Use a Co2 regulator for air?

Can I use a Co2 regulator to regulate high pressure air.  I am trying to build a high pressure system using a scuba tank or paintball/airsoft tank to operate air tools, pressurize pipes, fill tires, inflate balloons, dust work areas and computers, etcetera.  There are C02 regulators but not many 'air' regulators.  I just want to use air and not Co2.

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seandogue7 years ago
the only thing I'd be concerned about is the seals. You might want to casually ask at a gas supply house to be sure.
Goodhart7 years ago
Air pressure regulators like these?   Or perhaps you mean more like this type here?   There seems to be a myriad of Air pressure regulators out there, really. 
What's Scuba tank bottle pressure ? Commercial gas is usually at 150 Bar, or 2100  PSI. Aren't scuba tanks charged at 300 Bar ? 

NachoMahma7 years ago
.  As long as the regulator will handle the inlet pressure, it should work well. Eg, if you are using 150 psig air, the regulator should be rated to handle that on the inlet side.
.  If you are compressing your own air, it will probably have a lot of water in it, so you will need to install a good dryer (and filter) upstream of the regulator.
Air regulators are fairly cheap and readily available. They will usually be designed to handle more dirt/entrained water/&c than a CO2 regulator.
 I'm not sure.  I tried to look it up, but couldn't find any information on safety.  I don't see why you shouldn't try PROVIDED the regulator has a pressure indicator so that you don't over-pressurize and the regulator fails (VERY dangerous).  Try first with just a small pressure and see how the regulator does on controlling it.

CO2 and air have different compressibilities.  CO2 is easier to compress, it will even solidify (dry ice).  Air, mostly N2 and O2, much less so.  So at any pressure reading on a gauge, say 100 psi (about 700 kPa) would represent much less air for you to use than CO2.  In other words, the tank would run out of air more quickly.