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DMT > SCUBA Ops > Flashcards

SCUBA Ops Flashcards

1
Q

DJRS

A

Dive Jump Reporting System

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2
Q

Advantages of SCUBA (5)

A
  • rapid deployment
  • portability
  • minimum support
  • excellent horizontal and vertical mobility
  • minimum bottom disturbances
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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.
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4
Q

SCUBA applications (3)

A
  • shallow H2O searches
  • inspections
  • light repair & recovery
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5
Q

SCUBA equipment is not authorized for use in ___ ___.

A

enclosed spaces

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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

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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
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8
Q

Current restriction for SCUBA

A

1.0 Kt is max acceptible current

> 1.0 Kt requires ORM analysis

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9
Q

Most common SCUBA casual is ___.

A

drowning

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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
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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
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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
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13
Q

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

A

5yrs

1 ⅔

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14
Q

Cylinders must be visually inspected q ___ or when…

A

year or when water/particulate matter is suspected.

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15
Q

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

A

quick release

AMU

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16
Q

Manifold:

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

- check o-ring before each use

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17
Q

Manifold parts (LOAD PIC)

A

sfasdfasdf

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18
Q

Blow out disc:

  • __ disc per cylinder
  • prevents…
  • set to ___% of max capacity
A
  • one
  • over pressurization
  • 10%
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19
Q
  • Define K valve

- requires…

A
  • = kill valve, no reserve

- submersible pressure gauge

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20
Q

Define J valve

A

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

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21
Q

Reserve valve must be down when… (3)

A
  • charging tanks
  • gauging tanks
  • breathing on reserve
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22
Q

Depth gauge is ____.

A

mandatory

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23
Q

Protective clothing fx (2)

A

chaff gear and warmth

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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.

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25
Q

Weight belt must have ___.

A

quick release

26
Q

Knife is ___. Never wear on ….

A

mandatory

on anything that will be ditched in an emergency.

27
Q

LP/BC is mandatory except

A

under ice

  • prevents trauma during a blowup or uncontrolled ascent
28
Q

LP (2)

A
  • must have an oral inflator

- keeps diver face up

29
Q

BC:

  • must have (4)
  • fx (2)
A
  • power inflator & oral inflator
    releasable weights
    over inflation device
    10lbs of lift @ max depth
  • adjustable buoyancy device
    keeps diver afloat on surface
30
Q

CO2 carts must have (2)

A

gross wt inscribed

PMS before each use

31
Q

Cylinder pressure gauge calibrated q ___ months

A

18 months

32
Q

Watch is ___.

A

mandatory

33
Q

Octopus reg is mandatory for ___ divers

A

standby

34
Q

SCUBA optional equipment (9)

A 
UDT, chaff gear, VVDS
submersible pressure gauge (only c/ J valve)
signal flare
compass
whistle
slate
snorkel
light
line
35
Q

SCUBA manning requirements:

  • single SCUBA diver
  • 2 SCUBA divers
A
  • 4 (dive sup, diver, tender, stbdy)

- 3 (dive sup, 2 divers, tender)

36
Q

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___.

A

mandatory
surface supply dives
octopus
tended

37
Q

All line pull signals are answered except

A

4

4-4-4

38
Q

Tender should signal a diver q ___ to ___ mins and…

A

2-3 mins and inform the Div sup c/ each message.

39
Q

Failure to respond to line pulls = (3)

A
  • fouled line
  • too much slack
  • diver is in trouble
40
Q

Tending line used when… (6)

A
  • no access to the surface (under a ship)
  • to exchange signals (searching)
  • c/ limited visibility
  • as stdby diver
  • c/ single diver
  • ice diving
41
Q

LINE PULLS Tender to Diver

1
2
3
4
2-1
3-2
4-3
A 
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
Q

LINE PULLS Diver to Tender

1
2
3
4
2-1
3-2
4-3
A 
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
Q

Special signals:

1-2-3
5
2-1-2

A

1-2-3 send me a square mark
5 send me a line
2-1-2 send me a slate

44
Q

Emergency signals:

222
333
444

A

222 i need you
333 i need me
444 get me off the floor (@ 30’ per sec)

45
Q

Searching signals (s/ circling line):

7
1
2
3
4
A 
7 - signals on/off
1 - stop and search
2 - move forward or back
3 - move right
4 - move left
46
Q

EP’s ascents 3 reasons

A
  • fouled equipment
  • loss of air
  • incapacitated or unconscious diver
47
Q

EP’s free ascent procedure (6)

A

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
Q

EP’s buoyant ascent (6)

A 
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
Q

EP’s Trapped diver (4)

A 
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
Q

EP’s Injured diver (4)

A

approach c/ caution
assess the area for safety
stabilize any injuries and ascend
upon RS start BTLS and notify dive sup

51
Q

EP’s Loss of Air (4)

A

check air supply (air all the way on back a ¼)
check reserve
try 2ndary reg
start buddy breathe

52
Q

EP’s Unconscious diver cause (5)

A 
CO tox
CO2 tox
N2 Narcosis
Entrapment or injury
Disoriented, poor visibility, current
53
Q

EP’s unconscious diver (11)

A 
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
Q

EP’s Lost diver (3)

A 
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
Q

Charging Cylinders:

  • 2 methods
  • rates (wet/dry)
A
  • cascading (fastest)
    HP compressor
  • 400 psig wet
    200 psig dry
56
Q

Cylinders must have a minimum of ___ psi difference to charge.

A

50 psi

57
Q

Operational planning

A

“Plan your Brief, brief you plan”

“Plan your Dive, dive you Plan”

58
Q

Dive sup brief check list (12)

A 
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
Q

Hazards (8)

A 
current
visibility (above and below the surface)
temp
contaminated H2O
under H2O obstacles
sonar
DML
vessels/boat traffic
60
Q

EP’s (6)

A 
Unconscious diver
trapped diver
loss of air
injured diver
lost diver
aborted dive

DMT (15 decks)

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