8-6 Change A
U.S. Navy Diving Manual—Volume 2
18 minutes at 10 fsw
Ascent time: 5 minutes (rounded up from 4 minutes 20 seconds) from 130 fsw
to the surface at 30 feet per minute.
4.
Calculate the air remaining at the completion of the dive to see if there is
sufficient air in the air supply flasks to make the dive.
scf remaining = scf available – scf required
=
5609 scf – 804 scf
=
4805 scf
More than sufficient air is available in the air supply flasks to make this dive.
NOTE
Planned air usage estimates will vary from actual air usage. The air
requirements for a standby diver must also be taken into account for all
diving operations. The Diving Supervisor must note initial volume/pres-
sure and continually monitor consumption throughout dive. If actual
consumption exceeds planned consumption, the Diving Supervisor may
be required to curtail the dive in order to ensure there is adequate air
remaining in the primary air supply to complete decompression.
scf required
20
33
+
33
------------------
1.4
3
3
=
20.24
=
scf required
10
33
+
33
------------------
1.4
3
18
=
98.51 scf
=
average depth
130
2
---------
65 fsw
=
=
scf required
65
33
+
33
------------------
1.4
3
5
=
62.36 scf
=
Total air required
622.36
20.24
98.51
62.36
+
+
+
=
803.48 scf (round to 804 scf)
=
