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Tianqing Company: LNG liquefaction unit repaired, operations resumed with improved efficiency. Author/Source: Date: 2018-08-10 Clicks: 66 From July 31 to August 2, through thorough preparation and organization, Tianqing Company carried out maintenance work on the LNG liquefaction unit; in particular, the final stage coolers of the refrigerant compressor units were replaced, yielding good results. After the defects were rectified, the LNG liquefaction capacity of this facility increased significantly compared to before the maintenance. This not only enhanced the company’s ability to adjust gas supply in response to fluctuations in demand, stabilized production loads, and ensured the stable operation of the entire production facility, but it will also generate greater economic benefits for Tianqing Company under the current market conditions. The LNG liquefaction plant operated by Tianqing Company is designed to handle 720,000 cubic meters of natural gas per day, with a daily LNG production capacity of over 500 tons. As a result of long-term operation, more than a dozen minor issues have gradually emerged in this plant; these issues not only severely affect its ability to operate at high loads but also increase its operational risks and reduce its inherent safety level. Among them, the leakage problem in the final cooler of the refrigerant compressor unit is particularly serious. This leakage leads to a significant loss of refrigerant, increases operating costs and safety risks, and also impairs the heat exchange between the refrigerant and cooling water. As a consequence, the thermal load on the cryogenic tank increases, reducing the plant’s capacity to liquefy natural gas. It has been calculated that due to this leakage in the final cooler, the plant’s production capacity is reduced by 40%, which has a significant impact on both the stable operation of the plant and its economic efficiency. After the maintenance work was completed and several days of operational monitoring were carried out, the production capacity of the LNG liquefaction plant has essentially reached the design specifications; the daily volume of liquefied natural gas produced amounts to 700,000 cubic meters. Meanwhile, all the process parameters of the plant are within acceptable ranges, with a 100% compliance rate for these parameters. This fully demonstrates that the maintenance work achieved all its intended objectives, thereby laying a more solid foundation for the company’s annual production and operational goals.