STDCO2 compression system scrubber dump valve stuck open -> liquid drawdown -> high-pressure CO2 migrated into closed-drain system -> Joule-Thomson cooling (-30F) froze/hydrated relief path -> carbon-steel closed-drain vessel overpressure 550-700 psig brittle rupture, debris ejected 1200 ft, control room heavily damaged
Scrubber level dump valve stuck open (common in winter) + Joule-Thomson cooling froze/hydrated relief path + closed-drain vessel design and overpressure protection inadequate + lacking pressure/temperature/level instrumentation; PHA did not identify ice-plug scenario
CSB 'Incident Reports Volume One' (2025-01-14) Accidental Release Reporting Rule compilation event; no standalone CSB investigation number, no traditional investigation page. Included under a transparent non-standard id, distinct from the other 21 conventional investigations.
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.
EVAP-C1-FM1焊缝应力腐蚀/裂纹 EVAP-C1-FM2管内结垢/结疤传热恶化 EVAP-C2-FM1管束点蚀穿孔 EVAP-C2-FM2管板泄漏 EVAP-C2-FM3分布不均→干壁过热 EVAP-C3-FM1分布孔堵塞 EVAP-C3-FM2除沫器堵塞→蒸汽带液 EVAP-C4-FM1不凝气积聚→传热下降 EVAP-C5-FM1湿蒸汽冲蚀/腐蚀 COMP-C1-FM1结垢转子不平衡 COMP-C1-FM2Blade Fatigue Crack COMP-C1-FM3电机过载/烧毁 COMP-C2-FM1轴承磨损/烧瓦 COMP-C4-FM1可调导叶卡涩/调节失灵 COMP-C5-FM1Shell Corrosion COMP-C6-FM1气封失效内漏 COMP-C6-FM2压缩机喘振 COMP-C7-FM1Cavitation FPH-C1-FM1Impeller Wear FPH-C1-FM3电机过载 FPH-C1-FM4Fouling / Scaling FPH-C2-FM1管束腐蚀 FPH-C2-FM2磨蚀/磨损 FPH-C3-FM1固体堵塞 FPH-C3-FM2Cavitation FPH-C4-FM1测量漂移/导压管堵塞 ICS-C1-FM1传感器失效 ICS-C2-FM1控制逻辑失效/死机 ICS-C3-FM1通信中断 ICS-C3-FM2调节阀卡涩/失效 ICS-C4-FM1变频器故障→压缩机跳闸 ICS-C5-FM1联锁拒动 ICS-C6-FM1联锁误动→非计划停机 ICS-C6-FM2Blade Erosion blade_erosionImpeller Corrosion / Stress Corrosion fmImpeller Fatigue Crack fm_2Impeller Fouling -> Imbalance fm_3Deposit / Fouling -> Efficiency Loss fm_4Corrosion fm_5Corrosion fm_6Erosion fm_7Labyrinth-seal Wear -> Increased Inter-stage Leakage fm_8Honeycomb Seal Blockage fm_9Fatigue fm_10Bending / Bowing fm_11Keyway Crack fm_12Wear fm_13Fretting fm_14Babbitt Wear / Flaking fm_15Oil-film Oscillation (Oil Whip) fm_16High Bearing (Pad) Temperature fm_17Thrust Bearing (Pad) Wear fm_18Excessive Axial Displacement fm_19Seal-face Contamination -> Leak fm_20O-ring Aging oReverse-rotation Damage fm_21Seal-gas Interruption fm_22Filter Blockage fm_23Differential-pressure Transmitter Failure fm_24Booster Pump Failure fm_25Valve-plug Sticking fm_26Actuator Failure fm_27Positioner Failure fm_28Piping Vibration fm_29Cooler Fouling fm_30Lube-oil Pump Failure fm_31Duplex Filter Changeover Failure fm_32Oil Cooler Leak fm_33Oil-tank Water Ingress fm_34Fouling / Scaling fm_35Corrosion fm_36Tube-bundle Leak fm_37Probe Failure fm_38I/O Module (Card) Failure fm_39Loose Wiring / Terminals fm_40Blade Erosion blade_erosionImpeller Corrosion / Stress Corrosion fmImpeller Fatigue Crack fm_2Impeller Fouling -> Imbalance fm_3Deposit / Fouling -> Efficiency Loss fm_4Corrosion fm_5Corrosion fm_6Erosion fm_7Labyrinth-seal Wear -> Increased Inter-stage Leakage fm_8Honeycomb Seal Blockage fm_9Fatigue fm_10Bending / Bowing fm_11Keyway Crack fm_12Wear fm_13Fretting fm_14Babbitt Wear / Flaking fm_15Oil-film Oscillation (Oil Whip) fm_16High Bearing (Pad) Temperature fm_17Thrust Bearing (Pad) Wear fm_18Excessive Axial Displacement fm_19Seal-face Contamination -> Leak fm_20O-ring Aging oReverse-rotation Damage fm_21Seal-gas Interruption fm_22Filter Blockage fm_23Differential-pressure Transmitter Failure fm_24Booster Pump Failure fm_25Valve-plug Sticking fm_26Actuator Failure fm_27Positioner Failure fm_28Piping Vibration fm_29Cooler Fouling fm_30Lube-oil Pump Failure fm_31Duplex Filter Changeover Failure fm_32Oil Cooler Leak fm_33Oil-tank Water Ingress fm_34Fouling / Scaling fm_35Corrosion fm_36Tube-bundle Leak fm_37Probe Failure fm_38I/O Module (Card) Failure fm_39Loose Wiring / Terminals fm_40转子型线磨损 rotor_profile_wear转子接触擦伤 rotor_contact_score_mark滑动轴承缺陷 bearing_journal_defect止推轴承失效 bearing_thrust_failure油系统污染 oil_system_contamination油泵失效 oil_pump_failure中间冷却器结垢 intercooler_fouling吸气过滤器堵塞 suction_filter_clog排气温度过高 discharge_temp_high联轴器不对中 coupling_misalignment振动高（不平衡） vibration_high_unbalance气量调节失灵 capacity_control_malfunction内部增速齿轮失效 internal_gear_fail轴承失效（磨损/剥落） MECH-BEARING-WEAR密封失效 MECH-SEAL-FAILURE结垢/堵塞 MECH-FOULING压缩机喘振 MECH-SURGE润滑失效 MECH-LUBRICATION-FAILURE不对中 MECH-MISALIGNMENT转子不平衡 MECH-UNBALANCE叶轮/叶片磨损 MECH-IMPELLER-WEAR冲蚀/冲刷腐蚀 MECH-EROSION机械疲劳 MECH-MECH-FATIGUE均匀/局部减薄（通用减薄） MECH-THINNING联轴器失效 MECH-COUPLING-FAILURE振动诱发疲劳 MECH-VIB-FATIGUE大气腐蚀 MECH-ATMOS电偶腐蚀 MECH-GALVANIC