Air SUP EP's Flashcards
Loss of O2 in Water
If cannot be shifted to O2 @ 30’-20’
Have diver breath air
Corrected quickly? Vent diver w/O2 ASAP when O2 restored. Any time on air is dead time. Remain on O2 @ stop for the full stop time.
If cannot be corrected, SurDO2 or in water deco on air. SI starts where you leave from, and ends 50’ in the chamber.
BT in Excess of Table
Contact NEDU
Use US Navy Thalmann Algorithm Dive Planner
Find a deco table until a depth is found with a Schedule equal to or longer than the BT
Loss of O2 in Water
During O2 stop @ 30’-20’ after diver already shifted to O2
Shift back to Air
Corrected quickly? Vent w/O2 and resume APOI.
If not corrected quickly & chamber available - SurDO2.
Remain O2 time X 1.1 / 30 = ? Round up to next half period
If not corrected & no chamber in-water Air deco.
Remain stop time X ratio of air stop to O2 time. Ex. 140/34=4.12(ratio) 10(remain) X 4.12 = 41.2 mins of Air
Contimination of O2 supply w/Air
Operator ensures proper line-up & O2 monitor indicates 100%
Have diver monitor EGS for pressure loss
If improperly lined up:
Align the ORCA properly
Re-vent for ::20
Restart O2 time
CNS O2 Toxic (non-convulsive) @ 30’ or 20’
Nausea is the most likely symptom
Chamber on station - SurDO2 compute chamber periods required
Chamber not on station & occurs @ 30’ - bring up 10’ & shift to Air
Ventilate when reached 20’
Compute & complete Air
Deco
No chamber - Occurs @ 20’
Shift console and ventilate
Compute & complete Air deco
Oxygen Convulsion @ 30’ or 20’ water stop
Shift to air
Unaffected diver vent first then affected diver
Only one diver in water, launch standby to vent affected
Hold @ depth until tonic-clinic phase subsided
At the end ensure breathing
If not breathing position diver to head-up open airway position. Airway obstruction is most common reason for non breathing
If diver is breathing, hold him at depth until he’s stable then SurDO2
SurDO2 not feasible, continue deco on in water air
If cannot verify stricken diver is breathing leave unaffected diver at stop and compete deco. Surface affected diver 30 fpm. Standby maintains open airway
SurDO2 SI greater then 5 min
SI > :5 but < :7 add one half O2 period. From :15 to :30 @ 50’
Ascend during air break to 40’
:15 penalty is considered normal deco not an EP
SI > :7 compress to 60’
TT5 if original table required 2 or fewer O2 periods
TT6 if original table required 2.5 or more O2 periods
Loss of O2 in the Chamber
Remove bib, breath air
Loss is temp, return to O2, time
off O2 is dead
If O2 loss is perm, complete deco on 50% NE 50% O2 or air
50/50
2 X O2 time left = equivalent chamber deco time. Air breaks not required
Chamber Air
Chamber O2 time left X air stop/O2 ratio
Next, X that by .1/40 fsw - .2/30 fsw - .7/20 fsw
This gives you the required deco on chamber air
CNS O2 Toxic in Chamber
Remove O2, breath chamber air
:15 after sx subside, resume at POI
2nd SX or 1st Convulsion
- Remove mask
- sx subside ascend 10’ wait til tonic
- resume O2 @ shallower depth @ POI
3rd SX or 2nd Convulsion
-another sx after ascent - deco on chamber air and compute required time
No “D” stop required omitted “D”
(Ascent rate greater then 30 fpm
Neuro
Observe on surface for 1 hour
Hour complete conduct another Neuro
Omitted “D” stop @ 20’ or 30’
20 or 30 fsw
< :1
Return to depth of stop and increase :1
:1 to :7
Use sudO2 if aval add :15 if SI > :5
If no chamber return to depth of stop. X 30’/20’ air or O2 by 1.5
> :7
TT5 if 2 or less O2 periods owed
TT6 if more then 2 O2 periods owed
If no chamber return to depth of stop. X 30’/20’ air or O2 by 1.5
Deeper then 30’
TT6
No chamber - descend to sched depth, @ 30’ shift to O2 if aval. Compute deco by X the 30 and 20’ stop time (air or o2) by 1.5
DCS Diver Remaining in the Water
Consult DMO
Send standby
If affected dv is on air, switch to O2
Descend DV 10’. If not signif relief of sx, descend another 10’ not to exceed 40’ if the DV is on O2.
Remain at that depth for at least :30
If DV is on air: resume deco from treatment depth by X air or O2 stp times by 1.5. If treat depth deeper then original t/s stop depth, insert 10’ increments between to original point
If DV is on O2 @ 40’ or 30’ return to surface by X the 30’ and 20’ stop times by 1.5, respectfully
If DV surfaces sx free, place on O2, transport to chamber, TT5.
If DV is not sx free when surfacing, admin O2, transport to chamber, TT6.
If immediate chamber aval dive sup can elect to surdO2. However, treat any DCS as type II
Watch for 6 hrs. If reoccur, treat as recurrence of type II
