another gas planning question

[scubajohn921]

excuse me for asking but all the examples arent relative to me and im having difficulty matching them up to what i have, so, a 100ft dive on a charter on say 32% EAN (best mix?) with a sac rate of .75, on a hp 100 how should i profile this dive, (bottom time, inc ascent, stops etc etc) then a 2 hr s.i and a 2nd dive to say 85 ft same thing, im thinking a 32 mix in a hp 100, (trying to find my ean book from class did it last year and havent used ean since) i know rick posted a great article about working backwards to front on dive planning but im having diffs using my own stuff as mentioned above , any pointers?
John

 

[The Kraken]

OK, 100' with a SAC rate of 0.75 will yield you an available gas time, with 500 psi in reserve, of approximately 28 minutes.

NDL for a 100' dive one EAN32 is 30 minutes.

Planning a multilevel dive may help some, but you'll still be close.

So let's figure square profile for a 24 minute dive = pressure group N

2 hour S/I yields a pressure group of B

Your NDL for your next dive to 85' on EAN32 will yield an EAD of 70'

At pressure group B you can do a 31 minute dive.

At 85' with a 0.75 SAC rate you'll have about 32 minutes of breathing gas.

Hope this helps.

the K

 

[scubajohn921]

the K, right on as usual, thank you