13-6 Change A
U.S. Navy Diving Manual—Volume 3
deep as 950 fsw. With the exception of the demand regulator, it is functionally
identical to the UBA MK 21 MOD 1, which is used for air and mixed gas diving.
The regulator for the MK 21 MOD 0 helmet is the Ultraflow 500, which provides
improved breathing resistance and gas flow over the MK 21 MOD 1.
The UBA MK 22 MOD 0 is an open circuit, demand-regulated, band-mask
version of the UBA MK 21 MOD 0. It is used for the standby diver for saturation,
mixed gas diving at depths in excess of 300 fsw and as deep as 950 fsw. It is
provided with a hood and head harness instead of the helmet shell to present a
smaller profile for storage.
13-3.8
Operational Characteristics. Equipment operational characteristics are reviewed
in Table 13-2 and specific equipment information can be found in paragraph 13-8.
All diving equipment must be certified or authorized for Navy use. Authorized
equipment is listed in the NAVSEA/00C Authorized for Navy Use (ANU) list. For
proper operation and maintenance of U.S. Navy approved diving equipment, refer
to the appropriate equipment operation and maintenance manual.
13-3.9
Support Equipment and ROVs. In addition to the UBA, support equipment must
not be overlooked. Items commonly used include tools, underwater lighting,
power sources, and communications systems. The Coordinated Shipboard Allow-
ance List (COSAL) for the diving platform is a reliable source of support
equipment. Commercial resources may also be available.
Table 13-3. Mixed Mixed gasGas Diving Equipment.
Type
Principal
Applications
Minimum
Personnel
Advantages
Disadvantages
Restrictions and
Depth Limits
MK 21 MOD 1
EXO BR MS
(Notes 1 & 3)
Deep search,
inspection and
repair.
12
(Note 3)
Horizontal mobility.
Voice
communications.
Support craft required.
High rate of gas
consumption.
Normal 300 fsw.
Maximum: 380 fsw
with CNO
authorization.
MK 21 MOD 0
(Note 2)
Saturation diving
search, salvage,
and repair.
Extensive bottom
time.
21 (7 per
watch)
(Note 4)
Maximum diver
safety. Bottom time
efficiency. Maximum
comfort. Continuous
personnel monitoring.
Slow deployment.
Large support craft
and crew. Limited
mobility. High rate of
gas consumption.
Varies with DDS
certification
MK 22 MOD 0
(Note 2)
Standby diver for
PTC.
21 (7 per
watch)
(Note 4)
Collapsible for
storage in PTC.
Slow deployment.
Large support craft
and crew. Limited
mobility. High rate of
gas consumption.
Varies with DDS
certification
Notes:
1.
surface supplied deep-sea
2.
Saturation UBA
3.
Minimum personnel consists of topside support and one diver in the water
4.
Varies according to manning requirements of deep dive system
