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-- [ From: Mike Sandler * EMC.Ver #2.3 ] -- -------- REPLY, Original message follows -------- > > A quick survey.......... > > > > There have been a few odd posts on decompression gas choice etc. My > impression > > is that it is kind of split between Eanx80 & 100%O2. The reasons given > for each > > are usually:- > > There is a significant practical advantage in using 100% oxygen, in that no > gas mixing or analysing is involved. The dive cylinder is simply refilled by > decanting/ haskelling or whatever from a bulk oxygen supply. That same supply > is a good source of large quantities of backup oxygen for thereputic (sp?) use > if ever needed. > > If using just one deco gas, especially if the 'bottom' gas is air, the > avoidance of gas mixing eases the logistics of the diving significantly. > > If using two or three deco gases, Eanx80 rather gives longer deco times, > especially if the next 'stongest' deco gas is Eanx50 or Eanx60. -------- REPLY, End of original message -------- except for the fact that pure O2 IS easy to aquire, I personally feel that a 80% O2 nitrox mix would be desirable because; the difference in deco times as opposed to 100% O2 would be negligible AND the safety margin with respect OTU's is greatly increased with a 80% mix consider the 200+ ft air diver with a twenty-five minute or more bottom time. Also its more forgiving while trying to maintain that 20 ft. stop in open seas. Mike.
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