Bullshit - if the helium had enough of anything else in it that you could
not breathe it, it would be useless for welding. You guys are overwhelming
in the bullshit department.

----- 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
> >___
> >
> >
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