How should the service life of corrugated expansion joints be extended?

Corrugated expansion joint is also customarily called expansion joint, or expansion joint, is a flexible, thin-walled, transversely corrugated device with expansion function, which consists of metal bellows and components. It can be expanded along the axis direction, but also allows a small amount of bending, mainly used in a variety of pipelines, it can compensate for thermal displacement, mechanical deformation and a variety of mechanical vibration generated by axial, angular, lateral and combined displacement, the role of compensation with pressure, sealing, corrosion resistance, temperature resistance, impact resistance, vibration and noise reduction functions, to reduce the role of pipeline deformation and improve the service life of the pipeline. Corrugated expansion joint is mainly used to use the effective expansion and contraction deformation of the elastic element of the corrugated compensator to absorb the size change of the pipeline, conduit or container from thermal expansion and contraction and other reasons of a compensation device, belongs to a compensation element. It has good corrosion resistance to meet the working of the bellows in different environmental requirements, and also has good welding performance to meet the needs of the bellows in the production process of welding process requirements, and it also has good plasticity to facilitate the bellows forming and processing, and through the subsequent processing of processing hardening, heat treatment, etc., to obtain sufficient hardness and strength. In the installation of the corrugated compensator, the elastic deformation to be applied to the pipe in advance to produce the expected initial displacement and stress, to reduce the initial thermal state of the pipe end of the force and moment due to the operation of the pipe state for the high temperature state, thermal expansion of the pipe bracket is relatively large, so in the construction of the pipe fixed points between the cold tightening, cold tightening of the displacement of the pipe operation state displacement of half, cold tightening and then the fixed points welded This is a very economical and reasonable construction method, so it is necessary to do a good job of cold tightening before installation, so as to help reduce the corrugated compensator work to withstand the displacement pressure generated by the thermal expansion of the pipe. Thus extending the service life of the corrugated compensator.
 
Corrugated expansion joint design, manufacturing, installation and operation management of multiple links consisting of reliability. Reliability should also be considered from several aspects. Selection of materials used in the selection of bellows in the heating network, in addition to the work, should consider the medium, working temperature and the external environment, we also take into account the possibility of stress corrosion, water treatment agents, cleaning of the pipeline affect the material, and on this basis, pointed out the material economy and the actual production of optimized bellows. Under normal conditions, the corrugated pipe material should meet the following conditions: 1 . High elasticity, tensile strength and fatigue strength to ensure that the bellows work. 2 . Good plasticity to facilitate the bellows forming process and to obtain sufficient hardness and strength by subsequent treatment process. 3 . Good corrosion resistance to meet the working of bellows in different environmental requirements.