SCUBA Ops Flashcards
DJRS
Dive Jump Reporting System
Advantages of SCUBA (5)
- rapid deployment
- portability
- minimum support
- excellent horizontal and vertical mobility
- minimum bottom disturbances
Disadvantages of SCUBA (4)
- 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.
SCUBA applications (3)
- shallow H2O searches
- inspections
- light repair & recovery
SCUBA equipment is not authorized for use in ___ ___.
enclosed spaces
Operational depth restrictions for SCUBA:
- normal working limits
- max working limits… c/
- 130 fsw
- 190 fsw c/ CO or OIC’s permission
SCUBA restrictions:
- working diver
- standby diver
- time (2)
- 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
Current restriction for SCUBA
1.0 Kt is max acceptible current
> 1.0 Kt requires ORM analysis
Most common SCUBA casual is ___.
drowning
SCUBA major components (12)
1st stage regulator cylinder backpack manifold depth gauge chaffing gear weight belt knife LP/BC cylinder pressure gauge watch fins mask
Single Hose Reg fx of:
- 1st stage
- intermediate hose
- 2nd stage
- 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
Cylinders:
- made of two types of metal
- working pressures
- volume
- steel or Al
- Steel 2250 psig
Al 3000 psig - Steel ‘72’ = 64.7 scf @ 2250 psig
AL ‘80’ = 81.25 scf @ 3000 psig
DOT regulates hydrostatic testing of cylinders q ___ years to ___ times the working pressure
5yrs
1 ⅔
Cylinders must be visually inspected q ___ or when…
year or when water/particulate matter is suspected.
Backpack must have ___ straps and must be approved on the ___ list
quick release
AMU
Manifold:
- fx
- check q time before use
- delivers HP air from tank to reg
- check o-ring before each use
Manifold parts (LOAD PIC)
sfasdfasdf
Blow out disc:
- __ disc per cylinder
- prevents…
- set to ___% of max capacity
- one
- over pressurization
- 10%
- Define K valve
- requires…
- = kill valve, no reserve
- submersible pressure gauge
Define J valve
provides 500 psi reserve in the single tanks and 250 per tank c/ doubles
Reserve valve must be down when… (3)
- charging tanks
- gauging tanks
- breathing on reserve
Depth gauge is ____.
mandatory
Protective clothing fx (2)
chaff gear and warmth
VVDS
- defined
- required when
- Variable Volume Dry Suit
- USN requires special cold wx gear c/ diving in temps < 37F. Will need extra weights too.
Weight belt must have ___.
quick release
Knife is ___. Never wear on ….
mandatory
on anything that will be ditched in an emergency.
LP/BC is mandatory except
under ice
- prevents trauma during a blowup or uncontrolled ascent
LP (2)
- must have an oral inflator
- keeps diver face up
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
CO2 carts must have (2)
gross wt inscribed
PMS before each use
Cylinder pressure gauge calibrated q ___ months
18 months
Watch is ___.
mandatory
Octopus reg is mandatory for ___ divers
standby
SCUBA optional equipment (9)
UDT, chaff gear, VVDS submersible pressure gauge (only c/ J valve) signal flare compass whistle slate snorkel light line
SCUBA manning requirements:
- single SCUBA diver
- 2 SCUBA divers
- 4 (dive sup, diver, tender, stbdy)
- 3 (dive sup, 2 divers, tender)
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
All line pull signals are answered except
4
4-4-4
Tender should signal a diver q ___ to ___ mins and…
2-3 mins and inform the Div sup c/ each message.
Failure to respond to line pulls = (3)
- fouled line
- too much slack
- diver is in trouble
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
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
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
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
Emergency signals:
222
333
444
222 i need you
333 i need me
444 get me off the floor (@ 30’ per sec)
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
EP’s ascents 3 reasons
- fouled equipment
- loss of air
- incapacitated or unconscious diver
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
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
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
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
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
EP’s Unconscious diver cause (5)
CO tox CO2 tox N2 Narcosis Entrapment or injury Disoriented, poor visibility, current
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
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
Charging Cylinders:
- 2 methods
- rates (wet/dry)
- cascading (fastest)
HP compressor - 400 psig wet
200 psig dry
Cylinders must have a minimum of ___ psi difference to charge.
50 psi
Operational planning
“Plan your Brief, brief you plan”
“Plan your Dive, dive you Plan”
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
Hazards (8)
current visibility (above and below the surface) temp contaminated H2O under H2O obstacles sonar DML vessels/boat traffic
EP’s (6)
Unconscious diver trapped diver loss of air injured diver lost diver aborted dive
