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CONTROLLING THE STRESS OF THERMAL EXTREMES

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Presentation on theme: "CONTROLLING THE STRESS OF THERMAL EXTREMES"— Presentation transcript:

1 CONTROLLING THE STRESS OF THERMAL EXTREMES
…preventing adverse effects of exposure to heat stress

2 Background/Overview Humans function within a narrow range of temperature Examples of heat exposures in industry Extent of the heat stress problem among the earliest of OSHA targets, but… most industries have learned how to cope

3 Modes of Heat Transfer conduction convection radiation
direct contact convection surrounding air radiation from hot surfaces metabolism/metabolic heat due to activity

4 Factors Affecting Heat Exchange
temperature of solid surroundings air temperature skin temperature amount of sweat on exposed skin humidity air speed clothing time of exposure

5 Purpose of Engineering Controls
reduce air temperature reduce air humidity reduce radiant heat increase air movement/circulate air reduce physical work demand

6 Control of Heat Stress Engineering Controls
general ventilation local exhaust ventilation enclosure/isolation shielding area cooling/air conditioning fans dehumidification equipment modification others

7 Control of Heat Stress Administrative Controls/Work Practices
hydrate training/education rest periods scheduling acclimatization

8 Control of Heat Stress PPE
primary considerations: insulation value of clothing permeability ventilation of clothing reflective clothing auxiliary body cooling Wetted clothing, water-cooled garments, circulating air, ice packs, etc.

9 The current situation... Heat stress is a common potential risk.
Environmental limits have been suggested by NIOSH, ACGIH, etc. There is no regulatory standard, i.e., OSHA. Industries have developed their own ways of “dealing with” the heat stress problem. “Worker is his/her own best control!”

10 Resources ACGIH


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