A guide to keeping your cool !!!!
November 28, 2022
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
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
The purpose of this tool kit is to provide workplace parties with
Recognize the symptoms
Assessing the risk
Putting together an effective control program
Purpose of this heat stress tool kit
Factors that Influence Heat Stress
The heating and cooling of the body depends on the following factors:
Radiant heat load
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
The body cools itself by evaporating sweat.
High humidity hinders sweat from evaporating
Can you get used to heat?
The body will get used to working in a hot environment gradually
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
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.
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
Humidex Action Recommended
30 - 37
Post heat stress alerts
38 - 39
Reduce physical activity
Drink a cup of water every 20 minutes
Further reduce physical activity
Drink a cup of water every 15 – 20 minutes
42 - 44
Severely curtail physical activity
Ensure sufficient rest/recovery time
Drink a cup of water every 10 – 15 minutes
Hazardous to continue physical activity
3. Select a measurement location
Divide the workplace into zones that have similar heat
Select a representative location in each zone where you can
4. Measure workplace temperature and humidity.
5. Adjust for radiant heat
Look at heat stress
calculator on next slide
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