%CNS per min

[jccl121990]

hey guys i have been reading my naui intro to tech textbook for my upcoming class and im working now on dive planner for for trimix 16/24..all the calculation makes sense to me but the one i cant figure out how they came up with that number is the %CNS per min,if you guys could help and explain how they get that number ,what formula do they use base on those number to get those number in the %CNS per min column...thanks in advance

sch time FO2 PO2 %CNS per min
20 0.17 0.93 0.28

how did they get that 0.28??

 

[Teller]

Im not really sure what you are asking but it should have been covered during nitrox.

Actual time/NOAA recommended time X 100 = CNS%

 

[jccl121990]

that formula i know..but i was trying to use that one to see if i could come up with a number close to the number here in the table but i cant...i tried to upload a pic of the table but i wont allow me...its like calculating %cns per min for every segment of the dive..do you know how to do that?

 

[underH2Oman]

You could read this paper. It has lots of good information.

http://www1.maths.leeds.ac.uk/~read/scuba/baker3.pdf

 

[wedivebc]

that formula i know..but i was trying to use that one to see if i could come up with a number close to the number here in the table but i cant...i tried to upload a pic of the table but i wont allow me...its like calculating %cns per min for every segment of the dive..do you know how to do that?

This is the CNS table published by NOAA

 

[WheelsUSN]

At a PO2 of 0.9 the recommended limit from the NOAA table is 360 minutes. 1/360 x 100=.28

 

[rongoodman]

16/24?

 

[jccl121990]

16/24?

i found the navy tables with the exposure time limits and i was able to calculate everything thanks alot guys