John Astad's List: Combustible Dust Training

•   Combustible Dust Free Safety Training: Preventing and Mitigating Combustible Dust Fires and Explosions

• In 2008, media reports indicated   200+ combustible dust related fires and explosions in the grain,   manufacturing, utility, and non-manufacturing sectors in the United   States.

  • I think I've read this somewhere before? Over 200+ incidents
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• Staubexplosion in einem Schreinereibetrieb

  • Dust explosion in a carpentry operation
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• Zum Glück handelte es sich nur um eine Übung am Dienstag,

  • "Fortunately it was just an exercise on Tuesday" This is a great idea with fire department conducting fire drills at manufacturing facilities that generate combustible dust
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• „Durchzündung

  • Flash Overs (Durchzündung)
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• Spänebunker als Sammelbecken für die Absauganlage.

  • "Chip Bunker as reservoirs for the exhaust." One area where the combustible dust explosion hazard exists
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• Während der gesamten Übung wurde zudem erstmals das Verhalten der Feuerwehrleute digital festgehalten, sodass bei der anschließenden Manöverkritik im Gerätehaus die Bilder eine wertvolle Hilfe bei der Bewertung der Übung waren.

  • "Throughout the exercise was also the first time the behavior of the firefighters digitally recorded, so when the subsequent maneuvers Tool criticism in the pictures is a valuable aid in the evaluation of the exercise were."
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• What is the American Conference of Governmental Industrial Hygienists (ACGIH) recommended exposure limit for aluminum powder (uncoated)

  • I'd like to thank Tracey Kelly, Safety Consultant in Ireland for sharing this so others in the ComDust network can gain an added awareness on the hazards of Al dust
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• he hazard increases as the aluminum particle size decreases.

  • Ignition sensitivity decreases and explosion severity increases. An interesting inverse relationship
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• Explosions of aluminum dusts have occurred in industry.

  • Very destructive explosions. T
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• MINIMUM CLOUD IGNITION ENERGY:

  • Notice how the minimum ignition energy (MIE) required for ignition decreases as the AL dust size decreases. Static electricty (ESD) hazard here
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• MAXIMUM EXPLOSION PRESSURE

  • Explosive Severity (Kst) increases as the Al dust size decreases.
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• MAXIMUM RATE OF PRESSURE RISE:

  • It's interesting to note that the resueable Solid Rocket Boosters (SRB) of the Space Shuttle utilize over 300,000 pounds of aluminum dust to launch the vehicle into space.
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• Use an explosion-proof vacuum equipped with high efficiency filter(s).

  • Note explosion proof vacumns only for use in Hazardous (Classified) Locations Class ll . NFPA 70 Article 500 is an excellent follow-up resource.
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• Material Safety Data Sheet.

  • The majority of MSDS's do not have the important ignition sensitivity and expslosion severity data. Does yours?
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• may also be required.

  • Should always be requred. Are personnel wearing Flame Resistant Clothing (FRC's) at all times?
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• Provide dust collectors with explosion vents

  • Enesure that the explosion vents are directed in a safe restrocted area, away from loading docks, walkways, parking lots, etc. The volumetric expansion of a fireball exiting an explosion vent is 10:1.
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• Inspections revealed that metal, wood, and auto workshops are particularly unsafe.

  • Several combustible dust related fires at schools last year here in the USA also
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• Inspections also revealed that vocational schools are largely ignorant of the risk of wood dust explosions.

  • Same situation in the USA. Combustible dust hazards is a global issue of concern throughout many sectors that a majority of stakeholders are not aware of.
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• According to de Groot, a funding shortage caused the dangerous situations in these schools.

  • Funding is a big issue with the initial combustible dust testing for ignition sensitivity and explosion severity.
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