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U.S. Navy Diving Manual—Volume 4
Table 17-8a. Repetitive Dive Procedures for Various Gas Mediums.
WARNING
No repetitive dives are authorized after an
emergency procedure requiring a shift to the EBS.
Selection of Repetitive Procedures for Various Gas Mediums
Previous Breathing Medium
(Refer to Notes 1, 2, and 3)
Current Breathing Medium
Procedure from Table 17-8b
N2O2
N2O2
A
Air
N2O2
B
N2O2
Air
C
HeO2
HeO2
D
HeO2
Air
E
Air
HeO2
F
HeO2
N2O2
G
N2O2
HeO2
H
Notes:
1.
If a breathing medium containing helium was breathed at any time during the 12-hour period immediately preceding a
dive, use HeO2 as the previous breathing medium.
2.
If 100 percent oxygen rebreathers are used on a dive in conjunction with other breathing gases, treat that portion of the
dive as if 0.7 ATA O2 in N2 was breathed.
3.
If both air and 0.7 ATA O2 in N2 are breathed during a dive, treat the entire dive as an air dive. If the 0.7 ata O2 in N2 is
breathed at depths 80 fsw or deeper, add the following correction factors to the maximum depth when selecting the
appropriate air table.
Maximum Depth on N2O2
Correction Factor
Not exceeding 80 FSW
0
81-99
Plus 5
100-119
Plus 10
120-139
Plus 15
140-150
Plus 20
