90to90
Registered
I'm hoping I don't embarrass myself with this question, but I was having a discussion with a fellow diver who is interested in taking the first steps into tech diving, and the topic of air volume requirements came up. I am not (yet) a tech diver, but am familiar with some of the basic concepts of deco diving. I told my buddy that when I take ANDP, if I don't do it in my sidemount kit, I will probably get two steel 50's for a backmount rig, since I am a smaller woman and honestly probably don't have the strength to put two steel 80's on my back in addition to carrying a bail out. This buddy told me that 100 cuft of air wouldn't be enough for a deco dive. By my understanding, air volume requirements are dictated mostly by depth, bottom time and one's SAC rate, no? So couldn't someone with a pretty low SAC rate who wasn't trying to hang out at 130' for half an hour plan a safe, shallower, shorter deco dive with 100 cuft of air, while still respecting the rule of thirds? Again I haven't taken ANDP myself so haven't planned out a deco dive yet, but requiring you carry a minimum of 160 cuft of air, not including bail out, for a conservative deco dive seems excessive to me.