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Air/Sat Sups IMCA Revision > Various > Flashcards

Various Flashcards

1
Q

1 Litre of seawater weighs ?

A

1.03kg

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2
Q

Litre of fresh water

A

1kg

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3
Q

1 Cubic foot seawater weighs?

A

64.38lbs

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4
Q

Cubic foot of fresh water

A

62.5lbs

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5
Q

Upthrust =

A

Volume x density

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6
Q

Density=

A

Mass/Volume

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7
Q

Atmospheric imperial ATA=

A

14.7psi 760mm of mercury mmHg

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8
Q

Atmospheric metric bar abs=

A

14.5psi 750mmHg mercury

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9
Q

Barometric pressure is?

A

Essentially same as atmospheric, but varying with weather and expressed in terms height column mercury

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10
Q

Gauge pressure is?

A

Starts at Zero when read on surface at atmospheric pressure

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11
Q

Absolute pressure is?

A

Total pressure exerted , gauge pressure plus atmospheric

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12
Q

Seawater m3 density

A

1030kg/m3

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13
Q

Fresh water density m3

A

1000kg/m3

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14
Q

3 types of Heat transfer

A

Conduction, main cause heat loss.

Convection
Radiation

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15
Q

Water conducts heat

A

24 more times more than air

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16
Q

Sound travels in water….

A

4 times faster than in air

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17
Q

Fahrenheit to absolute temp

A

Rankin = F + 460

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18
Q

Celsius to absolute temperature

A

Kelvin = Celsius + 273

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19
Q

Fahrenheit to C =

A

F -32/1.8

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20
Q

Celsius to Fahrenheit

A

C x 1.8 + 32

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21
Q

Normal diver consumption rate

A

35LPM/ 1.25ft3

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22
Q

Emergency consumption rate

A

40LPM/1.5ft3 min

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23
Q

Formula for finding absolute pressure metric measurements

A

Depth MSW/10+1

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24
Q

Formula for finding FGV WHEN FV is unknown

A

Vol full X Avail press
press full

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25
FGV WHEN FV Known
FGV = PRESSURE X VOLUME
26
Litres to one ft3
28.32 litres
27
Imperial ton lbs?
2240lbs
28
1 US TON LBS?
2000lbs
29
1fsw is how many PSI?
0.445psi
30
FSW/? = MSW
3.281
31
Reclaim gas usage
5 LPM OR 0.18ft3/min
32
Chamber BIBS CONSUMPTION in LPM AND ft3/min?
20 LPM OR 0.7ft3/min
33
Metabolic O2 consumption metric imca D050
0.5LPM, 30 LPH, 720per day 0.72m3
34
Metabolic 02 consumption imperial
0.018ft3/min 25ft3/day per diver
35
Cubic feet in one cubic metre?
35.32 cubic feet
36
PPM TO %
Divide by 10’000
37
% to PPM
Multiply by 10’000
38
PPM TO PP
Divide by 1000’000
39
PP to PPM
X 1’000’000
40
% to PP
% divided by 100
41
PP TO %
PP X 100
42
Partial Pressure(mb) =
Absolute depth (MSW) x %
43
EAD FORMULA FPS
N2% x ABS DEPTH/79-33
44
EAD FORMULA METRIC
N2% X ABS DEPTH/79-10
45
FINAL DEPTH =
46
Max co2 ppm?
5000ppm Co2 0.5% 5mb 0.005 bar
47
General gas law
P1xV1 = P2xV2 T1. T2
48
1kg Soda lime absorbs ?
120 Litres co2
49
1kg soda lime last a diver how long?
1kg 4hours
50
Alternative formula for PP in mb?
Pp(mb) = ABS depth X %, not decimal %
51
Adding o2 to the chamber ppo2 increases by:
10cm, increase ppo2 by 10mb. 1 msw by 0.1bar 1 fsw increases by 0.03atm 3 fsw by 0.09atm
52
OXYGEN USED DURING DECO FORMULA=
(Ln of initial pressure)X ppo2(bar) x chamber volume. Page 28/29 Imca d 022
53
Fleet angle should not exceed?
1.5 degrees Fleet is half length of the drum, distance moved from centre to edge of drum.
54
How many turns of wire should remain in drum?
5 turns, pressure lubricated 6 monthly or replaced every 2 years.
55
Man riding winches should have?
2 independent brakes , subject to 6 monthly and annual load tests , plus ndt of welds.
56
Drum should not be overloaded with cable……
2.5 times the diameter of the wire between the outside of top layer and edge of the drum flange.
57
Convert litres to ft3? Multiply by?
0.035 ft
58
BIBS CONSUMPTION
20LPM, 0.7ft3 min 28.8m3 day / 1017ft3 day
59
Heliox environment minimum oxygen % for combustion is?
6%
60
Co2 tube in bell at 400 fsw scale reading 1.4% True % co2, pCo2, SEP?
True % = 0.107% Pco2 = 0.014 SEP 1.4%
61
Beaufort windscale gentle breeze?
FORCE 3
62
Beaufort strong breeze? Force and knots
Force 6, 22-27knots
63
Beaufort gale?
Force 8
64
Transponder and transducer locations?
Transponder on the bottom. Transducer on vessel.
65
Ft3 to m3?
X 0.28

Air/Sat Sups IMCA Revision (8 decks)

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