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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




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


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