- Metallic expansion joint/
- PTFE expansion joint
Expansion joints are employed in piping systems to absorb different thermal expansion while containing the system pressure. The utility model is composed of a bellows, an end pipe, a bracket, a flange, a conduit and other accessories that form the main body of its work.It belongs to a compensation element.They are successfully utilised in refineries, chemical plants, fossil and nuclear systems, heating and cooling systems, and cryogenic plants.
Any pipe connecting two points is subject to numerous types of action which result in stresses on the pipe.Some of the causes of these stresses including:internal or external pressure at working temperature,weight of the pipe itself and the parts supported,movement imposed on the pipe sections by external restraints,thermal expansion.
The stress on the wall of piping is related to the force or movement exerted on it by external resistance and the flexibility of the pipe itself.
When either the value of the stresses or the value of the external forces or movements exceeds the maximum allowable value(s), the flexibility of the pipe must be increased artificially. This can be done either by altering the layout of the pipe or by inserting high flexibility sections.
This is precisely the function of expansion joints.