1/2 inch bore metal cannon build

[Gippeto]

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?

[High-PSI]

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.

Matt

[High-PSI]

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.

Matt

[velocity3x]

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.

_________________
A government big enough to give you everything you want is big enough to take everything you have.

[dewey-1]

1.16 x KV = CV

http://www.engineeringtoolbox.com/flow- ... d_238.html

[velocity3x]

1.16 x KV = CV

http://www.engineeringtoolbox.com/flow- ... d_238.html

Thanks Dewey
Like I said, I could be wrong.... (as I often am)!

[dewey-1]

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.

[High-PSI]

OK, gotcha.

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

Matt