expansion Joints

Thermal growth, equipment movement, vibration or pressure pulsation may generate movement in a piping system. When this movement is not absorbed by the piping system itself, an expansion joint is the perfect solution.

An expansion joint is a device primarily formed by flexible bellows used to absorb movements in a piping system while containing pressure and a medium running through it.

The basic advantages to be gained from using Expansion Joints are:
1)  Little space required for installation.
2)  Absorption of movements in multiple directions due to their inherent flexibility.
3)  They require no maintenance.
4)  They reduce load and temperature loss to a minimum.

There are three basic movements that can be absorbed by an Expansion Joints: Axial, Lateral and Angular.
Axial Movement Angular Movement Lateral movement
Axial movement is the change in dimensional length of the bellows from its free length in a direction parallel to its longitudinal axis. Angular movement is the rotational displacement of the longitudinal axis of the bellows toward a point of rotation. Lateral movement is the relative displacement of one end of the bellows to the other end in a direction perpendicular to its longitudinal axis.

Manufacture and Design
Quality Control and Testing
Metallic Expansion Joints Types
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