Silica 411 Assessing Silica Risk PowerPoint Presentation, PPT - DocSlides

Silica 411   Assessing Silica Risk PowerPoint Presentation, PPT - DocSlides

2018-11-01 20K 20 0 0

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Rick . Supples. Applied Improvement Technologies. At the end of this . presentation . you will be . able to:. State the difference between silicon, silica, silicates and silicone.. State the difference between crystalline and amorphous forms of silica.. ID: 708660

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Presentations text content in Silica 411 Assessing Silica Risk

Slide1

Silica 411 Assessing Silica Risk

Rick

Supples

Applied Improvement Technologies

Slide2

At the end of this

presentation

you will be able to:State the difference between silicon, silica, silicates and silicone.State the difference between crystalline and amorphous forms of silica.Describe Health RiskRecall legacy exposure event Describe at-risk occupations Describe the OSHA Permissible Exposure Limit and ACGIH TLVDescribe exposure control methodsDescribe silica risks for home DIY projects

Learning Objectives

Learning

Objectives

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1. Differences: Silicon

,

Silica, Silicates and Silicone? Silica Terminology

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Silicon is an element (Si)

Commercially obtained from sand

Combines with O2 forms molecule (SiO2) = silicon dioxide = silicaForms rocks = silicatesSilicon

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What happens to silica in nature?

silica + mineral + time = other silicates

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2. Crystalline vs. Amorphous Silica

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Amorphous silica 

includes glass, flint, opal,

 silica gelCrystalline silica is quartz, also found in pottery, ceramics, bricks, concrete and artificial stoneWhat’s the difference between crystalline and amorphous silica?

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3. Health Risk & Disease

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Quartz is most common form of crystalline silica.

Quartz close cousins -

cristobalite & tridymiteHard to extract anything from earth that is silica-freeAll three forms may become respirable size dusts if work involves chipping, cutting, drilling, or grinding objects that contain crystalline silica.What is the risk from rocks?

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3 dust categories

Inhalable (

 100 µm)Thoracic (  10 µm)Respirable (  4 µm)Are all dust sizes created equal?

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Silicosis (Proliferative Pneumoconiosis)

Lung Cancer

Chronic obstructive pulmonary disease (COPD) Kidney diseaseDisease Types

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Dusty Lung DiseasesProliferativeSilicosis

White lung disease

Black lung diseaseShaver’s diseaseNon-ProliferativeTalcosisStannosisSiderosis

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Debilitating diseaseExposure is common

2 million U.S. workers currently exposed (NIOSH)

Why Recent Compliance Focus?

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4. Legacy Exposure Event

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1930 hydroelectric project

3 mile tunnel was cut through Gauley Mountain – high granite

2,500 workers, drilling through high concentrations of silica rock No PPE Tunnel Rock Composition – commercial value for steel productionTunnel diameter was expanded to offset the cost of the project.

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5. At Risk Occupations

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Construction Jobs: Masonry saws, grinders, drills, jackhammers, chipping tools

O

perating vehicle-mounted drilling rigs; milling; operating crushing machinesOperating heavy equipment for demolitionOSHA estimates 2.3 million U.S. workers potentially exposed to crystalline silica ~90% of those workers employed in the construction industry. Construction

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General Industry

Concrete products, foundries

Hydraulic fracturing for gas and oilDental laboratories Abrasive blasting

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6. Exposure Control Methods

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ESEAP

Hierarchy of Controls

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E

limination

Substitution Engineering Administrative PPE

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Sandblasting

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Substitution to non-silica abrasive critical

Employers find change difficult

Non-silica abrasives are more effective and less costlyExposure Control - Sandblasting

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Aluminum Oxide Glass BeadSteel ShotBaking Soda

Metal Slag

Corn Cob Granules Peach PitsNut ShellsDry IcePlastic MediaSilica SubstitutesMetal Surface Treatment – Deburring - Paint Removal

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7. New Rule Highlights

Small-business employers can use specified dust control methods in lieu of sampling

Must have a written exposure plan (ECP)Must define housekeeping practicesMust offer medical examsMust train workersMust keep records

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Silica Control - Construction Option A

Use Table 1

Tools with ventilation or water systems built-in.Best method for construction takes guesswork outOption BPerformance-oriented option or Scheduled monitoring optionMeasure workers’ exposure to silica, choose dust controls to limit exposures to < PELScheduled sampling =quantitative measurements2 trigger levels - above the permissible exposure limit (PEL) and action level (AL).Use “if/then” guide detailing the sampling schedule Performance Option - it’s complicated!

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Table 1

Specified Exposure Control Methods When Working With Materials Containing Crystalline Silica

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We sampled a demolition job in summerWork crew was dismantling portion of buildingHot ambient summer temperatures

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8. Occupational Exposure Limits

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How is respirable dust measured?

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What’s the Risk for a

DIY’er

Masonry saws, grinders, jackhammers, or handheld chipping tools

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So what about silicone?

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Thanks for coming!

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