Navy Diving Manual Rev 6 Chapter 7 Scuba Air Diving Operations

Front 1

When may decompression dives using open-circuit air SCUBA be undertaken?

Back 1

Only if no other option exists and only with the concurrence of the Commanding Officer or Officer-in-Charge (OIC).

Front 2

At a minimum, each diver must be equipped with what items to safely conduct an open-circuit SCUBA dive?

Back 2

1. Open-circuit SCUBA
2. Face mask
3. Life preserver/buoyancy compensator
4. Weight belt and weights as required
5. Knife
6. Swim fins
7. Submersible pressure gauge or Reserve J-valve
8. Submersible wrist watch. Only one is required when diving in pairs with a buddy line
9. Depth gauge

Front 3

When is an octopus is mandatory?

Back 3

For standby divers and U.S. Navy Civilian divers

Front 4

What information can be found on the neck of an aluminum cylinder?

Back 4

1. DOT material specification
2. Service working pressure
3. Serial number assigned by manufacturer
4. Inspector’s stamp
5. Month and year of initial qualification test

Front 5

The internal volume of the cylinder is expressed how?

Back 5

In actual cubic feet or cubic inches

Front 6

The capacity of a cylinder is the amount of gas (measured at surface conditions) that the cylinder holds when charged to its rated pressure. How is it expressed?

Back 6

In standard cubic feet or liters

Front 7

What are the inspection requirements for open-circuit SCUBA cylinders?

Back 7

1. Must be visually inspected at least once every 12 months and every time water or particulate matter is suspected in the cylinder. Cylinders containing visible accumulations of corrosion must be cleaned before being placed into service.
2. Must be visually hydrostatically tested at least every five years

Front 8

What is the minimum size SCUBA cylinder authorized for use?

Back 8

50 cubic feet

Front 9

When a cylinder valve without an air reserve (K valve) is used, the SCUBA regulator must be equipped with what?

Back 9

A submersible pressure gauge to indicate pressure contents of the cylinder.

Front 10

In regards to air, when must a SCUBA dive be terminated?

Back 10

1. When a diver activates his reserve
2. 250 psi for double cylinders
3. 500 psi for single cylinder

Front 11

All straps on SCUBA backpack or harness must have what feature?

Back 11

A quick-release feature, easily operated by either hand, so that the diver can remove the cylinder and leave it behind in an emergency.

Front 12

All models of life preservers used with SCUBA must be authorized by NAVSEA/00C Authorized for Navy Use List and have what three features?

Back 12

1. A manual inflation device
2. Low pressure inflation device
3. With the exception of the UDT, an overinflation valve or relief valve is required to ensure against possible rupture of the life preserver on ascent

Front 13

What must be inscribed on the CO2 cartridges used in life preservers?

Back 13

The actual weight and be within the tolerance for weight.

Front 14

When using a variable volume dry suit (VVDS) during SCUBA operations, at the dive supervisor’s discretion, what minimum equipment is not required?

Back 14

A buoyancy compensator

Front 15

What is required when using K valve?

Back 15

Submersible cylinder pressure gauge

Front 16

What is the preferred type of signal flare?

Back 16

MK 99 MOD 3

Front 17

What are the three basic types of lifelines?

Back 17

1. Tending line
2. Float line
3. Buddy line

Front 18

When should a lifeline be used?

Back 18

1. When it is necessary to exchange signals
2. Keep track of the diver’s location
3. Operate in limited visibility
4. A single diver

Front 19

A single diver will be tended with either a tending line or a float line. When will tending line be mandatory and a float line not be used?

Back 19

When direct access to the surface is not available

Front 20

How long is a buddy line?

Back 20

6 to 10 feet

Front 21

What kind of buoyancy should the tending line used in SCUBA operations be?

Back 21

Neutral or slightly positive buoyancy. Nylon, Dacron, and manila are all suitable materials.

Front 22

Where do you attach a lifeline?

Back 22

To the diver, never to a piece of equipment that may be ripped away or may be removed in an emergency

Front 23

Air procured from commercial sources must meet what requirements?

Back 23

Grade A Source I or Source II air as specified by FED SPEC BB-A-1034B.

Front 24

How is the working pressure of a charging hose determined?

Back 24

One-fourth of its burst pressure

Front 25

Strain reliefs married to charging hoses will be made from what type material?

Back 25

1. Cable
2. Chain
3. 21-thread
4. 3/8-inch nylon

Front 26

Strain reliefs will be married to charging hoses at a minimum of every _____ inches and at the end of the hose.

Back 26

18

Front 27

Marrying cord for charging hoses shall be _________________ or material of equivalent strength.

Back 27

1/8-inch nylon

Tie wraps, tape, and marlin are not authorized for this purpose.

Front 28

In accordance with pre-dive procedures, ensure over-bottom pressure of first stage regulator has been set to a minimum of _____ psig or in accordance with manufacturer’s recommendations within the last ________.

Back 28

135 psig, year

Front 29

The rate of descent for SCUBA will generally be governed by the ease with which the divers will be able to equalize the pressure in their ears and sinuses, but it should never exceed _____ feet per minute.

Back 29

75 feet per minute

Front 30

What is the greatest single safety practice in Navy SCUBA operations?

Back 30

The use of the buddy system

Front 31

What must be used in poor visibility during buddy SCUBA diving?

Back 31

A buddy line

Front 32

The tender during SCUBA diving operations should signal the diver with a single pull every ________________ to determine that the diver is all right. A return signal of one pull indicates that the diver is all right.

Back 32

2 or 3 minutes

Front 33

When using externally powered tools with SCUBA, what must the diver have?

Back 33

Voice communications with the Diving Supervisor

Front 34

True or False. The intermediate hose for an octopus must be 36 inches in length. Explain.

Back 34

False. Hose length and designation markings are at the discretion of the diving supervisor.

Front 35

Where may a knife be worn?

Back 35

1. Life preserver or B/C
2. Hip
3. Thigh
4. Calf

Front 36

Where must a knife never be worn?

Back 36

On the weight belt

Front 37

What is the charging rate for SCUBA cylinders?

Back 37

1. 200 psi/min dry
2. 400 psi/min wet

Front 38

True or False. When diving SCUBA buddy pairs and a buddy line is used, only one depth gauge and one watch per dive team is required.

Back 38

True

Front 39

When does a single diver not have to use a tending line or float line?

Back 39

During EOD operations involving limpet search and neutralization

Front 40

What is the normal and max working limits for SCUBA?

Back 40

Normal 130 fsw, Max 190 fsw with CO or OIC’s permission

Front 41

What is the maximum depth for a diver with less than a 100 scf cylinder?

Back 41

100 fsw

Front 42

For dives deeper than 60 fsw, standby diver must have at least _____ scf cylinder capacity.

Back 42

100 scf