MK 16 System Description

Question 1

What are the 4 major systems of the MK16?

Answer 1

1. Housing
2. Recirculation
3. Electronics
4. Pneumatics

Question 2

What do the 4 major systems do?

Answer 2

Provide constant partial pressure of O2

Question 3

What does the housing subsystem consist of?

Answer 3

• Housing cover assembly
• Lower housing assembly
• Harness assembly/quick attach buckles

Question 4

What does the recirculation subsystem consist of?

Answer 4

• mouthpiece/hose assembly
• Scrubber assembly

Question 5

What does the recirculation system do?

Answer 5

Provides and controls the breathing loop and removes CO2 from the diver’s exhaled gas

Question 6

What does the Electronics subsystem consist of?

Answer 6

• PEA (lithium battery)
• Primary display
• Secondary display
• 3 O2 sensors
• O2 addition valve
• Cables

Question 7

What does the electronics subsystem do?

Answer 7

• Measures and analyzes amount of O2 in the diver’s breathing gas and automatically provides required amount of O2
• 2 separate displays that show the condition of the MK16

Question 8

What does the pnuematics system consist of?

Answer 8

O2 and dil
* Bottle assembly
* regulator
* pressure indcator
*filter
* bypass valve
* addition valve

Question 9

When looking top down with PEA closest to you, where are the inhalation and exhalation connections

Answer 9

Inhalation - right side
Exhalation - left side

Question 10

What side is the O2 bypass valve?

Answer 10

Right side

Question 11

What are the flask FV and pressures?

Answer 11

21 FT3 at 3,000 psig

Question 12

What is the blowout disk rating?

Answer 12

4500 psig

Question 13

What is the discharge life of the primary battery

Answer 13

120 hours

Question 14

What is the operating temp for the MK16

Answer 14

29F - 90F

Question 15

Where can the engineering notes be found for the MK16 EOD and NSW

Answer 15

NSW - PMS 340
EOD - PMS 408

Question 16

What does CSAV stand for?

Answer 16

Combat Swimmer Assault Vest

Question 17

Where are the support screens located in the scrubber assembly?

Answer 17

Directly above and below the canister

Question 18

Describe the path exhaled gas takes within the canister:

Answer 18

1. Exhaled gas travels thru the first moisture absorbent pad
2. Gas travels thru the base of the canister into the first (hydrophobic) filter
   2a. Filter provides uniform gas distribution
3. Then thru the absorbent where CO2 is removed
4. Then thru a compression pad and scrubber
5. Thru the canister lid before flowing thru the upper moisture absorbent pad
6. Then outside the canister into the diaphragm

Question 19

What is the purpose of the diluent addition valve?

Answer 19

Automatically add volume to the breathing loop

Question 20

How does the diaphragm work?

Answer 20

Controls volume of gas in the breathing loop
* when volume in the breathing loop increases, the diaphragm increases in size until it actuates the dump valve
* When volume in the breathing loop decreases, the diaphragm shrinks until the diluent addition valve is actuated

Question 21

How does the PEA communicate?

Answer 21

• Receives signals from 3 O2 sensors that tell it what the PPo2 in the breathing loop is
• PEA tells the Primary the condition of the system
• PEA tells the O2 addition valve when to add
• PEA has a depth sensor to switch between .75 and 1.3

Question 22

What is the error for depth correction to 1.3 PPO2?

Answer 22

+/- 2 at 33FSW
or
+/- 2 above 13 FSW

Question 23

What exactly tells the PEA whether to send a drive signal to open the O2 addition valve or close the addition valve?

Answer 23

If a majority of the O2 sensors are above a predetermined set-point, the PEA tells the addtition valve to close
If a majority of te O2 sensors are below a predetermined set-point, the PEA tells the addition valve to open