Accident Lesson Card · Universal Form Clamp Open-Tank Flammable Vapor Cloud Explosion (Bellwood)

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CSB Investigation Report No. 2006-08-I-IL 2006 Safety Safety

Universal Form Clamp Open-Tank Flammable Vapor Cloud Explosion (Bellwood)

Universal Form Clamp Co., Bellwood, Illinois

1Fatalities

5Injuries

ExplosionMechanism code ELP

⌗Failure Mode · ISO 14224 Mapping

Damage mechanism (recorded in KB)

ExplosionELP

ISO functional code (as recorded)

ISO 14224:2016 functional failure code

ELP · External leakage - process

ISO ELP — External leakage - process.

1What Happened

Open-top tank: mixing/heating flammable liquid generated vapor cloud, ignited

2Root Cause

Mixing/heating flammable liquid in open-top tank without adequate safety controls; vapor cloud ignited — 1 killed, 5 injured

3Reliability Lessons (from investigation root cause)

The 'Root Cause' above is the core lesson of this accident; not split further.

4Associated Failure Mechanisms (Keywords)

storage tank open top tank flammable liquid vapor cloud ignition explosion mixing heating

About the Failure-Mode Code (click to expand)

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.

5Evidence Source (transparent)

Authority：U.S. Chemical Safety and Hazard Investigation Board (CSB)
Official Report：www.csb.gov ↗
Data Verification：verified_url_csb_sitemap

↗Related Failure Modes · Traceability

Bottom Plate Perforation bottom_plate_perforationBottom Weld Crack bottom_weld_crackUnder-deposit Corrosion under_deposit_corrosionShell Thinning shell_thinningWeld Crack weld_crackCorrosion Under Insulation (CUI) cuiRoof Corrosion roof_corrosionFloating Roof Sticking floating_roof_stickingSeal Leak -> VOC Emission seal_leakDifferential Settlement differential_settlementConcrete Crack concrete_crackPad Failure pad_failureFreezing/Sticking freezing_stickingSeat Corrosion seat_corrosionElement Plugging element_pluggingElement Corrosion element_corrosionN2 Supply Loss n2_supply_lossControl Valve Failure control_valve_failureAntenna Fouling antenna_foulingElectronics Failure electronics_failureWire Sticking wire_stickingDisplacer Perforation displacer_perforationContact Corrosion contact_corrosionFloat Sticking float_sticking

Report No. 2006-08-I-IL · Data from CSB public investigation conclusions, compiled by Reliability AI, for reliability demonstration purposes only. This case is derived from public incident investigation reports for learning purposes only. AIM does not endorse or guarantee its accuracy.