Mixedgas Diving Equipment

There are several modes of diving that are characterized by the diving equipment used. The following descriptions outline capabilities and logistical requirements for various mixed-gas diving systems.

13-8.1 Minimum Required Equipment. Minimum required equipment for the pool phase of dive training conducted at Navy diving schools may be modified as necessary. Any modifications to the minimum required equipment listed herein must be noted in approved lesson training guides.

Minimum Equipment:

1. MK 21 MOD 1 helmet with tethered umbilical

2. Thermal protection garment

3. Weight belt

4. Dive knife

5. Swim fins or shoes/booties

6. EGS bottle with submersible tank pressure gauge

7. Integrated diver's vest/harness

13-8.2 MK 21 MOD 1 Lightweight Surface-Supplied Helium-Oxygen Description.

Principle of Operation:

Surface-supplied open-circuit mixed-

gas (HeO2) system

Operational Considerations:

1. Adequate mixed-gas supply

2. Master Diver required on station for mixed-gas operations

3. Diving Medical Officer required on-site for dives deeper than 300 fsw

4. Recompression chamber required on-site

5. Planned exceptional exposure dives or dives exceeding normal working limits require CNO approval

6. Breathing gas heater

7. Hot water suit

Figure 13-4. MK 21 MOD 1 UBA.

13-8.3 Flyaway Dive System III Mixed Gas System (FMGS). The FADS III Mixed Gas System (FMGS) is a portable, self-contained, surface-supplied diver life-support system designed to support mixed gas dive missions to 300 fsw (Figure 13-5 and Figure 13-6). The FMGS consists of five gas rack assemblies, one air supply rack assembly (ASRA), one oxygen supply rack assembly (OSRA), and three helium-oxygen supply rack assemblies (HOSRA). Each rack consists of nine 3.15 cu ft floodable volume composite flasks vertically mounted in rack assembly. The ASRA will hold 9600 scf of compressed air at 5000 psi. Compressed air is provided by a 5000 psi air compressor assembly, which includes an air purification system. Oxygen is stored at 3000 psi. The FMGS also includes a mixed-gas control console assembly (MGCCA) and two gas booster assemblies for use in charging the OSRA and HOSRA. Three banks of two, three, and four flasks allow the ASRA to provide air to the divers as well as air to support chamber operations. Set-up and operating procedures for the FMGS are found in the Operating and Maintenance Technical Manual for Fly Away Dive System (FADS) III Mixed Gas System, S9592-B2-OMI-010.

Fads Iii Mixed Gas System Fmgs
Figure 13-5. FADS III Mixed Gas System (FMGS).

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