Us Navy Dive Manual Rev 6 Change A

Front 1

What is gas mixture percentages range used in NITROX diving?

Back 1

Ranges from
75% N2- 25%O2
to
60% N2 - 40%O2

Front 2

NITROX diving is limited to what depth?

Back 2

140ft., but is most useful at depths shallower than 50'

Front 3

What are the advantages of NITROX diving?

Back 3

Extended bottom times for no-decompression diving.

Reduced decompression time.

Reduced residual nitrogen in the body after a dive.

Reduced possibility of decompression sickness.

Reduced Nitrogen Narcosis

Front 4

What are the disadvantages of NITROX diving?

Back 4

Increased risk of CNS oxygen toxicity.

Producing NITROX mixtures requires special equipment.

NITROX equipment requires special cleaning techniques.

Long-duration NITROX dives can result in pulmonary oxygen toxicity.

Working with NITROX systems requires special training.

NITROX is expensive to purchase.

Front 5

What is EAD?

Back 5

Oxygen plays no role. The decompression obligation for a NITROX dive therefore can be determined using the Standard Air Tables simply by selecting the depth on air that has the same partial pressure of nitrogen as the NITROX mixture.

Front 6

Normal working dives that exceed PPO2 of ____ ata are not allowed.

Back 6

1.4 ata to avoid CNS O2 Tox

Front 7

For NITROX diving in SCUBA how often should the mix be analyzed in each bottle?

Back 7

prior to every dive

Front 8

What 3 topics must be covered prior to NITROX diving?

Back 8

Pulmonary and CNS oxygen toxicity associated with NITROX diving.

EAD tables and their association with the air tables.

Safe handling of NITROX mixtures.

Front 9

NITROX Charging and Mixing Technicians must be trained on the following topics:

Back 9

Oxygen handling safety.

Oxygen analysis equipment.

NITROX mixing techniques.

NITROX cleaning requirements (MIL-STD-1330 Series).

Front 10

Open Circuit Scuba NITROX diving is the same set up except two things that have a slighly different setup which are..

Back 10

SCUBA regulators designated for NITROX use should be cleaned to the standards of MIL-STD-1330.
Bottles. SCUBA bottles designated for use with NITROX should be oxygen cleaned and maintained to that level. The bottles should have a NITROX label in large yellow letters on a green background.

Front 11

For Surface Supplied NITROX diving; a request to convert the system to NITROX must be forwarded to who for approval.

Back 11

NAVSEA

Front 12

The EGS used in surface-supplied NITROX diving shall be filled with the same mixture that is being supplied to the diver ± what percent.

Back 12

0.5 percent

Front 13

How techniques are there for mixing O2, what are they

Back 13

2/ Continuous flow and Mixing by partial pressure

Front 14

What are techniques for the continous flow method mixing NITROX?

Back 14

Mix-maker and Oxygen Induction.

Front 15

Explain the mix maker method.

Back 15

Mix-maker. A mix-maker uses a precalibrated mixing system that proportions the amount of each gas in the mixture as it is delivered to a common mixing chamber. A mix-maker performs a series of functions that ensures accurate mixtures. The gases are regulated to the same temperature and pressure before they are sent through precision metering valves. The valves are precalibrated to provide the desired mixing pressure. The final mixture can be provided directly to the divers or be compressed using an oil-free compressor into storage banks.

Front 16

Explain the Oxygen induction

Back 16

Oxygen Induction. Oxygen induction uses a system where low pressure oxygen is delivered to the intake header of an oil-free compressor, where it is mixed with the air being drawn into the compressor. Oxygen flow is adjusted and the compressor output is monitored for oxygen content. When the desired NITROX mixture is attained the gas is diverted to the storage banks for diver use while being continually monitored for oxygen content (Figure 10‑3).

Front 17

What are the techniques used for mixing by partial pressure?

Back 17

Mixing using a membrane system and mixing using molecular sieves

Front 18

What is the max charging rate for NITROX?

Back 18

200psi/min