10-8 Change A
U.S. Navy Diving Manual—Volume 2
10-8.1.2
Bottles. Scuba bottles designated for
use with NITROX should be oxygen
cleaned and maintained to that level.
The bottles should have a NITROX la-
bel in large yellow letters on a green
background. Once a bottle is cleaned
and designated for NITROX diving, it
should not be used for any other type of
diving (Figure 10-2).
10-8.2
General. All high-pressure flasks,
scuba cylinders, and all high-pressure
NITROX charging equipment that
comes in contact with 100 percent oxy-
gen during NITROX diving, mixing, or
charging evolutions must be cleaned
and maintained for NITROX service in
accordance with the current MIL-STD-
1330 series.
10-8.3
Surface-Supplied NITROX Diving. Surface-supplied NITROX diving systems
must be modified to make them compatible with the higher percentage of oxygen
found in NITROX mixtures. A request to convert the system to NITROX must be
forwarded to NAVSEA 00C for review and approval. The request must be accom-
panied by the proposed changes to the Pre-survey Outline Booklet (PSOB)
permitting system use with NITROX. Once the system is designated for NITROX,
it shall be labeled NITROX with large yellow letters on a green background. MIL-
STD-1330D outlines the cleanliness requirements to which a surface-supplied
NITROX system must be maintained.
Once a system has been cleaned and designated for NITROX use, only air meeting
the requirements of Table 10-2 shall be used to charge the system gas flasks. Air
diving, using a NITROX designated system, is authorized if the air meets the
purity requirements of Table 10-2.
The EGS used in surface-supplied NITROX diving shall be filled with the same
mixture that is being supplied to the diver ± 0.5 percent.
10-9
EQUIPMENT CLEANLINESS
Cleanliness and the procedures used to obtain cleanliness are a concern with
NITROX systems. MIL-STD-1330 is applicable to anything with an oxygen level
higher than 25 percent by volume. Therefore, MIL-STD-1330 must be followed
when dealing with NITROX systems. Personnel involved in the maintenance and
repair of NITROX equipment shall complete an oxygen clean worker course, as
described in MIL-STD-1330. Even with oxygen levels of 25 to 40 percent, there is
still a greater risk of fire than with compressed air. Materials that would not
Figure 10-2. NITROX Scuba Bottle
Markings.
Yellow Lettering
Yellow
Yellow
Green
