Question is... Did the guy on his NITROX course pass? hahaI do not think they made any changes to it, and yep, you get above a certain percentage of oxygen and titanium makes a nice fire. wish we had a camera at the time, but a bunch of people where curious, so they took one and turned it on with the higher oxygen. it did take a little bit, but man that was a hot and bright fire underwater. (and yes the nitrox tank was out of the pool so we could turn it off once the reg went)
thus the reason I am trying to stay away from it. lol.
Anyone who knows me at all knows I LOVE titanium. Watch, glasses, dive knives... Light weight and strong with little maintenance. I even have a wedding ring picked out for the day when I finally do decide 'she' is the one (Whoever 'she' is...). I have never been disappointed with that metal. However, I would never buy a titanium reg. The cost is exorbitant and whatever weight you save has to go on your weight belt. Nicer to carry through the airport, but that is all.
Now as for the above post I don't think so...
OK, under enough pressure, with an ignition source and 100% O2, titanium will burn. However, so does brass, stainless steel, copper, zinc and others at much lower temps. If a reg has been serviced with an O2 clean kit then chances of ignition are as close to zero as me getting lucky tonight. Yup, that low...
Melting point of pure titanium is 1668 °C (3034 °F). Stainless steel is 1500 °C (2732 °F)
BTW, many aircraft makers use titanium piping and valves for aviation O2 systems.