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OSH Answers: 4-Working Safely with Aluminum Powder dust explosion hazards - 0 views

www.ccohs.ca/...working_alu.html

Aluminum dust explosion severity ignition sensitivity Canadian Centre for Occupational Health and Safety CCOHS)

shared by John Astad on 24 Jun 09 - Cached

What is the American Conference of Governmental Industrial Hygienists (ACGIH) recommended exposure limit for aluminum powder (uncoated)
- John Astad on 24 Jun 09
  
  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
  
  <div class="cArrow"> </div><div class="cContentInner">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</div>
  
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he hazard increases as the aluminum particle size decreases.
- John Astad on 24 Jun 09
  
  Ignition sensitivity decreases and explosion severity increases. An interesting inverse relationship
  
  <div class="cArrow"> </div><div class="cContentInner">Ignition sensitivity decreases and explosion severity increases. An interesting inverse relationship</div>
  
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Explosions of aluminum dusts have occurred in industry.
- John Astad on 24 Jun 09
  
  Very destructive explosions. T
  
  <div class="cArrow"> </div><div class="cContentInner">Very destructive explosions. T</div>
  
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...7 more annotations...
MAXIMUM RATE OF PRESSURE RISE:
- John Astad on 24 Jun 09
  
  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.
  
  <div class="cArrow"> </div><div class="cContentInner">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.</div>
  
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MAXIMUM EXPLOSION PRESSURE
- John Astad on 24 Jun 09
  
  Explosive Severity (Kst) increases as the Al dust size decreases.
  
  <div class="cArrow"> </div><div class="cContentInner">Explosive Severity (Kst) increases as the Al dust size decreases.</div>
  
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MINIMUM CLOUD IGNITION ENERGY:
- John Astad on 24 Jun 09
  
  Notice how the minimum ignition energy (MIE) required for ignition decreases as the AL dust size decreases. Static electricty (ESD) hazard here
  
  <div class="cArrow"> </div><div class="cContentInner">Notice how the minimum ignition energy (MIE) required for ignition decreases as the AL dust size decreases. Static electricty (ESD) hazard here</div>
  
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Use an explosion-proof vacuum equipped with high efficiency filter(s).
- John Astad on 24 Jun 09
  
  Note explosion proof vacumns only for use in Hazardous (Classified) Locations Class ll . NFPA 70 Article 500 is an excellent follow-up resource.
  
  <div class="cArrow"> </div><div class="cContentInner">Note explosion proof vacumns only for use in Hazardous (Classified) Locations Class ll . NFPA 70 Article 500 is an excellent follow-up resource.</div>
  
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Material Safety Data Sheet.
- John Astad on 24 Jun 09
  
  The majority of MSDS's do not have the important ignition sensitivity and expslosion severity data. Does yours?
  
  <div class="cArrow"> </div><div class="cContentInner">The majority of MSDS's do not have the important ignition sensitivity and expslosion severity data. Does yours?</div>
  
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may also be required.
- John Astad on 24 Jun 09
  
  Should always be requred. Are personnel wearing Flame Resistant Clothing (FRC's) at all times?
  
  <div class="cArrow"> </div><div class="cContentInner">Should always be requred. Are personnel wearing Flame Resistant Clothing (FRC's) at all times?</div>
  
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Provide dust collectors with explosion vents
- John Astad on 24 Jun 09
  
  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.
  
  <div class="cArrow"> </div><div class="cContentInner">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.</div>
  
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John Astad on 24 Jun 09

Very informative article that also provides generic data on explosion severity and ignition sensitivity of Aluminum dust. Was a bit troubled when mention that, "administrative controls and personal protective equipment may also be required." These type of controls should always be required instead of maybe.

<div class="cArrow"> </div><div class="cContentInner">Very informative article that also provides generic data on explosion severity and ignition sensitivity of Aluminum dust. Was a bit troubled when mention that, "administrative controls and personal protective equipment may also be required." These type of controls should always be required instead of maybe.</div>

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OSH Answers: 4-Working Safely with Aluminum Powder dust explosion hazards - 0 views

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