Heat Stress Monitoring Program Flashcards
What is heat stress?
any combination of air temperature, thermal radiation, humidity, airflow, and work load which stress the body as it attempts to regulate temperature.
when does heat stress become excessive
when the body’s capability to adjust is exceeded.
list the factors causing heat stress
thermal radiation
ventilation
humidity
air/sea water
sources of thermal radiation
sun heat sources (incinerators, engines, generators, dryers..)
sources of ventilations
forced air systems
forced exhaust systems
sources of humidity
steam engines
bilge water
condensation
examples of air/sea water temperature
intake valves that use outside air/water for cooling of shipboard equipment
e.g. refrigerator units, engines, generators, evaporators
define acclimatization
the act of being accustomed to temperature or new environment
the body becomes more efficient in coping with heat stress
how long does acclimatization usually take
usually 3 weeks or more
what are some personal factors contributing to heat stress
past exposures to heat injuries current health status and use of medication exercise and fluid intake medication alcohol intake lack of lseep drugs
areas of the ship with common heat stress conditions
machinery spaces laundry sculleries incinerator room flight decks
what are some contributors to heat stress
steam and water leaks boiler air casing missing/deteriorated thermal insulation ventilation deficiencies weather conditions arduous operation
what is a PHEL Chart
a set of 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 established the PHEL curves and work rates
Industrial Hygienist and NAVSEA when a class of ships is designed and place into service
who determines the individual heat stress condition locations
industrial hygienist
4 classifications for assignment of phel curves
routine operations
non routine operations
ECC exercises
heavy work load
stay time (work/rest cycles)
maximum allowable time personnel may work in heat stress conditions at a given workload
how do you decide recovery time?
is defined as minimum of twice the stay time as determine by the PHEL chart or 4 hours whichever is shorter
definition of fuel combustion gases (stack gas)
combustion gases which may accumulate in a space due to inadequate ventilation or machinery malfunction
what increases the physiological effects on exposure to stack gas
heat stress conditions
how does heat stress increase physiological effects of stack gas
vasodilatation on peripheral blood vessels which results in further impairment of the cardiovascular system
signs and sx of stack gas
water eyes
dyspnea
tingling or numbness of the tip of the tongue, tip of the nose, finger tops or toes
mild sensation of alcohol intoxication
what are actions if signs and sx of stack gas are present
reduce exposure limits if two or more of the exposure symptoms are detected
determine new PHEL using table B2-A-5 or divided current PHEL stay time by 3
training requirement periodicity for heat stress
MDR must provide training for new check ins at indoc, and annually thereafter
Film “Play it cool: heat stress prevention afloat”
minimum training must include
hazards sx of exposure heat stress first aid heat stress monitoring causes of heat stress
heat stress monitors must receive training within how many weeks of assignment
12 weeks
which PQS must heat stress monitors complete
318 of the safety programs afloat personnel qualifications standard, NAVEDTRA 43704
heat stress injuries required reporting avenues
1) accident and injury report
2) WESS report
3) NDRS (Naval Disease Reporting System)
4) Medical event report if command does not have access to NDRS.
who reviews the heat stress monitoring reports
SMDR for inaccuracies and QA checks. recommendations based on crew health status
who makes notation of any existing problems and corrective actions implemented
Supervisor or Engineering Officer of the Watch (EOOW)
heat stress surveyor must check to ensure what
WB < DB, GT >/= DB, and WB < WBGT < GT
The drill supervisor must be informed of what prior to Engineering Casualty or DC training team drills
current STAY TIMES
routine reports where no administrative controls are required are submitted when…
8 o clock reports
Heat stress surveys that have reduced Stay Times must be routed through who before work shift alterations occur
the chain and CO notification achieved
ALL REPORTS are maintained for how long?
by the SMDR for one year
SAMS generated reports are authorized and can be maintained on file for what inspections
periodic inspections by ISIC or higher authority
Evaluation equipment elements: Dry Bulb Thermometer
measures the ambient air temperature at works where heat stress conditions exist.
indicator for further heat stress monitoring by the use of a WBGT meter
Placement of Hanging Dry Bulb
permanently mounted at watch or work stations where heat stress conditions exist.
may be temporarily mounted.
must be properly shielded from radiant heat levels or other influencing (heat/cold) factors.
accuracy of dry bulb thermometer
must be within 5 degrees F of the WBGT meter to be representative of the workspace temperature
if not within 5 degrees F of the WBGT, the dry bulb thermometer shall be re positioned to ensure representative temperature
reading of DB temperatures normal periodicity
every 4 hours for manned spaces if DB temp does not exceed 85 degrees
DB temperatures must be read and recorded hourly in these instances
heat casualties
if DB temperature exceeds 85 degrees F
Recording of DB temperatures: Routine
recorded on log sheet
reviewed by supervisor once each watch or shift
Recording of DB temperatures: high temperatures
circle in red 100 degrees F or higher DB temperatures
notify supervisor immediately
heat stress monitor shall monitor all workstations within that space with WBGT meter
Dry Bulb Temperatures shall be recorded on what during the WBGT monitoring
Heat Stress Monitoring Sheet
Dry Bulb Temperatures shall be recorded on what during the WBGT monitoring
Heat Stress Monitoring Sheet
Evaluation Equipment Individual Elements: Heat Stress Meter
independently measures DB temp sensor (ambient), Web Bulb sensor (humidity), globe (radiant), WBGT index.
Purpose of the Heat Stress Meter
helps determine the physiological Heat exposure limit (PHEL) and environmental heat stress conditions by computing the WBGT index.
types of Heat Stress Meters
only approved by WBGT meter/monitors can be used:
RSS-220 WBGT meter
QUESTemp 48N Heat stress monitor
required monitoring conditions
all manned watch/workstations within the space whenever the temperature form a permanently mounted hanging DB thermometer reaches or exceeds requirements.
required monitoring temperature requirements: PHEL I through III
when watch work length is 4 hours or less and DB is equal or greater than 100 degrees.
required monitoring temperature requirements PHEL I through III when watch/workstations is greater than 4 hours and DB is equal to or greater than 90 degrees
EVALUATE THIS CARD
required monitoring conditions outside of PHEL requirements
any space where a heat causality occurs
during a drill that exceeds 3 hours in duration (not required in areas not affected by the drill)
when directed by the commanding officer
acceptable range for calibration checks (RSS-220)
acceptable range is 100.0 + or - .2 degrees F if the meter is operating properly.
wait how long for initial DB reading and how long for subsequent reading (RSS-220)
5 min initial and 3 min subsequent
DB/WB should face air flow T or F? (RSS-220)
True
How far do you hold WBGT meter away from chest level (RSS-220)
approximately 1 foot away from the body
QUESTemp 48N: battery voltage less than or equal to how many volts indicates a replacement or recharge of batteries
6.4
QUESTemp 48N: sensors require how many minutes after turning the monitor on to initial reading
10 min
QUESTemp 48N: if the meter is moved from one site to another, the meter should be at each site for how many minutes to allow for stabilization?
5 min
QUESTemp 48N: how far away from chest level do you hold from the body
18”
Automated Heat Stress System (AHSS) must be mounted in what position
so that they indicate the most accurate representative temperature for the area where workers and watch standers spend the majority of their time
Is calibration required for the AHSS?
No.
What is the equation to determine WBGT index:
(0.1 x DB) + (0.7 x WB) + (0.2 x GT)
