Kevrumbo
Banned
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Some easy "Rules of Thumb" Gas Planning for the Basic Open Water Diver:
And the attached below is a Gas Planning Rock Bottom Spreadsheet, which applies NWGratefulDiver's article very nicely and neatly, with all the heavy arithmetic aside and transparent. . .
Taken from Lamont's highly influential post [at least for me it was --and still is!] in a thread very much like this one, over three years ago (full text of post #61 and some context here ). Also wrote about Gas Management strategy using the above and implementing "on-the-fly". The important skill I learned --just based on the rules above-- is how to develop an intuitive feel for your gas consumption at depth in 10 minute segments and verifying it with a check of the SPG. . .1. Rock Bottom: 100psi per 10 fsw for LP104/LP95/HP120s/HP130, 100 psi per 10 fsw + 300 psi for Al80s/HP100s/LP72 -- 500 psi minimum for all calcuations.
2. 0.75 SAC: 300 psi per 10 mins per ATA for Al80/HP100/LP72, 200 psi per 10 mins per ATA for LP104/LP95/HP120s/HP130.
And the attached below is a Gas Planning Rock Bottom Spreadsheet, which applies NWGratefulDiver's article very nicely and neatly, with all the heavy arithmetic aside and transparent. . .