what is the normal working limit for SCUBA?
what is the MAX working limit?
130 fsw
190 fsw w/CO or OIC approval
What are the applications for SCUBA? (3)
shallow water searching
inspections
light repair and recovery
what is the current restriction for SCUBA?
1 knot MAX
*greater than 1 requires ORM analysis - may be approved with buoy tied to diver
In areas with strong currents, schedule work during?
slack water (between tides)
what is the volume/working pressure for
- steel 72’s?
- aluminum 80’s?
- 7 scf/2250 psig
81. 85 scf/3000 psig
How often are cylinders inspected?
5 years pressure test
annually, visual
or if ever at ZERO
Which valve contains a reserve mechanism,?
J-valve (as opposed to K-valve)
Below what temperature is wet suit thermal protection recommended for SCUBA?
what about dry suit?
80F
40F
What are the minimum manning requirements for SCUBA operation?
4: Dive SUP Diver Dive Tender (or Buddy Diver) Standby Diver
What line pull signal is never answered?
444
How often should a tender signal a diver?
every 2-3 minutes
From Tender to Diver: 1 2 3 4 2-1
1 - are you alright? (on ascent, stop) 2 - going down (on ascent, go back down) 3 - standby to come up 4 - come up 2-1 I understand or talk to me
From Diver to Tender 1 2 3 4 2-1
1 - I am alright (on descent, stop) 2 - lower or give me slack 3 - take up slack 4 - haul me up 2-1 I undesrtand or talk to me
Special Signals
1-2-3
5
2-1-2
send me a square mark
send me a line
send me a slate
Emergency
2-2-2
4-4-4
I am fouled and need assistance
Haul me up immediately
Searching Signals (without circling line) 7 1 2 3 4
7 - go on (or off) searching signals
1 - stop and search where you are
2 - move away from tender if given slack, move toward tender if strain is taken
3 - face umbilical, take strain, move right
4 - face umbilical, take strain, move left
Searching Signals (with circling line) 7 1 2 3 4
7 - go on (or off) searching signals 1 - stop and search where you are 2 - move away from the weight 3 - face weight, go right 4 - face weight, go left
What are reasons for an emergency free ascent?
what are the EPs?
fouled equipment
loss of air
incap/uncon diver
drop all tools ditch weight belt inflate BC only ditch SCUBA if absolutely necessary exhale continuously to surface with head back and airway open - watch for overhead obstructions notify dive sup immediately
EP for trapped diver (7)
- approach with caution
- assess area for safety
- assess diver
- is diver injured?
- does diver have air and how much?
- what will it take to free diver?
- return to surface and report to Dive Sup
EP for injured diver (4)
- approach with caution
- assess area for safety
- stabilize injury as best you can and ascend to surface at 30fpm
- once at suface start BTLS and notify dive sup
EP for loss of air (5)
- notify buddy
- check air supply (air on, back 1/4 turn)
- check reserve
- try 2ndary reg (octopus) or other air source if available
- buddy breathe and abort dive
What are reasons for unconscious diver? (5_
CO tox CO2 tox N2 narc entrapment/injury disorientation/poor visibility
EP for unconscious diver
- approach with caution
- open airway in [INSERT REG?]
- ensure cylinder valve is on, check air/reserve
- ensure open airway
- 444
- ascend - holding airway open and pressing on chest
- when both heads above surface - fully inflate BC and keep head above water
- yell help and report to dive sup including vitals/tank pressure
EP for lost diver (3)
- Make 360 turn looking for bubbles (note max depth and bottom time)
- ascend, looking for bubbles (if found, follow down to lost diver)
- on surface notify dive sup
