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Dive Physics 2 > Dive Physics 2 > Flashcards

Dive Physics 2 Flashcards

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1
Q

Descent Time

A

-Total elapsed time from when the divers LEAVE the SURFACE to the time when they REACH the BOTTOM

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2
Q

Max rate of Descent

A
  • 75 feet per minute max

- Round to next nearest whole minute (ex. 53 fsw = 43 seconds = 1 minute)

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3
Q

Bottom Time

A

(BT)

  • Total elapsed time from when the divers LEAVE the SURFACE to the time they LEAVE the BOTTOM
  • Round to the nearest whole minute
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4
Q

Total Decompression Time

A

(TDT)

-Total elapsed time from the time the diver LEAVES the BOTTOM to the time they ARRIVE on SURFACE

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5
Q

Max Ascent Rate

A
  • 30 fpm
  • 1 ft / 2 seconds
  • Time needed to “off-gas”
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6
Q

Decompression Table

A
  • Structured set of decompression schedules or limits

- Organized in order of increasing bottom times and depths

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7
Q

Decompression Schedules

A
  • Specific decompression procedure for a combination of DEPTH and BOTTOM TIME
  • Indicated as feet/minutes
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8
Q

Decompression Stop

A
  • Specified depth a diver must remain at for a specified time
  • Eliminates inert gasses from the body
  • “Lets the fizz out”
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9
Q

Deepest Depth

A

-Deepest reading on depth gauge during a dive

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10
Q

Max Depth

A
  • Deepest depth attained after correcting depth gauge for error
  • Max depth is used on decompression table
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11
Q

Scuba Max Depth

A
  • Max depth and deepest depth are the same

- Gauges in scuba are considered error free

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12
Q

Surface-Supplied Max Depth

A
  • Surface Supplied uses “pnneumofathometer” not dive gauge
  • max depth is = deepest reading on pneumo gauge + pneumo correction factor
  • Gauges on surface supplied not considered error free
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13
Q

Unlimited / No decompression Limits

A

(No D)
-Max amount of time that can be spent at a given depth such that safe ascent can be made directly to surface with no stops

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14
Q

Types of Decompression Tables

A

1) Unlimited / No D Limits
- All scuba dives should be here
2) Residual Nitrogen Timetables
- Used for “repet” dives
- RNT
3) Air Decompression Table

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15
Q

Unlimited / No D Table

A

-Identifies that on dives in 20 fsw and shallower, unlimited bottom time can be achieved

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16
Q

Selection of Decompression Schedule

A
  • Select schedule at the EXACT or NEXT LONGER bottom time of the dive
  • Deviations from established decompression procedures are not permitted except in an emergency and with the guidance and recommendation of a Undersea Medical Officer (UMO) and with the CO’s or OIC’s approval
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17
Q

Should you use AIR or AIR/O2 option?

A
  • All SCUBA dives are AIR dives
  • Only Surface supplied dives can deliver 100% O2
  • 100% O2 allows divers to off gas quicker due to lack of N2
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18
Q

Table and Schedule Format; For No D Dive

A

EX. 43 fsw, BT :40

T/S_45/:46, No D, F

19
Q

Table and Schedule Format for Decompression Dive

A

EX. LS 0900, Depth 85’, BT :34

T/S_90/:35, AIR D, :04 STOP @ 20’, J

20
Q

LS

A

Left Surface

21
Q

RB

A

Reached Bottom

22
Q

LB

A

Left Bottom

23
Q

R

A

Reached Stop

24
Q

L

A

Left a Stop

25
Q

RS

A

Reached Surface

26
Q

TBT

A

Total Bottom Time

27
Q

TDT

A

Total Decompression Time

28
Q

TTD

A

Total Time of Dive

29
Q

Variations in Rate of Ascent

A
  • Do not ascend faster than your SMALLEST BUBBLES
  • If ascending faster than 30 fpm, Stop the ascent and allow watches to catch up
  • Disregard delays of 1 minute or less
30
Q

Delays Deeper than 50’

A
  • Round delay up to nearest whole minute and add to the BOTTOM TIME
  • Use new decompression schedule, based off new bottom time
31
Q

Delay Shallower than 50’

A

No D Dive
-Delay is accounted for in the ASCENT TIME
Decompression Dive
-Delay is rounded up to the next whole minute and added to the 1st decompression stop

32
Q

Repetitive Diving Terms

A 
Repetitive Dive (repet)
-Any dive conducted while N2 is still present in the body from a previous dive
Repetitive Group Designator
-Ex. "K" "I" "J"
-closer to "Z" more N2 in body
33
Q

Surface Interval

A

-Time a diver has been on surface following a dive
-Begins as soon as diver surfaces
-Ends as soon as descent for next dive begins
RS - LS = Surface Interval

34
Q

Residual Nitrogen

A
  • N2 that is still in divers tissues after surfacing from a dive
35
Q

Residual Nitrogen Time

A

(RNT)

- Time (minutes) added to the bottom time of repet dive to compensate for nitrogen still in solution in divers body

36
Q

Equivalent Single Dive Time

A

(ESDT)

  • Time in minutes for which a repet dive is selected
  • RNT + BT = ESDT
37
Q

If surface interval is less than 10 minutes what is the procedure?

A

Add bottom times together and use the decompression table for the deeper of the two dive depths

38
Q

RNT Exception Rule

A
  • Occurs when surface interval (SI) between dives is short
  • Recalculate the RNT requirement by summing the 2 bottom times and using the deepest depth
  • Compare to the RNT table/schedule and choose the one with the lesser decompression obligation
  • AKA “Alternative Method”
39
Q

Diving at Altitude

A

Due to reduced atmospheric pressure dives at altitude require MORE decompression than identical dives at sea level

40
Q

Sea Level Equivalent Depth

A

(SLED)
-Gives corrected sea level equivalent depths and equivalent depth stops for dives 10-190 fsw and for altitudes 1000-10000 ft

41
Q

NAVSEA 00C

A

Big bosses
Call if there are any questions not covered
“specific guidance”

42
Q

Altitude Correction Requirements

A

0-300 ft = No correction
300 - 1000 ft = Correct dives deeper than 145
1000 - 10000 ft = Correct all dives
>10000 = Call NAVSEA 00C

43
Q

Flying after Diving

A
  • Ascent to altitude after diving increases risk of DCS
  • More “fizz” is released due to lowered atmospheric pressure
  • Determine SI needed by taking the “highest” repet dive group designator achieved in past 24 hours
  • Commercial flights = 8000 ft
  • If flying below the altitude where a dive was conducted no SI is required

Dive Physics 2 (1 decks)

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