Abstract: A natural gas purification plant commenced operations in 2014 and has undergone three rounds of major overhauls to date. Through conti-nuous refinement of its maintenance practices, the plant has developed seven key optimization technologies including amine solvent system regeneration, sulfur sweep, water filling and pressurization of de-sulfurization units, hydrotreating catalyst cooling, gas tightness testing in high-pressure sections, feed introduction, and flushing and water circulation runs. The implementation of these seven technologies can enhance inspection and maintenance technologies, streamline startup and shutdown procedures and establish clear acceptance criteria for critical steps. This contributes to achieving an effective integration of safety, efficiency and quality in the inspection and maintenance of high-sulfur natural gas purification units, while providing references for overhauls of similar facilities.

Key words: natural gas purificationlinspection and maintenanceloptimizationlstartup and shutdown