Mailing List Archive Mailing List Archive
Alex, these guys don't get anything that involves real life - they are brainwashed by dive industry crap. Like I said, if it is good enough to use on welding aluminum, I'll breathe it. It is helium, and it comes from the same tank as the medical into a vessel that has been vacuumed. ----- Original Message ----- From: Alex Varouxis <alexv@er*.co*> To: <techdiver@aquanaut.com> Sent: Tuesday, October 03, 2000 8:13 PM Subject: RE: welding He good ? > For every % of contamination the quality weld diminishes. This is in both > oxygen welding and cutting and the use of gas for shielding. Industry does > not throw money out the window. > > > ----- Original Message ----- > From: Hans Petter Roverud <proverud@on*.no*> > To: Aldo P. Solari [APS] <aldo.solari@ho*.se*>; <techdiver@aquanaut.com> > Sent: Sunday, October 01, 2000 5:27 PM > Subject: Re: welding He good ? > > > > According to my gas supplier there's one grade we should definitely avoid, > > namely balloon helium. They receive helium as cryogenic gas and evaporate > > it to fill storage cylinders. The first batches of this distillation > > process will be sold as balloon helium since it tends to contain > > impurities. In some countries they add a little oxygen to balloon helium > to > > avoid the risks of hypoxia if people breathe it but that's another issue. > > Expect balloon helium to be impure while all certified grades should be > OK. > > Check the specs of welding grade in your country and be particularly > > concerned if it allows CO2. (Typically, impure helium may contain neon, > > methane and CO2). > > > > regards, > > > > Hans > > > > At 04:27 AM 10/1/00 +0100, Aldo P. Solari [APS] wrote: > > >Dear senior tech divers: > > > > > >Some of the senior tech divers stated that "welding helium would be > > >good for diving mixes/breathing". > > > > > >In Canary Islands (1200 km from nearest euro port), there is no > > >"medical grade" Helium but there is He for welding (it comes in > > >50 Lt tanks and the cost is around 355 USDollars each). > > > > > >My questions are as follows: > > > > > >(1) Has any one run any anylses (gas chromatography, whatever) on > > >welding grade helium ? > > > > > >(2) Those of you who have used welding grade He: do you use any > > >special filters to clean up impurities ? > > > > > >Any other info would be mostly appreciated. > > > > > >If welding He is enough good, it would open up a new world to > > >divers on the islands, here. > > > > > >Thank you for your comments. > > > > > >cheers, > > > > > > aldo > > > > > >aldo.solari@ho*.se* > > >www.ccbb.ulpgc.es/fish-ecology/solaris > > >___ > > > > > > > > >-- > > >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'. > > -- > 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'. -- Send mail for the `techdiver' mailing list to `techdiver@aquanaut.com'. Send subscribe/unsubscribe requests to `techdiver-request@aquanaut.com'.
Navigate by Author:
[Previous]
[Next]
[Author Search Index]
Navigate by Subject:
[Previous]
[Next]
[Subject Search Index]
[Send Reply] [Send Message with New Topic]
[Search Selection] [Mailing List Home] [Home]