In the 800000 ton/year ethylene project of Fushun Petrochemical, the expansion of 800000 ton/year ethylene engineering public works and auxiliary facilities of Fushun Petrochemical Company, the 300000 ton/year polypropylene project, and the chemical cleaning project of the 1.8 million ton diesel hydrogenation refining unit, our company successfully implemented all chemical cleaning work, including the steam generation system of 6 ethylene cracking furnaces, boiler feedwater system, and all SS, HS, MS line pipeline systems, condensate pipeline systems, compressor pipelines, and external pipelines; And undertook the chemical cleaning work of butadiene spherical tanks, pipelines, and other equipment in the tank area by China National Petroleum Sixth Construction Company.