9-8 U.S. NAVY STANDARD AIR DECOMPRESSION TABLE

U.S. NAVY STANDARD AIR DECOMPRESSION TABLE

This manual combines the Standard Air Decompression Schedules and Exceptional Exposure Air Schedules into one table (see Table 9-5). To clearly distinguish between the standard (normal) and exceptional exposure decompression schedules, the exceptional exposure schedules have been printed in red.

NOTE

The Commanding Officer must have CNO approval to conduct planned exceptional exposure dives.

If the bottom time of a dive is less than the first bottom time listed for its depth, decompression is not required. The divers may ascend directly to the surface at a rate of 30 feet per minute (fpm). The repetitive group designation for a no-decompression dive is given in the Unlimited/No-Decompression Table. As noted in the Standard Air Decompression Table, there are no repetitive group designations for exceptional exposure dives. Repetitive dives are not permitted following an exceptional exposure dive.

TABLE 9-5 Required Surface Interval Before Ascent to Altitude After Diving.

Example

Divers complete a salvage dive to a depth of 140 fsw for 37 minutes. They were not unusually cold or fatigued during the dive. Determine the decompression schedule and the repetitive group designation at the end of the decompression.

Solution

Select the equal or next deeper depth and the equal or next longer bottom time

(

140

+

=

142 fsw

)

This would be the 150/40 schedule, repetitive group designator N (see Figure 9-6).

FIGURE 9-6 Completed Air Diving Chart.