Presentation on theme: "Bryan Seal, CIH, CSP Steve Delp, CAS"— Presentation transcript:
1Bryan Seal, CIH, CSP Steve Delp, CAS Crystalline SilicaBryan Seal, CIH, CSPSteve Delp, CAS
2What is it? Silica is an oxide of Silicon (metal) Specifically it is Silicon dioxideIt’s structure is crystallineVery hardQuartzPlain old sand
3Where do you find silica? Foundries that use sand in mold and core-making processesSteel and other metal processing – used in some refractoriesCoal miningQuarries and cement millsOil and gas well fracking operationsConstruction – concrete cutting, demolition, removing old pointing
4How are you exposed to silica? Silica must be inhaled to be toxicDust particles must be small enough to enter the lungs – Respirable (<10 microns)Any operations that create dust – falling sand, dry sweeping, cutting, grinding, blowing, shaking, dropping, chopping, shoveling and any other task that creates dust.
5Health Effects - Silicosis These small sharp crystalline particles collect in the lungs and over time continuously cut and irritate the lung tissue.This causes scarring which decreases the oxygen transfer capability of the lung.It also decreases the elasticity of the lungs which decreases flow of air into and out of lungs
7Health Effects - Silicosis Silicosis is progressive and can be fatal – 15 – 20 YearsSilica exposure has also been linked to lung cancerAccelerated Silicosis – 5-10 YearsAcute Silicosis – A Few Months200 Deaths Per Year
8What must employers do? Know that there is silica in the workplace Know what the silica exposure levels areProvide training to employeesControl or eliminate silica exposures through engineering controlsProvide PPE
9How workers can help? Recognize that silica may be present Adopt work practices that minimize exposureWear PPE
10What Is OSHA Doing? Standards (Prerule – OMB Fall 2009) General Industry, Ventilation, Air contaminantsTable Z-1, Limits for air contaminantsTable Z-3, Mineral dusts Silica PEL mg/M3 - RespirableConstruction Industry, Air contaminantsVentilation
11Guidance – General Industry "Crystalline Silica Exposure" Health Hazard Information for General Industry Employees. OSHA Publication 3176, (2002). Discusses what silica is, what are its hazards, and what employers and employees can do to protect against exposures to silica.Crystalline Silica Exposure Health Hazard Information OSHA Fact Sheet, (2002) Provides information regarding silicosis disease and exposures.Crystalline Silica Exposure in General Industry. OSHA Health Hazard Information Card. Provides health hazard information and good work practices for workers.
12Guidance – Construction Industry Crystalline Silica Exposure Card for Construction. OSHA, (2002). Discusses what silica is, what are its hazards, and what employers and employees can do to protect against exposures to silica.Crystalline Silica Exposure in the Construction Industry. OSHA."Crystalline Silica Exposure" Health Hazard Information for Construction Employees. OSHA Publication 3177, (2002). Discusses what silica is, what are its hazards, and what employers and employees can do to protect against exposures to silica.Crystalline Silica Exposures in Construction. OSHA (Ellen I. Roznowski), (1997, July). Includes case studies and OSHA enforcement data.Controlling Silica Exposures in Construction OSHA Publication , (2009). Provides information on the effectiveness of various engineering control approaches for several kinds of construction operations and equipment, and contains recommendations for work practices and respiratory protection.
13Enforcement National Emphasis Program National Emphasis Program – Crystalline Silica (CPL , 1/24/2008)Local Emphasis Program – Concrete Block and Brick, Concrete Products and Ready-Mixed Concrete (CPL ) – Pittsburgh Area Office
14Letters of Interpretation (LOIs) 02/11/Label requirements for crystalline silica.03/27/ &Special emphasis program for silicosis.05/12/ (a)(1) & (a)(2)Respirators for silica dust must be selected based on exposure levels.04/27/ Table Z-1; Table Z-3; ; (d); (g)Requirements for maintaining Material Safety Data Sheets (MSDSs) for coal including coal dust, fly ash, and silica dust.
15Wrap-up Identify, Quantify, Control Questions?? Thank you for your attention