ELPQuench tower area discharge piping years of thinning/corrosion rupture, vinyl chloride + EDC mixture leaked and fired/exploded
Multiple piping modifications / incomplete MOC; accelerated corrosion rate not recognized; inspection requirements not updated; engineering clamp repair applicability not assessed
The recorded code ELP is an ISO 14224:2016 functional failure code (describes what the equipment failed to do). The damage mechanism (how it failed) is shown in the Mapping block above. The two are distinct dimensions in ISO 14224.
fmRefractory Lining Loss fm_2Nozzle Blockage fm_3Nozzle Corrosion -> Poor Atomization fm_4Packing Blockage / Fouling fm_5Pump Cavitation fm_6Mechanical Seal Leak fm_7Fouling -> Heat-transfer Loss fm_8Tube Bundle Corrosion Leak fm_9Level Gauge Blockage -> Overflow / Cavitation fm_10Blowdown Valve Blockage / Sticking fm_11内腐蚀（Internal Corrosion） 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