Abstract: In chemical industry, especially in large-scale refining and chemical enterprises, due to the production demand, it is inevitable to carry out some local overhaul, maintenance, installation and cleaning and so forth. If the valve or switch is opened carelessly, it will cause the failure of energy isolation which will lead to flammable and explosive, toxic and harmful media, electrical energy, mechanical energy and other energy accidental release, thus causing safety accidents. The implementation of management measures such as energy isolation, locking and tagging will enable effective isolation of equipment under maintenance or operation, preventing accidents and eliminating personnel injuries from the root. This is beneficial exploration and practice for chemical enterprises to prevent the injury to maintenance workers during production process, to promote the visual management of production site and to realize the intrinsic safety of chemical maintenance.

Key words: refining and chemical enterprises, energy isolation, lock listing, practical application