Table 2.
Level decomposition table of causal factors in emergency responses.
| Total set | Criterion layer | Variable layer | Bottom layer |
|---|---|---|---|
| Causal factors leading to secondary accidents | Human factors | Human professional skills, knowledge, and literacy (F1) | Illegal operation (X11) |
| Not handling in time (X12) | |||
| Misjudgment (X13) | |||
| Management mechanism (X14) | |||
| Safety laws and regulations (X15) | |||
| Material factors | Inherent object or equipment (F2) | Tank broken (X21) | |
| Valve broken (X22) | |||
| Flange broken (X23) | |||
| Oil pipelines broken and leakage (X24) | |||
| Floating plate damage (X25) | |||
| Power-supply system and water system broken (X26) | |||
| Firefighting facilities (F3) | Not setting firefighting facility (X31) | ||
| Firefighting facility failure (X32) | |||
| Fire water system failure (X33) | |||
| Unreasonable setting of fire dike (X34) | |||
| Drain valve failure (X35) | |||
| Small fire separation (X36) | |||
| Environmental factors | Environmental issues (F4) | Reburning or reblasting of high-temperature oil (X41) | |
| Oil leakage and spillage (X42) | |||
| Blast wave and radiant heat (X43) | |||
| Weather factor (X44) |