Depth restrictions
Normal: 20 FSW for :240
Max: 50 FSW for :10
Advantages
Stealth
Extended operation duration
Minimum support
Portability
Excellent mobility
Disadvantages
Increased Hazards, CNS 02 tox
Shallow depth
No Comms
Limited thermal Protection
Greater training
Greater expense
Weight
27LBs/Neutral in the water
Cold water weight 61-41 Degrees, below 40
4Lbs
MK 25 3 subsystems
Pneumatic, recirculation, Equipment case/harness
02 clynider specifications
207 bar/3000 psig
410 Litres
fill rate 200 PSI wet or dry
99.5% aviators 02
02 reducer
reduces 02 to 55-75 psig constant pressure
Not servicable by Mk 25 techs
Demand valve
Adds 02 to bag as required when bag is emptied on inhaation
Bypass knob is used for
Purge procedures
Pre-dive
Post dive
EPs
Breathing bag holds approx __ and a max of ___
4 litres, 7 litres
In halation hose has a ____ connected to the end that connects to the mouth piece
1 way valve
Exhalation hose has a ___ fitting and is ___ than the inhalation hose
bayonet, longer
Dive surface valve (DSV) operates ___on, ___off
Up, Down
Soda lime canister consists of 2 types ____ holding 5.75lbs of absorbant, _____ holding 5.56lbs.
Urethane, fiberglass
Moisture trap can hold ___CC of water
200
SECUMAR TSK Life vest is authorized to ___
50 FSW
Secumar weight with bottles
8Lbs
Secumar lifting force with 2400psi @ 50fsw
35Lbs
Secumar has 2 ___ liter cylinders
42
Operational duration of MK25 factors
02 supply, Metabolic consumption, gas loss
Canister duration dependant on _____, swim at a __Knot pace, Classified by Navsea ____ DTG___
Water temp/excercise rate, 1, 3151, 27SEP01
UBA 02 consumption rate
1.3 LPM light work, 2.5 LPM heavy work
Unique Required Equipment
Flare/strobe, whistle, buddy line, depth gauge/compass 1per diver
Change exposure limits
Nedu or DMO
Dive phase Key items
Swim at 20FSW or shallower, Excursion carefully note starting and end time
Transit with excursion (TWE) Depth 1-20 FSW Limit
:240
Transit with excursion (TWE) Depth 21-40 FSW Limit
:15
Transit with excursion (TWE) Depth 41-50 FSW Limit
:05
Single Dive Limit (SDL) 25FSW time
:240
Single Dive Limit (SDL) 30FSW time
:80
Single Dive Limit (SDL) 35FSW time
:25
Single Dive Limit (SDL) 40FSW time
:15
Single Dive Limit (SDL) 50FSW time
:10
Sucessive dive limits - 02 dive following a previous 02 dive within ___ is considered the same dive.
2:00
Sucessive dive limits - 02 dive following a previous 02 dive within ___ is considered intial exposure.
4:00
Maximum exposure to 02 in 24 hour period
:240/4 hours
Rig preperation length
2 weeks from prep until rig is used
absorbant does not need to be changed before second dive,as long as the duration does not exceed____ and is conducted with in ___hours
Duration limits, 24
Mod 0 fiberglass canister cannot be used with ___
Sofnolime 8-12