FTSDelivery truck misconnected to incompatible-material tank -> exothermic reaction -> toxic vapor release (piping transfer/labeling deficiency)
Deficient transfer-connection design + unclear pipe labeling + human error (Harcros truck misconnected to MGPI incompatible tank)
The originally recorded code FTS is an ISO 14224 functional code but its semantics do not match the actual failure (see the Mapping block above); it has been corrected to ELP based on the accident narrative. ISO 14224 functional codes describe what the equipment failed to do; the damage mechanism (how it failed) is a different dimension.
internal_corrosion外腐蚀（External Corrosion） external_corrosion保温层下腐蚀 CUI（Corrosion Under Insulation） cui冲蚀-冲刷腐蚀（Erosion-Corrosion） erosion_corrosion死角/滞留区腐蚀（Dead-Leg Corrosion） dead_leg_corrosion热疲劳（Thermal Fatigue） thermal_fatigue振动疲劳（Vibration Fatigue） vibration_fatigue应力腐蚀开裂 SCC（Stress Corrosion Cracking） scc氢致开裂 HIC（Hydrogen-Induced Cracking） hic脆性断裂（Brittle Fracture） brittle_fracture高温蠕变（High-Temperature Creep） creep法兰-垫片密封泄漏（Flange/Gasket Leak） flange_gasket_leak焊缝缺陷/未熔合（Weld Defect） weld_defect水击（Water Hammer） water_hammer堵塞/沉积（Blockage/Deposit） blockage机械损伤/第三方破坏（Mechanical Damage） mechanical_damage