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20 Cards in this Set
- Front
- Back
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Describe the oxygen off-effect? |
The off-effect may occur several minutes after the diver comes off gas or experiences a reduction of oxygen partial pressure. The off-effect is manifested by the onset or worsening of CNS oxygen toxicity symptoms.
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What are the symptoms of a chemical injury?
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Symptoms will begin with rapid breathing or headache immediately progressing to choking, gagging, foul taste, and burning of the mouth and throat ("Caustic Cocktail")
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What is the treatment for a chemical injury?
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Assume an upright position, Depress the manual bypass valve continuously and make a controlled ascent to the surface, rinse mouth out with fresh water. Do not induce vomiting and seek medical attention immediately.
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What are the symptoms of middle ear oxygen absorption?
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Pressure or mild discomfort, muffled hearing, a moist crackling sensation
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What are the normal/maximum working limits of the MK-25 Mod 2 UBA?
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Normal working limit - 25 fsw for 240 minutes
Maximum working limit - 50 fsw for 10 minutes |
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When does a diver's excursion time start and end?
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Excursion time is the time between the diver’s initial descent below 20 fsw and his return to 20 fsw or shallower at the end of the excursion.
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Define a successive oxygen dive?
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A successive oxygen dive is one that follows a previous oxygen dive after an Off-Oxygen Interval of less than 2 hours.
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According to the U.S. Navy Dive Manual how long may you leave the CO2 absorbent in an air tight MK-25 MOD 2 rig and still dive the rig?
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14 days
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How many excursions are allowed during a MK-25 MOD 2 UBA dive?
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One
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Name the NAVSEA approved CO2 absorbents?
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High Performance Sodasorb, Regular
Sofnolime 4-8 Mesh NI, Grade L Sofnolime 8-12 Mesh NI, Grade D Divesorb Pro 5-8 Mesh Refer to Table 19-2 |
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What is the maximum oxygen time permitted in a 24 hour period?
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4 hours
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How do you calculate an adjusted oxygen exposure limit for a successive oxygen dive?
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Single Depth Limit - Determine the max O2 time for the deepest exposure, then subtract the O2 time from the previous dive from the maximum O2 time
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What are the restrictions for flying after an oxygen dive?
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Fly immediately unless the O2 dive has been part of a multiple-UBA dive profile where the diver was breathing another mixture (i.e. air, N2O2, or HeO2)
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Where can I find UBA canister duration limits?
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NAVSEA 00C3 ltr 3151 ser 00C34/3160, 27 Sep 01
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What is the primary cause of hypoxia while diving the MK-25 UBA?
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Improper or inadequate purge of the UBA
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What is the difference of the fiberglass (MOD O) and molded urethane (MOD 2) CO2 canisters?
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The urethane (MOD 2) canister can be completly disassembled for cleaning
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Can you use 8-12 mesh absorbent in the fiberglass canister (MOD O)? Yes/ No
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No
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When wearing the MK-25 UBA, where is the red dot located?
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Top left
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What position is the dive/ surface valve in when on bag (oxygen)?
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Up = dive
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Is a DMT/ SOT required for MK-25 closed-circuit diving? T/F
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True (Group One instruction)
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