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Vie · June 14th, 2007, 11:22 AM

Apologies if this has been asked before - I'm not even sure I'm posting this question in the right section but here goes...

For the Tech 2 class, am I correct in understanding that, in addition to backgas, each diver will be carrying an AL80 stage bottle, an AL40 deco bottle (EAN 50) and another bottle with O2?

GUE specifies...

"Tanks/Cylinders: Students are required to use dual tanks/cylinders connected with a dual outlet isolator manifold, which allows for the use of two first-stages. All dives must start with a minimum of 80 cubic feet/2250 liters of gas. Also required are two decompression cylinders: one (1) greater than 30 cubic feet/850 liters for Nitrox and one (1) 30 cubic feet/850 liters, or greater, for an additional deco gas."

But this does not seem to match the number of bottles alluded to in the Tech 2 class report that I've read.

I've seen both AL40 and AL30 used for O2 - is there any particular reason why one size would be preferable over the other?

June 14th, 2007, 11:22 AM	#1 (permalink)
Vie(Offline) Loner at the ball... Join Date: Nov 2005 Location: Krung Thep, Siam, mostly Posts: 191	Stage/deco bottles for Tech 2... Apologies if this has been asked before - I'm not even sure I'm posting this question in the right section but here goes... For the Tech 2 class, am I correct in understanding that, in addition to backgas, each diver will be carrying an AL80 stage bottle, an AL40 deco bottle (EAN 50) and another bottle with O2? GUE specifies... "Tanks/Cylinders: Students are required to use dual tanks/cylinders connected with a dual outlet isolator manifold, which allows for the use of two first-stages. All dives must start with a minimum of 80 cubic feet/2250 liters of gas. Also required are two decompression cylinders: one (1) greater than 30 cubic feet/850 liters for Nitrox and one (1) 30 cubic feet/850 liters, or greater, for an additional deco gas." But this does not seem to match the number of bottles alluded to in the Tech 2 class report that I've read. I've seen both AL40 and AL30 used for O2 - is there any particular reason why one size would be preferable over the other? Last edited by Vie; June 14th, 2007 at 11:26 AM.