DCIEM hypothetical questions - no tables Flashcards
- Using DCIEM procedures, when is a dive no longer called repetitive?
when RF reaches 1.0
what is bottom time?
The total elapsed time from when a diver leaves the surface to the time (next whole minute) at which ascent is commenced, measured in minutes
what is RF?
A figure, used for repetitive diving, determined by the repetitive group and the length of the surface interval after a dive.
what is a surface interval?
For repetitive diving, the calculated bottom time for decompression purposes taking into consideration the residual nitrogen from the previous dive/s.
- List the DCIEM procedure for omitted decompression when a recompression chamber is not available on site. (Allow ~3 minutes).
Where a compression chamber is not immediately available to a diver having omitted decompression, the preferred action is to get the diver to a compression chamber for treatment. The diver should receive 100% O2 by double seal oronasal mask en route to the compression chamber. However, the Supervisor has the following options if the situation warrants it (i.e. the diver can get back into the water within 7 ½ minutes with sufficient air to do the required stops, conditions are suitable, and the diver has no DCS symptoms).
a). Return the diver to the next deeper stop than where the omission occurred and repeat the omitted stop. Then continue decompression with the original schedule (i.e. complete all missed stops); or
b). If no deeper stop was required, spend the time of the first stop at the next deeper stop and then complete the total schedule required at the missed stop as well.
- What is the recommended ascent/descent rate for the DCIEM tables?
Descend and ascend at 18 +/- 3m/min or slower
ascend to the indicated stops in DCIEM tables
how much time is there between dives for you not to be considered repetitive diving?
18 hours
