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I'd agree with you on everything there Jon, except for one thing... Why would you need to plug the burst disc? I understand the reasoning in the case of long cave penetrations, but it seems to me that this idea violates the Hogarthian principle of only using what you absolutely need. Sure, a burst disc will never blow underwater, but you can apply the Hogarthian principles to the possibility of accidents above water as well. I know that the chances of a tank exploding are slight at best, but the extra wear on your tank will shorten it's lifetime drastically (I would put the odds on 2 hydros at most before it's returned with a hole punched in it). The burst disc is in there for a reason, and with proper gas management, you shouldn't have a problem. If you over pressurized your 104 to 4000 p.s.i. (assuming a fill pressure of 2900, since I can't remember what it is for sure right now), the extra 1100 psi will get you an additional 39-40 cf. This would give you around 144 cuf. Why not just use double 72's, properly pressurized with the proper burst discs, and never have to change your configuration, other than adding a little weight? Ben Jon Breazile wrote: > Nathaniel Fuster Wrote: > >While the 15c.f. pony might be enough to get someone from 130feet > >to the surface with a safety hang at 15feet, I prefer the extra > >security of a 30cf just in case. > > What do you need a pony for for regular OW diving? I gave all of my > regular OW gear to my girlfriend, and went with a backplate and > Brownie's 15 lb wing. I use an 'H' valve on my tank with my burst > disc plugged. I use the same regulator setup on my OW rig and my > doubles rig (changing the regs around is a pain in the ass). The only > thing I'd do differently is use a 'Y' instead of an 'H'. I use a single > 104, drysuit, SS backplate, etc. If I have a reg failure then you can > just shut it down, and go for the backup, so why have a pony? Just > use proper gas management, and don't suck your tank dry. You can use > a 7 ft hose if you have a light, other wise the 5 ft hose works. > > This gives you a nice upgrade path to doubles (if you don't already > own them), and your gear is identical no matter what kind of diving > you do. > > -Jon > -- > Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. > Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
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