SPOByproduct treatment unit reactor phosgene release (valve mispositioned + overpressure)
Incorrect valve position + inadequate phosgene system isolation + insufficient training
The recorded code SPO 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.
fatigue_fractureBending bendingKeyway Wear keyway_wearCorrosion/Erosion corrosion_erosionBlade Crack blade_crackBlade Detachment blade_detachmentGlass-lining Damage glass_lining_damageGear Wear/Pitting gear_wear_pittingBearing Failure bearing_failureOil Seal Leak oil_seal_leakInternal Corrosion Thinning internal_corrosion_thinningStress Corrosion Cracking (SCC) sccWeld Crack weld_crackGlass-lining Failure glass_lining_failureCorrosion corrosionAnchor Bolt Loosening anchor_bolt_looseningFace Wear face_wearO-ring Aging o_ring_agingSpring Failure spring_failureSecondary Seal Leak secondary_seal_leakDry-running Burn dry_running_burnFlush Loss flush_lossFilter Clogging filter_cloggingGasket Aging gasket_agingFlange Face Corrosion flange_face_corrosionJacket Corrosion jacket_corrosionJacket Fouling jacket_foulingHalf-pipe Weld Leak half_pipe_weld_leakCoil Perforation coil_perforationVibration Fatigue vibration_fatigueSupport Loosening support_looseningSet Point Drift set_point_driftValve Seat Leakage seat_leakagePremature Fatigue Rupture premature_ruptureBackside Corrosion backside_corrosionRelief Line Blockage vent_line_blockageQuench System Failure quench_system_failureSensor Drift sensor_driftThermowell Corrosion thermowell_corrosionDiaphragm Failure diaphragm_failureImpulse Line Blockage impulse_line_blockageImpulse Line Blockage impulse_line_blockage_2Coating→False Reading coating_false_readingElectrode Fouling electrode_foulingCalibration Drift calibration_drift