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Major maintenance was carried out on the York YCL screw compressor units used for the refrigeration of chlorine-alkali processes. By liquefying chlorine, it is possible to remove impurities from it, resulting in chlorine of extremely high purity that meets the requirements for various applications. At normal temperature and pressure, a certain volume of gas occupies a large space; however, when chlorine is converted into liquid chlorine, its volume **decreases**, which makes it easier to store it in containers and transport it over long distances. Overhaul of industrial cryogenic chlor-alkali York YCL screw compressors for chlorine liquefaction; chlorine liquefaction performance: 1. The chlorine liquefier uses high-efficiency bright carbon steel heat exchange tubes, which significantly reduces the corrosion of liquid chlorine on these tubes. 2. A slotted expansion joint is used between the heat exchange tube and the tube sheet, along with a seal weld, which ensures good sealing performance and effectively extends the service life. 3. A baffle is installed on the refrigerant inlet side of the chlorine liquefier to prevent liquid refrigerant from directly hitting the tube bundle, and it also helps to distribute the flow rate of the liquid refrigerant properly, thereby enabling efficient heat exchange. 4. High adaptability. Taking the customer’s application requirements into full consideration, the control box features a rainproof design, and the unit is suitable for outdoor operation ； It is also equipped with a refrigerant backflow prevention device to accommodate the installation of the unit at a higher position. 5. The chlorine liquefier features a dual safety valve design, allowing customers to conduct annual inspections of the safety valves without shutting down the unit. 6. Humanized design: the unit control box, control valves, level gauges, sight glasses, etc. are all located on the same side, facilitating operation by customers. Overhaul of industrial refrigeration chlor-alkali York YCL chlorine liquefaction screw compressor units; major overhauls for industrial refrigeration compressors. The failure symptoms of compressors are diverse – for example, the same type of failure can present different symptoms, while different types of failures may exhibit the same symptoms. This variability and diversity in failure symptoms make it difficult to identify the root cause of the problems. Therefore, it is necessary to carefully observe and analyze the fault symptoms, identify the main and typical aspects of them, and determine the time, location, and environment in which the fault occurred. Kuai Anjia Industrial Market: chlorine, PVC, polysilicon, fluorine chemicals, coal chemicals, petroleum and natural gas, etc. Overhaul of industrial refrigeration chlor-alkali York YCL chlorine liquefaction screw compressor units