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>At 06:56 PM 12/9/94 -0800, Rod Farb wrote: >>>Mike Pallone writes: >>>You cannot use 100% O2 with standard scuba equipment. >> >> >>NONSENSE: I have done this routinely for twelve years with Sherwood, U.S. >>Divers, Dacor & Poseidon regulators out of the box. >> > >I believe that this original statement was with regard to the >deterioration to O-rings that can occur when exposed to high pressure >oxygen. And that we generally refit these stock regs with O-rings >built to be inert in that environment. > >I'm curious, Rob, are you saying that you have not experienced any >excessive deterioration in your regulators? And that you don't have >them fitted with special rings? How long between service for your regs. >------------------------------------------------------------- >Scot Anderson ]SCOTT AND ANDREW COHEN, AND MARK LEFEVRE: O rings that come standard in the regulator are changed only at annual maintenance and only with conventional O rings. There is excessive oxidation of some metal parts inside the first and second stages but again these are changed out at annual maintance as well. The oxygen regs are used exclusively with oxygen. I have a 330 cu ft. cylinder of aviator's oxygen 2250 psi) on boat with a scuba valve attached to the outlet. The first stage (US DIVERS PRO) attached there is connected to a 25 ft. long hose which has a stainless steel ball valve (3000 psi) at the other end. The valve is attached to a metal block which holds two 7 ft. long whip hoses to which are attached SHERWOOD second stages. The single down hose is attached along its entire length to a long 1/2 inch rope which is tied to the boat at one end and has a twenty pound weight on the other end. The rope is lowered down such that the stainless ball valve is at 20 fsw; the weight on the rope is located at 30 fsw. Decompression on pure oxygen takes place at 20 fsw. I use two identical arrangements as described to decompress four divers. I have used this system for twelve years; and the last five years on the U.S.S. Monitor and the past three years on the CSS Alabama. The french divers in Cherbourg, France independently developed almost the identical system minus the ball valve. The french divers have never oxygen cleaned their regulators. I have never had a problem with deterioration of my system by oxygen. I have never oxygen cleaned any part of this system ever. The entire hose system undergoes annual maintenance. > >email: scot@bt*.co* > scot@in*.co* > URL: http://www.btg.com/~scot/ > >Vienna, Virginia. >USA > >Voice: 703.761.6536 > Fax: 703.761.6555 > > >
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