Good morning everyone! It is my pleasure to give a presentation here.As a student whose major is safety engineering, I’d like to introduce a safety evaluation method today, the LEC evaluation.As the PPT shows, my presentation is mainly divided into three parts.Firstly, let me introduce LEC briefly.Maybe some of you have learned about LEC in college, it is used to ae the degree of danger when people work in potentially dangerous environment.It is a half-quantitative safety evaluation method which claifies one certain system and determine if the system is safe enough.
Then, what does each letter mean?D means danger, it shows how dangerous the system is.L means likelihood, it shows the poibility of the accident.E means the extent of exposure, it shows that how often do workers work in dangerous environment.C means consequence, it shows the severity of accidents.Here ,it is a chart, each part is divided into several levels.Take the likelihood as an example, it has seven levels, the points range from 0.1 to 10 as the poibility rising.And if the score of D is over 320,itmeans this system is extremely dangerous and cannot continue operating.Through LEC evaluation, we can make sure if we need to rectify and reform the workplace, so that we can take some measures for safety to avoid accidents.It is easy to use and it is feasible for the situation which is lack of specific evaluation models or data.The LEC method is widely used in various fields, such as aircraft industry, railway industry, metallurgic industry, coal-mining industry and so on.The usage of LEC doesn’t have many differences.Firstly, we should select the evaluation unit, thenidentify the main danger in the unit.Next , we need to evaluate the danger by using that chart and get a conclusion .
