Air Decompression Case Study

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1. What are the 6 tables used for air decompression? 1) No-Decompression limits & Reptet Group Designatoin Table for No"D" Air Dives. 2) Air Decompression Table. 3)Residual Nitrogen. Timetables for Repet Air Dives. …show more content…
State the RNT exception rule.

In some cases, the residual nitrogen time may be longer than needed to provide adequate decompression on the repetitive dive. This situation is most likely to occur when the surface interval between the dives is short. After determining the decompression requirement for the repetitive dive the diver should recalculate the requirement by summing the bottom times of the two dives and taking the deepest depth. If the resultant table and schedule produces a longer no-decompression time or a shorter decompression time, the table and schedule with the lesser decompression obligation may be used.

12. Explain the “Safe Way Out”
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Compress the diver to the deepest depth he can attain initially. This will usually be less than 20 fsw Begin oxygen breathing at that depth. Continue attempts to gradually compress the diver deeper. Double the number of chamber oxygen periods indicated in the table and have the diver take these periods at whatever depth he is able to attain. Oxygen time starts when the diver initially goes on oxygen. Interrupt oxygen breathing every 60 minutes with a 15 minute air break. The air break does not count toward the total oxygen time. Upon completion of the oxygen breathing periods, surface the diver at 30 fsw/min. Carefully observe the diver post-dive for the onset of decompression sickness.

13. Explain the protocol for a surface decompression dive in which the surface interval exceeds 7 minutes.

If the surface interval is greater than 7 minutes, continue compression to a depth of 60 fsw. Treat the divers on a Treatment Table 5 if the original schedule required 2 or fewer oxygen periods in the chamber. Treat the divers on Treatment Table 6 f the original schedule required 2.5 or more oxygen periods in the chamber.

14. What is the procedure when your divers reach their first stop in 3::16, and they were supposed to get there in 1::14 and their time to 50’ was under a minute late?

Add :03 to first stop

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