unit 5 -5 heat stress Flashcards
heavy work
PHEL?
manually chipping and wire brushing in preparation for painting,
handling cargo and supplies, replacing large valves, cleaning lube oil sumps,
disassembly or reassembly of large or heavy equipment.
set stay time at PHEL VI
define heat stress
any combination of air temp., thermal radiation, humidity, airflow, and work load which stress the body as it attempts to regulate temperature
factors that cause heat stress
environmental
personal
list all 4 environmental factors that cause heat stress
thermal radiation
ventilation
humidity
air/sea water temperature
list examples of thermal radiation
sun heat sources (incinerator, engines, generators, laundry dryers, etc)
list examples of ventilation- airflow
forced air systems
forced exhaust systems
red devil blowers?
list examples of humidity- moisture in the air
steam leaks
bilge water
condensation
list examples of air/sea water temperature
refrigeration units
engines
generators
evaporators for fresh water consumption
define acclimatization
act of becoming accustomed to temperature or new equipment
occurs gradually within 3 weeks
list personal factors contributing to heat stress
past exposure current health status exercise and fluid intake medication alcohol intake lack of sleep drugs
what are the most common spaces on ship where heat stress injuries occur
machinery spaces laundries sculleries (PHEL V)/ Galleys incinerator room flight decks
list the contributors to heat stress conditions aboard ship
steam and water leaks boiler air casing leaks missing/ deteriorated thermal insulation ventilation deficiencies weather conditions arduous operation
what does PHEL stand for
Physiological Heat Exposure Limit
what is a PHEL Chart used for
6 curves that compare WBGT INDEX and degree of effort or work rate to determine the maximum permissible exposure to the heat stress environment
who establishes the PHEL Curve and work rates
industrial hygienist ( individual heat stress condition locations) NAVSEA
who creates the heat stress form for a command
local command
define routine operations
light work include sweeping down, painting, cleaning lube oil strainers
define non-routine operations
using the next higher PHEL for stay times
increase normal watch stander work rate and minor equipment casualty
ECC Exercises
Evacuation Control Center drills
Define Stay time aka watch rotation
maximum allowable time personnel may work in heat stress conditions at a given workload
recovery time
minimum of twice the stay time as determined by the PHEL chart or 4 hours, whichever is shorter
fuel combustion gases (stack gas)
combustion gases which may accumulate in a space due to inadequate ventilation or machinery malfunction
causes vasodilation on peripheral blood vessels which further impairs cardiovascular system
signs and symptoms of fuel combustion gases
watery eyes
dyspnea
tingling or numbness of the tip pf the tongue, nose, fingers/toes
mild sensation of alcohol intoxication
if 2+ detected reduce exposure limits
uses tale B2-A-5 of divide PHEL stay time by 3
who must provide heat stress training during indoc and annually
MDR
heat stress training at a minimum must include
hazard symptoms of exposure heat tress first aid heat stress monitoring causes of heat stress
Heat Stress Monitors must complete what training in what time frame
heat stress surveyor watch station 318
NAVEDTRA 43704
within 12 weeks upon assignment
what are the requirements for REPORTING heat stress injuries
- accident and injury report
- report to Naval Safety Center using Web Enabled Safety System (WESS)
- using Naval Disease Reporting System (NDRS)
- use Medical Event Reporting format if CMD doesnt have access to NDRS
who is responsible for QA checks on heat stress surveys
SMDR
-
what is the ><= of temps you must ensure as a surveyor
- WB < DB <=GT
- WB < WBGT < GT
how must reduced stay times be routed
through chain and CO notification
how long are heat stress survey reports maintained
1 year by SMDR
who will make notation of any existing problems and corrective actions implemented
supervisor or engineering officer of the watch (EOOW)
where should hanging dry bulb thermometer be place
- permanently mounted where heat stress may exist
- temp. mount at temp. work sites
- properly shielded from radiant heat levels or influencing factors
dry bulb accuracy must be within ____ *F of _________. if not then what?
5 WBGT
-reposition thermometer
Dry bulb should be read every ___ hours for ___ spaces in DB temp does not exceed _____*F
4 hours
manned
85*F
DB temp must be read and recorded hourly if
heat casualties
exceed 85*F
temperatures exceeding ___-*F and stay times _____ should be circled in red
100*F
less than watch period
dry bulb sensor measures
ambient temp
wet bulb temperature neasures
humidity
globe temp measures
radiant heat
WBGT Index measures
weighted average of DB, WB and GT
what is the WBGT INDEX calculation
(.1xDB) + (.7xWB) + (.2xGT). MUST NOT DIFFER MORE THAN .2
REQUIRED MONITORING CONDITIONS PHEL I-III
- WATCH ROTATION IS 4 HOURS OR LESS AND DB IS => 100*F
- WATCH ROTATION IS GREATER THAN 4 HOURS AND DB IS = OR GREATER THAN 90*F
REQUIRED MONITORING CONDITIONS PHEL IV-VI
DB = OR > THAN 85*F
REQUIRED MONITORING CONDITIONS
- HEAT CASUALTY OCCURS
- DRILL SET THAT EXCEEDS 3 HOURS
- DIRECTED BY CO
FOLLOW ON SURVEYS ARE CONDUCTED IF
DB INCREASE BY 5*F
HOW TO USE RSS-220 WBGT METER
WAIT 5 MINUTES FOR INITIAL READING AND 3 MINUTES FOR SUBSEQUENT READINGS
HOLD AT CHEST LEVEL, 1 FT AWAY FOM BODY
HOW USE QUESTemp 48N
wait 10 min after turning on
set 5 min at each site before reading
hold at chest level, 18 inch away
what does AHSS stand for
Automated Heat Stress System
if ship has AHSS must have on board
a least 2 portable WBGT meters
