CO2 Injection Options

["Colin Anderson" <colin_d_anderson at hotmail_com>]

This may be a silly, possibly dangerous question, but I think it 
warrants asking.  Has anyone used an alternative to the very highly 
compressed cylinders for CO2 injection?  What is the pressure inside a 
C02 cylinder?  If we used a different storage vessel, could we use a 
more economical set of delivery equipment?

I'm sorry, I'm not quite up to speed on this, but I'd like a jump start.  
Does anyone have a DIY Cylinder driven delivery page out there that they 
really like?  

What I'm really thinking about is a lower pressure, lower volume system.  
A potential storage vessel could be a plain old air tank used to top up 
car tires, not a compressor, just a tank.  Then you could keep the 
pressure down to 25 or 50 psi, or whatever was effective given your 
delivery system.  25 or 50 psi might still last 6 months, which I could 
live with if the cost was cut in say, half or a third.  One problem may 
be getting the C02 into the tank, but we'll cross that river later.  
I've got a 135 gallon, so I could hide a reasonably large 'air' tank.

Would using a lower initial pressure system decrease the cost of the 
regulators that we must use?  How about that terrible needle valve that 
seems to cost 75 bucks cdn?  

Any ideas?

Colin "I'm ready for CO2, but my wallet isn't" Anderson

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