Re: [PSUBS-MAILIST] Hydrogen Peroxide

[MerlinSub@t-online.de (Carsten Standfuß)]

Sgt.Peppers pressure hull was built in a factory witch also
produce welding and medicine oxygen. The Main-engineer from the
factory told me that it is the same gas from the same source. 
The only difference is that medicine oxygen is dryer than welding
oyxgen.
The reason for that are the pressure-regulators in the medicine
equiment. 
The other differens is the price you have to pay for medicine Oxygen..

Carsten

"Sean T. Stevenson" schrieb:
> 
> The oxygen does indeed come from the same source.  The only difference
> between the welding stuff and the medical grade is the filling process
> - welding tanks have one vacuum pulled on them, while the medical tanks
> have a vacuum, are flushed with oxygen, have another vacuum pulled, and
> then are filled.  That and the medical tanks are analyzed and certified
> as to their hydrocarbon, CO, moisture content, etc.  One industry
> insider told me that the information would be identical to the welding
> gas if you analyzed it.  The scenario you describe seems unlikely,
> unless it occurred a long time ago, or with a shady supplier.
> 
> The gas analysis and tracking of the medical grade is just a liability
> thing, but at a cost, which they kindly pass on to you.  Don't ask,
> don't tell seems to be the policy with the gas suppliers - if you say
> you are using it for diving, they insist on the USP (medical) gas
> grades for liability reasons.  I know a few people who have been diving
> for years on welding O2 and balloon helium without incident.  Also, gas
> prices seem to fluctuate greatly between suppliers, and even between
> outlets of the same supplier!  A bit of haggling can't hurt - as with
> everything else in life, you don't get what you deserve, you get what
> you negotiate.
> 
> -Sean
> 
> On Sat, 24 Jun 2000 13:42:55 EDT, Subscuba@aol.com wrote:
> 
> >Vance,
> >
> >Divers in the local area used to use a home cooked (partial pressure) method
> >of mixing gases to get "Hyperoxy," now called Nitrox. The source of the gas
> >was from the local welding shop as you have suggested.
> >
> >One diver used the oxygen and died from it. Seems like CO (carbon monoxide)
> >was allowed as a contaminate in the welding gas. Since the gas was being used
> >not as a welding gas, his widow didn't have much luck with a lawsuit. Of
> >course, even with a successful lawsuit, it wouldn't have helped the diver.
> >
> >Medical grade oxygen has much tighter quality control and might be safer to
> >use. I know the source of the oxygen is the same.
> >
> >I toured the Ben Franklin when it was in West Palm. I understand there was a
> >report written after the voyage (The Gulf Stream Mission), do you know where
> >the report might be found? I saw the LOX storage tanks used on board and they
> >weren't too big about 3 feet high and 2 feet dia. I don't know how many they
> >had on board.
> >
> >Thanks,
> >
> >Ken Martindale
> >