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George, You better not dive those doubles mixed in 1997. According to Bill Stone's Wakulla book all the helium molecules have escaped by now and you only have a nitrox mix. On a more serious note, can you give more info on the tank going on you in the habitat? What happened the burst disc blew? I knew that the Luxfer tanks had a problem with their tanks containing to much aluminum in them and developed neck cracks. Is this what you are refering to? What reasons do you have for not using an aluminum for more than a year? TB --- kirvine@sa*.ne* wrote: > What does WKPP do? We plug them with 1/16" shim > material. We generally > fill the tanks to about 3300 . We also throw them > away when they get > old. Also, most of us have several sets, so no one > set gets to much > cycling, which is what kills the tank. > > One big problem with steel tanks is that they will > pas hydro pretty much > no matter what since they tend to stretch and stay > that way, so then do > not show the overstretch and failure to return in > the hyrostatic test. > > Better to leave tanks full all the time than cycle > them. In WKPP, our > rules are specific as to gas manmgement - we are the > worlds biggest > weenies - we usually do not even touch the backgas, > so many of us go > months without refilling cave gas doubles. I have > sets marked 1997 still > in the que. > > For anyone else who is just doubles diving, I would > suggest buying new > tanks and pitching them rather than hydroing them if > you are diving > constantly. > > For aluminum tanks, I would definitely give them the > boot every few > years. These things at $100 per are not barely even > worth VIPing a > second time in my opinion. I have already had a few > of these go of on me > in the fill bin , but luckily they did not come > apart. One came apart on > me and JJ in the habitat. > > > Jbdvr@ao*.co* wrote: > > > > Yet another question. I, like everyone else who > dives in north-central Fl, > > Pumps their steel's to 3300 to 3500 psi. Should > this practice be stopped > > after a certian time period,say 5 to 6 years? My > burst disc's are the > > originals, rated for 3000 psi. A lot of people say > that the best thing to do > > is; double burst both tanks to remove a potential > failure point,OR plug one > > tank and install a 4000psi disc in the other one > OR install 4000 psi disc in > > both tanks OR, do nothing. What does the WKPP or > other hard-core cavers do? > > thanks....Joe B > > -- > > 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'. > __________________________________________________ Do You Yahoo!? Talk to your friends online with Yahoo! Messenger. http://messenger.yahoo.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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