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Dive Manual, CE
CH. 12 Surface Supplied mix gas Diving
| Question | Answer |
|---|---|
| Normal working depth limit for mixed gas diving | 300 fsw |
| maximum working limit for mixed gas diving | 380 fsw |
| When are exceptional exposure dives authorized for mixed gas? | Only at commanding officer's discretion in an emergency (planned exceptional exposure requires approval by OPNAVINST 3150.27) |
| How long does a diver have to wait to make a second mixed gas dive on a no-decompression dive? | 12 hours |
| How long does a diver have to wait to make a second mixed gas dive on a decompression dive? | 18 hours |
| To minimize pulmonary O2 toxicity effects, a diver should take a ________ break after ________ consecutive days of diving. | 1 day 4 |
| Surface Supplied Mixed Gas side - 1 diver | 12 people: Diving Officer MDV UMO Sup IT/DMT Diver Tender Standby Standby tender comms/logs console rack winch |
| Surface Supplied Mixed Gas side - 2 diver | 14 people: Diving Officer MDV UMO Sup IT/DMT Diver 1 Tender 1 Diver 2 Tender 2 Standby Standby tender Comms/logs Console Rack Winch |
| When can master diver serve as diving officer? | designated in writing by the CO. No one person may serve in more than one position |
| When is UMo required on dive station | Should be present on dive station Required during all planned exceptional exposure dives and dives exceeding normal working limits |
| When is diving officer not required? | conducting no-decompression training dives |
| When is EGS required? | always |
| What is EGS charged with? | Bottom mix, unless bottom mix contains less than 16% O2. In this case EGS mixture should contain 15-17% O2. |
| When diving mixed gas in water temp below ______ degrees F, keeping the diver warm is a life support consideration. | 40 F |
| All mixed gas divers must have ______ hrs of sleep in a 24 hour period | 8 hrs |
| Following a no decompression dive, how long must a diver wait before ascending to altitude? | 12 hours |
| Following a decompression dive, how long must a diver wait before ascent to altitude? | 24 hours |
| Bottom mixture gas percentage | HeO2 ranging from 90/10 to 60/40 |
| Decompression mixture gas percentage | HeO2 50/50 |
| Oxygen concentration in decompression mix may range from ______ to ________. | 49-51% |
| What depth is decompression mix used? | 90-40 fsw during decompression |
| What depths is oxygen used? | 30, 20 fsw in water stops (and during 50,40,30 in chamber for SurD) |
| Instruments used to measure oxygen content in HeO2 mixtures shall be accurate to _________ percent | 0.5 % |
| FMGS supports dive missions up to ________ fsw | 300 |
| Five gas rack assemblies of FMGS | 1xOSRA 1xASRA 3xHOSRA |
| What is used to charge OSRA and HOSRA | Booster pump assemblies |
| Bottom mix is selected to provide what partial pressure of oxygen at the desired depth of the dive? | 1.3 ppO2 |
| What is the minimum oxygen percentage allowed for depths to 200 fsw? | 14% |
| What is the minimum oxygen percentage allowed for depths deeper than 200 fsw? | 10% |
| Pneumofathometer correction factors | 0-100 fsw: +1 101-200fsw: +2 201-300fsw: +4 301-400fsw: +7 |
| ascent rate | 30 fpm 20-40 fpm allowed |
| descent rate | not to exceed 75 fpm |
| ascent rate surD from 40 fsw in water | 40fpm |
| when do stop times begin and end | -When arrived at first stop and after leaving first stop -All subsequent stops, stop time is included in the ascent from previous stop. -O2 stop at 30 fsw begins when divers confirmed on O2 |
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DivingKnowledge