The essence of ensuring safety

The essence of ensuring safety

The essence of ensuring safety is to control energy, such as chemical energy, electrical energy, mechanical energy, gravitational potential energy and so on. We need to use various means, including PPE and safety protection facilities, so that these energy can not be directly applied to our human body.
We take an example, zhang SAN in the pipeline (medium acid) as maintenance work, but the valve in the far away places, he spoke ahead of the valve closed, but not for Lockout tagout operations, li si in the process of patrol, unknown situation, found the valve closed, the valve opens, directly lead to chemicals, zhang SAN acid burn.
These are examples of failing to properly control energy.