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Recently, the domestically produced high-pressure injection pumps used in Unit 3 of Guangdong Petrochemical’s refining facility have been in stable operation for over 5,000 hours; their service life exceeds that of imported equipment. The procurement cost has been reduced by approximately 65%, and more than 1.6 million yuan in repair costs can be saved each year. The high-pressure water injection pump is a key equipment in hydrocracking units; its function is to inject water into the high-pressure air cooler to prevent ammonium salt crystallization. It has a complex structure with many vulnerable components; once a failure occurs, water injection is interrupted, leading to ammonium salt crystallization in the high-pressure air cooler and corrosion of the heat exchange tubes. Moreover, the core technology of this pump has been monopolized by foreign countries, and key spare parts still need to be imported. This not only results in high procurement costs and long delivery times, but also problems such as spring breakage and seal failure in the inlet and outlet valve assemblies can significantly affect the stable and long-term operation of the device. To address the aforementioned challenges, Refining Department 3 has focused on developing technologies for the localization of spare parts. Yang Yuanpeng, assistant to the department manager, explained: “Making components domestically is no easy task; it requires very high standards in terms of surveying and manufacturing techniques, making substitution quite difficult.” At the beginning of 2024, we established a task force to explore innovations and tap into internal potential, making the localization of vulnerable spare parts a key focus for improving the quality and efficiency of our department. ” After the project was finalized, the R&D team from Refining Department 3 held numerous meetings to carefully compare the differences in manufacturing technologies between domestic and international practices, determine the specific aspects to focus on in the research, and address challenges such as the material requirements for imported spring wires, their mechanical properties, and the elasticity of the springs. Ultimately, after numerous tests and improvements, the wear-prone spare parts for the high-pressure injection pump have been able to operate stably on such pumps for over half a year; their performance parameters such as flow rate and vibration levels fully meet the requirements specified in the original pump design. Initial efforts to replace imported parts with domestic alternatives for these high-pressure injection pumps have thus proven successful.