Engineering Controls for Silica Art Wickman, CIH Georgia Tech Safety & Health Consultation Program.
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Transcript of Engineering Controls for Silica Art Wickman, CIH Georgia Tech Safety & Health Consultation Program.
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Engineering Controls for Silica
Art Wickman, CIH
Georgia Tech Safety & Health Consultation Program
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Control Options
1. Wet Methods
2. Ventilated Tools
3. Abrasive Blasting Controls:Alternate MediaAlternate Methods
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Engineering Controls:1. Wet Methods
Water suppression of dust
Very effective method
Requires planning for supply of water and clean up
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Note: Safety Glasses Required
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Wet Methods: Portable Saw
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Block Cutting: Dry
Monitoring Data:
8 X OSHA PEL Time Weighted
Average (TWA)
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Block Cutting--Dry
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Wet Methods: Block Cutting
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Wet Methods: Requires Pre-planning
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Wet Methods: Joint Cutting
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Wet Methods: Jack hammer, chipping
hammer, etc.
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Double click photo for demo
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Wet Methods: Spray Systems for Bulk Materials
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Engineering Controls2. Ventilation
Portable tools with dust exhaust:Surface GrindersDisc Grinders (tuck pointing)Crack chaserScarifierDescalerPower chipping tools
Retrofit Dust hoods (Dust Muzzle Video)
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Tuckpointing
Note: Fall Protection Required
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Control by Ventilation: Tuckpointing
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Control by Ventilation: Tuckpointing
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Control by Ventilation: Slab Cutting
Note: Safety Glasses Required
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Control by Ventilation: Hand tools
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3. Abrasive Blasting
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Engineering Controls: 3. Substitute AbrasivesCoal slag (Low silica content, but may contain trace metals including arsenic)Steel grit & steel shotAluminum oxideSodium Bicarbonate (baking soda)
Dust Suppressed SandFrozen CO2 Ag. Prod. (walnut shells, corn cobs)
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Substitute Abrasives: Blast and Recovery Systems
Permits multiple cycles of abrasive
Reduces cost of more expensive abrasives
Reduces fugitive emissions to Environment
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Alternate Abrasive Methods: Wet Blasting
Similar to conventional air blastingWater injected into air/abrasive stream, orWater pressurized with abrasive
Work rate <50% of dry abrasive
Abrasive consumption <20% of dry
Better visibility, lower waste volume
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Alternative Blast Method: Enclosure
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Alternate Abrasive Methods: Water Jetting
1. High Pressure 10,000 – 25,000 psi Removes most paint, rust, mill scale, chemical
contaminants
2. Ultra High Pressure >25,000 psi Removes all coatings
Processes can use vacuum shroud to retain/recycle water
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Alternate Abrasive Methods:
Sponge Jet Blasting
Dry method, suppressed dust, minimal containment required
Light to heavy abrasionLess aggressive cleaning
Eliminates the hazards of high pressure blasting