Formulars

Question 1

Pressurising a chamber with rich and lean mix to get to a set PPO2

Answer 1

(PPO2 required- initial PPO2)-(depth x lean mix%) / (rich%-lean%)

Question 2

P1T1= P2T2

Answer 2

Charles Law

Question 3

Absolute depth(msw)

Answer 3

Depth(msw) + 10

Question 4

Absolute depth(FSW)

Answer 4

Depth(FSW) + 33

Question 5

Gauge Pressure(bar)

Answer 5

Depth(msw) / 10

Question 6

Gauge Pressure(arm)

Answer 6

Depth(FSW) / 33

Question 7

Absolute pressure

Answer 7

Gauge pressure + 1

Question 8

Gauge Pressure

Answer 8

Absolute - 1

Question 9

Depth(msw)

Answer 9

Gauge pressure x 10

Question 10

Depth (FSW)

Answer 10

Gauge pressure x 33

Question 11

Absolute depth (msw)

Answer 11

Absolute pressure (bar) x 10

Question 12

Absolute depth (FSW)

Answer 12

Absolute pressure (atm) x 33

Question 13

Gas consumption (met)

Answer 13

Absolute pressure (bar) x 35 liters/ minute

Question 14

Gas consumption (imp)

Answer 14

Absolute pressure (ata) x 1.25 ft3/ minute

Question 15

Free gas volume

Answer 15

Floodable volume x pressure

Question 16

Free Gas Volume
(when FV is known)

Answer 16

Vol when full x Avail Press
————————————
Press when full

Question 17

Time Available

Answer 17

Gas Available
—————————
Gas Consumption

Question 18

Celsius to Fahrenheit

Answer 18

(1.8 x °C) + 32

Question 19

Fahrenheit to Celsius

Answer 19

(°F - 32)
————-
1.8

Question 20

Absolute temperature (°K)

Answer 20

°C +273

Question 21

Absolute Temperature (°R)

Answer 21

°F + 460

Question 22

Final Pressure

Answer 22

Initial Press abs x Final temperature (abs)
————————————-
Initial temperature (abs)

Question 23

Final Depth

Answer 23

Initial depth x Final temperature (abs)
————————————
Initial Temperature (abs)

Question 24

Partial Pressure

Answer 24

Abs Pressure x Decimal %

Question 25

Partial Pressure (mb)

Answer 25

Absolute Depth (msw) x %

Question 26

Gas Mixing Pressure of Mix ( or use triangle)

Answer 26

Final Press x (%final mix - % mix 2) —————————— (% mix 1 - mix 2)

Question 27

Depth of Rich Mix (msw)

Answer 27

(Ppo2 reqd (mb) - ppo2 present (mb) - (depth msw x % weak mix) ———————————— (% rich mix - % weak mix)

Question 28

Depth of rich mix (FSW)

Answer 28

(3300x(ppo2 reqd(atm) - ppo2 present (atm)) - ( bottom depth x % weak mix) ———————————— (% rich mix - % weak mix)

Question 29

PO2 increase (mb)

Answer 29

Depth increase (msw) x %

Question 30

PO2 increase (atm)

Answer 30

Depth increase (FSW) x decimal % ————————————- 33

Question 31

Free Gas Volume

Answer 31

Chamber Volume x Pressure added

Question 32

10cm ( 0.1 msw) of pure O2 will increase the PPO2

Answer 32

10mb

Question 33

1(FSW) pure O2 will increase PPO2

Answer 33

0.03atm

Question 34

1 msw pure O2 will increase PPO2

Answer 34

0.1 bar

Question 35

3 FSW pure O2 will increase PPO2

Answer 35

0.09atm

Question 36

Oxygen used during decompression

Answer 36

(LN of the initial abs pressure) x PPO2(bar) x chamber volume

Question 37

Sample tubes True %

Answer 37

Scale Reading ———————- Abs Pressure

Question 38

Sample tubes Partial Pressure ( bar or ata)

Answer 38

Scale Reading ———————- 100

Question 39

Sample tubes Partial Pressure (mb)

Answer 39

Scale reading x 10

Question 40

Sample Tubes SEP

Answer 40

= scale Reading

Question 41

Buoyancy Up thrust=

Answer 41

Volume of water displaced x density of water

Question 42

Density of Freshwater

Answer 42

1kg/ liter 1 ton/ m3 10lbs/ imperial gallon 8.3lbs/ US gallon 62.5 lbs/ft3

Question 43

Density of Sea Water

Answer 43

1.03 kg/ liter 1.03 ton/ m3 10.3 lbs/ Imperial gallon 8.6 lbs / US Gallon 64.38 lbs/ ft3

Question 44

Diver Gas consumption

Answer 44

35 litre/minute 1.25 ft3/ minute

Question 45

Diver Gas Consumption ( Recovery System)

Answer 45

5 litres/ minute 0.18 ft3/ minute

Question 46

Divers Gas consumption from bail out or other supply source in an emergency

Answer 46

40 litres/ minute 1.5 ft3/ minute

Question 47

Metabolic O2 consumption in chambers

Answer 47

- 0.72m3/ day or 0.5 L/min per diver. - 25ft3/ day or 0.018ft3/ min per diver.

Question 48

Soda Sorb usage

Answer 48

- 1kg absorbs 120 litres CO2. - 1kg lasts on diver 4 hrs. - 6 kg last one diver 24 hrs