Brainscape's Knowledge GenomeTM

Browse over 1 million classes created by top students, professors, publishers, and experts.


See full index

19-40-1C > Mixed Gas Diving Supervisor > Flashcards

Mixed Gas Diving Supervisor Flashcards

Familiarize with the procedural steps of conducting a mixed gas dive as a Diving Supervisor

1
Q

What stations shall be manned by formally (NDSTC) tained mixed gas diver

A
  • Diving Officer
  • Master Diver
  • Diving supervisor
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
2
Q

What stations shall be manned by formally trained (NDSTC) surface supplied diver

A

  • Diver
  • Standby Diver
  • Rack operator
  • Console operator
  • Timekeeper/Recprder (Logs)
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
3
Q

What positions can you use a non-diver

A

  • Tender
  • Standby Tender
  • Winch Operator
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

When is a Diving Medico Officer (UMO) required to be on the side?

A
  • All planned exceptional exposure dives
  • Dives planned to exceed normal working limits
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
5
Q

Is a Master Diver and Dive Medical Technition (DMT) required on dive station for mixed gas operations

A

Yes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

What is the Surface Supplied HeO2 Diving Minimum Equipment

A
  • MK 21 MOD 1 or KM-37NS with umbilical
  • Thermal protection
  • Hot water suit - Wet suit - Dry suit
  • Weight belt (If required)
  • Dive Knife
  • Fins or boots
  • EGS w/ submersible tank presure gage
  • Surface supplied diving harness
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
7
Q

What are the normal operational limit for surface supplied mixed gas

A

300 FSW for 30 Minutes

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
8
Q

How much sleep do divers need before mixed gas dive

A

8 hours within the last 24 hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
9
Q

To minimize pulonary O2 tox effects divers should take a ______ break after ______ of diving

A

Take a 1 day** break after **4 consecutive days of diving

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

Is repeative diving allowed in surface supplied helium oxygen diving

A

No

(Exception- dive aborted during decent shallower than 100 FSW)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Following a “No-Decompression Dive” the diver must wait ______ before making a second dive

A

12 Hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Following a decompression dive, divers must wait ______ before a second dive

A

18 Hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Following a no-decompression dive the diver must wait ______ before acent to altitude

A

12 Hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Following a decompression dive, divers must wait ______ before ascent to altitude

A

24 Hours

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Helium has a _____________ wich can cause rapid loss of body and respiratory heat

A

high thermal conductivity

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Helium oxygen mixtures must be analyzed with an instument having an accuracy of _______

A

+/- 0.5 percent

17
Q

Bottom Mixture ranging

A

90/10 He/O2

to

60/40 He/O2

18
Q

50% He / 50% O2 used for what depth and range of mix

A

90 FSW to 40 FSW

49-51%

19
Q

100% O2 is used at what depth

A

Used at in-water SurD

20
Q

What mix is EGS

A

Same as bottom mixture (unless less than 16% O2, then use range from 15-17% O2)

21
Q

What is the maximum oxygen concentration for a diver never shall exceed an O2 partial pressure of ___________ while on bottom

A

1.2 ata (Cut off depth)

22
Q

Descending with < 16% O2

Mixed Gas

A
  • Hat bolth divers on air on the surface
  • Up/Over to 20 fsw
  • Shift to pri BM, vent diver for ::20, leak check
  • BT begins when divers leave 20’ or :05 at 20’
23
Q

Abort Procedures < 100’ or > 100’

Mixed Gas

A
  • Ensure divers are in No “D” status
  • If BM is > 16% O2, ascend to surfaces 30 fpm
  • If BM is < 16% O2, ascend to 20’ shift to air, vent bolth divers, confirm, ascend to surface
  • If aborted < 100’ add BT of all dives to BT of new dive, use deepest depth to calculate T/S
  • If aborted > 100’ no repet dives
24
Q

Light headed or dizzy on bottom

Mixed Gas

A
  • Have diver stop working, vent rig, verify O2 on Analox
  • If bad gas suspected, shift divers/ stby to Sec BM
  • If entire gas supply is suspected, shift to EGS, abort
25
Q

Unconsious diver on the bottom

Mixed Gas

A
  • Verify MMP and O2%
  • Check status of other diver
  • Vent affected diver
  • if bad gas suspected, shift to Sec BM, vent all divers
  • Check for breathing, abort dive
  • Bring diver to first ‘D’ stop, if breathing continue ‘D’
26
Q

Loss of Bottom Mix on the bottom

Mixed Gas

A
  • Shift to Sec BM abort dive
  • If can’t shift to Sec BM, shift to EGS, abort dive
  • at 90 fsw, shift to 50/50, resume decompression
  • If EGS exhausted before 90’, shift to air, shift to 50/50 at 90 fsw, resume decompression
27
Q

Bottom time excess of table

Mixed Gas

A
  • Decompress onthe :120 schedule using DD
  • Shift to 100% O2 at 40 fsw, complete :30
  • Sur ‘D’ up/over to 60’in chamber
  • TT-6 with max extensions
28
Q

Delay to First sop > :01

Mixed Gas

A
  • Round delay up to next whole minute, add to BT
  • Recompute T/S. if no changes, continue deco
  • If change, preform missed stops at current depth, dont go deeper
29
Q

Delay in leaving or arriving at next stop > 90’ > :01

Mixed Gas

A
  • Round delay up, add to BT recompute
  • If no change, continue decompression
  • If change, pick up new schedule, ignore any missed stops/times
30
Q

Delay in leaving or arriving at next stop < 90’ > :01

Mixed Gas

A
  • Can be ignored unless between 90’ -70’
  • Delays > :05 btwn 90’-70’ shift to aire, add any time on air to BT, recompute, if change in schedule, pick up new schedule at current depth, ignore any missed stops/times
31
Q

Loss of 50/50

A
  • Shift to air, continue decompression
  • If fixed, shift back to 50/50, time on air counts
  • If can’t be fixed continue on air to 50 fsw
  • Shift to 100% O2, NTE :16 at 50 fsw
  • If exceeds :16 at 50’ travel to 40’ and add remaining time to 40’ stop time, Sur ‘D’
32
Q

CNS O2 Toxicity (Nonconvulsive) at 90’-60 stops

A
  • Bring divers up 10’ shift to air
  • Vent affected diver, then unaffected diver
  • Remain at stop until previouse stop is made up
  • Continue decompression
  • At next stop, shift back to 50/50, resume decompression
33
Q

CNS O2 Toxicity (Convulsive) at 90’-60’ stops

A
  • Shift to air, vent unaffected diver, than affected
  • Wait for Tonic/Clonic phase
  • If breathing decompress to 50’, shift to 50/50, Sur ‘D’ at completion of 40’ Stop
  • If not breathing reposition airway, if still not, launch stby to assist stricken diver to surface, treat for AGE, leave unaffected in water to complete decompression
34
Q

CNS O2 Toxicity (Nonconculsive) at 50’-40’ stops

A
  • Up 10’, shift to air, vent affected, then inaffected
  • Douvle missed time if on 50/50, triple if on O2
  • Sur ‘D’ after completion of time
  • If Sur ‘D’ is not fesible, continue on Air or O2
  • On O2, at 30’, take a :10 air break, shift to O2, resume deco
  • ON Air, at 30’, tripple stop time
35
Q
A

19-40-1C (5 decks)

Brainscape helps you reach your goals faster, through stronger study habits.
© 2024 Bold Learning Solutions. Terms and Conditions