Table 4 Description of basic events and probability obtained from fuzzy.

From: Quantitative risk estimation of CNG station by using fuzzy bayesian networks and consequence modeling

Token

Basic event

Probability of failure

Token

Basic event

Probability of failure

X1

Not up-to-date technology

0.00175388

X31

Requirements for conducting training classes by managers

0.00133352

X2

Lack of maintenance

0.00166341

X32

Fatigue

0.00102329

X3

Unsafe equipment

0.00174181

X33

Shift work

0.0012942

X4

Type of ignition material

0.00151356

X34

Stress (internal causes)

0.00151356

X5

The nature of the chemical substance

0.00149968

X35

Stress (external causes)

0.0012942

X6

Inspection defect in wear detection

0.00149968

X36

Not having enough experience and skills

0.0015417

X7

Improper use of the equipment

0.00149968

X37

Hearing loss (non-occupational causes)

0.0012331

X8

Leakage

0.00141579

X38

Hearing loss (occupational causes)

0.00120781

X9

High temperature

0.00125603

X39

Failure to notify the control room in time

0.00185353

X10

Low temperature

0.00110154

X40

Fear of explosion and fire by operator

0.0013213

X11

Horizontal wind speed

0.00157036

X41

Operator performance (temperature and humidity)

0.0012331

X12

Vertical wind speed

0.00133352

X42

Chemical pollutants (particles)

0.00103276

X13

Environmental stability and instability

0.00148594

X43

Chemical pollutants (gas and steam)

0.0010666

X14

Sunny hours

0.0011722

X44

Solid waste

0.00115878

X15

Relative humidity and evaporation rate

0.00140281

X45

Liquid waste

0.00108893

X16

Lighting

0.0013213

X46

Adjacent commercial use

0.00130918

X17

Landslide

0.0012331

X47

Adjacent residential use

0.00115878

X18

Flood

0.00128233

X48

Adjacent industrial use

0.0012942

X19

Earthquake

0.00148594

X49

Land uses changes

0.00142889

X20

Land settlement

0.0012942

X50

Room metering (measurement of changes)

0.00127057

X21

Deliberate vandalism

0.00145546

X51

Room metering (operator error

0.0011246

X22

Incidents related to the missile site

0.00142889

X52

Lack of standard dryer quality

0.0013213

X23

Military attack

0.00155597

X53

Disturbance in the electricity flow of the dryer

0.00107895

X24

Explosion of other equipment

0.00115878

X54

Fire dryer heaters

0.0011246

X25

Deliberate error in the execution of the recipe

0.0012331

X55

Leakage of tank

0.0012942

X26

Accidental collision valves

0.00083946

X56

Adjacent tanks

0.00108893

X27

Failure to issue a work permit

0.00164816

X57

Dispenser leakage and damage

0.00130918

X28

Artificial lighting

0.00138676

X58

Disregarding dispenser safety signs

0.0010666

X29

Natural lighting

0.00144212

X59

Dispenser malfunction

0.0013213

X30

Lack of cost

0.00151356

X60

Improper management performance

0.00016326

Immediate ignition

0.00149968

Delayed ignition

0.00211349

  

Congested

0.0011722

Top event: leaked of CNG

0.054831905

  
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