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John Astad

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
      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
  • he hazard increases as the aluminum particle size decreases.
    • John Astad
      John Astad on 24 Jun 09
       
      Ignition sensitivity decreases and explosion severity increases. An interesting inverse relationship
  • Explosions of aluminum dusts have occurred in industry.
    • John Astad
      John Astad on 24 Jun 09
       
      Very destructive explosions. T
  • ...7 more annotations...
  • MAXIMUM RATE OF PRESSURE RISE:
    • John Astad
      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.
  • MAXIMUM EXPLOSION PRESSURE
    • John Astad
      John Astad on 24 Jun 09
       
      Explosive Severity (Kst) increases as the Al dust size decreases.
  • MINIMUM CLOUD IGNITION ENERGY:
    • John Astad
      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
  • Use an explosion-proof vacuum equipped with high efficiency filter(s).
    • John Astad
      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.
  • Material Safety Data Sheet.
    • John Astad
      John Astad on 24 Jun 09
       
      The majority of MSDS's do not have the important ignition sensitivity and expslosion severity data. Does yours?
  • may also be required.
    • John Astad
      John Astad on 24 Jun 09
       
      Should always be requred. Are personnel wearing Flame Resistant Clothing (FRC's) at all times?
  • Provide dust collectors with explosion vents
    • John Astad
      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.
  • 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.
John Astad

School inspections reveal unsafe combustible dust hazards | Expatica The Netherlands - 0 views

www.expatica.com/...l-unsafe-conditions_53902.html

combustible dust hazards Schools Vocational Training

shared by John Astad on 24 Jun 09 - Cached
  • Inspections revealed that metal, wood, and auto workshops are particularly unsafe.
    • John Astad
      John Astad on 24 Jun 09
       
      Several combustible dust related fires at schools last year here in the USA also
  • Inspections also revealed that vocational schools are largely ignorant of the risk of wood dust explosions.
    • John Astad
      John Astad on 24 Jun 09
       
      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.
  • According to de Groot, a funding shortage caused the dangerous situations in these schools.
    • John Astad
      John Astad on 24 Jun 09
       
      Funding is a big issue with the initial combustible dust testing for ignition sensitivity and explosion severity.
  • John Astad on 24 Jun 09
     
    Just as in the Netherlands, combustible dust hazards exist in schools here in the USA that have vocational training in their metal, wood, and auto workshops
John Astad

OSHA letter to 30,000 facilities with combustible dust hazards -FOIA Page - 0 views

www.osha.gov/...combustible-dust-letter.html

OSHA Dust NEP

shared by John Astad on 21 Jun 09 - Cached
  • Combustible dusts are often either organic or metal dusts that are finely ground into very small particles, fibers, fines, chips, chunks, flakes,
    • John Astad
      John Astad on 21 Jun 09
       
      Don't forget hybrid mixtures, where flammable vapors mixed with combustible dust, decrease the ignition sensitivity and increase explosion severity of the explosion hazard.
  • Your establishment has been identified as being in an industry
    • John Astad
      John Astad on 21 Jun 09
       
      What about the thousands of other facilities that were not identified in the OSHA Dust NEP? All facilities that generate combustible dust in the manufacturing process are at risk. If your facility has not been identified in Appendix D-1 and D-2 of national industries (NAICS) in the Dust NEP, you are still at risk.
  • Failure to attend to housekeeping standards or to conduct maintenance on your ventilation systems or electrical controls places your employees and your facility at risk.
    • John Astad
      John Astad on 21 Jun 09
       
      Also failure to implement best engineering practices as outlined in the NFPA combustible dust standards. Housekeeping alone will not mininmize the severity and probability of occurence.
  • John Astad on 21 Jun 09
     
    Came across this letter that was sent out to over 30,000 facilities last year by OSHA and thought I'd share with you in case you haven't seen it. There are over 100,000 facilities at risk, which includes many national industries not listed in the Dust NEP. For example, over 50% of ComDust incidents,from media accounts, last year occurred in national industries (NAICS) not referenced in the Dust NEP
John Astad

Vose Software - Risk software specialists - 0 views

www.vosesoftware.com

risk_analysis process_hazard_analysi

shared by John Astad on 16 Jun 09 - Cached
  • John Astad on 16 Jun 09
     
    Maybe another another tool for seeking the probability of occurence and severity of the next combustible dust related fire/explosion during the process hazard analysis?
John Astad

Facility Combustible Dust Evaluation with CTI - 0 views

www.conversiontechnology.com/fcde.html

hazard_evaluations explosion_severity Combustible_Dust_Safety_Program

shared by John Astad on 15 Jun 09 - Cached
  • John Astad on 15 Jun 09
     
    CTI can develop a facility-specific Combustible Dust Safety Program that will be an all-inclusive safety plan addressing combustible dust hazards
  • John Astad on 15 Jun 09
     
    CTI is available to conduct a hazard analysis at the facility to determine the location and severity of combustible dust hazards at a facility. CTI can also assist with developing combustible dust policies, safety programs, aid in training and implementation of the program, and perform engineering design and selection of explosion prevention and protection equipment.
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