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39 Cards in this Set
- Front
- Back
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Saturation diving UBA's are designed to operate effectively underwater for at least _____ hrs.?
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at least 4 hrs.
*** Diver performance exceptionally decreases between 4 and 6 hours of inwater excursions. |
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What is an adequate flow of water to the hot water suit?
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3 gpm to the suit
1 gpm to the breathing gas heater |
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Water temperture at the suit inlet should not exceed _____?
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Not to exceed 110 degrees
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Which personnel shall submit, review, and approve the master protocol?
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Submitted: MDV
Reviewed: Sat diving medical officer Approved: CO |
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What are the elements of a dive protocol?
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- 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 |
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The hyperbaric atmosphere within the DDC and DB is controlled to maintain the gaseous components at what levels?
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ppO2: .44-.48 ata
ppCO2: Less than 0.005 ppCO2 (.5% SEV) (3.8 millimeters of mercury) Helium and nitrogen: Balance of total pressure |
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Increases in the PPO2 above 0.6 ata for extended periods (greater than 24 hrs.) risk what?
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It risks pulmonary O2 toxicity and it should only be used in emergency situations.
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PPO2 below 0.42 ata may result in what?
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Results in inadequate decompression
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ppO2 below 0.16 ata will reult in what?
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Results in hypoxia
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Once CO2 concentration reaches _____ SEV for _____ hr. the scrubber canister should be changed?
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0.5% SEV for 1 hr.
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An inspired CO2 level of _____ SEV can be tolerated for how long?
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CO2 level of 2% SEV for periods of up to 4 hrs.
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What is the PPO2 range for UBA gas available for use?
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0.44 - 1.25 ata
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What is the PPO2 range for emergency gas when used as a backup breathing supply in the event of DDC atmosphere contamination?
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0.16 - 1.25 ata shall be imediately available to the BIBS
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Upward excursions of decompression shall not be started during emergency gas breathing unless the PPO2 of the divers inspired gas is ______ ata of above?
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0.42 ata or above
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What is the PPO2 range of TX gases that shall be available in the event of decompression sickness?
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1.5 - 2.8 ata shall be available
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As depth increases, the temperture necessary to achieve comfort may increase to the ______ - _______ degree range?
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85 - 93 degrees
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What is the general guideline to achieve optimum comfort for all divers?
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The temperture should be kept low enough for the warmest diver to be comfortable
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What should the relative humidity range be maintained at?
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30% - 80% with 50% - 70% being the most desirable range for diver comfort
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The fire zone is where the O2 concentration in the chamber is ______% or greater?
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6% O2 or greater
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With a PPO2 between 0.44 and 0.48 ata, fire is possible at depths less than ______ fsw?
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231 fsw (ata x %) / PP
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What is an effective preventative regiment for external ear infections?
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2% acetic acid in aluminum acetate solution (Domboro) for 5 mins atleast twice daily
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What is the air method that will raise the chamber PPO2 to 0.44 ata?
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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
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Rapid compression to saturation storage depth may provoke symptoms of __________?
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High pressure nervous syndrome (HPNS) and may intensify compression joint pains
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What should Chamber clothing, bed linen, and towels be made of?
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100% cotton, diver swim trunks made of 65% polyester 35% cotton material is acceptable
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When shall the saturation diving medical officer conduct a brief review of the diver's physical condition?
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Within 24 hrs of compression
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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 |
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What should be done upon completeing a saturation dive?
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The chamber shall be well ventilated, emptied, and liberally washed down with non-ionic detergent (MIL-D-16791)
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What are the saturation decompression rates?
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1600 - 200 fsw = 6 ft/hr
200 -100 fsw = 5 ft/hr 100 - 50 fsw = 4 ft/hr 50 - 0 fsw = 3 ft/hr |
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What are the abort procedures during compression?
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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. |
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What are the 2 exceptions to NOT maintaining the DDC chamber atmosphere between 0.44 - 0.48 ata?
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- 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%. |
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The terminal portion of decompression cannot exceed _______ O2%?
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Shall not exceed 23% based upon fire-risk considerations.
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What is the travel rate for an upward excursion?
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Upward excursions are 2 fsw/min
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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?
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Storage depth of 200 fsw or less a 2 hr post excursion hold should be utilized.
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Decompression traveling stops are a total of ______ hrs out of every ______ hrs?
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A total of 8 hrs out of every 24 hrs.
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What are rest stops?
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8 hr traveling stops divided into 2 periods
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What hold may be considered as one of the rest stops?
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The 2 hr post excursion hold
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How shall type l DCS be treated?
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- 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 |
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How shall type ll DCS be treated?
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- 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 |
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What are the post dive procedures for the divers?
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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 |
