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XLDS AIR SUP QUESTIONS > AIR SUPPLY > Flashcards

AIR SUPPLY Flashcards

1
Q

What is ASYMPTOMATIC OMITTED DECOMPRESSION?

A

• When a diver misses the required decompression stop according to T/S but does not show any symptoms.
* uncontrolled ascent No D table, surface interval none- Observe on surface for an hour. Neuro.
* 30’/20’ :01 chamber available, multiply 30’/20’ Air/O2 stop time by 1.5
• :01 to :07 Use Surface Decompression
• :> :07 TT5 2 or fewer Sur D02 periods/ TT6 > 2 Sur D02 periods
• >30’: Any surface interval do TT6.
: If Chamber not available, descend to 1st stop. Follow schedule to 30’, switch to
O2 if available. Multiply 30’/20’ Air/O2 by 1.5

  • Note 1: Surface Interval begins leaving stop in water to arrive at depth in Chamber.
  • Note 2: Recompression Chamber is strongly recommended over In water decompression. Compress as fast as possible not to exceed 100fpm.
  • Note 3: Surface interval is :05 less than equal to :07, add :15 to :30 at 50’ in chamber.
  • Note 4: If diver missed stop deeper than 50’, compress to 165’ and do TT6A.
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2
Q

What is SYMPTOMATIC OMITTED DECOMPRESSION?

A
  • When a diver misses the required decompression stop but shows symptoms.
  • Chamber available, compress to 60’ and conduct rapid assessment.
  • If 50’ or shallower, do TT6
  • Or depth of relief where symptoms are significantly improved not to exceed 165’- TT6A
  • Uncontrolled ascent >165’, contact DMO- TT8
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3
Q

What are the (3) decompression tables?

A
  • In water air
  • In water air/o2
  • Surface decompression
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4
Q

What is In Water Air Decompression?

A

• Most suitable mode for dives that do not require more than :15 of total decompression stop time.

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5
Q

When to use In Water Air Decompression?

A

• last resort
• only used if not chamber is on site w/in 12-24hrs
• symptoms are significant
• Prior to recompressing in water, have patient breathe on surface O2 for :30 before committing to in water decompression.
• If stabilized after O2, do not compress in water even if signs and symptoms show after O2.
• Continue 100% O2 up to 12Hrs or until supplies last, air breaks when needed.
• If after :30 and no signs of improvement, conduct in water decompression. (caution: water temp and hypothermia).
• TREATMENT: follow TT1A as close as possible.
o Use MK20 or helmet
o Never use scuba open circuit unless it’s the only source.
o Maintain constant comms.
o Keep stby w/ diver
o Plan for shifting hats and cylinders
o Ample tenders top side
o If to shallow and cannot follow depth of TT1A, go as deep as you can attain.
o Remain :30
o Decompress using TT1A.

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6
Q

What is in water air/ o2 decompression?

A

• strongly recommended whenever the total deco on air exceeds :15 and surface deco on o2 is not a viable alternative.

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7
Q

What is surface decompression?

A

• Is a technique where some of the decompression stops in the water are skipped. These stops are made up by compressing the diver back to depth in chamber on the surface.

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8
Q

What is exceptional exposure?

A

• dives in which the risk of DCS, o2 tox and exposure to the elements is substantially greater than a normal working dives.
• Its intended to use ONLY for emergencies such as diver entrapment.
• CNO approval
o dives deeper than 190’
o any in water air/o2 dive greater than :90
o any sur D O2 chamber time greater than :120/ 4 O2 periods

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9
Q

What does it mean when you see In water air deco table does not list a repet grp.?

A
  • Designator for a dive, NO DIVES deeper than 20’ are permitted following this dive.
  • the diver must have an 18hr surface interval before making another dive deeper than 20’.
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10
Q

When depths of 10, 15 and 20’ does not show they have a defined RNT, what does that mean?

A

• it’s undefined because the tissue nitrogen loading associated w/ those repet grps is higher than the nitrogen loading that could be achieved even if the diver were to remain at the those depths for an infinite period of time.

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11
Q

What is the RNT Exception Rule?

A

• sum of bottom times or 2 dives and taking deepest depth.

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12
Q

what are the PNEUMO CORRECTION FACTORS?

A

0-100ft: +1
101 to 200 +2
201 to 300 +4
301 to 400 +7

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13
Q

when to use SHALLOW WATER AIR TABLES?

A

known MD

    • typically UWSH (ballast tank)
    • tables are logged from 30 to 50 feet at 1 ft increments.
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14
Q

what are some common disorders in ALTITUDE DIVING?

A

hypoxia

DCS (flying after diving, = driving over a mountain)

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15
Q

Altitude Diving: cross correction and gauges:

A

1- actual dive must be corrected to determine in SLED
2- deco stops in SLED must be corrected for use of altitude.

mechanical/ electrical gauge most preferred for increasing depth. Can be re zeroed at dive side. once rezeroed, no further correction needed.

most mechanical depth gauges have a sealed one atmosphere reference and cannot be adjusted for altitude. A correction factor of 1fsw for every 1000ft should be added.

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16
Q

when would to use cross correction?

A

0-300ft no correction
300- 1000ft - dives deeper than 145ft.
>1000ft- all dives

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17
Q

when using recompression chamber for decompression, what would you do to the depth gauges before conducting SurD?

A

zero the gauges.

18
Q

correction factor on pneumo’s:

A

can be used at altitude. correction factor to the depth reading before using the SLED. pneumo correction factors are unchanged at altitude.

19
Q

SSD: PRIMARY AND SECONDARY AIR:

A

SSD must include primary and secondary air supply IAW. Primary supply must be able to support the air flow and pressure requirements for the diving equipment designated based on your MP, DEPTH.
The capacity rate of designated number of divers for the full duration of the dive.

20
Q

what components does the primary and secondary air consist of?

A

bottom time, max depth, deco time, number of divers, and equipment must be taken into account when sizing supply.

21
Q

what does SECONDARY SUPPLY AIR consist of?

A

must be sized to be able to support recovery for all divers using the equipment and dive profile of primary supply if the primary supply sustains a casualty at the worst case time.

22
Q

PRIMARY AND SECONDARY SUPPLIES CAN BE?

A

either HP bank supplied or compressor supplied.

23
Q

OP’S and EP’S of Air supplies must be?

A

available to support operation of the system and recovery from emergency situation.

24
Q

ALL valves and switches that directly influence air supply SHALL be labeled:

A

DIVER’S AIR SUPPLY- DO NOT TOUCH!

25
Q

where would you look for level of chambers based on bottom time and depth of dive?

A

air diving recompression chamber requirements (table 6-1) pg. 29.

26
Q

DEFINE egs?

A

1- adequately charged scuba cylinder w/ k or j valve 2- first stage reg set no lower than 135psig, relief valve 185 +- over bottom.
3- SPG must be required on first stage regulator.
- sufficient air to bring diver to first deco stop/ surface for NO D dives.

27
Q

what is chamber level 1 and notes?

A

LEVEL 1: U.S navy certified close enough to dive side to support SurD w/in :05 (note 1 and 2)

notes: 1) base on space constraints at site, CO may authorize extension of SI to max :07
2) a non navy chamber may be used to satisfy this requirement if approved in writing by CNO.

28
Q

what is chamber level 2 and notes?

A

Level 2: US navy certified with in 1HR.

note 2: a non navy chamber may be used to satisfy this requirement if approved in writing by CNO.

29
Q

what is chamber level 3 and notes?

A

Level 3: us navy certified with in 6 HR.

notes: 3, 4
3) . a non navy chamber authorized by CO.
4) . under extreme circumstances, when a chamber cannot be reached, w/in 6 HRS, CO can authorize to use nearest approve chamber facility.

30
Q

what are the 5 basic criteria for air supply?

A

1- air shall conform to standards of diving air purity.
2- flow to diver must be sufficient.
3- adequate overbottom pressure
4- adequate air supply to support duration and depth of dive.
5- secondary air supply shall be available SSD.

31
Q

what are the minimum requirements for SSD?

A 
ssd: (5)
dive sup (console/ stby tender/ comm and logs)
divers
stby diver
tender
** 6 or more is highly recommended
32
Q

who are OSHA DIVERS?

A

1- commercial divers contracted by the navy who are not permanent govt employees ARE NOT subject to the provisions.
2- US Navy civilian divers are identified as all permanent navy employees who have been formally trained navy dive school are subj to provisions.

33
Q

(OSHA) : SCUBA diving SHALL NOT be conducted:

A

1- depths deeper than 130’
2- depths deeper than 100’ or outside no deco limits unless chamber is available w/in :05 of location.
3- all scuba cylinders manual J valve or independent cylinder (octo)
4- SPG

34
Q

(OSHA) : SSD SHALL NOT be conducted:

A

1- depth >190’ if bottom time exceed :30
2- depth >220’ regardless of bottom time
3- depth >100’ or outside no deco limits unless chamber available w/ in :05 of location.
4- EGS regardless of depth

35
Q

where does DIVER’s air supply originate from?

A

compressor OR
bank of HP air flasks OR
combination of both

36
Q

what are the requirements of diver’s air supply regardless of source?

A

1- purity
2- adequate volume of breathing
3- rate of flow that properly ventilates the helmet/mask
4- sufficient pressure to overcome the bottom water pressure
5- pressure losses due to flow through the diving hose, fittings, valves.

air supply requirements depends on:
- depth, duration, level of work, # of divers and type of dive system.

37
Q

DELAYS ignored:

A

less than :01

delays leaving a stop or beta stops less than :01

38
Q

DELAYS > :01 deeper than 50fsw

A
  • round up to nearest whole min.
  • add to bottom time and recompute T/S
  • if change in schedule require to go deeper than the current depth, perform any missed stops at diver’s current depth- DO NOT GO DEEPER.
39
Q

DELAYS > :01 less than 50fsw

A
  • round up to nearest whole min.

- add to first stop/ surface.

40
Q

DELAYS > :01 leaving an air stops or beta stops deeper than 50fsw

A
  • add delay to bottom time and recalculate if new schedule is required.
  • pick up new schedule at present stop or subsequent stop if delay occur beta/ stops.
  • ignore anything deeper.

XLDS AIR SUP QUESTIONS (7 decks)

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