Heat Stress - PowerPoint PPT Presentation

1 / 20
About This Presentation
Title:

Heat Stress

Description:

Heat Stress UW-EC Facilities Planning & Management By: Chou Lor Heat Stress Training Objectives: Background Factors Heat Stress Hazards Heat Stress Control Measures ... – PowerPoint PPT presentation

Number of Views:105
Avg rating:3.0/5.0
Slides: 21
Provided by: lorc
Learn more at: http://www.uwec.edu
Category:
Tags: heat | stress

less

Transcript and Presenter's Notes

Title: Heat Stress


1
Heat Stress
  • UW-EC
  • Facilities Planning Management
  • By Chou Lor

2
Heat Stress
  • Training Objectives
  • Background Factors
  • Heat Stress Hazards
  • Heat Stress Control Measures
  • Prevention of Heat Stress

3
Heat Stress
  • What is Heat Stress?
  • The combination of environmental and physical
    work factors that constitute the total heat load
    imposed on your bodys cooling system.

4
Heat Stress
  • Bodys Cooling System
  • Blood is pumped close to skin for cooling
    reducing blood going to the brain and rest of
    your body.
  • As temperatures rise, surface blood vessels get
    bigger and pulse rate goes up.
  • As temperatures rise your body gains heat instead
    of losing it.

5
Heat Stress
  • Bodys Cooling System Cont.
  • Most people lose about a quart of sweat/hr in
    extreme heat.
  • This adds a strain to your circulatory system
    which now has to lower the amount of blood in
    your body.

6
Heat Stress
Mechanisms for heat loss/transfer
Evaporation
Radiant Heat
Convection
Conduction
7
Heat Stress
  • Mechanisms for heat loss/transfer
  • Evaporation
  • The body transfers water vapor to the skin
    through pores and sweat glands
  • Background Heat Exchange

8
Heat Stress
  • Background Heat Exchange Cont.
  • Mechanisms for heat loss/transfer
  • Conduction
  • The direct transfer of heat from skin to the
    surrounding air as the ambient temp rises
  • Convection
  • Air blowing over the skin e.g. use fan
  • Radiation
  • The transfer of heat to or from surrounding
    objects that are not in direct contact with the
    body

9
Heat Stress
  • Types of Heat Stress

10
Heat Stress
  • Heat Stress Hazards Cont.
  • Heat Rash
  • Cause
  • Hot humid environment
  • Skin is constantly wet from sweat
  • Sweat gland ducts become plugged
  • Signs Symptoms
  • Painful or itchy skin
  • Blister-like rash
  • Treatment
  • Keep skin clean and dry
  • Stay cool with air conditioning
  • Fans and cool showers
  • Wear lightweight loose-fitting clothing
  • Prevention
  • Shower after working in hot environment
  • Keep skin clean and dry

11
Heat Stress
  • Heat Stress Hazards Cont.
  • Heat Fatigue
  • Cause
  • Lack of acclimatization
  • Depletion of water and salt due to sweating
  • Signs Symptoms
  • Discomfort
  • Feeling of weakness and tiredness
  • Impaired performance of skilled tasks in heat
  • Inability to concentrate
  • Treatment
  • No treatment necessary unless other signs of heat
    illness are present
  • Prevention
  • Acclimatization of workers for work in the heat

12
Heat Stress
  • Heat Stress Hazards
  • Heat Cramps
  • Cause
  • Heavy sweating during hot work, drinking large
    amount of water without replacing salt loss
  • Signs Symptoms
  • Painful muscle spasms of arms, legs and stomach
  • Usually occur after heavy sweating and may begin
    towards the end of the workday
  • Treatment
  • Drink water, move to a cool shaded area
  • Spray the person with water and massage the cramp
  • Adequate salt intake at meals, try eating more
    fruits
  • Prevention
  • Adequate salt intake with meals, and adequate
    water intake
  • Drink fluids regularly

13
Heat Stress
  • Heat Stress Hazards Cont.
  • Heat Exhaustion
  • Cause
  • Dehydration causes blood volume to decrease
  • Inadequate salt and water intake causes a
    persons bodys cooling system to break down
  • Signs Symptoms
  • Fatigue, weakness, dizziness, faintness
  • Nausea, headache, heavy sweating
  • Low to normal blood pressure
  • Treatment
  • Move person to a cool shaded area
  • Provide cool water to drink
  • Fan and spray with cool water
  • Prevention
  • Acclimatize worker using a work rest
  • Drink plenty of water

14
Heat Stress
  • Heat Stress Hazards Cont.
  • Heat Stroke
  • Cause
  • Partial or complete failure of sweating mechanism
  • Body cannot get rid of excess heat
  • Sign Symptoms
  • Hot dry skin, elevated body core temperature,
    confusion, loss of consciousness
  • Fatal if treatment is delayed
  • Treatment
  • Medical emergency
  • Move the victim to a cool shady area
  • Remove excess clothing
  • Spray the person with cool water
  • Prevention
  • Monitor workers in sustained work in severe heat
  • Drink plenty of water
  • Drink cool fluids that do not contain caffeine

15
Heat Stress
  • Heat Stress Control Measures
  • Engineering Controls
  • Reduction of Humidity
  • Reduce the temperature and humidity through air
    conditioning
  • Provide air-conditioned rest areas.
  • Ventilation and Air Conditioning
  • Use of air-circulating fans
  • Better ventilation, to draw heat and steam away
    from work areas
  • Shielding between workers and heat sources

16
Heat Stress
  • Heat Stress Control Measures
  • Administrative Controls
  • Changing the rate of work
  • Schedule hot jobs to cooler times of the day.
  • Increase the frequency and length of rest breaks
    if possible
  • Encouraged employees to take a rest break should
    any sign of heat stress or heat disorder develop.
  • Allow for slower-paced work during the hottest
    periods of the day
  • Limiting duration of exposure time
  • Rotate work activities

17
Heat Stress
  • Heat Stress Control Measures Cont.
  • Protective Clothing
  • Light summer clothing should be worn to allow
    free air movement and sweat evaporation.
  • Outside, wear light-colored clothing.

18
Heat Stress
  • Prevention of Heat Stress
  • Supervisor
  • Identify all hot work environments under his/her
    authority
  • Ensure that employees have been trained in hot
    working environments
  • Train workers to recognize signs symptoms of
    heat stress disorders and be prepared to give
    first aid if necessary.
  • Avoid placing employees in hot work environments
    for extended time periods. Realize individual
    employees vary in their tolerance to heat stress
    conditions.

19
Heat Stress
  • Prevention of Heat Stress
  • Employees
  • Learn to recognize the symptoms of heat stress.
    Change work location, taking adequate rest
    periods (in shade or cooler environment).
  • Become familiar with the hazards associated with
    working in hot environments
  • Use adequate fans for ventilation and cooling,
    especially when wearing personal protective
    equipment (PPE).
  • Wear light colored, loose (unless working around
    equipment with moving parts) clothing.
  • Keep shaded from direct heat where possible
    (e.g., wear a hat in direct sunlight).
  • Drink plenty of water. In hot environments the
    body requires more water than it takes to satisfy
    thirst.

20
Any Questions
??
Reach me by email.Thank you.
Write a Comment
User Comments (0)
About PowerShow.com