SpudFiles

I rode my bike to Consolidated Plastic Supply and looked through their scrap yard of pipes. There, I found Sch 40 4" PVC conduit and Sch 40 2.5" PVC conduit. With these pipes I am hoping to build a coaxial pneumatic. I asked two different guys there if the 4" conduit would be suitable for a gas pressure application of 100psi. Both of them said that the conduit and the White PVC for potable water are manufactured with the same process and that they are identical in strength except the conduit is gray. One guy said the pipe was rated to 133psi (I could tell he used engineering toolbox) and the other said that is was rated to 223 psi because he saw it written on the side of a pipe that it used to be apart of. Are this guys just trying to get me to take their leftover pipe despite the risk of the pipe blowing up?

I have had the same mixed statements regarding PVC conduit.. I use it with no problems.

My 1/2 inch barrel for AA batteries is a piece of leftover conduit.

The 2.5 inch reducer for the tennis ball barrel is a conduit fitting.

I am sure that conduit fittings hold up fine, but I don't know about an entire chamber especially with such a large diameter.

auxiliary wrote:I am sure that conduit fittings hold up fine, but I don't know about an entire chamber especially with such a large diameter.

I don't have a pic handy, but I also have a 2.5 inch barrel. For the t shirts the ID proved to be too small. It is also heavier than the thinwall stuff.

Had no issues with it at pressure, but stuck with the thinwall for the contest. Sched 40 PVC is heavy..

The 6 inch chamber PVC Dragon cannon is too heavy to be pratical as a hand held.. Did much better going to steel. Much lighter for the chamber size.

auxiliary wrote: Both of them said that the conduit and the White PVC for potable water are manufactured with the same process and that they are identical in strength except the conduit is gray.

Conduit IS gray but, some PVC potable water pipe is manufactured in gray also. It's has more wall thickness than white PVC sch80 and is used where pipe threading is required.
http://www.usplastic.com/catalog/produ ... e%5Ftest=1

velocity3x wrote:

auxiliary wrote: Both of them said that the conduit and the White PVC for potable water are manufactured with the same process and that they are identical in strength except the conduit is gray.

Conduit IS gray but, some PVC potable water pipe is manufactured in gray also. It's has more wall thickness than white PVC sch80 and is used where pipe threading is required.
http://www.usplastic.com/catalog/produ ... e%5Ftest=1

I guess I should have been specific.. The 2.5 inch grey parts were purchased from the electrical section along with a length of Grey Schedule 40 PVC Conduit. It's cooled down.. I grabbed the camera.. The 2.5 inch is painted.. The end I cut off doesn't have markings.. Sorry. Grabbed a shot of the 1/2 inch conduit barrel tool.