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49 Cards in this Set

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