Table 1.

Statistics on causal factors and frequencies.

Causal factors	Frequency	Causal factors	Frequency
Illegal operation	3	Not setting firefighting facility	5
Not handling in time	6	Firefighting facility failure	25
Misjudgment	2	Fire water system failure	7
Management mechanism	79	Unreasonable setting of fire dike	3
Safety laws and regulations	59	Drain valve failure	2
Tank broken	54	Small fire separation	6
Valve broken	13	Reburning or reblasting of high-temperature oil	18
Flange broken	4	Oil leakage and spillage	45
Oil pipelines broken and leakage	10	Blast wave and radiant heat	63
Floating plate damage	10	Weather factor	14
Power-supply system and water system broken	8

Frequency refers to the occurrence times of each causal factor in the 122 accident cases.