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> 
> A low pressure O2 line is attached at the intake to your compressor.  
> Depending on the flow rate through this line you control the %O2 coming 
> out of the compressor.  This is done using a flowmeter. >
> 

Also, be sure the commessor's lubricants and soft parts are O2 compatable.
The elevated O2 levels will eat up some types of rubber faster than
others. Rix compressors seem to be the best for these apps. 

>  I can have my cylinder cleaned, and then just fill it with my own >
> 
<snip>
> for a VIP, cylinder cleaning (and tumble if needed), O2 compatible parts 
> and lube ( this is expensive stuff-about $40 for a little tube), and a 

You are getting ripped off on your Cystalube. $40 will buy you enough
to do hundreds of tanks. It's approx 5 times the cost of sillicone, but
it shouldn't be a noticable cost in cleaning. Many people put gobs of
the stuff in the threads. You only need a tiny bit. You just want to
antiseize the threads, not fully lubricate them like a car's ball joints.

The Viton O-rings are the expensive part. You'll pay $2 or $3 for the 
tank O-ring as compared to 10 or 15 cents for normal rubber.

Stephen Galperin

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