1. Purpose:目的 The purpose of this guideline is to establish requirements for the use of lockout devices and tags in preventing the start-up of machines or equipment, or the unexpected release of stored energy from such machines or equipment during repair, inspection or maintenance works performed by our employees or contractors. 建立挂牌上锁制度的目的是为了防止员工或合同方在设备检修、检查和维护时突然启动或储备能量源意外释放。