(2024 Exam) USN Dive Man Mixed Gas Flashcards
Bottom time in excess of table?
1) “D” using :120 schedule for deepest depth attained
2) Shift to O2 @ 40fsw
3) Sur Diver after :30 O2 @ 40fsw.
4) Compress to 60 NTE 100fsw/min
5) Treat on TT6 w/ max extensions
Loss of Helium-Oxygen Supply on the Bottom?
- Shift to (EGS).
- Abort the dive.
- Stay on EGS until 90 fsw.
- At 90 fsw, shift to 50/50 and complete “D” as sched.
- If the EGS becomes exhausted before 90 fsw is reached, shift the diver to air, complete decompression to 90 fsw, shift the diver to 50/50, and continue the “D” as planned.
The minimum oxygen percentage allowed in the mixture is ___% for depths to 200 fsw and ___% for depths in excess of 200 fsw.
to 200fsw- 14%
Excess of 200fsw- 10%
Instruments used to measure oxygen content in helium-oxygen mixtures shall be accurate to___%?
0.5 %
To what depth are you allowed to abort a mixed gas dive? Are you allowed to make another dive after?
100 fsw and shallower.
Yes, dives aborted deeper than 100fsw may not.
What is normal operational limit for SS mixed gas dives?
300fsw for :30.
What is the Maximum working limit for SS Mixed Gas Dives?
380fsw.
Following a “no-decompression dive” the diver must wait _____hrs before making a second dive.
12 hours
Following a decompression dive, the diver must wait ____hrs?
18 hours.
I diver should take a one day break after ____ consecutive days of mixed gas diving?
four
What is the minnimum manning for SS mixed gas dives for one and two Divers?
One Diver- 12
Two Divers- 14
Who is required to be formally trained (NDSTC) Sur Supplied Diver?
Divers, Timekeeper/recorder, Rack operator, Console Operator.
What % O2 shall the EGS be if the bottom mix is below 16%?
15 to 17%
When diving mixed gas in water below ___ degrees F keeping the diver warm is a life support consideration?
40 degrees.
Following a no-decompression dive, the diver must wait ___hrs and Following a decompression the diver must wait ____hrs before ascent to altitude.
No”D”-12 hours
D- 24 hours
