NITROGEN

yea sounds like the regulator to me or the bottle wasnt opened up all the way. 

how is it that the guy at my welding supply store said that these bottles in the sun will expand inside bottle gauge was bought last friday from another welding supply store

Edited: 6/10/2009 12:09:37 PM by Layumon22s

Edited: 6/10/2009 11:58:18 AM by Layumon22sEdited: 6/10/2009 11:56:22 AM by Layumon22syeah to go from 100 to 1200 PSI would take way more than even a 30 degree F swing.  and no when the gas expands to 100 PSI you only have 100 PSI to work with even though it once was at 1200 PSI.   this is a constant volume process so actually all you need is  T1*P2 = T2*P1  assuming T1 = 90F, P1 = 1200 psi, P2 = 100 psisolving for T2 gives 7.5Fwhich means it would take a 82.5 F temp change to do that, so basically it wasn't the temp, you have another problem

i never said it was usable air its not trust me lol i just thought it was funny cause i knew it was empty take it out go to coastal welding..dude says bottle has 1200 pounds,would you like to use it and then come back later..in my head was thinkin just two days ago had 100 pounds.came home hooked up to truck tried to lift it and it very quickly lost its pressure lol...just thought it was funny at the time..