Bell Diving Flashcards
(48 cards)
State the Minimum team size for saturation operations
9 men minimum
1 x Dive Sup
2 x LSS
2 x LST
2 x Bell Divers
1 x Surface Stby Diver
1 x Stby Tender
How long is allowed for diver lock outs and bell run (seal to seal)
Diver Lockouts - 6hrs
Bell Run - 8hrs seal to seal
After 2hrs in water divers given opportunity for refreshments.
Saturation durations beyond 28 days are allowed.
True or False
True.
Extensions beyond 28 days are allowed with written agreement from;
-dive contractors medical advisor
-divers in sat
-diving supervisors
For continuous diving operations, how many supervisors are required per shift?
2 Supervisors PER SHIFT in continuous operations
When multiple supervisors are on shift, who is the one in charge?
The one who is signed on in the Diving Operations Logbook
Bell valves do not need to be labeled.
True or False
All bell valves should be clearly labeled both internally and externally.
Bell valves, aside from O2 needle valves, should be of what type?
1/4 turn valves
O2 valves should be needle valves
Who shall control the bell blow down supply
Diving supervisor
Waterproof valve check lists shall be kept where?
In the Bell and Dive control
Photographs should also be kept in dive control as well.
State the minimum amount of OBG for use in emergency on a bell run
30 minutes of breathing gas at 40L/min (1.5ft3) at the maximum working depth.
Plus 24hrs of O2
What is the minimum On Board O2 required for bell diving
Enough O2 for the maximum number of divers to last 24hrs at the end of the bell run.
-consumption based on 0.5L/min
What frequency does a bell transponder operate on?
37.5kHz
Every diving bells required a man hoist to recover a stricken diver
True or False
True
Name 3 commonly monitored gases in a bell
Oxygen
Carbon Dioxide
Hydrogen Sulfide
The emergency bell umbilical usually contains the following services
Breathing Gas
Hot Water
*Comms as an option
Emergency gas and survival supplies must last how many hour in a stranded bell?
24hrs
State 4 methods of communicating with the bell
-Comms Box
-Sound Powered Phone
-Thru Water Comms
-Tapping Code
What is the Max ppCO2 in the bell
See company Manual
5000ppm
What are the main components of the bell handling system
-A-Frame/Trolley and Cursor
-Winch, main cable, guide wires
-umbilical handling system
-secondary recovery system
Optional:
Heave comp
Cross haul
IMCA D050
Minimum gas supplies required for saturation diving
-Sufficient gas to complete the bell run plus same as reserve.
(must not incl OBG)
-Sufficient gas to press all chambers to max intended storage depth plus same as reserve.
(reserve gas must always be on hand)
-Sufficient gas for full decompression from storage depth to surface Twice.
-Sufficient O2 for metabolic consumption and maintaining ppO2 during deco, Doubled.
-3 weeks supply of cal gas.
Maximum ppO2 in bailout bottle
1.4bar maximum
0.4 bar minimum
How many minutes of bailout is required for 48m of umbilical excursion
5mins
1min per 10m
Who is responsible for the TUP operation?
Diving Supervisor
Pressure interlocks help prevent what?
The prevent clamps being open while trunking is under pressure.
