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Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
Feeling the heat for slideshare
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Feeling the heat for slideshare

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  • 1. Feeling the Heat – Managing Risks from Heat Stress at Work Mike Slater (President Elect)
  • 2. Human beings create heat
  • 3. 100 Watts 200 Watts 800 Watts
  • 4. 100 Watts 200 Watts 800 Watts The more physically demanding our activity, the more heat we’re producing
  • 5. We have to lose heat to the environment – but not too much
  • 6. But we can gain heat from to the environment too
  • 7. Radiation Convection
  • 8. Evaporation Radiation Convection
  • 9. Heat stroke Heat exhaustion Heat syncope Heat cramps Prickly heat
  • 10. Heat stroke Heat exhaustion Heat syncope Heat cramps Prickly heat
  • 11. Source: WHO
  • 12. Heat stroke Heat exhaustion Heat syncope Heat cramps Prickly heat
  • 13. Evaporation Radiation Convection
  • 14. Air temperature Humidity Mean radiant temperature Air velocity These are the environmentl factors we have to consider when assessing the risk of heat stress
  • 15. Air temperature Humidity Clothing Mean radiant temperature Metabolic rate Air velocity
  • 16. Air temperature Clothing Mean radiant temperature Acclimatisation Humidity Metabolic rate Air velocity And there are other factors we need to consider
  • 17. Air Temperature Standard thermometer
  • 18. Humidity
  • 19. Radiant heat Globe thermometer
  • 20. Air Velocity
  • 21. Metabolic rate 1 Met = 58 Wm-2
  • 22. Clothing 1 Clo = Insulation value of 0,155 m2 oC/W
  • 23. Acclimatisation YES ? OR NO?
  • 24. Air movement Humidity Work rate Mean radiant temp. Air temp. Clothing Heat stress index Acclimn
  • 25. A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures
  • 26. A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures
  • 27. A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures
  • 28. Screening methods Talking to people Observations Checklists
  • 29. This looks complicated, but we can probably identify the risk factors fairly easily
  • 30. A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures
  • 31. WBGT Index Indoors WBGT = 0.7 tnwb + 0.3 tg Outdoors WBGT = 0.7 tnwb + 0.2 tg + 0.1 ta
  • 32. ACGIH TLVs for Heat Stress Allocation of work in work Light cycle Moderate Heavy 75% to 100% 31.0 28.0 - 50% to 75% 25% to 50% 0 to 25% 29.0 30.0 31.5 27.5 29.0 30.5 31.0 32.0 32.5 Workload V ery heavy 28.0 30.0
  • 33. A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures
  • 34. A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures
  • 35. Physiological assessment Temperature Heart rate
  • 36. Miner’s Core Temperature & Heart Rate Source: OHTA.
  • 37. The risks here are more complex – an expert evaluation is likely to be needed
  • 38. A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures
  • 39. Hierarchy of Control Prevention Engineering Working Practices Personal Protection
  • 40. Hierarchy of Control Prevention Engineering Working Practices Personal Protection Let’s look at some examples of typical controls
  • 41. Insulation of hot surfaces to reduce radiant and convective heat www.lubisol.com
  • 42. Extracting hot air
  • 43. Blowing in cool air http://mikegigi.com
  • 44. Providing protective clothing
  • 45. Regular drinks of water
  • 46. Management Measures Screening & health surveillance Information, instruction, training Supervision Self regulation Provide water
  • 47. Hierarchy of Control Supervision Prevention Maintenance Auditing Engineering Working Practices Personal Protection Water Health surveillance Monitoring Information Training
  • 48. Further Information
  • 49. http://www.hse.gov.uk/temperature/thermal/index.htm
  • 50. http://www.bohs.org/resources/res.aspx/Resource/filename/840/TG12.pdf http://www.bohs.org/resources/res.aspx/Resource/filename/1473/04_TG12_Addendum_to_2nd_Edition.pdf
  • 51. President-elect@bohs.org www.bohs.org Twitter: @bohsworld www.slideshare.net/mikeslater

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