Chapter 12,13, 14 Us Navy Dive Manual, Rev 6.

Front 1

Boyles Law

Application to diving

Back 1

At a constant temperature, the Absolute pressure and volume of a gas are inversely proportional.

Flow Requirements, Volume of Bell and depth

Front 2

Charles/ Gay-Lussac's Law

Back 2

At a constant pressure, the volume of a gas is directly proportional to the change in absolute temperature

Front 3

Converting to Absolute Temperatures

Back 3

C + 273 = Kelvin
F + 460 = Rankine

Front 4

Working limits of HeO2 diving?

Back 4

300'/:30
380' w/ CNO authorization

Front 5

A diver exposed to environmental conditions should not be considered for mixed gas diving until

Back 5

Complete rewarming
-Sweating
-Normal pulse
-normal core temp.

Front 6

All HeO2 diving system requirements.

Back 6

Primary / Secondary HeO2 Bottom Mix
- Decompression Mix
- 100% O2
- Emergency Air
* Enough of each to support all divers for duration of dive.

Front 7

Primary Bottom Mix capacity must meet

Back 7

consumption rate of designated divers for duration of dive

Front 8

Secondary Bottom Mix capacity must meet

Back 8

Support recovery of all divers assuming you lost primary immediately prior to completing the planned bottom time and max depth when decompression obligations are the greatest.

Front 9

# of personnel required to conduct HeO2 surface supplied dive ?

Back 9

One Diver - 12
Two Divers - 15

Front 10

What stations must be manned for S/S HeO2 dive?

Back 10

Diving Officer, MDV/Sup, DMT, Diver, STBY, (2)Tenders,
STBY Tender, Console, Comms/Logs, Rackman, Winch

* 2 divers + 1 diver and two tenders for total of 15

Front 11

Which dive station positions must be Mixed Gas trained?

Back 11

Diving Officer, Master Diver, Diving Supervisor

Front 12

Which positions do not have to be divers on HeO2 dives?

Back 12

Winch Operators, Tenders, Stby Tender.
* Must be thoroughly trained of in required duties.

Front 13

Can a MDV serve as Diving Officer during HeO2 dives?

Back 13

YES, if in writing by CO.

Front 14

When must a DMO be required on station?

Back 14

All exceptional exposure dives and dives exceeding the equipment normal working limits.

Front 15

All divers making an HeO2 dive must have ____ of sleep w/in last ____ before diving?

Back 15

- 8 hours of sleep w/in last 24 hours before diving

Front 16

Is repet diving allowed in HeO2 diving?

Back 16

No, unless following abort procedures 100 fsw or less.

Front 17

Following No D' dive, a diver must wait ____ hours to dive again.
Following Decompression dive?

Back 17

-12 hrs No-D
-18 hrs D'

Front 18

Divers should take ____ day/s break after ____ consecutive days of diving?

Back 18

1 day for every 4 consecutive days of diving.

Front 19

Ascent to Altitude following an HeO2 dive
No D' dive?
D' dive?

Back 19

No-D' - 12 hrs
D' - 24 hrs

Front 20

Gas Mixture ranges
Bottom Mix ?
50/50 Mix ?

Back 20

B/M - 60/40 --- 90/10 He / O2
50/50 - 49% - 51%

Front 21

HeO2 Mixes are analyzed for ____ content w/ instrument having accuracy of ______?

Back 21

O2 content
+/- .5% accuracy

Front 22

EGS requirements for HeO2 dives.

Back 22

All dives
Same as BM unless BM is less than 16% O2, then EGS bottle may range from 15-17%.
- ANU approved cylinder
- Enough pressure/gas to bring diver to 1st stop or surface on No D' dive.
- Pressure Gauge
- Reserve down or K valve
- Relief set @ 180 +/- 5 psi O/B

Front 23

Bottom Mix minimum O2 %

Max ppO2 range

Back 23

O2% 0-200fsw- 14% minimum
201 & < - 10% minimum

* Max ppO2 is 1.3 ata

Front 24

ppO2 calculation for depth?

Back 24

1.3
--------------
ATA -1 X 33 *(% of gas in decimal)

Front 25

When planning for HeO2 diving operations you want to dive w/ mixture near _____ _____ which offers a _____ _____ ?

Back 25

- max O2 percentage
- decompression advantage
* keep the B/M as close to 1.3ppO2 as possible without going over

Front 26

Pneumo correction factors

Back 26

0-100 fsw +1
101-200 fsw + 2
201-300 fsw + 4
301 & < fsw + 7

Front 27

Time at first Decompression stop begins and ends when?

Back 27

Begins when diver/s arrive at stop and planned travel time ends. * don't punch watches until travel time is up if arriving stop early!

Front 28

All stop times except first stop and 1st O2 stop begin and end when?

Back 28

Begins when leaving previous stop and ends when leaving current stop.

Front 29

When does the first O2 stop begin?

Back 29

When all divers are confirmed on O2 and ends when leaving stop.

Front 30

Surface decompression can be used when?

Back 30

After completing the 40' stop

Front 31

When do you shift to 50/50?

Back 31

Shift at 90' or when passing through 90'. Do not ventilate until reaching 1st stop after shifting though.

Front 32

Procedure on descent when Bottom Mix is less than 16% ?

Back 32

- Put divers on air
- In water checks
- Descend to 20', Shift to B/M and ventilate.
- Confirm on B/M- final leak check.
* If 0-20' shift/vent time is less than :05 then start Bottom Time when leaving 20'. If 0-20' shift/vent time is longer than :05, then start Bottom Time at the :05 mark.

Front 33

When performing In-water checks at 20' and problem (leaks) happen, what is the procedure to come out.

Back 33

- Shift back to Air/ Ventilate and bring out of water.
* :05 Grace period starts over for in-water checks at 20'.

Front 34

Aborting Mixed Gas dive procedure?

Back 34

- Ensure in No D' status
- Ascend to 20' / shift to air / ventilate if BM is less than 16%.
- Confirm on air
- Ascend
* If dive was 100' or less than repet OK.
*- Greater than 100' cannot repet.

Front 35

When do you not shift to 50/50 when passing 90'?

Back 35

On No D' dives

Front 36

When do the divers ventilate on 50/50 ?

Back 36

When reaching 1st stop
* Gas shift time is included in stop time.

Front 37

In water periods are ____ min?

Air breaks are ____ min

Back 37

:30
:05

Front 38

When do you not have to take an air break while breathing 100% O2 in water

Back 38

- If total time of O2 is less than :35 or less or
- if Final O2 period is :35 or less then final air break is not required.

Front 39

1st O2 period in chamber is taken what depth/s ?
2nd, 3rd, 4th O2 periods ?
5th, 6th, 7th, 8th O2 periods ?

Back 39

:15 at 50' then :15 at 40'

- 40'
- 30'

Front 40

When can the Dive Sup initiate Sur D under normal conditions?

Back 40

- Any time after completing the 40' stop.

Front 41

Procedure on ascent if you arrive early to 1st decompression stop ?

Back 41

- Go ahead and shift / ventilate but do not start stop time until required travel time is complete.

Front 42

Delay in arriving first stop ?

Back 42

<:01 - Ignore
>:01 - Add total delay / round up to nearest minute, add to BT / recompute / if T/S changes add stop times of deeper stops to current stop.
* Do not go deeper.

Front 43

Delay leaving stop or arrival to next stop when deeper than 90'?

Back 43

< :01 - Ignore
> :01 - Add total delay to BT / recompute / Pick up new T/S at present stop.
* If delay occurs between stops restart the stop time at subsequent stop after completion of delay.

Front 44

Delay leaving stop or arrival to next stop when 90' and Shallower?

Back 44

Nothing required unless between 70-90' then Shift to Air at :05. Add time on Air to BT and recompute T/S, if T/S changes pick up @ present stop or subsequent stop

Front 45

Delay leaving 30' stop ?

Back 45

> :01 - leaving 30' - subtract from 20' stop time.
* After :01 just start the 20' stop time.

Front 46

Procedure if BT is in excess of Table ?

Back 46

- Contact NEDU for D' procedure. If they cannot be reached then:
- use :120 schedule for decompressing
- Shift to O2 at 40' for :30 (time starts when confirmed on O2)
- Sur D
- Press to 60' nte 100fpm
- TX on TT-6 w/ max extensions at 60' & 30'

Front 47

Loss of HeO2 / BM on bottom

Back 47

Shift if available - Abort dive
Otherwise: Shift to EGS until arriving 90'. If EGS runs out before 90' / shift to air. At 90' shift to 50/50. Complete Decompression

Front 48

Loss of 50/50 during decompression ?

Back 48

Shift to Air - correct problem / shift back to 50/50 / time on air counts towards Decompression.
If cannot get 50/50 back:
- Continue D' on air
- Shift to 100% O2 at 50'
- Spend no more than :16 at 50' then make up rest of 50' stop time at 40' stop.
- Sur D' at completion of 40' stop.

Front 49

Loss of O2 during In-Water Decompression ?

Back 49

- Shift to 50/50
- Fix problem - shift back to O2 / resume at point of interruption.
- Cannot fix : Sur D'
- Cannot Sur D'
- Complete on 50/50 or Air / double or triple remaining stop times.

Front 50

Loss of O2 in chamber during Sur D' ?

Back 50

Temporary - Resume at Point of interruption.
Permanent - use 50/50 or Air.
Double or Triple remaining O2 time and allocate
10% at 40' If at 30' then
20% at 30' 30% at 30'
70% at 20' 70% at 20'

* If at 50' then ascend to 40'

Front 51

Procecdure for 50/50 Gas contamination during decompression ?

Back 51

- Find source (EGS open, cross connect on console) etc..
- Correct
-Ventilate ::20 each
- Do not lengthen stop times to compensate.

Front 52

Two differences between HeO2 diving and Air diving when diving at Altitude?

Back 52

- Cannot use Table 9-5 or Fig 9-15 for repeting. Diver must wait 12 hours after arrival at altitude before diving.
- No repets except abort procedure 100' or less.

Front 53

CNS O2 Tox NON-convulsive 90-60' ?

Back 53

Up 10' / Shift to air during travel / Ventilate Affected diver first then unaffected diver.
- Resume D' on air - make up missed stop time from previous depth at current depth along with normal stop time.
- Travel 10' then return both divers on 50/50.

Front 54

CNS O2 Convulsion 90-60' ?

Back 54

- Shift to Air / Tight tend on diver / Launch STBY if needed.
- Ventilate Unaffected diver 1st then have him vent affected diver.
- Hold until Tonic / Clonic phase is over.
- If Breathing: Decompress on Air on schedule then go on 50/50 at 50'
- Sur D' at completion of 40' stop.
- NOT Breathing: Bring stricken diver and Stby up & TX for AGE.
* Make sure diver is not breathing before deciding to bring up/over.

Front 55

CNS O2 Tox NON-convulsive at 50-40 stops ?

Back 55

Up 10' and shift during travel
Vent affected diver 1st then unaffected.
Double missed 50/50 time or triple if diver/s were on O2.
Sur D @ completion of 40' stop time or :
Can't Sur D' :
- Ascend to 30' if not there.
- Wait :10 on Air then go on O2 and start stop time or,,
- Stay on air multiply O2 time by 3 or,,
- Do 30' stop time on Air and multiply stop time by 3 then / then travel to 20' and shift to O2 for regular stop time.

Front 56

CNS O2 Convulsion at 50-40' ?

Back 56

Shift to Air / Tight tend on stricken diver / Launch STBY if needed. / Ventilate unaffected diver 1st then have him vent affected diver.
- After Tonic Clonic phase;
Diver is breathing:
- Double remaining 50' 50/50 time or triple O2 time at current depth.
- At completion of 50' stop time / Sur D' and add 40' stop to the 50' stop in chamber.
Cannot Sur D': complete decompression on Air doubling and tripleinng time as necessary.
NOT Breathing: Bring Affected diver and STBY up/over, TX for AGE

Front 57

CNS O2 Tox NON-convulsive at 30-20' stops ?

Back 57

Up 10' and Shift to Air / Vent affected diver 1st then unaffected diver then Sur D'
If Sur D' not possible :
Triple remaining O2.
- If hit happen at 20' , shift to air and triple missed O2 time.

Front 58

CNS O2 Convulsion at 30-20' ?

Back 58

Shift to Air / Vent Unaffected diver 1st, then unaffected. Tight tend / Launch STBY...
After Tonic Clonic phase is over then and diver is Breathing then: Sur D' or triple remaining O2 time.
If NOT Breathing: Bring STBY and Affected diver up/over, TX for AGE.

Front 59

O2 Tox NON-convulsive in chamber ?

Back 59

-1st SX - Off O2 , wait until SX subsides, wait additional :15, go back on O2 at POI.
- 2nd SX or 1st Convulsion - Off O2 wait till diver is relaxed and breathing normal or when SX have subsided, decompress 10' at 1 fpm and resume at POI.
- 3rd SX or 2nd Convulsion - Off O2, multiply remaining time by 3 and allocate:
40' - 10%
30' - 20%
20' - 70%
Of if at 30' already then allocate 30' - 30% and 20' - 70% respectively.

Front 60

Procedure/s for Surface Interval greater > :05 ?

Back 60

> :05 < :07 - Add :15 to 50' stop in chamber.
> :07 - Travel to 60' - TT-5 if 2 or less periods owed in chamber. TT-6 if 3 or more periods owed in chamber.

Front 61

"Safe way out" procedure if diver cannot make it to 50' in chamber during Sur D'

Back 61

- Compress to deepest depth attainable
- Start O2 breathing
- Gradually compress to 30' or 20' if it was the last in-water stop.
- Double # of O2 periods in table at present depth :60 O2 / :15 Air breaks
- Observe on Surface for DCS
- NO Repets

Front 62

Asymptomatic Ommitted Decompression w/ no stops required ?

Back 62

Observe on Surface for 1 hour. Perform initial nuero and one at end of the hour.

Front 63

Asymptomatic Ommitted Decompression from 20' or 30' stop

Back 63

- Sur D' if S/I < :07
- >:07 - TT-5 if 2 or less O2 periods owed in chamber
- >:07 - TT-6 if 3 or more O2 periods owed in chamber

Front 64

Asymptomatic Ommitted Decompression from 40' & 50' stops ?

Back 64

Any S/I - TT-6

Front 65

Asymptomatic Ommitted Decompression 50' and deeper?

Back 65

Any S/I -
<:60 missed D' - 165' and perform TT-6A
> :60 missed D' - Press to depth of dive or deepest depth of chamber, whichever is shallower/ TT-8

Front 66

Symptomatic Omitted Decompression

Back 66

- 50' and shallower - Goto 60' / TT-6 minimum
- Deeper than 50' - Goto 60' or depth where SX signifigantly improved NTE 165' TT-6A or
- Deeper than 50' > :60 missed , press to full depth of dive or deepest of chamber , whichever is shallower / TT-8

Front 67

Causes & Procedure for lightheaded or dizzy diver on the bottom during HeO2 dive?

Back 67

Causes: Hypoxia, Contaminated Gas, IEB, Overworking rig.

Management: Stop work, Ventilate, Check O2% analox, Shift if necessary & Vent / go on EGS & abort. Ask divers questions about descent whether they had pain.

Front 68

Vertigo due to IEB on the bottom ______ to ventilation?

Back 68

Will not respond & may worsen.

Front 69

Unconscious Diver on Bottom during HeO2 dive ?

Back 69

- Verify MMP / O2 %
- Check status of other diver
- Ventilate other diver / have him get with unconscious diver
- Shift if contamination is suspected / Ventilate
- Reposition head / check for breathing over comms and look for bubbles.
If Breathing : bring diver back to stage, not to be rushed, abort and decompress.
NOT breathing : Get to stage continue to reposition head and bring divers to 1st decompression stop, reposition head again while launching STBY and sending him to 1st stop. Bring STBY and unconscious diver to surface and TX for Omitted D'

Front 70

In-Water Decompression sickness during HeO2 dive when deeper than 30'

Back 70

- recompress 10' stay on 50/50 even if deeper than 90'
- 1.5 the stop time or the next shallower time if no time exists on table.
- If SX resolve or stabilize : Decompress to 40' while 1.5 or more to control SX.
- Shift to 100% O2 at 40' for :30 then Sur D' to 60' TT-6.

- If SX worsen after recompressing 10' and diver cannot stay in water, Surface diver w/ STBY and TX 60' or deeper if indicated.

Front 71

In-Water Decompression sickness during HeO2 dive 30' and shallower?

Back 71

- Recompress 10'
- spend :30 at deeper stop
If SX resolve then Sur D' / TT-6

If SX donot resolve then 1.5 each stop or more to control SX - then surface and press to 60' TT-6.

Front 72

Decompression Sickness Type I only during Surface Interval 40' in water to 50' in chamber ?

Back 72

Type I only - Press to 50' conduct neuro on bottom to rule out Type II or AGE. If SX resolve w/in :15 at 50' then add :15 for total of :30 at 50'
* If S/I >:05 or nerological SX found or no resolve of Type I SX w/in :15, then continue to 60'
- TT-5 if 2 or less O2 periods
- TT-6 if 3 or less O2 periods

Front 73

Logging times on HeO2 chart are recorded how:
Times:
Clock:

Back 73

Times: min/sec on right of page.
Clock: Hour/min on left of page