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49 Cards in this Set
- Front
- Back
Describe the MK16 MOD 0.
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The MK16 MOD 0 is a 0.75 ata constant ppO2 closedcircuit mixed-gas underwater breathing apparatus primarily employed by specwar forces.
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What are the maximum working limits for the MK16 MOD 0 UBA?
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The maximum working limits are 150' when N2O2 (air) is used as a diluent or 200 fsw when 84/16 HeO2 mix is used as a diluent.
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How is CO2 absorbent duration directly affected by the temperature and depth?
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Absorbent duration decreases as temperature decreases and depth increases.
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Why must the diver always be aware of CO2 toxicity symptoms?
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Because the MK 16 MOD 0 UBA provides no visual warning of excess CO2 problems.
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In addition to the danger of CO2 toxicity what 2 other potential hazards might a diver encounter?
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The potential hazards of 1)hypoxia and 2) central nervous system (CNS)oxygen toxicity.
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When can Hypoxia occur?
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Hypoxia can occur when there is insufficient oxygen in the recirculation circuit.
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If O2 is not added to the breathing circuit how long will the breathing mixture sustain life?
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A period of 2-5 minutes.
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What are the four basic systems of the MK 16 MOD 0?
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Housing, recirculation,
pneumatics, and electronics. |
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What are the two functions of the CO2 scrubber?
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To remove CO2 and to remove moisture.
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What is the high O2 alarm?
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Flashing green.
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What is the low O2 alarm?
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Flashing red.
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What is the normal operational ppO2 setpoint for the MK 16 MOD 0?
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The normal operational ppO2 setpoint for the MK 16
Mod 0 UBA is 0.75 ata. |
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How many displays does the MK 16 MOD 0 have and what are they for?
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The MK 16 MOD 0 UBA has 2 displays that provide ppO2, battery condition, and oxygen sensor malfunction info.
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What does a steady green light on the primary display indicate?
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A steady green indicates normal oxygen range, 0.60 to 0.90 ata ppO2.
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What does a steady red (or red & green at the same time) light on the primary display indicate?
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A primary electronics failure.
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What does a flashing red light on the primary display indicate?
What does a flashing green light on the primary display indicate? |
Flashing red indicates low oxygen content, less than 0.60 ata ppO2.
Flashing green indicates high oxygen content, greater than 0.90 ata ppO2 |
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What does an alternating red/ green light on the primary display indicate? (4 things)
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A normal transition period, one sensor out of limits, low primary battery power, or primary electronics failure.
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What does no display on the primary mean?
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Primary electronics assembly or primary battery failure.
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How is the secondary display powered?
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The secondary display is powered by four 1.5-volt batteries.
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What is the minimum personnel requirements for MK 16 MOD 0 diving operations?
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The same as open circuit SCUBA, a minimum of 4.
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Workup dives are strongly recommended prior to diving at depths greater than _____ fsw
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130'
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What is required for a diver that has not dove the MK 16 Mod 0 for 6 months or greater? What about decompression dives?
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Refamiliarize himself with the EP's and OP's and conduct a training dive prior to an operational dive. Must do open water decompression training dives.
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What is considered when calculating the endurance of a MK 16 mod 0 dive? What might affect the endurance?
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Oxygen only, but tthings that will affect that are
-Flask FV -Initial pressure -Reserve pressure (500psi to drive the reducer) -Consumption rate -Effects of cold water immersion on flask pressure |
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What is the floodable volmue of the MK16 Mod 0 UBA oxygen flask?
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0.1 cubic feet.
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What is the O2 consumption rate for divers diving the MK16 MOD 0?
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Oxygen consumption by the diver is computed as 0.049 scfm (1.4 lpm) based on a diver swimming at 0.85 knots.
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What is the formula used to figure Rankine?
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Rankine = Temp. (fahrenheit) plus 460
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How much diluent in SCF does the MK 16 MOD 0 hold? (at 3000 psi)
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The MK 16 MOD 0 diluent bottle holds approximately 21 standard cubic feet.
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When would you dive without a budy line?
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Only in situations where their use is not feasible or where their use will pose a greater hazard to the divers such as combat swimmer operations.
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What do you call a budy line over 10' long?
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Any buddy line over 10' in length is called a distance line, the length of a distance line shall not exceed 81' (25 meters).
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Can you use SCUBA as a stand by diver when diving MK 16 MOD 0? If so, how deep?
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Yes, open circuit scuba may be used to a maximum depth of 130 fsw.
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How are MK16 tending lines, marker lines, and lazy-shot lines marked.
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The lines are marked with red and yellow or black bands, starting at the divers end red band indicate 50' and yellow or black bands mark every 10'.
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True or False?
A single depth gauge and wrist watch may be used when diving with a partner. |
True, as long as divers are connected with a budy or distance line.
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What are recompression chamber considerations for diving closed circuit UBAs?
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Recompression chamber and DMO
are not required on station unless the dives will exceed the maximum working limit. |
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What is the max decent rate for the MK 16 MOD 0?
Depending on the depth and rate of descent what will happen with your primary display? |
The maximum descent rate is 60 feet per minute.
Flashing green, can last from 2-15 minutes while additional oxygen is consumed. |
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What does 1 pull from diver to tender mean?
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Arrived at lazy shot (given on lazy shot).
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What does 7 pulls from diver to tender mean?
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I have started, found, or completed work.
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What does 2-3 pulls from diver to tender mean?
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I have decompression symptoms.
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What does 3-2 pulls from diver to tender mean?
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Breathing from EBS.
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What does 4-2 pulls from diver to tender mean?
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Rig Malfunction.
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What does 2-1 pulls from diver/tender to tender/diver mean?
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Unshackle from the lazy shot.
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How often should divers monitor their primary and secondary displays?
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Every 2-3 minutes.
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Why are standard U.S. Navy decompression tables not used when diving closed circuit UBAs?
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Because with a rebreather the ppO2 remains constant at a preset level regardless of depth.
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Is surface decompression used with MK 16 MOD 0 diving?
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No, appropriate surface decompression tables have not been developed for constant ppO2 closed-circuit diving.
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How do you determine MK16 divers decompression obligation? (3 ways)
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1)The Navy Dive Computer (NDC)
2)Constant ppO2 Decompression Tables 3)Combat Swimmer Multilevel Dive Tables |
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What ppO2 should be maintained while decompressing after a MK 16 MOD 0 dive?
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During decompression ensure a 0.75 ppO2 is maintained.
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Without exceptional exposure what is the deepest and longest mission porfile for the MK-16 MOD 0 using N2O2?
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150' for :30
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Without exceptional exposure what is the longest and deepest mission porfile for the MK-16 MOD 1 using HEO2?
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200' for :35
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When is the EBS (emergency breathing system) required?
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When doing planned decompression dives,
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During continuous operations how often are the predives preformed?
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A minimum of every 24 hours.
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