Affirmative.

My information comes from the boss, who was lead gas mixer at NEDU, and a
1st Class Diver for ten years.

All that gas comes out of the same tube truck.

Scott


----- Original Message -----
From: Flank, Bernard <Bernard.Flank@tu*.co*>
To: 'Scott' <scottk@hc*.co*>; Capt JT <captjt@mi*.co*>;
<techdiver@aquanaut.com>
Sent: Monday, October 02, 2000 7:11 AM
Subject: RE: clarification was: An the beat goes on and on


> FWIW, the Navy's standards for Helium are (from the US Navy Diving
Manual):
>
> --------------------------------------------------------------------------
---------------------
> 4-3.3 Diver's Breathing Helium. Helium used for diver's breathing gas
shall
>       meet Military Specification, MIL-P-27407B Propellant Pressurizing
>       Agent Helium, Type I Gaseous Grade B, Respirable Helium. The purity
>       standards are contained in Table4-4.
>
> Table 4-4. Diver's Compressed Helium Breathing Purity Requirements.
> Constituent Specification
> Helium (percent by volume) 99.997%
> Moisture (water vapor) 7 ppm (max)
> Dew Point (not greater than) -78°F
> Hydrocarbons (as Methane) 1 ppm (max)
> Oxygen 3 ppm (max)
> Nitrogen + Argon 5 ppm (max)
> Neon 23 ppm (max)
> Hydrogen 1 ppm (max)
> Reference: Military Specification MIL-PRF-27407B
> --------------------------------------------------------------------------
---------------------
>
> Acceptable certification of this gas purity is unlikely to be available
with welding grade He.  Doesn't mean the He isn't just as good - just means
it's not been documented.
>
> Using Navy standards to discuss non-military diving may be comparing
apples and oranges.
>
> B.L. Flank
>
> -----Original Message-----
> From: Scott [mailto:scottk@hc*.co*]
> Sent: Sunday, October 01, 2000 8:00 AM
> To: Capt JT; techdiver@aquanaut.com; Trey
> Subject: Re: clarification was: An the beat goes on and on
>
>
>
> JT wrote:
>
>
> > The
> > only
> > > draw back is what the shop has to pay for the He and then it is past
on
> to
> > > the diver, if it was not for the "Lawyers" who would surely say it is
> > > unsafe in court to make a buck , everyone would be using welding gas.
>
> I think this is a bullshit issue, easily shot in the ass.
>
> As far as I know, there is no *law* saying you must use USP gas for
diving,
> the Navy certainly doesn't. I have gas blender shingles from IANTD and
TDI,
> and both texts suggest very strongly that USP be used, but I am aware of
no
> legal requirement. I will concede right now that I could be wrong here,
and
> if I am, would someone with the dope please post it, code and all.
>
> With O2, its remotely possible for a welding shop with crap equipment (no
> check valves) and idiots at the torches, to back fill acetylene into an O2
> bottle. Even so, the bottles are evacuated before filling, or we would
have
> some gas suppliers with holes in their buildings. No such problem exists
> with He. He is used as a shield gas for Tungsten Inert Gas welding (TIG),
> and is *never* (in my experience) connected to any system that has another
> gas connected to it, least of all a flammable gas, as He is inert. Any
> contaminants in the He would seriously affect weld quality, and since He
is
> used to weld exotic metals (spelled "$$$$") used mostly in Aerospace, I
have
> no problems what so ever with using industrial He. The chances of a gas
> supplier getting sued for selling bad gas, and causing an airplane with
100
> people to fall screaming to their deaths, is much more likely than a suit
> involving SCUBA divers.
>
> We use ABO and industrial grade He.
>
> Scott
>
>
>
> --
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