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Old 08-18-2012, 09:08 AM   #3078
victor441
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Joined: Jul 2009
Location: Sonoma, Calif.
Oddometer: 789
pressure change with temperature....also tube notching

is proportional to the change in degrees kelvin, so the pressure increase for a gas bottle going say from 70F to 120F is not all that great... i.e. P1/T1 = P2/T2 or P2= (P1*T2)/T1 P2= P1 * (322/294) so P2 is about 10% higher
http://en.wikipedia.org/wiki/Gas_laws

on a unrelated welding topic just made a rack out of 1/2" tubing (not finished yet in the photo) and discovered a 12" round file is just the right size to notch the tubes and works quickly if the notch is started w/ an angle grinder...have a hole saw type notcher but AFAIK hole saws are only available as small as 3/4"

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