Chapter 7 & 8 Us Navy Dive Manual, Rev 6

Front 1

Can u make a planned decompression dive in SCUBA?

Back 1

Decompression diving using open-circuit air SCUBA may be undertaken 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 the following items to safely conduct an open-circuit SCUBA dive:

Back 2

Open-circuit SCUBA, Face mask, Life preserver/buoyancy compensator, Weight belt and weights as required, Knife, Swim fins, Submersible pressure gauge or Reserve J-valve, Submersible wrist watch, Only one is required when diving in pairs with a buddy line, Depth gauge, Octopus.

Front 3

Open-circuit SCUBA cylinders must be visually inspected at least:

Back 3

Once every 12 months and every time water or particulate matter is suspected in the cylinder.

Front 4

How often are SCUBA cylinders hydrostatically tested?

Back 4

Every 5 years.

Front 5

What is the minimum size SCUBA cylinder authorized for navy use?

Back 5

Fifty cubic feet

Front 6

When is it authorized to dive without a submersible pressure gauge?

Back 6

When there is a j-valve installed

Front 7

The dive must be terminated when the cylinder pressure reaches ____ psi for a single cylinder or ____ psi for twin manifold cylinders.

Back 7

500 & 250

Front 8

What is the difference between a life preserver and buoyancy compensator?

Back 8

The life preserver must be sturdy enough to resist normal wear and tear, and of sufficient volume to raise an unconscious diver safely from maximum dive depth to the surface. Most life preservers currently in use employ carbon dioxide (CO2) cartridges to provide inflation in an emergency
As a buoyancy compensating device, the compensator can be inflated by a low-pressure inflator connected to the first-stage regulator, or an oral inflation tube. Any buoyancy compensator selected for Navy use must have an over-pressure relief valve.

Front 9

At the dive supervisor’s discretion, when using a_____, a Buoyancy Compensator is not required.

Back 9

variable volume dry suit (VVDS)

Front 10

What are the characteristics / requirements of a knife?

Back 10

Knives may have single- or double-edged blades with chisel or pointed tips. The most useful knife has one sharp edge and one saw-toothed edge. All knives must be kept sharp. The knife must be carried in a suitable scabbard and worn on the diver’s life preserver, hip, thigh, or calf. The knife must be readily accessible, must not interfere with body movement, and must be positioned so that it will not become fouled while swimming or working. The scabbard should hold the knife with a positive but easily released lock. The knife and scabbard must not be secured to the weight belt. If the weights are released in an emergency, the knife may be also dropped unintentionally.

Front 11

What are three basic types of lifelines?

Back 11

the tending line, the float line, and the buddy line.

Front 12

What are the tending requirements for a single diver?

Back 12

A single diver will be tended with either a tending line or a float line. When direct access to the surface is not available a tending line is mandatory. A float line may not be used.
- Low Vis/night, displacement from dive site

Front 13

What are the characteristics of a tending line?

Back 13

The line should be strong and have neutral or slightly positive buoyancy. Nylon, Dacron, and manila are all suitable materials. Always attach a lifeline to the diver, never to a piece of equipment that may be ripped away or may be removed in an emergency.

Front 14

Buddy lines are __ to __ feet in length.

Back 14

6-10

Front 15

Air procured from commercial sources must meet what requirements

Back 15

Grade A Source I or Source II air

Front 16

To prevent whipping in the event of hose failure under pressure, the use of a strain relief made of what?

Back 16

cable, chain, 21-thread, or 3/8-inch nylon, married at a minimum of every 18 inches and at the end of the hose. Marrying cord shall be 1/8-inch nylon or material of equivalent strength. Tie wraps, tape, and marlin are not authorized for this purpose.

Front 17

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 past ____.

Back 17

135 & year

Front 18

The greatest single safety practice in Navy SCUBA operations is the use of what?

Back 18

the buddy system.

Front 19

The tender should signal the diver with a single pull every __ or __ minutes to determine that the diver is all right.

Back 19

2-3

Front 20

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

Back 20

voice communications with the Diving Supervisor.

Front 21

An EGS is mandatory at depths deeper than __ fsw and when diving inside a wreck or enclosed space.

Back 21

60

Front 22

Planned air dives below ___ fsw require ____________ approval.

Back 22

190 & CNO

Front 23

What are the Emergency Gas Supply Requirements for the MK21 and KM37

Back 23

The EGS system consists of an adequately charged ANU approved SCUBA cylinder with either a K- or J- valve (with reserve turned down) and a first stage regulator set at manufacturer’s recommended pressure, but not lower than 135 psig. A relief valve set at 180 ± 5 psig over bottom pressure must be installed on the first stage regulator to prevent rupture of the low pressure hose should the first stage regulator fail. A submersible pressure gauge is also required on the first stage regulator. For enclosed space diving an extended EGS whip 50 to 150 feet in length may be used. If the diving scenario requires the EGS topside, adjust the first stage regulator to 135 psi over bottom pressure.

Front 24

What is the definition of an adequately charged SCUBA cylinder?

Back 24

the pressure that provides sufficient air to bring the diver to his first decompression stop or the surface for no-decompression dives.

Front 25

The MK 20 MOD 0 is authorized for use to a depth of ___ fsw with surface-supplied air.

Back 25

60

Front 26

What are the EGS Requirements for MK 20 MOD 0?

Back 26

An adequately charged ANU approved SCUBA cylinder with either a K- or J-valve.
An approved SCUBA regulator set at manufacturer’s recommended pressure, but not lower than 135 psi, with an extended EGS whip 50 to 150 feet in length. If the diving scenario dictates leaving the EGS topside, adjust the first stage regulator to 150 psig.
An approved submersible pressure gauge.

Front 27

The EXO BR MS is a commercial-off-the-shelf, full face mask, manufactured by Kirby Morgan Dive Systems, which is used for surface-supplied diving. It is authorized for use to ___ fsw on air.

Back 27

190

Front 28

What does a MK 3 LWDS flask rack consist of?

Back 28

Each rack has 3 flasks which are (0.935 cu ft floodable volume each). Each flask holds 191 scf of compressed air at 3,000 psi.

Front 29

Describe the MK 3 MOD 0 Configuration 1.

Back 29

Air is supplied by a medium-pressure diesel driven compressor unit supplying primary air to the divers at 18 standard cubic feet per minute (scfm) with secondary air being supplied by one air-rack assembly. Total available secondary air is 594 scf.

Front 30

Describe the MK 3 MOD 0 Configuration 2.

Back 30

Primary air is supplied to the divers using three flask rack assemblies. Secondary air is supplied by one flask rack assembly. Total available primary air is 1,782 scf at 3,000 psi. Total available secondary air is 594 scf.

Front 31

Describe the MK 3 MOD 0 Configuration 3.

Back 31

Primary air is supplied to the divers using three flask rack assemblies. Secondary air is supplied by two flask rack assemblies. Total available primary air is 1,782 scf. Total available secondary air is 1,188 scf.

Front 32

Describe the MK 3 MOD 1 Lightweight Dive System.

Back 32

This system is identical to the MK 3 MOD 0 LWDS except that the control console and volume tank have been modified to support 5,000 psi operations for use with the Air Supply Rack Assembly (ASRA). With appropriate adapters the system can still be used to support normal LWDS operations.

Front 33

Describe the ROPER Diving Cart.

Back 33

The ROPER diving cart is a trailer-mounted diving system, designed to support one working and one standby diver in underwater operational tasks performed by Ship Repair Activities to 60 fsw. Air supply system. Primary air source of two 6 cu ft, 3,000 psi air flasks; secondary air source of a single 1.52 cu ft, 3,000 psi air flask; and a SCUBA charging station.

Front 34

Describe the The FADS III.

Back 34

It is a portable, self-contained, surface-supplied diver life-support system designed to support dive missions to 190 fsw. Compressed air at 5,000 psi is contained in nine 3.15 cu ft floodable volume composite flasks vertically mounted in an Air Supply Rack Assembly (ASRA).

Front 35

What is the purpose of the Oxygen Regulator Console Assembly (ORCA)?

Back 35

To provide 100% oxygen to the diver’s umbilical’s for use during in-water oxygen decompression.

Front 36

What line is recommended for a descent line?

Back 36

A 3-inch double-braid line is recommended, to prevent twisting and to facilitate easy identification by the diver on the bottom.

Front 37

What is a circling line?

Back 37

The circling line is attached to the bottom end of the descent line. It is used by the diver as a guide in searching and for relocating the descent line.

Front 38

What is a stage line?

Back 38

Used to raise and lower the stage, the stage line is to be 3-inch double braid, or 3/8-inch wire rope minimum, taken to a capstan or run off a winch and davit.

Front 39

What are the primary are requirements of a DLSS?

Back 39

The primary supply must be able to support the air flow and pressure requirements for the diving equipment designated. The capacity of the primary supply must meet the consumption rate of the designated number of divers for the full duration of the dive (bottom time plus decompression time).

Front 40

What are the secondary air requirements of a DLSS?

Back 40

The secondary supply must be sized to be able to support recovery of all divers using the equipment and dive profile of the primary supply if the primary supply sustains a casualty at the worst-case time

Front 41

All valves and electrical switches that directly influence the air supply shall be labeled:

Back 41

“DIVER’S AIR SUPPLY- DO NOT TOUCH”

Front 42

A ______________is required when operating directly from a low pressure air compressor.

Back 42

volume tank

Front 43

What type of air compressors are the only compressors authorized for use in Navy air diving operations?

Back 43

Reciprocating

Front 44

What are the three line pull signals that are not answered immediately?

Back 44

Two of these, from diver to tender, are “Haul me up” and “Haul me up immediately.” Acknowledgment consists of initiation of the action. The other signal, from the tender to diver, is “Come up.” This signal is not acknowledged until the diver is ready to leave the bottom.

Front 45

Line Pull Signals From Tender to Diver

Back 45

1 Pull “Are you all right?” When diver is descending, one pull means “Stop.”
2 Pulls “Going Down.” During ascent, two pulls mean “You have come up too far; go back down until we stop you.”
3 Pulls “Stand by to come up.”
4 Pulls “Come up.”
2-1 Pulls “I understand” or “Talk to me.”
3-2 Pulls“Ventilate.”
4-3 Pulls“Circulate.”

Front 46

Line Pull Signals From Diver to Tender

Back 46

1 Pull “I am all right.” When descending, one pull means “Stop” or “I am on the bottom.”
2 Pulls “Lower” or “Give me slack.”
3 Pulls “Take up my slack.”
4 Pulls “Haul me up.”
2-1 Pulls “I understand” or “Talk to me.”
3-2 Pulls “More air”
4-3 Pulls "less air"

Front 47

Special Signals From the Diver

Back 47

1-2-3 Pulls “Send me a square mark.”
5 Pulls “Send me a line.”
2-1-2 Pulls “Send me a slate.”

Front 48

Searching Signals (Without Circling Line)

Back 48

7 Pulls “Go on (or off) searching signals.”
1 Pull “Stop and search where you are.”
2 Pulls “Move directly away from the tender if given slack; move toward the tender if strain is taken on the life line.”
3 Pulls “Face your umbilical, take a strain, move right.”
4 Pulls “Face your umbilical, take a strain, move left.”

Front 49

Searching Signals (With Circling Line)

Back 49

7 Pulls “Go on (or off) searching signals.”
1 Pull “Stop and search where you are.”
2 Pulls “Move away from the weight.”
3 Pulls “Face the weight and go right.”
4 Pulls “Face the weight and go left.”

Front 50

Emergency Signals From the Diver

Back 50

2-2-2 Pulls “I am fouled and need the assistance of another diver.”
3-3-3 Pulls “I am fouled but can clear myself.”
4-4-4 Pulls “Haul me up immediately.”

Front 51

In relation to searching, what is the Jack-Stay method

Back 51

The jack-stay can be established by laying two large buoys and setting a line between them. A diving launch, with a diver on the bottom, can follow along the line from buoy to buoy, coordinating progress with the diver who is searching to each side of the established base line.

Front 52

When a diver is working in an enclosed or confined space with the exception of submarine ballast tanks, the Diving Supervisor shall have the diver tended by another diver at the ____________.

Back 52

access opening

Front 53

When diving in submarine ballast tanks, the divers shall not remove their diving equipment until what?

Back 53

the atmosphere has been flushed twice with air from a compressed air source meeting the requirements of Chapter 4, or the submarine L.P. blower, and tests confirm that the atmosphere is safe for breathing. Tests of the air in the enclosed space shall be conducted hourly. If the divers smell any unusual odors they shall immediately don their EGS.

Front 54

During enclosed space diving, all divers shall be outfitted with what basic equipment?

Back 54

a MK 21 MOD 1, KM-37, MK 20 MOD 0, or EXO BR MS that includes a diver-to-diver and diver-to-topside communications system and an EGS for the diver inside the space.

Front 55

Is steel cable or chain authorized for a descent line?

Back 55

Yes the Diving Officer must approve such use.

Front 56

The maximum working depth for air diving operations using the MK 21 MOD 1 and KM-37 UBAs is ____ fsw.

Back 56

190