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> > On Wed, 29 Nov 1995, Jason Rogers wrote: > > > With an independent system (be it in cave or OW) other peoples mistakes > > won't do you in. > > Follow rule #1, that should solve this. I can follow rule #1 with ease! (Don't dive with strokes) as I never dive with *anyone*. I also identify strokes on the hoof, by looking for the manifold. How do you spot a stroke *before* they throw the shit into the fan? > > Those figures were based on *one* disk failing in a manifolded set. > > The pressure remaining, was the pressure in both cylinders and the > > time was the time to closing the isolation valve. Then the > > pressure remaining was the pressure left in the cylinder with the > > "good" disk. The other one will drain to nothing, and there is no > > way to stop it. > > > > I mentioned two holes because there are two types of burst disk plug > > in common use. I measured, and did the figures for the one with the > > *lowest* flow. The *single* hole plug. These are now falling into > > disfavour due to liablity concerns with cylinders flying around when > > the disk goes. They are being replaced with "reactionless" plugs, > > which have *two* holes in each plug (nothing to do with there being > > two plugs in a manifolded pair) This type of plug will flow twice > > as fast as the older single hole type, because it has two holes! > > Once again, how long does it take to dump the contents of a tank through > a burst disk. Really. The ones I've seen do not go in "10 seconds" (even > though with all the damn noise they make you wish they did). Now down > below you offer to blow $100 worth of trimix.. That does open one > question, which this is pure ignorance on my part, does trimix dump > quicker because of the lack of gas density compared to air? Yes. Helium will flow more than twice as fast as air. TMX is somewhere in between (depending on the mix). For the high He mixes used in the states (where He is *CHEAP*) then double is close to the mark. > > > Jason, next you'll be telling me you want to do trimix fills based on > > > a set flow psi over <x> minutes ;-) > > > > > Isn't that how ANDI mixes NTX? ;) > > That explains a lot about the "safe air" campaign... > > Ken > Cheers Jason =:)
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