FORMULAE

Question 1

C = (F - 32)
__________
1.8

Answer 1

F = (1.8 x C) + 32

Question 2

CALCULATING GAS VOLUMES BY PROPORTION

Answer 2

PR AVAILABLE

————————X VOL WHEN FULL PR WHEN FULL

Question 3

Absolute Temp (K) = Temp in C + 273

Answer 3

Absolute Temp (R) = Temp in F + 460

Question 4

Diving Time Available (How Long Has He Got?)

Answer 4

GAS AVAILABLE
______________

GAS CONSUMPTION

Question 5

GAS AVAILABLE

Answer 5

FGV = FV X PRESSURE

Question 6

GAS CONSUMPTION

Answer 6

BR X AP

Question 7

Charles Law of Final Pressure / Final Temperature

Answer 7

Final Pressure=Initial Pressure x Final Temperature (Abs)
___________________________

Initial Temperature (Abs)

Final Initial Final Initial

Question 8

DAILY GAS USE IN A CHAMBER

Answer 8

FGV = Lock Volume x Depth Added (msw or fsw)
_________________________
10 or 33 As Req’d

Question 9

VOLUME OF LOCK

Answer 9

PIE x RADIUS2 x LENGTH

Question 10

DIVER 02 CONSUMPTION

Answer 10

No Of Divers x No Of Days x 0.72m3 or 25ft3

Question 11

TRUE PERCENTAGE OR SURFACE EQUIVALENT PERCENTAGE (SEP)

Answer 11

True or SEP = Scale Reading
_______________
Absolute Pressure

Question 12

FINAL PRESSURE LEFT / PRESSURE DROP IN QUAD OR KELLY

Answer 12

FINAL PRESSURE =

GAS USED (FGV)
\_\_\_\_\_\_\_\_\_\_\_\_\_\_\_

FV of QUAD OR KELLY

Question 13

EQUALISING CHAMBERS AT A NEW DEPTH

Answer 13

GP (Depth) = TOTAL FGV
__________

                     Total FV

Question 14

HOW TO FIND THE FV OF A DDC FROM GAS USED IN BLOWDOWN

Answer 14

FV = GAS USED
_________
GP

Question 15

What PPO2 will the Merging Chambers Equalise At?

Answer 15

PPO2 = Total Oxygen Volume
___________________

                     Total FV