The compound axial corrugated expansion joint, also known as the axial compound pull rod corrugated expansion joint, compound pull rod corrugated expansion joint, and compound pull rod metal expansion joint, is a specialized compensation device provided to users with low fatigue frequency and high compensation demand. The compound rod corrugated compensator is composed of two or more corrugated pipes and rods connected to the middle pipeline, end plates, spherical and conical surfaces, gaskets and other structural components. It has the characteristics of reasonable structure, large compensation, good sealing, strong corrosion resistance, and long service life, and has been widely used in high support and overhead laying of steam heating pipelines....
Single axial expansion joint, thermal expansion and contraction are natural phenomena, and expansion occurs as long as the temperature rises. For equipment that generates heat during operation, for example, the shaft of a large motor may generate heat and stretch during operation. Therefore, one end must be fixed and the other end must be free, otherwise the extended shaft will cause the casing to tip over. The thermal pipeline of cement enterprises also has this problem.Due to being installed in a cold state at room temperature, hot gas will inevitably cause its temperature to rise during the production process, resulting in thermal expansion and elongation. If expansion joints are not installed to eliminate or absorb pipeline elongation, it will inevitably cause damage to the structure or support, which should be given sufficient attention....
The reliability of expansion joints consists of design, manufacturing, installation, and operation management, and reliability should also be considered from these aspects. For the selection of corrugated pipes for heating networks, in addition to working temperature, working medium, and external environment, the possibility of water treatment agents, stress corrosion, and the impact of pipeline cleaning agents on the materials should also be considered. Based on this, the cost-effectiveness of the materials and the welding and forming of corrugated pipe materials should be combined to optimize the economical and practical corrugated pipe materials....