LOTO - Lock Out/Tag Out
Lock Out Tag Out is a way to harm energy isolation and a control method used to prevent the damage caused by accidental start or energy release of equipment during maintenance, repair, adjustment and cleaning. Now people are used to saying "Lock Out Tag Out" or "Tag locked". In fact, this part should be called "hazardous energy isolation", which is more comprehensive. The national standard is "hazardous energy control method", which is quite reasonable (GB/T 33579). However, it will be relatively difficult for new employees of EHS to master the content of this section, because it is closely related to equipment and process. Many details may be difficult to understand if there is no visual thing to learn or on-site understanding.
First, how to understand the unexpected start-up and energy release of the equipment. The diagram below. If the fan in the workshop is broken, and the fan is on the roof or in some other high place, maintenance personnel need to go up and repair it. People with a little safety awareness will go to the electric cabinet to turn off the empty fan. If at the time of maintenance personnel maintenance, don't know someone already have other workshop personnel in the maintenance (maintenance personnel on the roof might not), some people see the fan is fixed, and stuffy and hot in the workshop, thought not open, may not even think about the electrical cabinet switch up, the maintenance personnel may hand or other parts of the body is near the blades, the fan was suddenly start, maintenance staff may be injured or even killed. A large proportion of serious workplace injuries are directly related to the failure to properly isolate hazardous energy, which is why LOTO or hazardous energy isolation is one of the survival principles of many companies.