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Interior Maintenance Company, Inc.Jon Barrett- Business Development Specialist
Phone: 267-886-7903 Email: [email protected]
Specialists in Industrial and Commercial Cleaning services including Combustible Dust, High Surface,
HVAC Air Duct System, Dust Collector, and Lab Fume Hood System cleaning, serving the United States.
Copyright 2010 Interior Maintenance Company, Inc. www.imc.cc
CSB Combustible Dust Safety Video
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Got Dust?
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Significant accumulation of particulate dust at the ceiling of production facility.
Fresh footprints
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PVC Resin Dust- 2 feet Deep in some Areas!
PVC Resin Dust-several inches thick on Overhead Beams!
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Show Me The Dust!
www.imc.ccSignificant accumulation of dust within an HVAC duct system.
Treat All Dust as if they are Combustible Dust, Unless Tested!
• Have a Sampling of Dust Tested, for Kst Value!
Combustible Dust KST Value Chart
When looking to protect your equipment against a dust explosion, it is critical that you know the
Kst value of your material. Kst, is the dust deflagration index, and it measures the relative
explosion severity compared to other dusts. This is a relative index, however, and any material
with a Kst value greater than zero is considered to be at risk of an explosion. In fact, sugar has a
relatively low Kst value, but was the fuel for for a massive explosion in 2008 that claimed the lives
of 14 workers1.
Examples of Kst Values for Different Types of Dusts2
Dust explosion
class* Kst (bar.m/s)* Characteristic* Typical material**
St 0 0 No explosion Silica
St 1 >0 and ? 200 Weak explosion Powdered milk, charcoal, sulfur, sugar
and zinc
St 2 >200 and ?
300 Strong explosion
Cellulose, wood flour, and poly methyl
acrylate
St 3 >300 Very strong
explosion
Anthraquinone, aluminum, and
magnesium
The actual class is sample specific and will depend on varying characteristics of the material such
as particle size or moisture.
* OSHA CPL 03-00-008 - Combustible Dust National Emphasis Program.
** NFPA 68, Standard on Explosion Prevention by Deflagration Venting.
IMC Technicians Performing High Surface cleaning of Dust
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HEPA Vacuuming Combustible Aluminum/Titanium Dust on Ceiling Beam
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Initial Combustible Dust Hazards
• Manufacturing facilities need to Test/Evaluate Combustible Dust/Particulate, in all areas with the presence of dust. MSDS do not address the Combustible Dust Hazard.
• Most manufacturing facility's Housekeeping or Custodial staff are not typically trained, nor equipped for safe cleaning procedures, proper containment, recycling, and disposal of Combustible Dust/Particulate.
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HEPA Vacuuming Combustible Aluminum/Titanium Dust on Vertical Wall Surface
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Facility Awareness• Combustible Dust must be contained at
the source.
• A simple spark from a Forklift contacting a concrete floor, could set off an explosion.
• Static Electricity may also set off an explosion.
• Electrical systems need to be evaluated.
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IMC Technicians Performing High Surface cleaning of Dust
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Contain The Source!
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Accumulation of dust particulate buildup inside a filter chamber of an HVAC system.
Why 1/32 of an Inch of Dust?• Any amount of Dust accumulation, on any surface
or piece of equipment, acts as an insulator.• This added insulation of dust may cause
manufacturing, electronics and other equipment to heat up and breakdown.
• Added insulation of dust may also cause Electric and Utility costs to increase and may cause Fire Suppression Systems to fail. Is that a high Return On your Investment?
• Insurance Companies require a clean facility and equipment to keep rates down and to ensure decreased liability from hazards.
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Dust Collectors• Dust Collectors- designed to capture dust and
particulate at the source.• So why so much dust?
1) Broken or Leaking seals/gaskets
2) Clogged ductwork/piping
3) Filters and bags are clogged, torn, undersized, or “missing”
4) Not enough CFM pull, from exhaust fans
5) Preventative Maintenance Program/ Housekeeping is non-existent
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Diagram of Dust Collector
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Dust Collectors
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Aluminum Dust in Exhaust System
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HVAC Systems
• HVAC Air Conveyance Systems- designed to filter and deliver conditioned air.
• So why so much dust in HVAC Systems?
1) Dust Collector and other production equipment emitting heavy concentrations of dust and particulate into the air.
2) Clogged ductwork/piping
3) Filters are clogged, undersized, not installed properly, torn or “missing”
4) Not enough CFM pull, from exhaust fans
5) Preventative Maintenance Program/ Housekeeping is non-existent
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Diagram of HVAC System
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HVAC System
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HVAC Rooftop Unit and Ductwork
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Paper Dust in Recycling Center Office Area
Ceiling Tile
Batt Insulation
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Paper Dust-Above Office Space Areas
Ductwork
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Lab Fume Hoods• Lab Fume Hoods- designed to remove carbon,
smoke, particulate, and vapors from lab workspaces.
• Why decreased draw or decreased face velocity?
1) Dust Collector emitting heavy concentrations of dust and particulate into the air2) Clogged Fume Hood, ductwork/piping 3) Filters are clogged, undersized, or “missing” 4) Not enough CFM pull, from exhaust fans5) Preventative Maintenance Program/ Housekeeping is non-existent
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Diagram of Lab Fume Hood
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Lab Fume Hood
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Heat Exchanger• Heat Exchanger and Portable heaters- designed to heat
air in designated work area space.
• Why so much dust on heat exchanger or not enough heat?
1) Dust Collector emitting heavy concentrations of dust and particulate into the air2) Airborne Dust in high concentrations3) Improper installation of Heat Exchanger (too close to ceiling, or another surface4) Preventative Maintenance Program/ Housekeeping is non-existent
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Heat Exchanger
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Health Concerns and Indoor Air Quality, with Any Dust
• Lungs and heart- become congested, decreased blood flow to body. Many types of diseases and disabilities to occur, (Silicosis, Black Lung), short term and long term exposure, increase in Sick Days
• Eyes- unsafe working conditions, may lead to accidents, increase in Sick Days
• Fatigue- workers may decrease productivity, may lead to an accident, increase in Sick Days
• Insurance- Increase in Workmen’s Compensation, Short term and Long term disability, Increase in Liability insurance
• PPE- Increase use of proper PPE, may decrease sick days
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HEPA Vacuuming Combustible Aluminum/Titanium Dust on Horizontal Beam
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Maintenance Issues With Dust
• Lighting is decreased
• More Electric or Power is required, as a result - Utilities are increased
• Decreased safety awareness, lower employee morale
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Combustible Dust Cleaning Per NFPA 654
• Prevent ANY Dust Clouds!
• Do NOT use Compressed Air!
• Do NOT Broom Sweep!
• Use Certified, Tested, HEPA Explosion Proof Vacuums!
• Foam Cleaning can be used, for Certain Dusts/Areas- (But NOT to be used for ANY Metal Dusts!)
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Treat All Dust as if they are Combustible Dust, Unless Tested!
• Have a Sampling of Dust Tested, for Kst Value!
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Clean Up the Dust, and Go Home Safely!
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About IMC
Please contact IMC to provide a free estimate regarding any of your combustible dust
cleaning needs.Jon Barrett can be reached at
(267) 886-7903 or Email: [email protected] is N.F.P.A. and Fire Protection Research
Foundation trained for Explosive DustCleaning, and Chilworth Technology trained for
Dust Explosion Inspection and Cleaning.
Thank you for your time and consideration!
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