Heat Stress Monitoring Program Flashcards
What instruction covers Heat Stress Monitoring?
OPNAVINST 5100.19
What is Heat Stress?
- Any combination of air temp, thermal radiation, humidity, air flow, & workload that stress the body as it attempts to regulate temperature
- Heat Stress becomes excessive when the body’s capability to adjust is exceeded
- Can cause heat injury/death
4 Environmental Factors Causing Heat Stress:
- Thermal Radiation
- Ventilation
- Humidity
- Air/Sea Water Temperature
Thermal Radiation
Sun
Heat Sources:
- Generators
- Dryers
- Incinerator
- Engines
What are the 2 Types of Ventilation?
- Forced Air Systems
- Forced Exhaust Systems
Forced Air Systems
Intake of outside air into workspace
(spot-cooling)
Forced Exhaust Systems:
Removes stagnant or increased concentrations of hazardous fumes or contaminants
(Red Devil Blowers)
Humidity:
Moisture in the air:
- Steam Leaks
- Bilge Water
- Condensation
Air/Sea Water Temperature:
Intake Valves that allow seawater/outside air to be utilized for cooling for shipboard equipment systems
- Refrigeration units
- Engines
- Generators
- Evaporators for fresh water consumption
What is Acclimatization?
-The act of becoming accustomed to temperature or new environment
-The body becomes more efficient in coping with heat stress
Occurs gradually
How long does acclimation of the body normally take to occur?
3 weeks
7 Personal Factors Associated with Heat Stress:
- Past exposure to heat injuries
- Current health status (G6PD & SCT)
- Dehydration
- Medication
- Alcohol
- Lack of sleep
- Drugs
5 Most Common Locations of Heat Stress Conditions
- (S)cullery (PHEL V)/Galleys
- (L)aundry
- (F)light deck
- (I)ncinerator room
- (M)achinery spaces
What are the 6 causes and contributors to Heat Stress Conditions?
- Steam and Water Leaks
- Ventilation Deficiencies
- Arduous Operation
- Boiler Air Casing Leaks
- Missing/Deteriorated Thermal Insulation
- Weather Conditions
What is PHEL?
Physiological Heat Exposure Limit
6 curves that compare the WBGT index and the degree of effort or work rate to determine the maximum permissible exposure to the heat stress environment
Who establishes the PHEL and Work Rates?
Industrial Hygienist and NAVSEA
Who determines the individual heat stress condition locations?
Industrial Hygienist
Who is responsible for creating a locally prepared form using the OPNAVINST 5100.19 as a guide for necessary information and routing instructions?
Local command
What are examples of routine operations?
Light work including:
- sweeping
- painting
- cleaning lube oil strainers
What are examples of non-routine operations?
- Increase in normal watch stander work rate, and minor equipment casualty
- Use the next higher PHEL when determining stay time
What does ECC Exercises mean?
Evacuation
Control
Center drills
What are examples of Heavy Work Load?
- replacing large valves
- cleaning lube oil sumps
- disassembly/reassembly of large or heavy equipment
What PHEL Curve is assigned to Heavy Workload?
PHEL VI (6)
What is Stay Time?
Work/Rest Cycles
Maximum allowable time personnel may work in heat stress conditions at a given workload
What is Recovery Time?
Minimum of twice the stay time as determined by the PHEL chart or 4 hours which ever is shorter
What is Fuel Combustion Gases?
Stack Gas
Combustion gases which may accumulate in a space due to inadequate ventilation or machinery malfunction
What are the Physiological Effects of exposure to Stack Gas?
- intensified by heat stress conditions
- Causes vasodilation on peripheral blood vessels which results in further impairment of the cardiovascular system
What action should you take if someone is showing S&S from stack gases?
- Reduce exposure limits if 2 or more of the exposure symptoms are detected
- Determine a new PHEL or divide current PHEL stay time by 3
What are the 4 S&S of stack gas?
- Watery eyes
- Dyspnea
- Tingling or numbness of the tip of the tongue, tip of the nose, finger tips, or toes
- Mild sensation of alcohol intoxication
How often must Heat Stress Training be conducted?
- During INDOC
- annually thereafter
Who must provide heat stress training?
SMDR
5 Training requirements for the Heat Stress Program
- Hazard
- Causes
- Symptoms
- First Aid
- Monitoring
Heat Stress Monitors must receive training within how many weeks upon assignment?
12 weeks/3 months
What PQS must be completed for Heat Stress surveyor watch station?
318
Where can personnel qualifications standards be found?
NAVEDTRA 43704
How do you report heat stress injuries?
Accident & Injury Report
Reports to the Naval Safety Center should be made using:
Web Enabled Safety System (WESS)
All Navy heat stress related injuries should be reported through what system?
Naval Disease Reporting System (NDRS)
What do you use to report A&I if your command does not have access to NDRS?
Medical Event Report
All heat stress monitoring reports will be reviewed by ______ for inaccuracies and QA checks.
SMDR
Supervisor or Engineering Officer of the Watch (EOOW) does what?
- makes notation of any existing problems
- corrective actions implemented
Prior to drills the drill supervisor must be informed of what?
STAY TIMES
Who are Heat Stress Surveys routed to for their comments and required actions, if any?
XO/CO
Routine Heat Stress reports with no administrative controls are required to be submitted at?
8 o’clock reports
Heat stress surveys that have reduced Stay Times must be routed through who?
Chain and CO
ALL REPORTS will be maintained by the SMDR for how long?
1 year
Dry Bulb Thermometer Function
- Measures the ambient air temperature at work sites where heat stress conditions exist
- Serves as an indicator for further heat stress monitoring by the use of a WBGT meter
Placement of Hanging Dry Bulb
- Shall be permanently mounted at watch and work stations where heat stress may exist
- May be temporarily mounted to monitor heat conditions at temporary work sites
- Must be properly shielded from radiant heat levels or other influencing (heat/cold) factors
DB Thermometer must be within how many degrees of the WBGT meter?
5 ºF
Dry Bulb Thermometers must be read and recorded hourly if:
- Heat Casualties
- If DB temperature exceeds 85°F
If not within 5 ºF of the WBGT, the dry bulb thermometer shall be
inspected & repositioned or replaced
If DB temperature does not exceed 85°F how often is it read?
Every 4 hours for manned spaces
Recording of DB Temperatures
(Routine ops)
- Record on log sheet
- Reviewed by supervisor once each watch or shift
Circle in red if DB temperatures is…
100ºF or higher
What 3 things do you do for high DB Temperatures?
- Circle in red 100ºF or higher DB temperatures
- Notify supervisor immediately
- Heat Stress Monitor shall monitor all workstations within that space with WBGT Meter
Dry bulb temperature sensor (ambient):
Temperature measured with alcohol-in-glass thermometer whose bulb is kept dry and shielded from radiation
Wet bulb temperature sensor (humidity):
Temperature measured with a thermometer, wet wick is fitted closely over the bulb
Globe (radiant) temperature sensor:
An integration of radiant and convective heat transfer, heating or cooling effects of air movement
WGBT Index
A measurement of environmental conditions (heat stress). Consists of a weighted average of dry bulb, wet bulb, and globe temperatures
What’s the purpose of calculating the WBGT Index?
Helps to determine the PHEL
What are the 2 only approved WBGT meter/monitors that can be used for Heat Stress?
- RSS-220: WBGT Meter
- QUESTemp 48N: Heat Stress Monitor
What 3 Conditions Require Monitoring?
- PHEL I through III: when work length is 4 hours or less and DB is equal or greater than 100°
- PHEL I through III: when work length is greater than < 4 hours and DB is equal or greater than 90°
- PHEL IV through VI and DB is equal or greater than 85°
When a survey resulted in a PHEL stay time less than the duration of the watch/workstation time then…
adjustment of the watch/workstation will be made. No further survey is required unless the DB temp increases by 5 degrees or returns to normal.
If the survey resulted in a stay-time greater than the duration of the normal watch/work period and did not require a change from the normal watch/workstation time then…
Follow-on surveys IS NOT required, unless the DB temperature increases by more than 5° from the hanging dry bulb temperature in the previous survey
Equation to determine WBGT Index:
(0.1 x DB)+(0.7 x WB)+(0.2 x GT)
Pg 108
What 3 other conditions require heat stress monitoring
- In any space, where a heat casualty occurs
- A drill that exceeds 3 hours in duration
- When directed by the CO
After turning the QUESTemp 48N ON, ensure the battery voltage displayed during the power-on sequence is less than or equal to ____ if not replace or recharge the batteries
6.4 volts
How do you hold the RSS-220?
At chest level
1 foot away from the body
How do you hold the QUESTemp 48N?
Chest level 18 inches away from the body
RSS-220 requires you to wait how long for initial and subsequent readings
Initial: 5min
Subsequent: 3min
QUESTemp 48N requires you to wait how long for initial and subsequent readings
10 min after turning the monitor on
5min between sites
Calibration for RSS-220
Acceptable range is 100.0 + or - 0.2 degrees Fahrenheit, if the meter is operating properly
What do you do with exposure limits that are less than the watch period?
circle in red
