Air Sup Flashcards
(17 cards)
If Air Deco Table does not list a repet group for a dive…
No repet dives are permitted below 20fsw.
The diver must have an 18-hour SI before making another dive deeper than 20fsw.
What are the 3 types of contaminants divers can expect to encounter?
Chemical, biological, and radiological.
Warm and Cold Water diving limits
Great than 88 degrees.
37 degrees and colder.
Variation in rate of ascent:
If divers arrive early at the first decompression stop…
Begin timing the first stop when the required travel time has been completed.
IF the first stop is an oxygen stop: shift the divers to oxygen upon arrival at the stop. Begin stop time when the divers are confirmed on O2 AND the required travel time has been completed.
Variation in rate of ascent:
Delay greater than :01, and deeper than 50fsw.
Round up delay time
Add it to bottom time
Recompute deco
If change in schedule is required, and the new schedule calls for deco stop deeper than diver’s current depth, perform any missed deeper stop at diver’s current depth. DONT GO DEEPER.
Variation in rate of ascent:
Delay greater than :01, shallower than 50fsw.
Round the delay time up
Add delay time to diver’s first decompression stop.
Variation in rate of ascent:
Delay in leaving a stop or between Deco stop: Delay greater than :01 leaving an air stop or between air stops deeper than 50fsw.
Add delay to bottom time and recalculate required deco.
If new schedule is required, pick up the new schedule at the present or next stop. IGNORE ANY MISSED STOPS OR TIME DEEPER THAN THE DEPTH AT WHICH THE DELAY OCCURRED.
Variation in rate of ascent:
Delay in leaving a stop or between Deco stop: Delay greater than 01 minute leaving an air stop shallower than 50fsw.
Disregard delay.
Resume normal schedule.
Variation in rate of ascent:
Delay in leaving a stop or between O2 Deco stop (30/20):
Subtract any delay leaving 30’ O2 stop, or any delay during travel, from the 20’ stop time. If the delay causes total time on O2 time to exceed :30, shift the diver to air at the :30 mark.
Variation in rate of ascent:
Delay in leaving 20’ O2 Deco stop:
Disregard, just don’t leave the diver on O2 for longer than 30min. Shift diver to air and continue on air until reach surface.
EP:
In-Water DCS
Dispatch standby, continue to deco unaffected diver normally.
Switch to 100% O2 if available.
Drop the diver 10fsw, if significant relief is not obtained descend another 10fsw. (No deeper than 40fsw if diver is on O2.)
Remain at treatment depth for at least :30.
If diver is on air, resume decompression from treatment depth by multiplying subsequent air/O2 stops by 1.5.
If Recompression went deeper than the depth of the first stop on deco schedule: insert intervening stops in 10fsw increments between treatment depth and original first stop depth equal to 1.5 times the original first stop time.
If the diver is undergoing treatment on O2 at 40fsw, return to surface by multiplying 30/20fsw O2 stop times by 1.5. If original schedule did not call for a 30fsw O2 stop insert one with an equal stop time to 20fsw stop.
If the diver is undergoing treatment on O2 at 30fsw, return to surface by multiplying 20fsw O2 stop time by 1.5.
If the diver is symptom-free upon surfacing, place diver on O2, transport to chamber and treat on TT5. (May be waived if chamber isn’t available in a reasonable distance.)
If the diver is NOT symptom-free upon surfacing, transport the diver to the chamber and TT6.
If a Level I chamber is available, Dive Sup may elect to forego in-water recompression and surface for treatment OR surface after :30 to relieve symptoms and then surface for treatment.
After completing recompression treatment, observe the diver for at least 6 hours. If any symptoms recur, treat as a recurrence of Type II symptoms.
EP:
In-Water DCS
Diver CANNOT remain in the water.
Surface the diver at the proper rate.
If no chamber available, transport to chamber.
If a level I chamber is available, compress to 60fsw and if significant relief is obtained in the first O2 period come out on a TT6. If not press to depth of relief NTE 165 and begin TT6A.
EP:
Bottom time in excess of table.
Contact NEDU
If unable to contact NEDU, use the US Navy Thalmann Algorithm Dive Planner to computer deco requirement.
Read down to deeper depth in Air Deco until a depth is found that has a schedule that is equal to or longer than the bottom time.
EP:
Loss of O2 Supply in the water.
If the diver cannot be shifted to O2 at 30/20fsw.
Have diver continue to breath air while problem is investigated.
If O2 is recovered, ventilate and resume. Consider time on air dead time.
If problem cannot be corrected, initiate surface decompression or continue on air.
If the problem cannot be correct and a recompression chamber is not available: Compute remaining stop time on air at the depth of the loss by multiplying the remaining stop time on O2 by the ration of “air-to-O2.”
EP: Contamination of O2 Supply with Air.
Have diver monitor EGS pressure periodically to ensure no drop in pressure.
If the operator discovers improper console line-up: Align it, ventilate for 20sec, restart O2 time.
EP:
CNS O2 Toxicity on Ascent
(Non-convulsive)
If recompression chamber is available, initiate SurDO2.
If chamber is not available AND event occurs at 30fsw: bring divers up 10fsw, shift to air during travel. Ventilate divers (beginning with affected diver) once you reach stop.
Complete decompression stop on air at 20fsw.
Multiply missed stop time on O2 at 30fsw by the ratio of air to O2 to obtain equivalent missed air time.
Add this to 20fsw stop air time shown on Deco table.
If chamber is not available AND event occurs at 20fsw: shift consile to air, ventilate both divers (affected diver first) and complete the decompression at 20fsw using the ratio solution.
EP:
CNS O2 Toxicity on Ascent
(Convulsion)
Launch STBY!
Shift both divers to air.
Have unaffected diver ventilate himself and then ventilate the stricken diver.
Hold the divers at depth until tonic-clonic phase of convulsion has subsided.
Have the dive partner/stby ascertain whether diver is breathing. (If not breathing, position head so airway is open)
Once diver is stable and breathing, and chamber is available, initiate SurDO2.
If no chamber, continue to decompress on air.
If diver is not breathing or cannot confirm: leave unaffected diver at deco stop, surface affected diver and stby at 30fpm maintaining an open airway. Once on surface initiate BLS and recompress to treat for AGE.
