Heat Stress

Question 1

Prevention and Treatment of Heat and Cold Stress Injuries

Answer 1

NMCPHC-TM-OEM 6260.6

Question 2

Who is responsible for providing recommendations to the COC regarding heat stress?

Answer 2

IDC

Question 3

Heat Stress definition

Answer 3

any combination of air temperature, thermal radiation, humidity, air flow and work load which stresses the body as it attempts to regulate temperature

Question 4

Thermal radiation

Answer 4

sun
heat source (incinerator, engines, generators, dryers)

Question 5

ventilation - air flow

Answer 5

forced air systems (spot cooling)

forced exhaust systems (red devil blowers)

Question 6

Humidity - moisture in the air

Answer 6

steam leaks
bilge water
condensation

Question 7

Air/Sea water temperature

Answer 7

Intake valves that allow sea water/outside air to be utilized for cooling for shipboard equipment 
refrigeration units 
engines
generators 
evaporators for fresh water consumption

Question 8

Acclimatization

Answer 8

act of becoming accustomed to temperature or new environment
usually occurs within 3 weeks

Question 9

Personal factors that affect heat stress

Answer 9

past exposure 
G6PD or Sickle Cell
Dehydration 
Medication 
Alcohol Intake 
Lack of sleep 
Drugs

Question 10

Common spaces for heat stress

Answer 10

flight deck
laundries
machinery spaces 
sculleries 
incinerators

Question 11

contributors to heat stress

Answer 11

steam and water leaks 
boiler air casing leaks
missing/deteriorated thermal insulation 
ventilation deficiencies 
weather conditions 
arduous ops

Question 12

Physiological Heat Exposure Limit (PHEL)

Answer 12

set of 6 curves that compare the WBGT index to the degree of effort in work

Question 13

Routing operations

Answer 13

light work including sweeping down, painting, cleaning lube oil strainers

Question 14

Non-Routine operations

Answer 14

next higher level PHEL

increase in normal watch stander work rate and minor equipment casualty

Question 15

ECC Exercises

Answer 15

Evacuation Control Center Drills

Question 16

Heavy Work Load

Answer 16

replacing large valves, cleaning lube oil dumps, disassembly reassembly of large equipment

Question 17

Stay Time

Answer 17

maximum allowable time personnel may work in heat stress conditions at a given workload

Question 18

Recovery Time

Answer 18

minimum of twice the stay time as determined by the PHEL chart or 4 hours, whichever is shorter

Question 19

Fuel Combustion Gases

Answer 19

combustion gases that accumulate un a space due to inadequate ventilation

Question 20

Signs and symptoms of Stack Gas

Answer 20

Watery eyes
dyspnea
tingling or numbness of the tip of the tongue, tip of the nose, finer tups or toes
Mild sensation of alcohol intoxication

Question 21

Action for Stack Gas

Answer 21

reduce exposure limits if two or more sx are detected

determine new PHEL or divide stay time by 3