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
What are the requirements for the positioning of dry bulb thermometers?
Hung with non-conductive material 2 feet from vent duct opening
Who can authorize extension of safe stay times?
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.
Which curves apply t Green Bay?
- 1-4 for work,
- 1-2 for watches,
- PHEL 5 for sculleries.
What is the WBGT?
A Wet Bulb Globe Temperature is a handheld meter used for manual heat stress surveys.
What are the contributors to heat?
- Water in the bilge,
- missing or torn lagging,
- fumes/stack gases.
When is a follow on survey required?
After a 5 degree change in temperature, either higher or lower.
What is AHSS?
Automatic Heat Stress System
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
What is the reference for heat stress?
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..
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.
What does PHEL stand for?
Physiological Heat Exposure Limit
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.
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
What equipment/space factors contribute to heat stress?
- poor ventilation
- water/liquids in bilges
- lagging missing on pipes
- exhaust leaks
What factors related to the watch stander contribute to heat stress?
- poor hydration
- poor athletic ability
- poor eating habits
- lack of adequate rest
- consumption of coffee/energy drinks.
How do stack gases impact stay time?
Stack gases are fuel combustion gases whose negative physiological effects are exacerbated by heat stress.
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.
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
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.
What is the max temp difference between manual calc and metered WBGT?
What does PHEL stand for?
Physical Heat Exposure Limit
What are the symptoms of Heat Exhaustion and heat stroke?
What instruction and Chapter covers heat stress?
What is the max temp difference between the hanging dry bulb and metered dry bulb?
What is the proper way of mounting a hanging dry bulb?
2 feet from the vent ducting with a non-conductive material
Who can extend stay times?
How many PHEL curves are there and which do we normally use?
- I Normal
- II Non-routing
- III Drills
- IV V Heavy workload
When conducting a survey how long must you wait before taking first reading and how long between watch stations and why?
What reading is used to conduct the manual calculation?