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1/2 inch bore metal cannon build

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Unread postAuthor: Gippeto » Sat May 28, 2011 9:06 am

Remember to mark some measuring points on the circuference of the tank, and take pre and post hydro measurements to compare. This way you'll be able to tell if the tank has hit yield (permanent deformation).

If you don't already know...hydrotest should last 3hrs minimum.

Have you run the tubing through Barlows?
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Unread postAuthor: High-PSI » Sat May 28, 2011 9:22 am

I am more concerned about the welds than anything else. I used to be a welder for a living, though. So, I know how to weld properly. However, That is the failure point, I would expect.

I did not know the test was 3 hours. That is no problem, though. I can leave it pressurized that long.

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Unread postAuthor: High-PSI » Fri Jun 03, 2011 3:10 pm

I just got an email from Granzow (the valve manufacturer I get a discount from). I may try out a new style valve they have. It is a fast acting diaphram valve good up to 1,000 psi with a CV (they list it as KV, liters per second) of 110. Not sure how that compares to CV.

Anyway, using a scuba or large paintball tank to pressurize the primary chamber up to 1,000 psi would make this thing a freakin BEAST!

I just may have to try it. :D

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Unread postAuthor: velocity3x » Fri Jun 03, 2011 5:23 pm

High-PSI wrote:It is a fast acting diaphram valve good up to 1,000 psi with a CV (they list it as KV, liters per second) of 110. Not sure how that compares to CV.


Kv=Cubic meters per hour.
A flow of 110 liters per second would equal a Cv of 1,743.
A Cv of 110 equals a flow of about 6.9 liters per second.
A Kv of 110 equals a Cv of 483
But....I could be totally wrong. :?

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Unread postAuthor: dewey-1 » Fri Jun 03, 2011 5:29 pm

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Unread postAuthor: velocity3x » Fri Jun 03, 2011 5:47 pm



Thanks Dewey
Like I said, I could be wrong.... (as I often am)!
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Unread postAuthor: dewey-1 » Fri Jun 03, 2011 6:11 pm

No problem.
You may have been mislead by liters per second.
KV is cubic meters per hour.

My guess is that it is a 3 inch NPT valve with high pressure rating.
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Unread postAuthor: High-PSI » Fri Jun 03, 2011 6:15 pm

OK, gotcha.

This is actually a 3/4inch bore brass bodied valve.

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