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:
There are three basic movements that can be absorb by an Expansion Joint:
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 logitudinal axis of the bellows to ward a point of rotation
Lateral movement is the relative displacemnent of on end of the bellows to the other end in a direction perpendicular to its longitudinal axis.