Mixed Gas Flashcards
Normal operational Depth and exposure limit for SSD
300FSW :30
Repet Diving with Mixed gas wait times
12 hours before second dive, 18 hours after DECO dive
Break after 4 consecutive days diving
1 day
50/50 mix depth and percentage
90-40 FSW, 49-51% O/2
HEOX instrument accuracy
+- .5%
HEOX EGS mix
Same as bottom unless less than 16%02 then range 15-17%
Loss of HeO2 on the bottom
Shift to EGS and abort the dive
Shift to 50% and 50% at 90 feet
If EGS depletes prior to 90 feet shift to air
Exceeding five minutes when shifting to bottom next
Bottom time starts at five minute mark
Aborting a dive during decent
If at < 100 feet, Another dive may be performed and add the bottom times
If at > 100 feet, Repetitive diving is not allowed
Light headedness and dizzy on the bottom
Stop work
ventilate check O2 level tank n bank
no improvement shift to vent
no improvement consider EGS
abort
Unconscious diver on bottom
Check breathing, tank and bank, O2 level
Buddy okay, vent affected diver, smell gas in standby hat
Not breathing reposition head
Abort to first stop at 30 feet, reassess
Bottom time exceeds table
Call EDU for advice
If no advice, use the :120 schedule for deepest depth attained
Do 30 minutes on 02 at 40 feet
Surface at 40 feet per min, do TT 6 with Max extensions
Loss of 50\50
Temporary
Shift to air, correct problem
Shift back, time on air counts
Permanent Shift to air Shift to 02 @ 50 feet Do not exceed 16 minutes on 02 at 50 feet Travel to 40 feet surDO2 after 40' stop
Delay to first stop
Less then one minute ignore
Greater than one minute round to the next whole minute and to BT recompute T/S
Perform any missed deeper stops at divers current depth do not go deeper
Delay leaving stop greater than 90 feet
Less than one minute ignore
Greater than one minute delay time to bottom time
Pick new schedule at present or current stop
If delay occurs between stops restart current stop time at completion of delay
Ignore any missed stops or time deeper than delay occurred