SCUBA Ops Flashcards
1
Q
DJRS
A
Dive Jump Reporting System
2
Q
Advantages of SCUBA (5)
A
- rapid deployment
- portability
- minimum support
- excellent horizontal and vertical mobility
- minimum bottom disturbances
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.
4
Q
SCUBA applications (3)
A
- shallow H2O searches
- inspections
- light repair & recovery
5
Q
SCUBA equipment is not authorized for use in ___ ___.
A
enclosed spaces
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
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
8
Q
Current restriction for SCUBA
A
1.0 Kt is max acceptible current
> 1.0 Kt requires ORM analysis
9
Q
Most common SCUBA casual is ___.
A
drowning
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
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
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
13
Q
DOT regulates hydrostatic testing of cylinders q ___ years to ___ times the working pressure
A
5yrs
1 ⅔
14
Q
Cylinders must be visually inspected q ___ or when…
A
year or when water/particulate matter is suspected.
15
Q
Backpack must have ___ straps and must be approved on the ___ list
A
quick release
AMU
16
Q
Manifold:
- fx
- check q time before use
A
- delivers HP air from tank to reg
- check o-ring before each use
17
Q
Manifold parts (LOAD PIC)
A
sfasdfasdf
18
Q
Blow out disc:
- __ disc per cylinder
- prevents…
- set to ___% of max capacity
A
- one
- over pressurization
- 10%
19
Q
- Define K valve
- requires…
A
- = kill valve, no reserve
- submersible pressure gauge
20
Q
Define J valve
A
provides 500 psi reserve in the single tanks and 250 per tank c/ doubles
21
Q
Reserve valve must be down when… (3)
A
- charging tanks
- gauging tanks
- breathing on reserve
22
Q
Depth gauge is ____.
A
mandatory
23
Q
Protective clothing fx (2)
A
chaff gear and warmth
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.
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
```
