Understanding Air Tank Selection

[MikeS]

This is part two in my search to identify the best BP and wings combination. I think I need a little more help here. The number, size, and construction of tanks will directly affect buoyancy (part one http://www.scubaboard.com/t8838/s.html ). So, I’m trying to work out a methodology for selecting the right tank configuration.

The fist step would be to determine the amount of air I need, because unfortunately I can’t take it all with me! My assumption is that all dives will be planned as no-deco dives. So it seems that the key is to have sufficient air to reach the maximum no- decompression bottom time and safely surface, including a safety stop, with an acceptable safety margin left over.

In that case the amount of air required for any given depth is equal to:

SAC (under the worst conditions) times the maximum bottom time
+ SAC (under the worst conditions) at 15 FSW times 5 minutes (safety stop)
+ minimal reserve (say 500 psi times tank volume)

Once again any corrections, comments, or additions are greatly appreciated. Insults are only appreciated if accompanied by exceptional wit!

Thanks,
Mike

 

[100days-a-year]

MikeS,..Include in the mix the following as well.Maximum expected depth,minimum temerature(hence exposure protection wet or dry)price,concerns on fills if taking a DIN tank travelling.And don't forget the dive shops favorite selling point ......color.