EAN dive tables

[100ydacvp]

can someone help me, I am trying to write a few dive tables in excel and I'm having a meltdown with the formulas.

according to the NAUI EAN 32% table 1997 issue.
70' @ 50min = H group.
but using 36% table 1997 issue states
70' and 80' @ 50min = H group

I'm trying to write tables for 26-31 and 37-50%.
I know someone out there has already written them from 22% thru 100%o2 but I can't seem to find them online anywhere.

how do you figure the sit times? what is the rate of off gassing? if helium off gasses faster than nitrogen than at what rate?

I have so many questions and I don't want to be bashed by cyberdivers that have never been in the water, this is my life and I'm asking for real help.

 

[HowardE]

Are you just using the EAD formula and the air table?

Offgassing? On a Surface Interval? What are you trying to do?

 

[gcbryan]

can someone help me, I am trying to write a few dive tables in excel and I'm having a meltdown with the formulas.

according to the NAUI EAN 32% table 1997 issue.
70' @ 50min = H group.
but using 36% table 1997 issue states
70' and 80' @ 50min = H group

I'm trying to write tables for 26-31 and 37-50%.
I know someone out there has already written them from 22% thru 100%o2 but I can't seem to find them online anywhere.

how do you figure the sit times? what is the rate of off gassing? if helium off gasses faster than nitrogen than at what rate?

I have so many questions and I don't want to be bashed by cyberdivers that have never been in the water, this is my life and I'm asking for real help.

If you think cyberdivers on are Scubaboard then why post to Scubaboard? If you feel your life is involved in the answer to this question on Scubaboard you have made an error in judgment from the outset.

Surely you aren't using helium and having to ask these questions? Rate of off gassing...there is no direct answer to this question.

Are you just having problems with the equivalent air depth formula? EAD = (FN2 * (d + 33)/.79) -33

 

[ucfdiver]

This should answer your questions-
DIY DECOMPRESSION

 

[John_B]

Redacted.

 

[100ydacvp]

HowardE;

I was trying to use the EAD but I found too many errors and I could not get my SIT correctly.
also @ 40% with say a 2:18 min SIT from a 55' dive what would my RNT come to for my second dive?
as for the off gassing..how do you figure it, amount, rate, %..? what is the formula?
also the question regarding the helium...It is a question I have always wanted to know..

 

[100ydacvp]

gcbryan;

its a numbers game, I know cyberdivers are out here, but I also know there are a bunch of great minds also that are willing to help educate and share there knowledge without contempt for the person asking.
My live is always involved in all facets of day to day living, trust me when I say "I am not going to take anything from this board as gospel until I have exhaustively checked all the numbers"
yes I am using helium...but I still do not know how much I'm off gassing at say..
1. 60' @ 11min
2. 40' @ 8min
3. 100' @ 12min
there are direct answers to these question I'm sure, you just don't know them and that's ok, not alot of people do or care to know I just happen to be a person that has these weird questions...that's all..

P.s. elementary formula..good though..

 

[100ydacvp]

Robert @ NAUI has supplied me with tables from 22% to 50%...

But I would still like to know what the formulas were to make them..

 

[Meng_Tze]

Robert @ NAUI has supplied me with tables from 22% to 50%...

But I would still like to know what the formulas were to make them..

You will find that the math behind the tables is based on rather complex models. More than excel can handle.

I think NAUI uses RGBM nowadays. For RGBM information, I'd suggest to look up Dr. Wienke's books and other published works

 

[ucfdiver]

HowardE;

I was trying to use the EAD but I found too many errors and I could not get my SIT correctly.
also @ 40% with say a 2:18 min SIT from a 55' dive what would my RNT come to for my second dive?
as for the off gassing..how do you figure it, amount, rate, %..? what is the formula?
also the question regarding the helium...It is a question I have always wanted to know..

I posted the formula. Most things having to do with physics can't be simplified to a middle school level y=mx+b