Inspection of expansion joints before leaving the factory

    Expansion joints require a series of strict inspections before leaving the factory to ensure that their quality, performance, and safety meet the design requirements. These inspections mainly include the following aspects:

    Firstly, a detailed inspection should be conducted on the size and position of the expansion joint to ensure that it meets the requirements of the design drawings and specifications. This involves key dimensions such as the length, width, and height of the expansion joint, as well as its accurate installation position in the pipeline system.

    Secondly, check whether the materials used in the expansion joint comply with relevant standards and specifications. Especially for metal expansion joints, it is necessary to check whether their metal materials comply with relevant standards to ensure that they have good strength, corrosion resistance, and high temperature resistance.

    Next, conduct a comprehensive inspection of the appearance of the expansion joint. This includes checking whether the surface of the expansion joint is flat, whether there are defects or protrusions, and whether there are cracks, deformations, and other conditions in the expansion jointshell. 

    These visual inspections help identify potential manufacturing defects or damage.

    In addition, it is necessary to check the waveform of the expansion joint. The waveform of the metal expansion joint should meet the design requirements, including consistency in waveform height, wavelength, wave number, and other aspects. This helps to ensure that the expansion joint can expand and contract normally during operation, and plays an effective compensation role.

    Finally, conduct necessary performance testing. This may include pressure testing, leak detection, etc. to evaluate the performance and sealing of the expansion joint under working pressure. These tests help ensure that the expansion joint can function properly in practical use and meet the requirements of pipeline systems such as power plants and cement plants.

    After completing all inspections and tests, the expansion joint also needs to go through a strict quality control process to ensure that its quality and performance meet the factory standards. Only through this series of strict inspections and tests can the expansion joint be recognized as a qualified product and delivered for use at the factory.