SpudFiles

Before everyone tells me to search, let me tell you that i did search the site and google and didnt find anything.

Im building a copper QEV gun and i went to home depot for some pipe and the only size copper pipe that they had was type M copper. I need to know what kind of pressure it is good for. i want it to be safe for 130 psi with room to spare. is it? it isnt very thick, but its thicker than L isnt it?

Lets just say that i did the absolute best soldering job ever, how much pressure can it hold without a fitting poping off? how much pressure can it hold with a sloppy poor soldering job that is air tight?

thanks, HI

http://plumbing.hardwarestore.com/52-29 ... 00235.aspx

i also wanted to know what pressure copper pipe was good for, i didn't find much, but here is a 3/4 type M copper pipe, its maximum pressure is 407 psi, the wall on this is 0.032 (inch) thick. hope that helps

WHERE:

P = allowable pressure, psi
S = maximum allowable stress in tension, psi
tmin = wall thickness (min.), in.
Dmax = outside diameter (max.), in.
C = a constant

For copper tube, because of copper's superior corrosion resistance, the B31 code permits the factor C to be zero. Thus the formula becomes:



The pressures at which copper tube will actually burst are many times the rated working pressures. The very conservative working pressure ratings give added assurance that pressurized systems will operate successfully for long periods of time.

Actual burst pressure at room temperature

Copy + paste FTW

all i know is almost all copper pipe is rated to a high standard. it probably goes for almost everyother type of metal pipe. i dont know what mine is rated to but im still using it for a pneumatic.

dont worry about a fitting poping off the solder joint is stronger than the pipe especially if u braze it or use silver solder