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“There’s a big difference between tolerance and respect. Tolerance is you saying something crazy and me smiling and saying ‘that’s nice.’ Respect is when you say something crazy and I say ‘you’re out of your f—ing mind.’ Direct confrontation, direct conversation is real respect. And it’s amazing how many people get that.” - Penn Jillette
[countdown=7/7/2020 12:00 PM]Count down:[/countdown]until my new dive buddy - grand daughter can take her OW class!.
I frequently carry cylinders with Nitrox & even 100% O2. No problems here. There may be a slightly incresed fire hazard (as the incresed % of O2 can make a fire burn more intensely) in the event of an accident that involved a fire & rupture of the cylinders.
The 500 psi is used to help keep moisture & contaminents out of the cylinders to maitain the O2 cleaned status (if they are). They can be carried full or nearly empty.
There's nothing magical about 500 PSI. As long as there's some positive pressure, even a few PSI over ambient, no atmospheric air will get in.
And, there's no such thing as "nitrox" tanks. There are regular scuba tanks, and there are tanks cleaned to 100% oxygen standards. The O2 clean tanks are necessary any time the tank or valve is exposed to O2 concentrations above 40%, according to generally accepted industry standards. "Nitrox" technically could refer to any blend of air and oxygen, I suppose, but the near-universal use of the term refers to recreational diving blends of 40% or lower O2 levels.
So the only time you need an O2 clean tank for nitrox use is when the tank is being filled with the partial pressure method, in which the tank temporarily has higher concentrations of O2 and/or the valve is exposed to 100% oxygen during the filling process. Banked mixes and continuous mixing systems are fine with regular old tanks.
It never fails to amaze me how much confusion and mis-information there is about this relatively simple topic.