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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
Q

FGV WHEN FV Known

A

FGV = PRESSURE X VOLUME

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26
Q

Litres to one ft3

A

28.32 litres

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27
Q

Imperial ton lbs?

A

2240lbs

28
Q

1 US TON LBS?

A

2000lbs

29
Q

1fsw is how many PSI?

A

0.445psi

30
Q

FSW/? = MSW

A

3.281

31
Q

Reclaim gas usage

A

5 LPM OR 0.18ft3/min

32
Q

Chamber BIBS CONSUMPTION in LPM AND ft3/min?

A

20 LPM OR 0.7ft3/min

33
Q

Metabolic O2 consumption metric imca D050

A

0.5LPM, 30 LPH, 720per day
0.72m3

34
Q

Metabolic 02 consumption imperial

A

0.018ft3/min 25ft3/day per diver

35
Q

Cubic feet in one cubic metre?

A

35.32 cubic feet

36
Q

PPM TO %

A

Divide by 10’000

37
Q

% to PPM

A

Multiply by 10’000

38
Q

PPM TO PP

A

Divide by 1000’000

39
Q

PP to PPM

A

X 1’000’000

40
Q

% to PP

A

% divided by 100

41
Q

PP TO %

A

PP X 100

42
Q

Partial Pressure(mb) =

A

Absolute depth (MSW) x %

43
Q

EAD FORMULA FPS

A

N2% x ABS DEPTH/79-33

44
Q

EAD FORMULA METRIC

A

N2% X ABS DEPTH/79-10

45
Q

FINAL DEPTH =

A
46
Q

Max co2 ppm?

A

5000ppm Co2
0.5%
5mb
0.005 bar

47
Q

General gas law

A

P1xV1 = P2xV2
T1. T2

48
Q

1kg Soda lime absorbs ?

A

120 Litres co2

49
Q

1kg soda lime last a diver how long?

A

1kg 4hours

50
Q

Alternative formula for PP in mb?

A

Pp(mb) = ABS depth X %, not decimal %

51
Q

Adding o2 to the chamber ppo2 increases by:

A

10cm, increase ppo2 by 10mb.

1 msw by 0.1bar

1 fsw increases by 0.03atm

3 fsw by 0.09atm

52
Q

OXYGEN USED DURING DECO FORMULA=

A

(Ln of initial pressure)X ppo2(bar) x chamber volume.
Page 28/29 Imca d 022

53
Q

Fleet angle should not exceed?

A

1.5 degrees
Fleet is half length of the drum, distance moved from centre to edge of drum.

54
Q

How many turns of wire should remain in drum?

A

5 turns, pressure lubricated 6 monthly or replaced every 2 years.

55
Q

Man riding winches should have?

A

2 independent brakes , subject to 6 monthly and annual load tests , plus ndt of welds.

56
Q

Drum should not be overloaded with cable……

A

2.5 times the diameter of the wire between the outside of top layer and edge of the drum flange.

57
Q

Convert litres to ft3?
Multiply by?

A

0.035 ft

58
Q

BIBS CONSUMPTION

A

20LPM, 0.7ft3 min
28.8m3 day / 1017ft3 day

59
Q

Heliox environment minimum oxygen % for combustion is?

A

6%

60
Q

Co2 tube in bell at 400 fsw scale reading 1.4%
True % co2, pCo2, SEP?

A

True % = 0.107%
Pco2 = 0.014
SEP 1.4%

61
Q

Beaufort windscale gentle breeze?

A

FORCE 3

62
Q

Beaufort strong breeze? Force and knots

A

Force 6, 22-27knots

63
Q

Beaufort gale?

A

Force 8

64
Q

Transponder and transducer locations?

A

Transponder on the bottom.
Transducer on vessel.

65
Q

Ft3 to m3?

A

X 0.28

Air/Sat Sups IMCA Revision (8 decks)

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