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Old January 25th, 2011, 01:59   #8
MadMax
Delierious Designer of Dastardly Detonations
 
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Join Date: Dec 2001
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at 10C (50F) you follow an isotherm at about 650psi (horizontal line labeled 50F where you get liquid-gas saturation). At -10C (14F) you get an isotherm at 400psi. 38% pressure drop across the temperatures you specified. Unless you're shooting from a regulated supply of CO2, you're going to see significant performance variation across your specified temp range.

Don't even bother with propane.

http://www.engineeringtoolbox.com/pr...re-d_1020.html

Swing from 78psi to 38psi. The higher pressure is already borderline acceptable (about the same as HFC134a at 20C).
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