Dennis, I guess you guys need Haskel pumps for sure. What we do that may
be of use to you is to mix the back tanks rich in helium, low in oxygen,
and use stages for the dive. In cave we do not actually use the back
tanks, and if helium costs that much, I would not use them otherwise
anywhere unless I had a Haskel pump. - G



Dennis JR Harding wrote:
> 
> George,
> Hell I envy you paying US$55 for 290 cubic feet.  On average we pay double
that.
> 
> As far as the segregation of cylinders go, in South Africa there is a fairly
strict colour code
> by which all suppliers adhere.
> 
> Oxygen is supplied in black cylinders.  Inductrial grade (non vacummed) is
all black.
> Aviators, is black with the words "High Flying Oxygen" blodly appearing the
full length of
> the cylinder.  Medical oxygen, is black with a white neck.  The difference
between the last
> two is that Medical is dryer (less moisture) than the Aviators.
> 
> Helium is supplied in a brown cylinder.  Primarily the supplier would simply
place a sticker
> on the cylinder.  There is alos a size difference.  Industrial grade is in a
smaller cylinder.
> One supplier does however have a white neck on there medical grade.  This is
also accompanied
> with a spectrographic analysis.
> 
> I know that one of the suppliers here, AFROX, also known as BOC will provide
premix to your specification
> at a minimal cost above that of the gas.  They are however the most expensive
as far as the supply of Helium
> is concerned.  Here we pay around US$250 for 300 cubic feet.
> 
> Dennis.
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