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If the hanging dry bulb and WBGT are different by 5 degrees or more what action should be taken?
Hanging thermometer should be re-calibrated, relocated or replaced
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What are the requirements for the positioning of dry bulb thermometers?
Hung with non-conductive material 2 feet from vent duct opening
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Who can authorize extension of safe stay times?
C.O.
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When is Heat Stress Survey required?
- At 90 deg for watches <4 hours,
- at 100 deg for watches >4 hours,
- prior to drill sets over 3 hours,
- after a heat stress casualty, whenever ordered.
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Which curves apply t Green Bay?
- 1-4 for work,
- 1-2 for watches,
- PHEL 5 for sculleries.
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What is the WBGT?
A Wet Bulb Globe Temperature is a handheld meter used for manual heat stress surveys.
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What are the contributors to heat?
- Water in the bilge,
- missing or torn lagging,
- fumes/stack gases.
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When is a follow on survey required?
After a 5 degree change in temperature, either higher or lower.
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What is AHSS?
Automatic Heat Stress System
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What is the definition of manned space?
Spaces shall be considered manned if a roving patrol or system monitor frequents the spaces at least every 60 minutes and inspects the space for fire, flooding or sabotage
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What is the reference for heat stress?
5100.19E
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When is a survey required?
- When ordered
- When a heat stress casualty occurs
- Watches are 4 hours or less and the DB is 100 deg F
- Watches are greater than 4 hours and the DB temp is 90 deg F
- Wthe DB temp is 85 deg F in the scullery
- Prior to Engineering Casualty control drills that expect to last longer than 3 hours..
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What will trigger a repeat/follow-on survey?
- The DB changes 5 deg F up/down and would cause the stay time to increase/decrease.
- The WB changes 3 deg F up/down.
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What does PHEL stand for?
Physiological Heat Exposure Limit
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What is a localized survey?
- A survey done in a space due to special circumstances.
- For example, the EOOW can order a heat stress survey for a space known for poor ventilation and high temperatures that is scheduled for multiple hours of work.
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What are symptoms of heat stress and heat stroke?
- Heat stress - pupils dilated, cold/wet/clammy skin, sweat, skin rash, reported tiredness/dizziness
- Heat stroke - pupils constricted, dry/pale skin
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What equipment/space factors contribute to heat stress?
- poor ventilation
- water/liquids in bilges
- lagging missing on pipes
- exhaust leaks
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What factors related to the watch stander contribute to heat stress?
- poor hydration
- poor athletic ability
- clothing
- poor eating habits
- lack of adequate rest
- consumption of coffee/energy drinks.
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How do stack gases impact stay time?
Stack gases are fuel combustion gases whose negative physiological effects are exacerbated by heat stress.
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What to do if stack gases are prevalent in a space?
Take the calculated stay time and divide it by 3 for the updated stay time.
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What are symptoms of stack gases having an effect on an individual?
- Tingling sensation on the nose, fingers, toes, tip of the tongue; eyes water/burn; feel dizzy
- difficulty breathing
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How is recovery time determined for watch standers?
- Whichever of these two times is less equals the recovery time before reentry:
- 4 hours or
- exposure time multiplied by 2.
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What is the max temp difference between manual calc and metered WBGT?
.2
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What does PHEL stand for?
Physical Heat Exposure Limit
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What are the symptoms of Heat Exhaustion and heat stroke?
?
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What instruction and Chapter covers heat stress?
5100.19F, B2
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What is the max temp difference between the hanging dry bulb and metered dry bulb?
5
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What is the proper way of mounting a hanging dry bulb?
2 feet from the vent ducting with a non-conductive material
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Who can extend stay times?
CO
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How many PHEL curves are there and which do we normally use?
- I Normal
- II Non-routing
- III Drills
- IV V Heavy workload
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When conducting a survey how long must you wait before taking first reading and how long between watch stations and why?
?
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What reading is used to conduct the manual calculation?
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