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> From: "Marc Dufour" <emdx@ac*.ne*> > To: techdiver@terra.net > Date sent: Mon, 20 Nov 1995 17:53:42 +0000 > Subject: Carbon dioxide tanks > Send reply to: mdufour@ca*.or* > Priority: normal This is where I give my age away. When I started diving, ...says he on crutches...! Seriously, in those days we were all tech divers, only we didn't know it. Genuine diving cylinders were expensive, in short supply and we scrounged tanks wherever we could find them. After taking all the surplus oxygen tanks from the local air force base, we were still in short supply, when someone woke up to the fcat that there were all these fire extinguishers hanging around, that might be usable for diving. Some homework quickly showed which had specs that were suitable for diving. Some of the tanks were so over- engineered that you would sink thigh-deep into the mud at the bottom of the local diving hole. However, some were perfect; so much so that one of the local diving clubs went so far as to import a batch from a compnay called Kidde. We used them for years before the market eventually caught up with the needs of the divers. Some entrepeneurs of course made use of the "Midnight Divers Supply" company to fill their needs. The local town council just didn't realise that they were sponsoring the expansion of the diving community. I have not kept up with the changes in specs, but I have no doubt that some investigation will bring to light cylinders that couls be used. Is it really worth the trouble these days? Are the differences that big in price? I have a suspicion that if you find a lightweight CO2 tank with the right specs, that it will cost the same as the corresponding SCUBA tank. Good luck, and let me know if someone out there strikes gold. > > I've seen this on rec.scuba: > > > Should a scuba tank cost $150 when a CO2 cylinder costs 1/3 that? Not > >really, but there are literally millions of CO2 bottles in use around the > >world and relatively few diving bottles. If you can get as many divers in > >the water as there are people that that drink carbonated beverages you > >would see pricing go down. > > Does anybody has physical data on those CO2 tanks, like capacity, > max pressure, kind of valve thread, and the like? > > The obvious implication is "could those be easily adapted for > underwater use", say stage bottles or whatever? > > -----------------Pour la Republique Francaise du Quebec----------------- > Poverty disturbs a democracy; it shakes a republic. The former wants a > maximum of solidarity and a few donations. The latter wants a minimum of > fraternity and a lot of laws. What one makes foundations do, the other > will first ask it's ministries to do. > Regis Debray in "Are you a democrat or a republican?" > - Marc Dufour -- [\]ACUC 6 31874 & TDI -- http: will soon be relocated - > -- > Send mail for the `techdiver' mailing list to `techdiver@terra.net'. > Send subscription/archive requests to `techdiver-request@terra.net'. > Greetings Prof JG van der Walt Head: Dept. Physiology Veterinary Science University of Pretoria Onderstepoort 0110 Republic of South Africa Tel # + 27 12 529-8025 Fax # + 27 12 529-8305
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