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> It is bullshit. - G Chief, and everyone else... I have breathed pure O2 in a chamber at a simulated depth of 220 feet. I have breathed a PO2 of about 3.0-3.5atm for hours on end, and in some cases underwater under heavy exertion. I have never had any signs or symptoms of CNS oxygen toxicity. By your logic, I should bump my PO2 setpoint up to 3.0 to cut down on the deco. But instead, I keep it at 1.4 or less. Why? Because O2 toxicity can bite you in the ass when you least expect it. It is also a physiological phenomenon that we (as a species) know very little about. Hence, we choose to err on the conservative side, and live another day to badmouth people on techdiver. I O2-clean all my equipment that gets exposed to pure O2 at over 500psi. I'm not anal about it, but I do it nonetheless. I've never had an O2-induced fire. I've never seen an O2-induced fire (except on video). However, I have spoken to people with first-hand experience. Granted, only one of these involved scuba, but physics is physics, regardless of the application. A guy from NASA showed some videos at the nitrox workshop in Houston of HP lines exploding in flames when exposed to 3000psi O2 (much less than 10,000 psi). As far as I'm concerned, it CAN happen, and because I don't really have a handle on the probability of it happening under various conditions, I'm going to err on the conservative side so that I can live another day to dispense good and valuable information and advice on techdiver. Aloha, Rich > > On Tue, 20 Aug 1996, iantdhq@ix*.ne*.co* (IANTD ) wrote: > >Joan > >You are totally wrong, NOAA uses partial pressure filling into oxygen > >service cylinders only. In fact NOAA rarely partial pressure fills they > >normally use continious blending on mixes up to 40%. > >On these mixes they do not clean regulators. They must clean anything > >above 40% as it is federal law. > >If you check the research you will discover there is justification for > >the laws that require oxygen cleaning on mixes above 40% or any time > >one is partial pressure blending. > >I will be glad to supply you with the NAVY, COASDT guard, OSHA, NOAA, > >and hundreds of pare on the subject. > >Tom Mount > >You wrote: > >> > >>You wrote: > >>> > >>>Should a regulator be cleaned for pure O2 or is it another B.S. O2 > >>cleaning ? > >>> > >> > >>Gil. > >>> > >> > >>Gil, > >> > >>This is one of the purest forms of bullshit in existance. > >> > >>This is a lie that is being propogated by dive equipment > >>manufacturers, dive shops, and dive training agencies to separate > >>the diving public from their hard earned money. > >> > >>Ignition of pure oxygen is only a problem at pressures OVER 10,000 > >>psig. > >> > >>NOAA and other agencies and individuals have been partial filling > >>cylinders using pure oxygen for better than 50 years as well as using > >>standard off the shelf regulators WITHOUT failure of any of these > >>devices due to filling or breathing pure oxygen. > >> > >>-Joan- > >> > > > > > > George M. Irvine III > DIR WKPP > 1400 SE 11 ST Ft Lauderdale, FL 33316 > 954-493-6655 FAX 6698 > Email gmiiii@in*.co* > > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. > Richard Pyle deepreef@bi*.bi*.ha*.or* ******************************************************************* "WHATEVER happens to you when you willingly go underwater is COMPLETELY and ENTIRELY your own responsibility! If you cannot accept this responsibility, stay out of the water!" *******************************************************************
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