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A Guide to Heat Stress1.ppt

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A Guide to Heat Stress1.ppt

  1. 1. Heat Stress A guide to keeping your cool !!!! November 28, 2022
  2. 2. Is Heat Stress a concern in your workplace?  Has anyone been affected by heat in your workplace?  Are fans needed to keep workers cool?  Is work done in direct sunlight?  Do workers wear extra clothing/protective equipment that can make them hot?  Have workers ever expressed concern about heat in the workplace?  Chances are that you have answered YES to one or more of theses questions. Actually “Heat Stress” is something most workplaces must deal with – not just those who work in the hot sun or beside heat producing machinery.
  3. 3. The purpose of this tool kit is to provide workplace parties with strategies to:  Recognize the symptoms  Assessing the risk  Putting together an effective control program Purpose of this heat stress tool kit
  4. 4. Factors that Influence Heat Stress  The heating and cooling of the body depends on the following factors:  Air temperature  Humidity  Radiant heat load  Physical activity  Cooling  Body adjustments
  5. 5.  There are two sources of heat exposure, the outside environment and internal muscle activity. 80% of the muscle activity is converted into body heat.  High temperatures and high levels of physical activity create heat stress.  The body cools itself by evaporating sweat.  High humidity hinders sweat from evaporating
  6. 6. Can you get used to heat?  Yes  The body will get used to working in a hot environment gradually over time.  This process of the body becoming more efficient at cooling itself down is known as “acclimatization”  The body redirects blood to the skin’s surface  The heart becomes more efficient  Sweating starts sooner and there is more of it  Sweat contains less salt
  7. 7. Heat Rash, Sunburn and Heat Cramps
  8. 8. Causes, Symptoms and Treatment
  9. 9. 5 Steps to Managing Heat Stress 1. Training: measurements by themselves cannot guarantee a worker protection from heat stress. It is essential that workers learn to recognize the early signs and symptoms of heat stress and know how to prevent them.  If it is possible, workers need to be able to alter their pace of work, take rest breaks, and drink in response to early symptoms (a cup of water every 20 minutes.)  The ideal heat stress response plan would let workers regulate their own pace by “listening” to their bodies.
  10. 10. 2. Clothing;  The heat stress action chart on next slide assumes workers are wearing regular summer clothes  If the workers wear a double layer of woven clothing add 50 of Humidex to the workplace measurement  Estimate the correction factor for other types of clothing/protective equipment by comparing them with cotton overalls.  If completely encapsulating suits are worn, heat stress should be managed by monitoring vital signs as recommended
  11. 11. Humidex Action Recommended Low 30 - 37 Post heat stress alerts Drink water Medium 38 - 39 Reduce physical activity Drink a cup of water every 20 minutes Moderate 40-41 Further reduce physical activity Drink a cup of water every 15 – 20 minutes High 42 - 44 Severely curtail physical activity Ensure sufficient rest/recovery time Drink a cup of water every 10 – 15 minutes Extreme 45+ Hazardous to continue physical activity
  12. 12. 3. Select a measurement location  Divide the workplace into zones that have similar heat exposures  Select a representative location in each zone where you can take measurements.
  13. 13. 4. Measure workplace temperature and humidity. 5. Adjust for radiant heat Look at heat stress calculator on next slide
  14. 14. www.ohcow.on.ca/menuweb/heat_stress_calculator.htm
  15. 15. KEEP YOUR COOL !!!

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