STDCrude unit 4-inch pipe sulfidation thinning rupture -> naphtha leak and fire
Underestimated high-temperature sulfidation corrosion rate + inadequate wall-thickness monitoring
The recorded code STD 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.
fouling_pluggingCorrosion Thinning corrosion_thinningErosion erosionStress Corrosion Cracking (SCC) sccFlow-induced Vibration Fatigue (Tube) flow_induced_vibration_fatigueExpanded Joint Leak expanded_joint_leakTube Sheet Corrosion tube_sheet_corrosionTube Hole Enlargement tube_hole_enlargementCladding Disbonding cladding_disbondingPartition Leak partition_leakChannel Flange Leak channel_flange_leakShell Internal Corrosion / Erosion fmShell Crack fm_2Baffle Corrosion / Wear -> Loss of Tube Support fm_3Baffle Vibration Fatigue fm_4Fatigue Cracking fatigue_crackingCorrosion Thinning fm_5Gasket Aging / Creep -> Leak fm_6Improper Gasket Installation fm_7Bolt Relaxation bolt_relaxationBolt Corrosion fm_8Valve Internal Leak fm_9Blockage fm_10Relief Valve Set-pressure Drift fm_11Valve Seat Leak fm_12Inlet Line Blockage fm_13Sensor Drift fm_14Loose Wiring / Terminals fm_15Fouling/Plugging fouling_pluggingCorrosion Thinning corrosion_thinningErosion erosionStress Corrosion Cracking (SCC) sccFlow-induced Vibration Fatigue (Tube) flow_induced_vibration_fatigueExpanded Joint Leak expanded_joint_leakTube Sheet Corrosion tube_sheet_corrosionTube Hole Enlargement tube_hole_enlargementCladding Disbonding cladding_disbondingPartition Leak partition_leakChannel Flange Leak channel_flange_leakShell Internal Corrosion / Erosion fmShell Crack fm_2Baffle Corrosion / Wear -> Loss of Tube Support fm_3Baffle Vibration Fatigue fm_4Fatigue Cracking fatigue_crackingCorrosion Thinning fm_5Gasket Aging / Creep -> Leak fm_6Improper Gasket Installation fm_7Bolt Relaxation bolt_relaxationBolt Corrosion fm_8Valve Internal Leak fm_9Blockage fm_10Relief Valve Set-pressure Drift fm_11Valve Seat Leak fm_12Inlet Line Blockage fm_13Sensor Drift fm_14Loose Wiring / Terminals fm_15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