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25 Cards in this Set

  • Front
  • Back
CNS O2 toxicity is not likely to occur at partial pressures below _____
1.3 ATA
What are the causes of CNS O2 Toxicity
1. Increased ppo2 with depth change
2.Increased exposure time
3.stress from exercise
4.CO2 build up
5.individual susceptablity
What is the clearest warning sign of CNS o2 Tox.
twitching
What piece of equipment is essential for safe closed circuit diving
buddy lines
where should you position yourself when dealing with a convulsing diver
behind the diver
when is the diver at the greatest risk of getting hypoxia
on the surface
What is the primary cause of hypoxia in the Mk 25
inadequate/incorrect purge of the breathing bag.
How are chemical injuries best prevented.
by prefoming a careful dip test during pre dive set up

preforming a leak check before leaving the surface
What is middle ear oxygen absorbtion syndrome?
negative pressure that develops in the middle ear following a long O2 dive
Symptoms of middle ear O2 absorbtion syndrome.
1.sense of pressure or mild discomfort in bolth ears
2.muffled hearing
3.moist crackling sensation in the ears
What are the single-depth oxygen exposure limits?
Normal: 25 fsw for 240 min
30 fsw for 80 min
35 fsw for 25 min
40 fsw for 15 min
Max: 50 fsw for 10 min

no excursion allowed when using single depth diving limits
Operational considerations
minimum manning 5
chase boat
buddy diver required
Is heavy work recommended for the Mk 25
no
What is the average gas consumption for MK 25
over bottom= 50 psi(3.4 bar)
gas consumption (normal) 15-17 psi per min
Canister duration is dependant on.
water temp
exercise rate
mesh size of absorbent
What type of canister is sofnolime 8-12 only approved for use in?
urethane canister
What are the limits for downward excursions when using the transit with excursion limits
21-40 fsw=15 minutes

41-50 fsw= 5 minutes
Are downward excursions allowed using single depth limits?
No
What is a off oxygen interval
The time a diver stops breathing O2 on one dive to the time a diver stars breathing O2 on a second dive
Which direction does the gas breathing loop flow on the re breather
clockwise
inhalation on the left exhalation on the right
What is a sucessive oxygen dive
one that follows a previous o2 dive after a off o2 interval of less than 2 hours
when would you not have to adjust for off oxygen exposure limits
if the off oxygen interval is greater than 2 hours
What is the maximum o2 time permitted with in 24 hours
4 hours (240 mins) max o2 time
The mixed gas to oxygen rule states that if a diver made a previous dive with a breathing gas of ___ ata or greater the previous exposure must be treated as a closed circuit O2 dive
1.0 ata or greater
what is the rule for flying after closed circuit o2 diving
flying is permitted after diving unless it was after a multiple uba profile