Non-metallic expansion joints (also known as non-metallic compensators) are primarily used to absorb thermal expansion and contraction, vibration, and displacement in piping systems, and are typically used in high temperatures or corrosive environments. They are made of flexible materials such as fluororubber, silicone rubber, polytetrafluoroethylene (PTFE), and others, which have good temperature resistance and chemical stability.
The assembly steps of the non-metallic expansion joint are as follows:
Inspection materials：
Ensure that all components (flanges, bolts, washers, expansion joint bodies, etc.) are undamaged and match the design drawings.
Check whether the size and material of the non-metal expansion joint meet the requirements.
Clean up：
Clean the surface of the flange and the connection area at both ends of the expansion joint to ensure there is no oil, rust or foreign matter.
Installation spacer(if applicable):
Place appropriate gaskets on the flange contact surfaces to ensure a seal.
Install expansion joint：
Align one end of the expansion joint with the flange on one side and bolt it in. Ensure that the axis of the expansion joint is in line with the axis of the pipe.
Repeat this step to attach the flange on the other side to the other end of the expansion joint.
Centering：
Use hoisting equipment or manually adjust to ensure that the expansion joint is centered with the pipes on both sides to avoid eccentric loads.
Fastening bolts：
Use a torque wrench to tighten the bolts evenly at the manufacturer's recommended torque value. Generally, it is necessary to pre-tighten to a certain torque first and then tighten again to the final torque.
The bolts should be tightened in a cross or diagonal manner to ensure that the flange is evenly stressed.
inspect：
After completing assembly, check that the expansion joint is fitted in the correct position, that the bolts are tightened in place, and that there are signs of leakage.
Stress testing(if applicable):
Before the system is put into operation, stress tests are performed according to specifications to ensure the integrity and safety of the system.
Remember to follow specific guidance and safety regulations provided by the manufacturer throughout the process, especially when handling high temperature or corrosive media. If unsure of any steps, it is best to consult a professional engineer or technician.