US NAVY DIVE MANUAL CHAPTER 9 AIR DECOMPRESSION

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US NAVY DIVE MANUAL CHAPTER 9 AIR DECOMPRESSION
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US NAVY DIVE MANUAL CHAPTER AIR DECOMPRESSION
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US NAVY DIVE MANUAL CHAPTER 9 AIR DECOMPRESSION
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  1. Table 9‑3.
    Management of Asymptomatic Omitted Decompression
    No-Decompression Stops Required
    Observe on the surface for one hour
  2. Table 9‑3.
    Management of Asymptomatic Omitted Decompression
    20-30 Decompression Stops Required
    Less than 1 minute surface interval
    Return to depth of stop. Increase stop time by 1 min. Resume decompression according to original schedule.
  3. Table 9‑3.
    Management of Asymptomatic Omitted Decompression
    20-30 Decompression Stops Required
    Surface interval between 1-7 minutes
    Chamber available
    Use Surface Decompression Procedure

    For surface decompression, surface interval is the time from leaving the stop to arriving at depth in the chamber.

    For surface intervals greater than 5 minutes but less than or equal to 7 minutes, increase the oxygen time at 50 fsw from 15 to 30 minutes.
  4. Table 9‑3.
    Management of Asymptomatic Omitted Decompression
    20-30 Decompression Stops Required
    Surface interval over 7 minutes
    Chamber available
    • Treatment Table 5 if 2 or less O2 periods 
    • Treatment Table 6 if 2.5 or more O2periods
  5. Table 9‑3.
    Management of Asymptomatic Omitted Decompression
    20-30 Decompression Stops Required
    Surface interval more than 1 minute
    No Chamber available
    Return to depth of stop. Multiply 30 and/or 20 fsw air  or O2 stop times by 1.5.

    Using a recompression chamber is strongly preferred over in-water recompression for returning a diver to pressure. Compress to depth as fast as possible not to exceed 100 fsw/min
  6. Table 9‑3.
    Management of Asymptomatic Omitted Decompression
    40-50 Decompression Stops Required
    Any Surface interval 
    Chamber available
    Treatment Table 6
  7. Table 9‑3.
    Management of Asymptomatic Omitted Decompression 
    60 or deeper Decompression Stops Required
    Any Surface interval 
    Chamber available
    Treatment Table 6A
  8. Table 9‑3. Management of Asymptomatic Omitted Decompression
    40 or deeper Decompression Stops Required
    Any Surface interval 
    No Chamber available
    Descend to depth of first stop. Follow the schedule to 30 fsw. Switch to O2 at 30 fsw if available. Multiply 30 and 20 fsw air or O2 stops by 1.5
  9. 9-12.1
    Bottom Time in Excess of the Table
    • If the Navy Experimental Diving Unit cannot be contacted in time, take the following action:
    • 1. If available, use the U.S. Navy Thalmann Algorithm Dive Planner to compute the decompression requirement.
    • 2. Read down to deeper depths in the Air Decompression Table until a depth is found that has a schedule that is equal to or longer than the bottom time.
  10. 9-12.2
    Loss of Oxygen Supply in the Water
    If the diver cannot be shifted to oxygen at 30 or 20 fsw:
    • 1. Stay on air while the problem is investigated.
    • 2. If the problem can be corrected quickly, ventilate the diver, consider any time spent on air as dead time. 
    • 3. If the problem cannot be corrected, initiate surface decompression or continue decompression in the water on air.
  11. 9-12.2
    Loss of Oxygen Supply in the Water
    If the oxygen supply is lost during the 30 or 20-fsw water stops after the diver has shifted to oxygen
    • Shift the diver back to air.
    • If the problem can be corrected quickly, re-ventilate the diver with oxygen and resume the schedule at the point of interruption. 
    • If the problem cannot be corrected and a recompression chamber is not available on the dive station, continue decompression on air in the water.
  12. 9-12.3
    Contamination of Oxygen Supply with Air
    • 1. Align the ORCA properly.
    • 2. Re-ventilate each diver with oxygen for 20 seconds.
    • 3. Restart oxygen time. Consider any time spent on contaminated oxygen as dead time.
  13. 9-12.4
    CNS Oxygen Toxicity Symptoms (Non-convulsive) at 30 or 20 fsw Water Stop
    Recompression chamber is available
    • Initiate surface decompression.
    • Shift the console to air during travel to the surface.
    • Compute the number of chamber oxygen periods

    (multiply the remaining oxygen time at the stops by 1.1)
  14. 9-12.4
    CNS Oxygen Toxicity Symptoms (Non-convulsive) at 30 Water Stop
    Recompression chamber is not available
    • Bring the divers up 10 fsw
    • Shift the console while traveling to 20 fsw. Ventilate the affected diver first. 
    • Multiply the missed stop time on oxygen at 30 fsw by the ratio of the air to oxygen stop time at 30 fsw to obtain the equivalent missed air time at 30 fsw.
    • Add this time to the 20-fsw air stop time shown in the Air Decompression Table.
  15. 9-12.4
    CNS Oxygen Toxicity Symptoms (Non-convulsive) at 20 Water Stop
    Recompression chamber is available
    • Shift the console to air
    • Ventilate affected diver first
    • Compute the remaining stop time on air at 20 fsw by multiplying the remaining stop time on oxygen at 20 fsw by the ratio of the air stop time to the oxygen time at 20 fsw.
  16. 9-12.5
    Oxygen Convulsion at the 30- or 20-fsw Water Stops
    • 1. Shift both divers to air 
    • 2. Vent unaffected diver first.
    • 3. If only one diver is in the water, launch the standby diver
    • 4. Hold the divers at depth until the convulsion has subsided.
    • 5. Check for breathing.
    • 6. If the diver appears not to be breathing,  attempt to reposition the head to open the airway.
    • 7. If breathing, hold him at depth until stable, then surface decompress. 
    • 8. If surface decompression is not feasible, continue decompression on air in the water. 
    • 9. If it is not possible to verify that the affected diver is breathing, surface the affected diver, administer ACLS and treat for arterial gas embolism
  17. 9-12.6
    Surface Interval Greater than 5 Minutes
    SI is between 5-7, increase the time on oxygen at 50 fsw from 15 to 30 minutes

    • If the surface interval is greater than 7 minutes:
    • TT5 if 2 or fewer O2 periods
    • TT6 if 2.5 or more O2 periods
  18. 9-12.6
    Cannot get to 50FSW for Surface Decompression
    • Press the diver to equivalent water stop
    • Double the number of O2 periods
    • 60mins on 02, 15 mins on air
    • No repet diving authorized
  19. 9-12.7
    Decompression Sickness During the Surface Interval
    Type I sx resolves in :15 at 50FSW, stay at 50FSW for a total of :30

    Type I sx  that do not resolve in:15 at 50FSW, Sart TT according to number of O2 periods

    Type II - TT6
  20. Table 9‑2.
    Management of Extended Surface Interval and Type I Decompression Sickness during the Surface Interval
    SI between 5-7 or Type I sx that resolves in :15 add :15 to 50FSW stop time

    • More than :5 SI and any DCS sx.
    • TT5 or TT6 according to O2 periods
  21. 9-12.8
    Loss of Oxygen Supply in the Chamber
    • Temp: count as dead time
    • Perm: if available use 50/50 double 02 times, if air only determine air/o2 ratio and allocate for both
    • Allocate: At 40FSW; 10% at 40, 20% at 30FSW and 70% at 20FSW
    • At 30FSW; 30% at 30FSW ad 70% at 20FSW
  22. Table 9‑1
    Pneumofathometer Correction Factors
    • 000-100 fsw +1 fsw
    • 101-200 fsw +2 fsw
    • 201-300 fsw +4 fsw
    • 301-400 fsw +7 fsw
  23. 9-8.2.1
    Procedures for Shifting to 100% Oxygen at 30 or 20 fsw
    • 1. Align 100% oxygen to the diver.
    • 2. Ventilate each diver for 20 seconds. Divers may be vented simultaneously or sequentially.
    • 3. Verify that the oxygen monitoring device on the ORCA or FMGS
  24. 9-8.2.2
    Air Breaks at 30 and 20 fsw
    At the 30 fsw and 20 fsw water stops, the diver breathes oxygen for 30 min periods separated by 5 min air breaks

    If the final oxygen period is 35 minutes or less, a final air break at the 30-min mark is not required

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