Heat Stress Evaluation – Program


 8:30 am  Introduction
An overview of hazards of exposure to excessive heat. The effects of heat on the body – physiological responses to heat stress, core temperature limitations. Heat disorders – heat stroke, heat collapse, heat exhaustion, heat cramps, heat rash. Typical hot working environments – hot dry vs. hot humid. Heat transfer mechanisms. Environmental factors that contribute to heat stress – temperature, humidity, air velocity. Personal factors – health status, fitness and metabolic heat load. Effect of other concurrent exposures.
 9:15  The Physiological Response to Heat Stress
Heat balance and its control – thermoregulation in the body. Effect of heat on heart rate, blood flow and sweat loss. Mechanism of acclimatization to heat. Environmental factors influencing heat loss through sweating – humidity, clothing.
 10:00  Break
 10:15  Evaluation of Heat Stress
The various indices that have been used to quantify heat stress will be discussed, with particular emphasis on the WBGT. ACGIH Exposure limits based on the WBGT and work rest regimens will be introduced. The use of Humidex to assess comfort in non-industrial environments will be discussed. The limitations of using calculated assessments of heat stress with a heterogeneous worker population will be stressed and the importance of the workers’ subjective assessment of heat strain will be emphasized.
 11:15  Heat Stress Instrumentation
The classical evaluation of hot environments with dry bulb, wet bulb and globe thermometers will be discussed. Instrumentation currently available to measure WBGT more efficiently, and personal heat stress monitors to measure heat strain will be described and demonstrated.
 12:00  Lunch
 1:00 pm  Practical Exercises
Practical exercises will be performed using data-logging environmental heat stress monitors and personal heat strain instruments. Common sources of error with this equipment will be demonstrated.
 2:30  Heat Stress Calculations
Some typical calculations associated with evaluating heat stress will be discussed and example problems will be solved.
 3:00  Break
 3:15  Control of Heat Exposure
An overview of engineering controls, administrative controls personal protective equipment and worker education that can minimize the hazards of heat exposure. Work practices to reduce heat stress – work-rest schedules, replacement of water and salt, worker training and education. The influence of clothing ensembles in different thermal environments. The importance of acclimatizing workers and the dangers of loss of acclimatization while away from work. Current ACGIH exposure limits to minimize heat stress and the interpretation of these limits.
4:15 Evaluation
4:30 Adjournment


Course Fee: $400.00 plus 13% H.S.T. (total $452.00)

Payment must be received at least 30 days before the course date to ensure a place. The course fee includes course manual and materials. A $150 cancellation fee is payable for cancellation less than 10 business days before the course begins.

Registration Form (PDF)

ALARA Industrial Hygiene Services Ltd. 103 Parkview Hill Crescent, Toronto, ON Canada M4B 1R5
(416) 759-9579    info@alaraihs.com