Industrial hygiene BY Muhammad Fahad Ansari 12IEEM14

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Muhammad Fahad Ansari 12IEEM14

Muhammad Fahad Ansari 12IEEM14

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  • 1. 1
  • 2. Industrial HygieneIndustrial hygiene is defined as the recognition, evaluation, and control of workplace hazards.Its origins are based on limiting personal exposures to chemicals, and have evolved to address the control of most other workplace hazards including over-exposure to noise, heat, vibration, and repetitive motion 2
  • 3. OSH Act of 1970 The purpose of the OSH Act is to “assure so far as possible every working, man and woman in the nation safe and healthful working conditions and to preserve our human resources.” 3
  • 4. EnvironmentalFactors or StressesChemical hazards gases, vapors, dusts, fumes, mists, and smokePhysical hazards radiation, noise, vibration, extreme temperatures and pressures 4
  • 5. EnvironmentalFactors or StressesErgonomic hazards workstation design, repetitive motion, improper lifting/reaching, poor visual conditionsBiological hazards insects, mold, fungi, bacteria, and viruses 5
  • 6. Routes of EntryInhalation airborne contaminantsAbsorption penetration through the skinIngestion eating drinking 6
  • 7. OSHA Hierarchy of Control Engineering controls Work practice controls Administrative controls Personal protective equipment (PPE) 7
  • 8. Types of ExposureAcute Short term period between exposure and onset of symptomsChronic Long time period between exposure to an agent and the onset of symptoms 8
  • 9. Types of Air ContaminantsParticulates dusts, fumes, mists, and fibers non respirable particles  > 10 µm in diameter respirable particles  < 10 µm in diameter 9
  • 10. Types of Air ContaminantsFumes volatilized solids condenses in cool air  < 1.0 µm in diameter hot vapor + air (reaction with) = oxideMists suspended solid droplets generated by a condensation of liquids from a vapors to a liquid state 10
  • 11. Types of Air ContaminantsFibers solid, slender, elongated structures length several times the diameterGases formless fluids that expand to occupy a space  arc-welding, internal combustion engine exhaust air Vapors liquid changed to vapor  organic solvents 11
  • 12. Hearing Conservation ProgramMandatory at an 8-hour TWA > 85 dBAExposure monitoringAudiometric testingHearing protectionEmployee trainingRecordkeeping 12
  • 13. ProtectionThe selection of appropriate personal protective equipment for exposure control often requires both an understanding of the limitations of the equipment, and the expected exposure parameters as determined by an industrial hygiene evaluation. Engineering controls are considered the preferred method of control, but personal protective equipment plays an important role for health, safety, and rescue. The potential for misuse or misapplication of these devices should be evaluated. 13
  • 14. Industrial Hygiene  ANTICIPATION  RECOGNITION  EVALUTION  CONTROL 14