Scuba 1.0 Flashcards
Normal Working
130
Dives deeper than 130 require what?
CO/OIC Approval
Max Working Limit?
190
Can you perform deco dives?
Yes with CO/OIC approval
What are the requirements for designation as DOD civilian diver?
DOD employee who has been trained at approve US Navy Diving School
Max depth for civilian DOD diver?
130
Requirements for Civilian DOD scuba dive?
- Max 130 feet
- Deco chamber within 5 minutes for any dive deeper than 100 (or outside no-deco limits)
- Manual j valve reserve or independent reserve cylyinder with separate regulator
- submersible pressure guage worn by every diver
- DOD civilians must remain at location of reco chamber for 1 hour after surfacing for dives requiring chamber to be within 5 minutes
When are civilian divers waived from the stringent OSHA requirements
When conducting unique military operations with CO designation letter
Min Equipment for Scuba
OWLD - FSSD
O - open circuit scuba with pressure gauge
W - weight
L - life preserver/BC
D - Dive Knife
F - face mask
S - swim fins
S - submersible watch
D - depth gauge
What is the max current?
1 knot
What is required if current is greater than max?
- ORM analysis
- Tended or witness float
Minimum manning for single diver
4 (sup may use 1 non-diver tender)
- Dive Sup
- Diver
- Diver Tender
- Standby Diver
Who tends the Standby diver in minimum manning?
Supervisor
Who maintains logs in minimum manning?
Supervisor
Minimum manning for Buddy Pair?
4
- Dive Sup
- 2 Divers
- Standby Diver
What is the single greatest practice in Navy SCUBA operations?
Buddy System
Standby Diver Shall:
- Be fully prepared
- Be equipped with octopus
- Receive same briefing
- Remain fully aware
- Stay informed
- Be outfitted with equivalent or greater diving dress
Minimum temperature for Scuba Operations, before it’s considered Ice Diving?
38F
What are the concerns of exceptional exposure dives?
DCS and CNS O2 Tox
Limiting factors of Scuba?
- Increased air consumption due to depth
- Nitrogen narcosis
- Environmental Exposure
What is Scuba primarily used for?
- Shallow water search and inspection
- Light repair and recovery
Dive Sup Responsibilities
- Overall In charge
- Conduct ORM
- Part of mission planning
- Recognize unsafe conditions
Tender Responsibilities?
- CPR, First AID
- Assist Diver
- Line Pull signals
- Track bubble trail
- Observe for unsafe conditions
- Observe witness float
How often do you signal the divers with a line-pull?
Every 2-3 minutes
What type of system does scuba employ when breathing?
Demand
Basic Components of scuba
- Cylinder/Cylinders
- Cylinder valve and manifold assembly
- Demand Regulator assembly
- Harness
What type of pressure is the hose going to the secondary stage regulator?
Low Pressure (INTERMEDIATE HOSE)
What is intermediate pressure?
- Primary regulator is the cause of this by reducing high pressure from the cylinder
- Overbottom pressure (over ambient pressure)
Cylinder material type?
DOT approved steel or aluminum
When must scuba cylinders be inspected?
- Every 12 months
- If water or particulate enters the cylinder
What type cylinders do we use?
Alluminum 100, 3300 working pressure with .47 cu.ft.
What is the burst disc pressure rating?
10% over max cylinder pressure
What must BCs Do?
- Provide min 10 pounds of positive buoyancy at max depth
- Jettisonable weights
- Power inflator
- Oral inflator
- OPRV
3 types of lifelines>
- Tending Line
- Buddy Line
- Float Line
When is a tending line required?
- For standby
- Single Diver
- When direct access to surface is not available
When can a float line be used?
Only when direct access to the surface is available
Minimum size of float line surface float?
11 inches, brightly colored
What is the separation of a buddy line?
6-10 feet
When should you use a buddy line?
Low vis or at night
Materials for lifelines?
*Nylon
*Dacron
*Polypropylene
What is the minimum capacity for an independent air source?
19 scf
Percent in diver’s breathing air?
20-22%
What does duration of air supply depend on>
- Consumption rate
- Depth
- Cylinder capacity
- Delta Temperature
What is the first step for air supply duration calc?
Consumption Rate
CR= ATA x RMV
Second Step of air supply calc?
Available Air Capacity of Cylinder
AC = (Delta P)/14.7 x FV X N
Third step of air supply calc?
Duration of Air Capacity
Duration = AC/CR
What are scuba high pressure charging lines rated to?
3,000 psi
5,000 psi
What is the fastest and most efficient way of charging scuba bottles?
Cascading
How is woking pressure of a hose determined?
1/4 burst pressure
What are strain reliefs made of?
- Cable
- Chain
*21-thread
*3/8in nylon married every 18 inches
What should marrying cord be?
1/8in nylon or material of equivalent strength
Charging rates?
200 dry
400 wet
What are you inspecting on air cylinders?
- Ensure o-ring for cylinder valve is present
- gauge cylinders
- inspect exterior and valves IAW PMS
What are you inspecting on harness?
- Wear and tear on straps and rest of harness
What are you inspecting on hoses?
- cracks, punctures
- check fittings for tightness
What are you inspecting on regulator?
- Check over bottom
- Check for leaks
What are you inspecting on BC?
- Orally inflate and check for leaks
What are you inspecting on mask?
Cracks, wear, seal
What are you inspecting on fins
Straps and blades
What is on the pre-dive inspection?
- divers are ready
- Minimum equipment
- cylinder pressures and air is sufficient
- quick release buckles easy to reach
- weights installed and easily jettisonable
- bc no constrained and free to expand
- knife
- cylinder fully open and back a 1/4
- Hose air passing over right shoulder
- Check 2nd stage for demand air ease
- Final brief
- Dive signals deployed
Max descent speed?
75 fpm
What can skip breathing lead to?
Hypercapnia
Unconsciousness
Death
What is in the lost diver kit
Clump with line and buoy (min 11 inches)
Circling line (min 25 feet)
Lost Diver EP for Diver
- Peform 360 search
- Note max depth and bottom time
- Ascend to surface at 30 fpm with 4 tap intervals on tank
- Continue 360 as ascending
- Inflate BC and notify Dive Sup of depth, bottom time and air remaining
Lost Diver EP for Sup
- Sound recall and post lookouts
- Lower lost diver clump and buoy at last know location
- Initiate search down clump with surfaced diver or standby diver (depended on air remaining and deco status)
- Activate EAP
- Gather additional resources (coastal security)
- Continue search
Trapped Diver EP for Diver
- Remain calm
- Assess the situation
- Carefully work the problem but don’t become part of the problem
- Utilize line pull signals if necessary
- Verify rig vitals and what is needed
- Attach tending line to trapped diver
- If necessary, remove from rig and buddy breathe up
Trapped Diver EP for Supervisor
- Have tools ready (consider sending extra bottle with reg down)
- Ask surfaced buddy trapped diver’s status and rig vitals.
- Ask what he needs
- Make recommendations
- Ask about surfaced buddy’s ascent, max depth, and bottom time. Ensure No-D
- Launch Stdby if needed or current diver
Loss of Air EP for diver
- Check air source and verify valves
- Switch regulators
- Abort and buddy breathe
Unconscious Diver EP for Diver
- Assess
- Reg out, keep out
- Maintain airway
- Check cylinder open
- Ditch weights as needed and bring to surface
- Inflate affected divers BC as needed
- Fully inflate on surface
Unconscious Diver EP for Supervisor
- All divers inflate BCs
- maintain airway
- Assess breathing and 5 rescue breaths if not
- Extract
- Provide BLS
- Transport and implement EAP
Ascent rate
30 fpm
What exception is there to the rule for tending line needed when no direct access to the surface?
EOD searches for Limpet mines but must be used for training
When is decompression diving allowed for scuba?
- Only when absolutely necessary
- Needs CO or OIC approval
How long must divers remain in the vicinity?
2 hours after surfacing within a 30 min drive
Ascent rate from 40 Foot stop to surface?
40 fpm
Uncontrolled ascent with no symptoms?
- Neuro
- Observe for 1 hour
Asymptomatic diver surfaces with 20/30 foot stop missed, what are your options?
- SI Less than 1 minute - go back down and increase stop time by 1 min
- SI 1-7 minutes - (>5 minutes increase O2 time at 50 from :15 to :30)
- SI >7 minutes - TT5 for 2 or fewer, TT6 >2
- If not chamber, return to stop and multiply 30 and 20 foot stops by 1.5
Asymptomatic diver surfaces >30 foot stop missed, what should you do?
TT6
If no chamber, go to first stop and follow schedule all the way to 30 foot stop. Then multiply 30 and 20 foot stops by 1.5
What is the SI for surface decompression?
Time from leaving first stop to arriving in the chamber
What is the recompression rate in the chamber for surface decompression (NOT Treatment TABLE)
100 fpm
What should you do for surface intervals >5 but less than 7?
Increase O2 time at 50 from :15 to :30
What do you do if a diver missed a stop deeper than 50?
165, TT6A
Line pull 5?
send a line
Lne pull 1-2-3
send a square mark
line pull 2-1-2
send a slate
