Table 5 Weighted values of keywords in group-level accidents (top 30)

1

Reactor

0.1028

11

Workshop

0.0470

21

Fan

0.0357

2

Scene

0.0777

12

Be on duty

0.0454

22

Conversion

0.0356

3

Coke quenching car

0.0648

13

Central control room

0.0449

23

Boiler

0.0356

4

Pressure

0.0640

14

Rotating speed

0.0426

24

Electric machinery

0.0355

5

Liquid level

0.0623

15

High-pressure cylinder

0.0424

25

Coke quenching

0.0349

6

Main operation

0.0598

16

Stop

0.0399

26

Lean liquid pump

0.0349

7

Scheduling

0.0548

17

Pure benzene

0.0399

27

Surge

0.0330

8

Coking plant

0.0542

18

Feedwater pump

0.0377

28

Propylene

0.0321

9

Compressor

0.0532

19

Check

0.0365

29

Lubricating oil

0.0318

10

Vibration

0.0504

20

Loading

0.0362

30

Pipeline

0.0317