1 / 30

Respirators and Dust Hazards

Respirators and Dust Hazards. Introduction. What is Dust? How is Dust generated? What types of Dust are there? Why is Dust Control necessary? What are the Health Hazards of Dust? How can Dust be controlled?. What is Dust?. One Micron-Size Dust Particle on a Pin Head.

palmer
Download Presentation

Respirators and Dust Hazards

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  1. Respirators andDust Hazards

  2. Introduction • What is Dust? • How is Dust generated? • What types of Dust are there? • Why is Dust Control necessary? • What are the Health Hazards of Dust? • How can Dust be controlled?

  3. What is Dust? One Micron-Size Dust Particle on a Pin Head

  4. How is Fresh Dust Generated? • When Ore is Broken by: • Impact • Abrasion • Crushing • Grinding • What ore sizing equipment do you have at your work site?

  5. How is Dust Recirculated? • Release of previously generated dust during such processing operations as: • Loading • Dumping • Transferring • What types of Loading, Dumping, or Transferring Equipment do you have?

  6. How is Dust Recirculated? • Also, dust can be recirculated by: • Wind • Movement of Workers • Movement of Equipment • What activities or conditions kick up dust at your mine?

  7. Dust Classification • Fibrogenic Dust (Causes Disease) • Crystalline Silica (Quartz) • Asbestos • Beryllium • Nuisance Dust - Dust that does not contain harmful quantities of asbestos & less than 1% quartz.

  8. Dust Classification by Size • Dust is classified by size into two primary categories. • Respirable Dust • Inhalable Dust

  9. Inhaleable Dust • Dust that enters the body, but is trapped in the nose, throat, and upper respiratory tract.

  10. 100 50 0 10 0 5 Particle Size in Microns Respirable Dust • Dust particles small enough (less than 10 Microns) to penetrate past the upper respiratory tract and deep into the lungs. Percent of Particles going deep into the Lungs

  11. Dust & the Respiratory System Human Respiratory System

  12. Why Control Dust? • Health Hazards • Occupational respiratory diseases • Irritation to eyes, nose, throat • Skin irritation • Damage to Equipment • Impaired Visibility • Community Relations • Can you think of other reasons?

  13. Health Hazards • The harm Dust can cause depends on the following: • Dust Composition • Dust Concentration • Particle Size and Shape • Amount of Exposure Time • Excessive exposure to harmful dusts can cause Pneumoconiosis - a dust related lung disease.

  14. Dust Related Deaths in Mich. • 1,426 deaths occurred from dust-related lung diseases in Michigan from 1968 to 1991. Information from NIOSH’s StateProfiles/Michigan Internet Web Site: http://www.cdc.gov/niosh/mi.html

  15. Dust Related Lung Diseases • Silicosis • Caused by Silica Dust • Black Lung • Caused by Coal Dust • Asbestosis • Caused by Asbestos Dust • Damage from these diseases is irreversible!

  16. Controling Dust Exposure - Safer Machinery & Tools • Fully enclosing dusty processes. • Local exhaust ventilation/dust collection equipment. • Tools with dust extraction (vacuum) devices. • Using water to suppress dust. • Operator enclosures with an air filtration system. • Use abrasives other than sand for abrasive blasting.

  17. Dust Control Systems

  18. Dust Control Systems

  19. Controling Dust Exposure - Safe Work Procedures • Wetting down dusty work areas or processes prior to work. • Working upwind of dust sources where possible. • Posting warning Signs where necessary. • Limiting Exposure time. • Training all employees on appropriate work procedures. • Good housekeeping practices.

  20. Controling Dust Exposure - Respiratory Protection • Fit testing of all employees required to wear respiratory devices. • Training employees in the proper use of respiratory devices. • Making sure employees understand the hazards of dust and the importance of respirator use. • Regular checking and cleaning of non-disposable respirators.

  21. Reasons for Repirators? • Certain Breathing conditions are hazardous to life and lung. • The air can be contaminated with: • Dusts, Mists, Fumes • Toxic Vapors • The air can have too little oxygen.

  22. How do we control these Airborne Hazards? • First - Use Engineering Controls to eliminate the hazard. • Second - Use Administrative Controls to reduce exposure to the hazard. • Last - Use Respirators as a temporary protective measure until Engineering and Administrative Controls are in place.

  23. 2 Basic Types of Respirators • Air Purifying Respirators • Used to filter out or neutralize contaminants • Examples: Dust; Organic Vapor • Air Supply Respirators • Used when there is a lack of oxygen, when the hazard is unknown or is undetectable by smell or taste. • Examples: Compressor & Hose; SCBA

  24. Filtering Respirators • Particulates - Dusts, Mists & Fumes • New Classes; N, R, P; 95, 99, 100 • Non-Resistant(Oil), Resistant(Oil), (Oil) Proof • Toxins - Organics, Acids, etc. • Neutralizing or Absorbing • Filtering Respirators are Hazard Specific • Don’t expect one respirator to protect you from all hazards!

  25. How long do Respirators last? • Particulate (Dust) Filtering Respirators • Change them when the breathing resistance gets high. • Toxin Filtering Respirators • Change when you first smell or taste a contaminant (Break-through)

  26. Health Conditions that Interfere with Respirator Use • Heart Conditions • Asthma or other breathing problem • Claustrophobia (fear of enclosed space) • Missing Teeth

  27. Other Conditions that can Interfere with Respirator Use • Contact Lenses • Eyeglass Temples (certain types) • Skullcaps (Beanies)

  28. Respirators Used at Your Workplace • How to don your respirator. • Look at the manufacturer’s instructions. • How to clean & Maintain your respirator. • Look at the manufacturer’s instructions. • How to Self-Fit Test your respirator. • Not possible with Filter-Face Types • Look at the manufacturer’s instructions.

  29. Quiz • Silicosis is a disease whose effects can be reversed, given time. • True • False

  30. Quiz • Dust respirator masks are not the preferred protection from dust because: • A. They can leak if not fitted properly. • B. They are uncomfortable to wear. • C. They cost very little. • D. Both A & B

More Related