Physics Caculations Flashcards
Practice makes perfect!
A diver suffering a DCI is given a total of 6 cycles of 30 minutes on BIB’s. The chamber is at 70 MSW. How much treatment mix is used?
28.8 m3
A DDC with a FV of 16m3 is pressurised to 60 MSW. Temperature on arrival is 30 degrees C. Later the temperature falls to 26 degrees C. What is the new depth of the DDC?
59.2 meters
Using a treatment mix at 137 msw with a ppo2 of 2.2, what is the O2 %?
14.9%
Using a 425 MSW gauge, what does the reference marked on the gauge +- 0.25 of 1% equal as an acceptable error in when calibrated?
+- 1.06 MSW
A DDC is at a depth of 380 FSW. The analyser at the surface shows the CO2 to be 420 ppm. What is the surface equivalent?
5254 PPM
What is the metabolic consumption for 6 divers for 17 hours at 85 MSW?
3.06 m3
What mix would be required to perform a dive to 250 FSW using a ppo2 of 1.3 ATA?
15%
You are to use a 6% mix to establish a ppo2 of 400mb in a DDC.
To what depth would you pressurise with the 6%
21 MSW
You require 195 bar of 8%.
Mixes available are 5 & 15%
How much 5% is required?
136.5 bar 5%
Your company’s ppo2 during deco is .5 bar.
At what depth would the O2 % reach 21%
13.8 MSW
You vent a chamber from 60 MSW to surface.
If the O2 was 5% at 60 metres, what is the O2 and ppO2 at surface?
50 mb \ 5%
You are to pressurise a DDC from the surface to 75 MSW using 2% & 8%.
ppO2 required on bottom is 400 mb.
How deep will you pressurise the DDC on 8%?
6.66 MSW on 8%
You have a DDC at 220 MSW.
The O2 is 2%.
If the DDC is vented to 130 MSW what is the ppo2 & O2 % at the new depth?
ppO2 = 280 mb \ O2 = 2%
A colourmetric tube reading is taken in the bell and shows 0.6%.
Bell depth is 80 MSW.
How many PPM CO2 is showing on the surface analyser?
666 PPM
A chamber is pressed from surface to 10 MSW using 6%.
What is the ppo2 in the chamber at 10 MSW?
Same chamber is pressurised from 10 MSW to 70 MSW using 4% HeO2.
What is the ppo2 at 70 MSW?
Same chamber is then pressurised from 70 to 120 MSW using 2.5% HeO2.
What will be the final ppO2 at 120 MSW and the O2%?
270 mb
510 mb
635 mb & 4.88% O2
A DDC is pressurised from the surface to 210 MSW using 2% HeO2.
What is the He % at 210 MSW?
93.5%
A 12 litre bailout is charged to 200 bar.
The dive is planned to 110 MSW.
How much umbilical can be deployed?
42 meters
You have unlimited pure Helium & Oxygen, and want to make 195 bar of 6%.
How many bar of O2 is required?
11.7 bar O2
If 300 psi of O2 is added to 1200 psi of 3%, what will be the final % of the mix?
22.4%
Using the following mixes, using mix 2 as your base, how much 2% will be required to make 200 bar of 8%?
Mix 1 = 200 bar of 10%
Mix 2 = 50 bar of 3%
Mix 3 = 200 bar of 2%
7.5 bar 2%
(142.5 bar 10%)
