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Engineering Controls for Silica. Art Wickman, CIH Georgia Tech Safety & Health Consultation Program. Control Options. 1. Wet Methods 2. Ventilated Tools 3. Abrasive Blasting Controls: Alternate Media Alternate Methods. Engineering Controls: 1. Wet Methods. Water suppression of dust

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engineering controls for silica
Engineering Controls for Silica
  • Art Wickman, CIH
  • Georgia Tech Safety & Health Consultation Program
control options
Control Options
  • 1. Wet Methods
  • 2. Ventilated Tools
  • 3. Abrasive Blasting Controls:
    • Alternate Media
    • Alternate Methods
engineering controls 1 wet methods
Engineering Controls:1. Wet Methods
  • Water suppression of dust
  • Very effective method
  • Requires planning for supply of water and clean up
block cutting dry
Block Cutting: Dry

Monitoring Data:

  • 8 X OSHA PEL
    • Time Weighted Average (TWA)
engineering controls 2 ventilation
Engineering Controls2. Ventilation
  • Portable tools with dust exhaust:
    • Surface Grinders
    • Disc Grinders (tuck pointing)
    • Crack chaser
    • Scarifier
    • Descaler
    • Power chipping tools
  • Retrofit Dust hoods (Dust Muzzle Video)
tuckpointing
Tuckpointing

Note: Fall Protection Required

slide23

Note: Safety Glasses Required

  • Control by Ventilation: Slab Cutting
engineering controls 3 substitute abrasives
Engineering Controls:3. Substitute Abrasives
  • Coal slag (Low silica content, but may contain trace metals including arsenic)
  • Steel grit & steel shot
  • Aluminum oxide
  • Sodium Bicarbonate
    • (baking soda)
  • Dust Suppressed Sand
  • Frozen CO2
  • Ag. Prod. (walnut shells, corn cobs)
substitute abrasives blast and recovery systems
Substitute Abrasives: Blast and Recovery Systems
  • Permits multiple cycles of abrasive
  • Reduces cost of more expensive abrasives
  • Reduces fugitive emissions to Environment
alternate abrasive methods wet blasting
Alternate Abrasive Methods: Wet Blasting

Similar to conventional air blasting

    • Water injected into air/abrasive stream, or
    • Water pressurized with abrasive
  • Work rate <50% of dry abrasive
  • Abrasive consumption <20% of dry
  • Better visibility, lower waste volume
alternate abrasive methods water jetting
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
alternate abrasive methods sponge jet blasting
Alternate Abrasive Methods: Sponge Jet Blasting
  • Dry method, suppressed dust, minimal containment required
  • Light to heavy abrasion
  • Less aggressive cleaning
  • Eliminates the hazards of high pressure blasting