At the beginning of the new year in 2017, the company received an emergency call from Ningxia Ninglu Petrochemical Limited Weng Company. The DN500 expansion joint leaked in Ninglu Petrochemical Catalytic Workshop, sealed with pressure, temperature 530 degrees Celsius, pressure 0.5 MPa, medium for oil and gas (flammable and explosive), the situation was extremely critical, and the company personnel did not go to work (the Spring Festival holidays). The company immediately instructed the project manager to mobilize the elite troops and strengthen them. Flying to Ningxia Ninglu Stone Co., Ltd. within an hour, through intensive and orderly rush repair, the company successfully completed the pressure sealing rush repair task of Ninglu Petrochemical Expansion Joint, which ensured the safety of equipment and personnel in Ninglu Petrochemical Catalytic Workshop.