Dive Planning Question

[Comp.Air.Junkie]

Going by the premise that there's no such thing as a stupid question:

Is it safe to assume when planning your dive and using your SAC to determine turn points. If the cylinder only read 2300 psi. before your first dive:

(not saying you would use both cylinders at the same time. Just using two examples.)

2300 psi. in an 80 cuft. cylinder is 61.3 cuft.
2300/3000 * 80 (as long as the working pressure of the cylinder is 3000 psi.)

2300 psi. in a 100 cuft. cylinder is 76.6 cuft.
2300/3000 * 100 (as long as the working pressure of the cylinder is 3000 psi.)

you would only have 61.3 cuft. in an 80 and 76.7 cuft. in a 100. Right?

 

[TSandM]

Your arithmetic is correct. However, I can't find any 100 cu ft cylinder for which the working pressure is 3000 psi.

 

[GrandpaScuba]

Aluminum 100's are 3300 psi. Steel 100's come as 3442 psi or 3500 psi.

 

[Comp.Air.Junkie]

your both right on the 100's I guess it was brain fade.