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Health & Medicine

Published on March 2, 2014

Author: mikeslater

Source: slideshare.net

Feeling the Heat – Managing Risks from Heat Stress at Work Mike Slater (President Elect)

Human beings create heat

100 Watts 200 Watts 800 Watts

100 Watts 200 Watts 800 Watts The more physically demanding our activity, the more heat we’re producing

We have to lose heat to the environment – but not too much

But we can gain heat from to the environment too

Radiation Convection

Evaporation Radiation Convection

Heat stroke Heat exhaustion Heat syncope Heat cramps Prickly heat

Heat stroke Heat exhaustion Heat syncope Heat cramps Prickly heat

Source: WHO

Heat stroke Heat exhaustion Heat syncope Heat cramps Prickly heat

Evaporation Radiation Convection

Air temperature Humidity Mean radiant temperature Air velocity These are the environmentl factors we have to consider when assessing the risk of heat stress

Air temperature Humidity Clothing Mean radiant temperature Metabolic rate Air velocity

Air temperature Clothing Mean radiant temperature Acclimatisation Humidity Metabolic rate Air velocity And there are other factors we need to consider

Air Temperature Standard thermometer

Humidity

Radiant heat Globe thermometer

Air Velocity

Metabolic rate 1 Met = 58 Wm-2

Clothing 1 Clo = Insulation value of 0,155 m2 oC/W

Acclimatisation YES ? OR NO?

Air movement Humidity Work rate Mean radiant temp. Air temp. Clothing Heat stress index Acclimn

A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures

A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures

A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures

Screening methods Talking to people Observations Checklists

This looks complicated, but we can probably identify the risk factors fairly easily

A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures

WBGT Index Indoors WBGT = 0.7 tnwb + 0.3 tg Outdoors WBGT = 0.7 tnwb + 0.2 tg + 0.1 ta

ACGIH TLVs for Heat Stress Allocation of work in work Light cycle Moderate Heavy 75% to 100% 31.0 28.0 - 50% to 75% 25% to 50% 0 to 25% 29.0 30.0 31.5 27.5 29.0 30.5 31.0 32.0 32.5 Workload V ery heavy 28.0 30.0

A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures

A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures

Physiological assessment Temperature Heart rate

Miner’s Core Temperature & Heart Rate Source: OHTA.

The risks here are more complex – an expert evaluation is likely to be needed

A Structured Approach to Heat Stress Risk Assessment Identify Hazards Assess Risk using screening methods WBGT Index Identify Controls Expert analysis PHS Index Expert analysis Physiological measures

Hierarchy of Control Prevention Engineering Working Practices Personal Protection

Hierarchy of Control Prevention Engineering Working Practices Personal Protection Let’s look at some examples of typical controls

Insulation of hot surfaces to reduce radiant and convective heat www.lubisol.com

Extracting hot air

Blowing in cool air http://mikegigi.com

Providing protective clothing

Regular drinks of water

Management Measures Screening & health surveillance Information, instruction, training Supervision Self regulation Provide water

Hierarchy of Control Supervision Prevention Maintenance Auditing Engineering Working Practices Personal Protection Water Health surveillance Monitoring Information Training

Further Information

http://www.hse.gov.uk/temperature/thermal/index.htm

http://www.bohs.org/resources/res.aspx/Resource/filename/840/TG12.pdf http://www.bohs.org/resources/res.aspx/Resource/filename/1473/04_TG12_Addendum_to_2nd_Edition.pdf

President-elect@bohs.org www.bohs.org Twitter: @bohsworld www.slideshare.net/mikeslater

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