Heat Stress

Question 1

What manual is the Heat Stress Program under?

Answer 1

5100.19(series) vol 1 part 1 chapter B2

Question 2

What does PHEL stand for?

Answer 2

Physiological Heat Exposure Limit

Question 3

How many PHEL Curves are there?

Answer 3

6, ranging from light (PHEL Curve 1) to heavy work (PHEL Curve 6)

Question 4

Which PHEL Curve do we use?

Answer 4

It varies, inside the booth is PHEL Curve 1, while inside the space is usually PHEL Curve 2 and 3. The scullery can be a PHEL Curve 5 and during heavy work in the plant it could be a PHEL Curve 6.

Question 5

What does WBGT stand for?

Answer 5

Wet Bulb Globe Thermometer

Question 6

What is the WBGT?

Answer 6

An instrument combining the effects of the dry bulb, wet bulb, wet bulb and globe thermometers to produce an index number used in conjunction with the PHEL Chart to indicate allowable exposure times.

Question 7

What type of WBGT do we use?

Answer 7

Questemp 48N

Question 8

Define Dry Bulb (DB).

Answer 8

Air temperature as measured with a thermometer shielded from radiation

Question 9

Define Wet Bulb (WB).

Answer 9

The temperature is measured with an ordinary thermometer except a wet wick is fitted over the bulb and air flow passes over the wick. This is measuring the quantity of water vapor (humidity).

Question 10

Define Globe Thermometer.

Answer 10

Copper sphere painted flat black which contains a dry bulb thermometer which measures radiant heat.

Question 11

Define Psychrometer.

Answer 11

An instrument for measuring humidity utilizing a wet and dry thermometer.

Question 12

What does Time Weighted Mean (TWM)?

Answer 12

TWM is a math formula that is intended for use in especially hot environments where reduced stay times have been imposed on watch standers. If an air-conditioned booth or cooler space is available for personnel to spend time in the cooler climate and afford some relief from the heat in the space the TWM may be utilized maximizing time in space.

Question 13

What effect does stack gas have on a space and stay time?

Answer 13

It reduces stay time by 66% (2/3). Exposure limits must be reduced if at least 2 of the 4 following conditions exist:

Eyes watering and/or burning
Difficulty breathing
Tingling or numbness of the tip of the tongue, nose, fingertips and/or toes
Generalized sensation of mild intoxication without alcohol consumption in last 24 hours

Question 14

What is the difference between Heat Stroke and Heat Exhaustion?

Answer 14

Heat Stroke is hot and dry skin, constructed pupils, elevated blood pressure and temperature, reduced breathing.

Heat Exhaustion is classy and pale skin, dilated pupils, normal blood pressure and temperature, profuse respiration.

Question 15

What actions to take for a Heat Casualty?

Answer 15

Move person to a cool and relaxed environment with plenty of rest and fluids. If they’re collapsed, massage their extremities and elevate their feet.

Question 16

What actions to take for Heat Stroke Casualty?

Answer 16

Medical Emergency. Establish and maintain an airway. Immediate cooling, IV saline and glucose, hospitalization.

Question 17

What is the standard for hanging dry bulbs?

Answer 17

May be in or out of the ventilation air stream but must be hung at least 2 feet from any supply ventilation terminal/opening. Thermometers shall be hung with non-heat conducting materials and positioned to minimize the influence of local heat and cold sources.

Question 18

When SHALL the ship conduct a heat survey?

Answer 18

PHEL Curves 1-3 when watch/work length is 4 hours or less and the space is above 100 degrees DB. When watch/work length is greater than 4 hours and the space is above 90 degrees DB.
PHEL Curve 5 when SB is 85 degrees or above.
In any space that a heat injury occurs.
Prior to conducting Engineering Casualty Control (ECC) Drills if drill set exceeds 3 hours.
In any space the CO determines that a heat stress situation may occur.
As required by follow on surveys.