OVERVIEW COMBUSTIBLE DUST QUIZ: Management Level

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OVERVIEW COMBUSTIBLE DUST QUIZ Management Level

• Produced under OSHA Susan Harwood Grant
• SH-19509-09

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HAZARD ASSESSMENTS

• What SIZE of dust is Combustible?
• ANSWER What is Dust less than 420 microns in
  size. (passing a 40 sieve).

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HAZARD ASSESSMENTS

• What is the BEST WAY to prevent, Fire Hazards,
  Deflagration, or Explosion?
• ANSWER What is a Self-Assessment, Self-Scoring,
  INSPECTION CHECKLIST?

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HAZARD ASSESSMENTS

• What is the NFPA Code that serves as the GO-NO GO
  DECISION POINT for the Inspection Checklist?
• ANSWER What is NFPA 91 654? IF ONLY
  non-combustible particulate solids are present,
  the checklist does not apply!

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HAZARD ASSESSMENTS

• What are the things OSHA looks for while on a
  Combustible Dust inspection?
• ANSWER What is dust presence and accumulation?
  Dust that is present at greater than 5 of
  surface area, 1/32 of an inch accumulation, and
  accumulation on overhead surfaces will get you
  cited!

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HAZARD ASSESSMENTS

• What is a SECONDARY EXPLOSION?
• ANSWER What is an explosion of dust that gets
  shaken loose from overhead accumulations because
  of the primary explosion?

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PRACTICAL HOUSEKEEPING IGNITION SOURCE CONTROL

• Whats a passive way to prevent dust accumulation
  on walls?
• ANSWER What are OUTWARDLY SLOPING WALLS?
  Theyre designed with a curve away from walls so
  that dust slides off.

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PRACTICAL HOUSEKEEPING IGNITION SOURCE CONTROL

• What are the benefits of FREQUENT dust clean-up?
• ANSWER What is preventing dust accumulation.

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PRACTICAL HOUSEKEEPING IGNITION SOURCE CONTROL

• Name as many sources of mechanical friction that
  can generate heat very quickly?
• ANSWER What are Conveyor Belts, or Metal on
  Metal or failing Bearings?

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PRACTICAL HOUSEKEEPING IGNITION SOURCE CONTROL

• Name as many small and portable IGNITION SOURCES
  as you can remember
• ANSWER What is open flame from matches,
  lighters, space heaters, heat guns, and welding
  equipment?

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PRACTICAL HOUSEKEEPING IGNITION SOURCE CONTROL

• Name as many ELECTRICAL sources of ignition as
  you can you remember
• ANSWER What are exposed electrical wires,
  damaged electrical equipment and wires, static
  electricity, or open breaker panels?

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• What is the National Fire Protection Association?
• ANSWER What is an Association that researches
  and publish standards based on industry
  experience and best practices?

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• Under NFPA, must engineering controls for
  Deflagration prevention be Acceptance Tested?
• ANSWER What is YES

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• Should controls be on a periodic inspection and
  maintenance schedule?
• ANSWER What is YES.

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTIOn

• MUST engineering controls be checked against NFPA
  requirements for Operation, Maintenance, and
  Safety Requirements?
• ANSWER What is YES

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• Name some types of deflagration engineering
  controls or components listed in the NFPA codes
• ANSWER What is 1-Oxidant reduction concentration
  (which prevents combustion), 2-Passive Isolation
  System (isolates system problems),
  Pre-Deflagration detection system ,
  4-Deflagration Suppression and Explosion venting.

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• What is a Deflagration Condition Assessment?
• ANSWER What is analyzing conditions to see if
  you have a potential for a deflagration or dust
  explosion.

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• What MUST you do IF you are a wood processing
  location and youre NOT SURE if you meet NFPA
  Code requirements relating to wood dust hazard
  controls?
• ANSWER What is REVIEW NFPA CODES in detail, and
  DEVELOP A PLAN of ACTION to prevent hazards.

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• Name some NFPA Standards BY NUMBER and purpose...
• ANSWER What is NFPA
• 68 Explosion Protection by Deflagration Venting
• 69 Explosion Prevention Systems
• 70 National Electrical Code
• 77 Recommended Practice on Static Electricity
• 79 Electrical Standard for Industrial Machinery
• 499 Combustible Dusts-Classified
  Locations-Chemical Process Areas
• 654 Prevention of Fire Dust Explosions,
  Handling of Combustible Solids
• 664 Prevention of Fires Explosions in Wood
  Processing and Wood Working Facilities.

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• What are some PRACTICAL WAYS to control
  Deflagrations?
• ANSWER What are ENGINEERED SYSTEMS that ISOLATE,
  REDIRECT, CONTAIN, or EXTINGUISH deflagrations
  within enclosed process equipment?

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NFPA ENGINEERING CONTROLS, BUILDING DESIGN,
EXPLOSION PROTECTION

• What is the MOST CRITICAL component for ANY
  engineered system?
• ANSWER What is OPERATOR TRAINING! Employees who
  control and interpret the information from
  engineering controls MUST know how to properly
  operate the system for start-up, operation,
  shut-down, and ANY other condition!

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DETECTING HAZARDOUS CONDITIONS with THERMOGRAPHIC
IMAGERY

• What is a THERMOGRAPHIC IMAGER?
• ANSWER What is an Infrared Camera. (Remember
  that the detection of infrared radiation is
  converted to visual images with a temperature
  scale. This analytical method allows you to
  detect sources of ignition using visual means).

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DETECTING HAZARDOUS CONDITIONS with THERMOGRAPHIC
IMAGERY

• What is the AUTO-IGNITION temperature of WOOD
  DUST?
• ANSWER What is 399 F to 500 F. (Remember,
  contact with wood dust at this temperature will
  cause it to ignite)!

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DETECTING HAZARDOUS CONDITIONS with THERMOGRAPHIC
IMAGERY

• What is the surface temperature range of a Metal
  Halide Lamp?
• ANSWER What is 400 F to 700 F. Also, failure
  of this type of light source is catastrophic,
  it can shatter and explode.

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DETECTING HAZARDOUS CONDITIONS with THERMOGRAPHIC
IMAGERY

• A Halogen lamp is uncovered and wood dust is
  suspended in air. Using TI, the lamps surface
  temperature was determined to be at 552 degrees
  Fahrenheit Is this ABOVE or BELOW the
  auto-ignition temperature of wood dust?
• ANSWER What is ABOVE it? The auto-ignition
  temperature for wood dust is 399 to 500 degrees
  Fahrenheit, and this is an IGNITION SOURCE. With
  dust suspended in air, DEFLAGRATION CONDITIONS
  exist.

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DETECTING HAZARDOUS CONDITIONS with THERMOGRAPHIC
IMAGERY

• Wood dust has accumulated next to an electrical
  panel, and a Thermographic Image of the panel
  shows a surface temperature of 700 degrees
  Fahrenheit. Is it a cause for concern?
• ANSWER What is YES! In this case, the surface
  temperature alone is enough to auto-ignite the
  dust! You have FIRE TRIANGLE conditions at this
  point, and will have a deflagration hazard if
  dust becomes suspended in air.