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39 Cards in this Set

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Saturation diving UBA's are designed to operate effectively underwater for at least _____ hrs.?
at least 4 hrs.
*** Diver performance exceptionally decreases between 4 and 6 hours of inwater excursions.
What is an adequate flow of water to the hot water suit?
3 gpm to the suit
1 gpm to the breathing gas heater
Water temperture at the suit inlet should not exceed _____?
Not to exceed 110 degrees
Which personnel shall submit, review, and approve the master protocol?
Submitted: MDV
Reviewed: Sat diving medical officer
Approved: CO
What are the elements of a dive protocol?
- A detailed gas usage plan
- Projected gas supply requirements
- Required mixtures for supplying emergency, treatment and excursion gas.
- Compression schedule
- Planned rate of travel with rest stops
- Manning requirements (watch bill)
- Pre dive and post dive procedures
The hyperbaric atmosphere within the DDC and DB is controlled to maintain the gaseous components at what levels?
ppO2: .44-.48 ata
ppCO2: Less than 0.005 ppCO2 (.5% SEV) (3.8 millimeters of mercury)
Helium and nitrogen: Balance of total pressure
Increases in the PPO2 above 0.6 ata for extended periods (greater than 24 hrs.) risk what?
It risks pulmonary O2 toxicity and it should only be used in emergency situations.
PPO2 below 0.42 ata may result in what?
Results in inadequate decompression
ppO2 below 0.16 ata will reult in what?
Results in hypoxia
Once CO2 concentration reaches _____ SEV for _____ hr. the scrubber canister should be changed?
0.5% SEV for 1 hr.
An inspired CO2 level of _____ SEV can be tolerated for how long?
CO2 level of 2% SEV for periods of up to 4 hrs.
What is the PPO2 range for UBA gas available for use?
0.44 - 1.25 ata
What is the PPO2 range for emergency gas when used as a backup breathing supply in the event of DDC atmosphere contamination?
0.16 - 1.25 ata shall be imediately available to the BIBS
Upward excursions of decompression shall not be started during emergency gas breathing unless the PPO2 of the divers inspired gas is ______ ata of above?
0.42 ata or above
What is the PPO2 range of TX gases that shall be available in the event of decompression sickness?
1.5 - 2.8 ata shall be available
As depth increases, the temperture necessary to achieve comfort may increase to the ______ - _______ degree range?
85 - 93 degrees
What is the general guideline to achieve optimum comfort for all divers?
The temperture should be kept low enough for the warmest diver to be comfortable
What should the relative humidity range be maintained at?
30% - 80% with 50% - 70% being the most desirable range for diver comfort
The fire zone is where the O2 concentration in the chamber is ______% or greater?
6% O2 or greater
With a PPO2 between 0.44 and 0.48 ata, fire is possible at depths less than ______ fsw?
231 fsw (ata x %) / PP
What is an effective preventative regiment for external ear infections?
2% acetic acid in aluminum acetate solution (Domboro) for 5 mins atleast twice daily
What is the air method that will raise the chamber PPO2 to 0.44 ata?
Compress the chamber with air at a moderate rate to 36 fsw. Increase the chamber PPO2 to 0.48 ata by using the O2 makeup system
Rapid compression to saturation storage depth may provoke symptoms of __________?
High pressure nervous syndrome (HPNS) and may intensify compression joint pains
What should Chamber clothing, bed linen, and towels be made of?
100% cotton, diver swim trunks made of 65% polyester 35% cotton material is acceptable
When shall the saturation diving medical officer conduct a brief review of the diver's physical condition?
Within 24 hrs of compression
Saturation compression rates
0-60 fsw _____ - _____
60-250 fsw _____ - _____
250-750 fsw _____ - _____
750-1000 fsw _____ - _____
0 - 60 fsw 0.5 - 30 fsw/min
60 - 250 fsw 0.5 - 10 fsw/min
250 - 750 fsw 0.5 - 3 fsw/min
750 - 1000 fsw 0.5 - 2 fsw/min
What should be done upon completeing a saturation dive?
The chamber shall be well ventilated, emptied, and liberally washed down with non-ionic detergent (MIL-D-16791)
What are the saturation decompression rates?
1600 - 200 fsw = 6 ft/hr
200 -100 fsw = 5 ft/hr
100 - 50 fsw = 4 ft/hr
50 - 0 fsw = 3 ft/hr
What are the abort procedures during compression?
1. Consult with a sat diving medical officer
2. use S/S HeO2 tables
- Depth: use the actual depth
- Bottom time: If the initial compression uses air, time spent shallower than 40 fsw, up to a maximum of 60 mins, is not counted as bottom time. If the initial compression uses helium, time starts when leaving the surface
- BIBS: Maintain BIBS between 1.5 - 2.8 ppO2
- Stops: Follow the scheduled stops of the S/S HeO2 tables
- O2 breaks: For every 25 mins, take a 5 min break. Breaks counts as a stop time. ppO2 shall not be less than 0.16 ata ppO2.
3. Divers shall be observed and monitored for a minimum of 24 hrs after abort decompression.
What are the 2 exceptions to NOT maintaining the DDC chamber atmosphere between 0.44 - 0.48 ata?
- Approximately 1 hr before beginning an upward excursion, the ppO2 may be increased up to a maximum of 0.6 ata to ensure that the ppO2 after excursion does not fall excessively
- The terminal portion of saturation decompression. If the DDC ppO2 were maintained at 0.44 -0.48 ata all the way to the surface, the DDC O2% would rise to 44 - 48%. The allowable O2% is between 19% - 23%.
The terminal portion of decompression cannot exceed _______ O2%?
Shall not exceed 23% based upon fire-risk considerations.
What is the travel rate for an upward excursion?
Upward excursions are 2 fsw/min
Due to the increased risk of decompression sickness an upward excursion for dives with a storage depth of ______ fsw of less, a _____ hr post excursion hold should be utilized?
Storage depth of 200 fsw or less a 2 hr post excursion hold should be utilized.
Decompression traveling stops are a total of ______ hrs out of every ______ hrs?
A total of 8 hrs out of every 24 hrs.
What are rest stops?
8 hr traveling stops divided into 2 periods
What hold may be considered as one of the rest stops?
The 2 hr post excursion hold
How shall type l DCS be treated?
- Sx. within 60 mins of an upward excursion, shall be treated as type ll DCS.
- Sx. greater than 60 mins after an upward excursion or during sat deco.
- recompress in increments of 5 fsw, at 5 fsw/min until distinct improvment
- recompression of more than 30 fsw is usually unnecessary.
- Start Tx. gas 1.5 - 2.8 ata ppO2, :25 on / :05 off
- Continue Tx. gas till Sx resolved
- Remain at Tx. depth at least 2 hrs following resolution of Sx.
- Resume Sat deco. as planned, no further upward excursions authorized
How shall type ll DCS be treated?
- Sx. within 60 mins of an upward excursion, recompress to storage depth at 30 fpm
- Sx. greater than 60 mins after an upward excursion or during sat deco.
- recompress in increments of 5 fsw, at 5 fsw/min until distinct improvment
- If no significant improvment within 10 mins continue recompression at direction of DMO until relief is obtained
- Start Tx. gas 1.5 - 2.8 ata ppO2, :25 on / :05 off
- Continue Tx. gas at least 2 hrs
- Remain at Tx. depth at least 12 hrs following resolution of Sx.
- Resume Sat deco. as planned, no further upward excursions authorized
What are the post dive procedures for the divers?
Immediate vicinity of a chamber for 2 hrs
Within 30 min travel of a chamber for 48 hrs after the dive
Shall not fly for 72 hrs after surfacing