21-44
U.S. Navy Diving Manual—Volume 5
Treatment Table 7
1.
Table begins upon arrival at 60 feet. Arrival at 60 feet is
accomplished by initial treatment on Table 6, 6A or 4. If
initial treatment has progressed to a depth shallower than
60 feet, compress to 60 feet at 20 ft/min to begin Table 7.
2.
Maximum duration at 60 feet is unlimited. Remain at 60
feet a minimum of 12 hours unless overriding
circumstances dictate earlier decompression.
3.
Patient begins oxygen breathing periods at 60 feet.
Tender need breathe only chamber atmosphere
throughout. If oxygen breathing is interrupted, no
lengthening of the table is required.
4.
Minimum chamber O
2
concentration is 19 percent.
Maximum CO
2
concentration is 1.5 percent SEV (11.4
mmHg). Maximum chamber internal temperature is 85°F
(paragraph 21-5.6.5).
5.
Decompression starts with a 2-foot upward excursion
from 60 to 58 feet. Decompress with stops every 2 feet
for times shown in profile below. Ascent time between
stops is approximately 30 seconds. Stop time begins with
ascent from deeper to next shallower step. Stop at 4 feet
for 4 hours and then ascend to the surface at 1 ft/min.
6.
Ensure chamber life-support requirements can be met
before committing to a Treatment Table 7.
7.
A Diving Medical Officer shall be consulted before
committing to this treatment table.
Figure 21-11. Treatment Table 7.
Treatment Table 7 Depth/Time Profile
Time at Depth (hours)
16
32
36
6
60
40
20
4
0
Depth
(fsw)
Descent Rate
20 Ft/Min.
Ascent Rate = 2 Ft/Hr
(2 Ft every 60 min.)
Ascent Rate = 3 Ft/Hr
(2 Ft every 40 min.)
Ascent Rate = 1 Ft/Hr
(2 Ft every 120 min.)
Ascent Rate
1 Ft/Min.)
12 hrs minimun
No maximum limit
6 hrs
10 hrs
16 hrs
4 hrs
