COMBUSTIBLE METAL POWDER — ZIRCONIUM EXPLOSION — 3 FATALITIES
AL Solutions Zirconium Powder Explosion
AL Solutions, Inc.
📍 New Cumberland, WV
Incident: December 9, 2010  •  CSB Report: March 2014
3
Fatalities
Zirconium Metal Powder (Combustible Metal Dust — Highly Reactive — Dryer Explosion)
Chemical Involved
10
CSB Recommendations
📋 Incident Summary

On December 9, 2010, an explosion and fire at AL Solutions in New Cumberland, West Virginia, killed three workers and injured one. AL Solutions manufactured zirconium metal powder — a highly reactive combustible metal — used in various industrial and specialty applications.

The explosion occurred in the dryer area where zirconium powder was being dried after wet processing. Zirconium is a highly reactive metal that ignites spontaneously when exposed to air in finely divided form. When the dried zirconium dust exploded, the intense metal fire that followed was self-sustaining and not suppressible with water.

The CSB found that AL Solutions did not have adequate process hazard analysis or operating procedures for the unique hazards of zirconium metal powder. The company was using a production process for zirconium that was not specifically designed or analyzed for the management of highly reactive metal powder fires and explosions.

🔎 Key Findings
Finding 01
Zirconium Metal Powder Ignited in Dryer — Explosion and Intense Metal Fire
Zirconium powder ignited in the dryer area during the drying step of wet processing. Zirconium in finely divided form is highly pyrophoric — it ignites spontaneously in air and burns with an extremely intense, self-sustaining fire.
Finding 02
No Adequate Process Hazard Analysis for Zirconium Powder Operations
AL Solutions had not conducted an adequate process hazard analysis for the pyrophoric and reactive hazards of zirconium metal powder. The unique hazards of this combustible metal were not systematically evaluated.
Finding 03
Zirconium Powder Fires Cannot Be Extinguished with Water
Zirconium metal fires are Class D fires — they cannot be suppressed with water, foam, CO₂, or other standard fire suppressants. Water reacts with burning zirconium and can intensify the fire. This hazard was not adequately communicated to workers.
Finding 04
Dryer Design and Operating Procedures Not Specific to Highly Reactive Metal Powders
The drying equipment and operating procedures for zirconium powder at AL Solutions were not specifically designed and analyzed for the management of highly reactive, pyrophoric metal powders.
Finding 05
Three Workers Killed — Only One Survived
Three of the four workers in or near the dryer area were killed. The intensity of a zirconium metal fire — temperatures exceeding 3,000°C — makes survival extremely unlikely for anyone in the immediate area of ignition.
🔍 Root Causes
1
Pyrophoric Hazard of Zirconium Metal Powder Not Adequately Addressed in PHA or PSI
The fundamental cause of the AL Solutions explosion was the failure to identify and address the pyrophoric and reactive properties of zirconium metal powder in process hazard analysis and process safety information for the production operation.
2
Dryer Operation Created Conditions for Pyrophoric Dust Ignition
The drying step created conditions — finely divided, dried metal powder exposed to air — that maximized the ignition potential of pyrophoric zirconium. Without understanding of the pyrophoric hazard, there were no controls to prevent ignition during this step.
3
Workers Not Trained on Zirconium-Specific Hazards — Especially Fire Response
Workers and emergency responders were not adequately trained on the specific hazards of zirconium metal — particularly the pyrophoric nature of the powder and the Class D fire response requirements. Standard fire response would be ineffective and potentially dangerous.
☑ CSB Recommendations
→ AL Solutions / Reactive Metal Powder Manufacturers
Conduct a comprehensive PHA specifically addressing the pyrophoric and reactive hazards of zirconium and other reactive metal powders; design process equipment and operating procedures specifically for reactive metal powder service; provide Class D fire emergency response training and equipment.
→ Combustible Dust Industry
Recognize combustible metal powders — zirconium, titanium, magnesium, aluminum — as a separate hazard category from organic dusts; implement hazard management approaches specific to pyrophoric metal dust, not adapted from grain dust or organic dust practices.
→ OSHA
Develop combustible metal powder-specific process safety guidance; address the pyrophoric hazard of reactive metal powders in any comprehensive combustible dust standard; require Class D fire response capability at facilities manufacturing or processing reactive metal powders.
→ NFPA
Update NFPA standards for combustible metals to specifically address the full production process hazards of pyrophoric reactive metal powder manufacturing, including drying, handling, and storage operations.
💡 Lessons Learned
Zirconium, titanium, magnesium, and aluminum metal powders are not simply "combustible dusts" — they are pyrophoric materials that ignite spontaneously in air in finely divided form, burn at temperatures exceeding 3,000°C, and cannot be extinguished with conventional fire suppression. Treating these materials as combustible dusts managed by standard dust explosion practices dramatically underestimates the hazard and will fail catastrophically when the material ignites.
The drying step is the critical hazard point in reactive metal powder production. Wet metal processing creates a relatively controlled environment — wet metal powder is much less reactive than dry. The transition to dry powder, in a dryer that introduces heat and air, creates the maximum pyrophoric ignition potential. The drying process must be specifically designed and analyzed for the ignition potential of the specific reactive metal being processed.
Emergency response to a reactive metal (Class D) fire requires specific equipment and trained personnel. Standard fire extinguishers, water, CO₂, and foam are either ineffective or actively dangerous for Class D fires. Facilities processing reactive metal powders must have Class D fire suppression materials, specifically trained responders, and clear evacuation-first emergency response protocols when a reactive metal fire ignites — because containing a zirconium fire is often not possible.
The process hazard analysis for reactive metal powder manufacturing must be conducted by — or in consultation with — personnel with specific expertise in reactive metal hazards. Conventional HAZOP facilitators and process engineers may not have the pyrotechnic chemistry knowledge needed to identify the ignition and fire hazards of specific reactive metals. External expertise in reactive metal powder hazards should be a standard component of PHA for these materials.
PSI: Process Safety InformationPHA: Process Hazard AnalysisSOP: Operating ProceduresTRN: Training
🔨 Safety Meeting Toolbox Talk
►Does your facility manufacture, process, or handle reactive metal powders — zirconium, titanium, magnesium, aluminum — or other pyrophoric materials? If so, has a PHA been conducted by personnel with specific expertise in reactive metal powder hazards?
►Are all workers and emergency responders who could encounter a reactive metal fire trained on Class D fire response requirements? Do they have access to appropriate Class D suppression materials (dry sand, Met-L-X, etc.)?
►Has the drying step for any reactive metal powder process at your facility been specifically analyzed for pyrophoric ignition potential? Are dryer design and operating parameters specifically set to minimize ignition risk?
►Does your PSI for reactive metal powder processes document the pyrophoric and Class D fire hazards of each metal powder — with specific guidance on what NOT to do in a fire (water, CO₂, standard extinguishers)?
Immediate Action Items
✓If your facility processes reactive metal powders, conduct a PHA specifically addressing pyrophoric ignition hazards; engage personnel with specific expertise in reactive metal chemistry.
✓Inventory all fire suppression equipment accessible in reactive metal powder processing areas; replace or supplement standard extinguishers with Class D suppression materials where required.
✓Provide specific training on reactive metal fire hazards and Class D fire response to all workers in reactive metal powder production and storage areas.
✓Review operating procedures for drying and handling of reactive metal powders; ensure procedures address ignition control, atmospheric monitoring, and emergency response specific to pyrophoric material.
🔗 PSM Failures Behind This Incident

This incident traced to breakdowns across 4 PSM elements (PSI · PHA · SOP · TRN). Each represents a documented gap that process safety documentation and consulting can close before a similar event occurs at your facility.

Process Safety Information (PSI)
Accurate, complete Process Safety Information is the foundation every other PSM element depends on. When PSI is missing or wrong — chemistry data, equipment specs, P&IDs — the entire hazard analysis is built on a flawed base.
Supporting documents in our library →
Process Hazard Analysis (PHA)
A structured PHA or HAZOP study exists to identify exactly these scenarios before they occur. When PHA is absent, superficial, or overdue for revalidation, hazards operate unseen until they kill someone.
Supporting documents in our library →
Operating Procedures (SOPs)
Operators cannot reliably hold safe operating limits without clear, current, enforced procedures. Deviation from acceptable operating conditions — a root cause here — is a direct consequence of SOP failure.
Supporting documents in our library →
Training & Operator Competency
Workers must understand process hazards — not just the steps on the page. Training records, refresher frequency, and verified competency are all OSHA PSM requirements that gaps here violated.
Supporting documents in our library →
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