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John:

My supplier, Puritin & Bennett list grade B oxygen as industrial (welding)
and medical.  They fill both types of bottles out of the same line. The
differance is how they fill.

For the welding bottles, they balance out, top up and analyze a sampling.

For the medical bottles, they pull a vacuum/purge/vacuum and then fill.
Each and every bottle is then gauged, has its temperature taken (to assure
that the tank will still be full when it cools), analyzed and then entered
into a logbook.

It's interesting to watch as they fill a hundred or more bottles of various
sizes at a time, several times a day.

Grade A (aviator's) and Grade B differ only in moisture content.  The
aviator's is much dryer to prevent freezing at high altitudes.  also more
expensive.

The cost in US dollars for medical grade B;

size E 21 cu.ft.  $10

     K 210 cu.ft. $15

     HH 440 cu.ft  $20

Hope this helps

Ian    

 you wrote:

>Quite often, when reading techdiver, I have come across discussions about where
>to obtain the various gases. Most references to oxygen, in particular, imply
>that "welding oxygen" is no different from "medical oxygen". If this is indeed
>the case (not forgetting that I am in the U.K.), then my club's annual
>expenditure on the fill for its emergency oxygen supply cylinder seems
>extortionate.
>
>Can anyone assure me, one way or the other, that "welding O2" is no different
>from "medical O2".
>
>Are there any differences between the grades supplied in the U.S. and those
>supplied in the U.K.?
>
>Does the U.K H.S.E have anything to say on the matter?
>
>thanks in anticipation and regards,
>
>JT

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