Skin technical requirements for non-metallic expansion joints primarily focus on all aspects of material performance, installation, and maintenance to ensure that the expansion joint can operate safely and reliably under a variety of operating conditions. Here are some key technical requirements:
Material selection：
The skin material should be selected according to the type of media, temperature, pressure and corrosiveness in the pipeline. Commonly used materials include rubber, polyurethane, polytetrafluoroethylene (PTFE), etc.
Materials must have corrosion resistance, abrasion resistance and suitable operating temperature range.
Adhesion：
The skin must be firmly attached to the substrate of the non-metallic expansion joint to avoid detachment or peeling during operation.
Special adhesives or mechanical means of fixing may be required to ensure good adhesion.
Sealability：
The skin should have good sealing performance to prevent media or external substances from penetrating into the inside of the expansion joint and ensure the safety and efficiency of the pipeline system.
Abrasion resistance：
The skin material should be able to withstand the flow of media and possible mechanical shocks in the pipe to extend the life of the expansion joint.
Temperature adaptability：
The skin material shall be capable of maintaining its physical and chemical properties in the temperature range in which the expansion joint operates, whether in high or low temperature environments.
Stress tolerance：
The skin should be able to withstand both positive and negative pressures in the system, especially for applications under high pressure or vacuum conditions.
Multilayer structure：
The skin is usually composed of multiple layers of different materials, each with a specific function such as sealing, insulation, reinforcement, etc.
Installation Considerations：
When installing, the bolts should be extended from the center to the surroundings to prevent leakage and marked properly.
Ensure that the skin is not damaged during installation and that it fits tightly with the expansion joint frame.
Maintenance and inspection：
Check the condition of the skin regularly, especially when working in harsh environments or corrosive media.
For worn or damaged skin, it should be replaced in time to avoid leaks and accidents.
Economy and practicality：
Replacing the skin should be an economical and practical method, especially if the metal frame is still intact.
These technical requirements are designed to ensure that non-metallic expansion energy savings operate reliably over their intended lifetime, while also facilitating maintenance and replacement. In specific applications, relevant industry standards should be referred to to ensure that the skin meets the needs of the specific project.