georgia tech safety and health consultation program1 silicosis prevention introduction to osha’s...
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Silicosis PreventionSilicosis Prevention
Introduction to OSHA’s Special Emphasis Program
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SilicaSilicaSpecial Emphasis ProgramSpecial Emphasis Program
Began in 1997 Part of OSHA current Strategic Plan
(through 2008) Compliance Enforcement Consultation Training and Outreach – OSHA Web-site
Standard Development and Stakeholders Meetings Currently in Progress
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Why Target Crystalline Silica Why Target Crystalline Silica Exposure?Exposure?
1. Toxicity is well documented
2. Widespread worker overexposure
3. Exposures can be controlled
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Case Study, 1930’s: Hawk’s Case Study, 1930’s: Hawk’s Nest TunnelNest Tunnel
Gauley Mt., W. VA.
1930 – 1935
Estimated Deaths from Silicosis:– 500 to 750
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Progress made: Exposures Progress made: Exposures in the 21in the 21stst Century Century
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What is Silica?What is Silica?
Composes 15% of Earth’s Crust 1. Crystalline Silica (regulated)– has a diagnostic X-ray diffraction
pattern 2. Amorphous Silica (not regulated)– “without form”– cannot distinguish by X-ray diffraction– Glass is common example
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Crystalline SilicaCrystalline Silica
Examples:– Sand, Granite, other “Hard” rocks
Quartz, most common
Cristobalite, Tridymite Much less common, but more toxic than
quartz
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Potential Silica Potential Silica ExposuresExposures
Foundries
Ceramics Industry
Abrasive Blasting
Construction
Manufacturing of cleaning agents
Mining Operations
Use of Coal (e.g., electric power generation)
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Silica and MortalitySilica and Mortality
250 Worker deaths per year from Silica– (Compare to 175 deaths/yr from trenching accidents)
Silicosis Tuberculosis Heart Disease
Lung Cancer?– Suspect Hum. Carcinogen –A2 (ACGIH)
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Health EffectsHealth Effects
Chronic-Obstructive Pulmonary (Lung) Disease--COPD
Affects Aveolar Surface–Decreases Elasticity
–Prevents Oxygen/CO2 Exchange
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Silicosis DiagnosisSilicosis Diagnosis
Requires Chest X-ray
X-ray must be read by qualified “B-Reader”
Silica Nodules are Non-Reversible
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Disease Classes of SilicosisDisease Classes of Silicosis
1. Acute Silicosis (Highest Exp.)– Latency of weeks to 5 years
2. Accelerated Silicosis (High Exp.)– Latency of 5 to 15 years
3. Chronic Silicosis (Moderate Exp.)– Latency >15 years
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Silicosis: Silicosis: Non-CurableNon-Curable Disease Disease
Prevention through Safe Workpractice is critical
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Silicosis Prevention ProgramSilicosis Prevention Program
Engineering Control of Dust
Training on crystalline silica
Respiratory protection program
Work clothes, change and wash area
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Silicosis Prevention ProgramSilicosis Prevention Program
Air monitoring program
Medical surveillance
Housekeeping and Regulated Areas
Recordkeeping
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