DMT > SCUBA Ops > Flashcards

SCUBA Ops Flashcards

(60 cards)

Study These Flashcards
1
Q

DJRS

A

Dive Jump Reporting System

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

Advantages of SCUBA (5)

A
  • rapid deployment
  • portability
  • minimum support
  • excellent horizontal and vertical mobility
  • minimum bottom disturbances
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

Disadvantages of SCUBA (4)

A
  • limited depth & duration
  • limited physical protection
  • influenced by the environment
  • lack of voice comms
  • SCUBA can be one of the most dangerous rigs to dive because of its limitations.
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

SCUBA applications (3)

A
  • shallow H2O searches
  • inspections
  • light repair & recovery
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

SCUBA equipment is not authorized for use in ___ ___.

A

enclosed spaces

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

Operational depth restrictions for SCUBA:

  • normal working limits
  • max working limits… c/
A
  • 130 fsw

- 190 fsw c/ CO or OIC’s permission

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

SCUBA restrictions:

  • working diver
  • standby diver
  • time (2)
A
  • may descend down to 100 fsw c/ a tank < 100 scf
  • may ascend down to 60 few c/ a tank < 100 scf
  • all SCUBA ops are planned as No ‘D’
    must have CO or OIC permission to ‘D’ dive c/ SCUBA
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

Current restriction for SCUBA

A

1.0 Kt is max acceptible current

> 1.0 Kt requires ORM analysis

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

Most common SCUBA casual is ___.

A

drowning

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

SCUBA major components (12)

A 
1st stage regulator
cylinder
backpack
manifold
depth gauge
chaffing gear
weight belt
knife
LP/BC
cylinder pressure gauge
watch 
fins
mask
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Single Hose Reg fx of:

  • 1st stage
  • intermediate hose
  • 2nd stage
A
  • reduce HP to LP overbottom pressure > or = to 135 psig
  • delivers HP air from 1st to 2nd stage
  • delivers LP air to diver slightly over the ambient pressure
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Cylinders:

  • made of two types of metal
  • working pressures
  • volume
A
  • steel or Al
  • Steel 2250 psig
    Al 3000 psig
  • Steel ‘72’ = 64.7 scf @ 2250 psig
    AL ‘80’ = 81.25 scf @ 3000 psig
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

DOT regulates hydrostatic testing of cylinders q ___ years to ___ times the working pressure

A

5yrs

1 ⅔

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Cylinders must be visually inspected q ___ or when…

A

year or when water/particulate matter is suspected.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Backpack must have ___ straps and must be approved on the ___ list

A

quick release

AMU

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Manifold:

  • fx
  • check q time before use
A
  • delivers HP air from tank to reg

- check o-ring before each use

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
17
Q

Manifold parts (LOAD PIC)

A

sfasdfasdf

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

Blow out disc:

  • __ disc per cylinder
  • prevents…
  • set to ___% of max capacity
A
  • one
  • over pressurization
  • 10%
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q
  • Define K valve

- requires…

A
  • = kill valve, no reserve

- submersible pressure gauge

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

Define J valve

A

provides 500 psi reserve in the single tanks and 250 per tank c/ doubles

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

Reserve valve must be down when… (3)

A
  • charging tanks
  • gauging tanks
  • breathing on reserve
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Depth gauge is ____.

A

mandatory

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
23
Q

Protective clothing fx (2)

A

chaff gear and warmth

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
24
Q

VVDS

  • defined
  • required when
A
  • Variable Volume Dry Suit

- USN requires special cold wx gear c/ diving in temps < 37F. Will need extra weights too.

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
25
Weight belt must have ___.
quick release
26
Knife is ___. Never wear on ....
mandatory | on anything that will be ditched in an emergency.
27
LP/BC is mandatory except
under ice * prevents trauma during a blowup or uncontrolled ascent
28
LP (2)
- must have an oral inflator | - keeps diver face up
29
BC: - must have (4) - fx (2)
- power inflator & oral inflator releasable weights over inflation device 10lbs of lift @ max depth - adjustable buoyancy device keeps diver afloat on surface
30
CO2 carts must have (2)
gross wt inscribed | PMS before each use
31
Cylinder pressure gauge calibrated q ___ months
18 months
32
Watch is ___.
mandatory
33
Octopus reg is mandatory for ___ divers
standby
34
SCUBA optional equipment (9)
``` UDT, chaff gear, VVDS submersible pressure gauge (only c/ J valve) signal flare compass whistle slate snorkel light line ```
35
SCUBA manning requirements: - single SCUBA diver - 2 SCUBA divers
- 4 (dive sup, diver, tender, stbdy) | - 3 (dive sup, 2 divers, tender)
36
Stdby diver is ___ on all USN dives. SCUBA stdby diver may not stdby for ___. Stdby diver must have a ___ on his rig and must be___.
mandatory surface supply dives octopus tended
37
All line pull signals are answered except
4 | 4-4-4
38
Tender should signal a diver q ___ to ___ mins and...
2-3 mins and inform the Div sup c/ each message.
39
Failure to respond to line pulls = (3)
- fouled line - too much slack - diver is in trouble
40
Tending line used when... (6)
- no access to the surface (under a ship) - to exchange signals (searching) - c/ limited visibility - as stdby diver - c/ single diver - ice diving
41
LINE PULLS Tender to Diver ``` 1 2 3 4 2-1 3-2 4-3 ```
``` 1 - stop, are you ok 2 - go down 3 - stdby to come up 4 - come up 2-1 I understand or talk to me 3-2 ventilate 4-3 circulate ```
42
LINE PULLS Diver to Tender ``` 1 2 3 4 2-1 3-2 4-3 ```
``` 1 - on bottom, stopped or I'm ok 2 - lower or give me slack 3 - take up slack 4 - haul me up 2-1 i understand or talk to me 3-2 more air 4-3 less air ```
43
Special signals: 1-2-3 5 2-1-2
1-2-3 send me a square mark 5 send me a line 2-1-2 send me a slate
44
Emergency signals: 222 333 444
222 i need you 333 i need me 444 get me off the floor (@ 30' per sec)
45
Searching signals (s/ circling line): ``` 7 1 2 3 4 ```
``` 7 - signals on/off 1 - stop and search 2 - move forward or back 3 - move right 4 - move left ```
46
EP's ascents 3 reasons
- fouled equipment - loss of air - incapacitated or unconscious diver
47
EP's free ascent procedure (6)
drop tools drop weight belt ditch tanks PRN * during ascent cylinders may acquire expanded air exhale c/ ascent upon RS inflate LP/BC notify dive sup
48
EP's buoyant ascent (6)
``` drop tools drop weight belt use auto inflator or CO2 cart (in extreme situation) keep head back and exhale RS then inflate LP/BC notify dive sup ``` * use buoyant ascent only when unable to make a free ascent
49
EP's Trapped diver (4)
``` approach c/ caution asses the area for safety assess the diver: - injuries - air qty - workload to free diver return to surface and report ``` *leave him your air and tie a tending line to him
50
EP's Injured diver (4)
approach c/ caution assess the area for safety stabilize any injuries and ascend upon RS start BTLS and notify dive sup
51
EP's Loss of Air (4)
check air supply (air all the way on back a ¼) check reserve try 2ndary reg start buddy breathe
52
EP's Unconscious diver cause (5)
``` CO tox CO2 tox N2 Narcosis Entrapment or injury Disoriented, poor visibility, current ```
53
EP's unconscious diver (11)
``` approach c/ caution open airway & insert reg check air (psig & reserve) check VS ensure open airway signall 4-4-4 & ascend press on divers chest inflate LP/BC @ surface maintain open airway yell for help report to dive sup - position of found diver - tank psig - VS - condition of gear ```
54
EP's Lost diver (3)
``` make 360 deg search begin ascent tapping 4-4-4 looking for: - bubbles - disturbed mud RS look around, stay in your position, notify dive sup ```
55
Charging Cylinders: - 2 methods - rates (wet/dry)
- cascading (fastest) HP compressor - 400 psig wet 200 psig dry
56
Cylinders must have a minimum of ___ psi difference to charge.
50 psi
57
Operational planning
"Plan your Brief, brief you plan" | "Plan your Dive, dive you Plan"
58
Dive sup brief check list (12)
``` objectives time/depths tasks buddy assignments work techs/tools phases of dive route to work site special signals hazards EP's EAP/mishaps Emergency equipment ```
59
Hazards (8)
``` current visibility (above and below the surface) temp contaminated H2O under H2O obstacles sonar DML vessels/boat traffic ```
60
EP's (6)
``` Unconscious diver trapped diver loss of air injured diver lost diver aborted dive ```
DMT
flashcards
Decks in class (15)
# Cards
Brainscape helps you reach your goals faster, through stronger study habits.
© 2026 Bold Learning Solutions. Terms and Conditions