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Pressure rating...

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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Pressure rating...

Unread postAuthor: deathbyDWV » Wed Jul 07, 2010 4:39 pm

So... While designing a high(er) pressure piston cannon, similar to jeepkahn's decimator, I've been thinking about metal (black and galvanzed steel) pipe. I've only heard about their pressure rating to be 150 psi. BTW I'm talking about the kinds sold at lowes...

What I'm wondering is, what pressure would 2" black or galvanized steel be relatively safe to use at?

Thanks in advance... :wink:

P.S.-- I did search, but there are so many posts that include pressure rating, I couldn't find anything... :roll: :?
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Unread postAuthor: theBOOM » Wed Jul 07, 2010 4:45 pm

Well you might want to search for DYI's cannon, I believe he used off the counter hardware parts for most of his cannon and he took it up to about 20x mix. Let me find you the link.

http://www.spudfiles.com/forums/me20h-4 ... 14452.html
There ya go :D

O and he uses 2in fittings on it.
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Unread postAuthor: deathbyDWV » Wed Jul 07, 2010 5:16 pm

Oh yeah, I didn't really think of his... So mine probably won't explode, but would be unsafe at higher pressures though... I'm thinking of co2 but I don't think I'll go for high pressure if these fittings can't take it. Maybe use co2 and just go to 200 or so psi...
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Unread postAuthor: kjjohn » Wed Jul 07, 2010 5:53 pm

This question has been asked before - I asked it.

The responses I got were that it could hold well above 150psi, more in the range of 1kpsi, and as theBOOM stated, DYI's cannon was constructed of standard fittings, and I believe he even used a plastic barrel. Pressure ratings usually use somewhat high safety factors, and in reality, the material can usually withstand significantly more pressure, even an order of magnitude more in some cases.

So yes, 2" galv will definitely hold the amount of pressure you need it to. The only concern I would have is that it may be hard to make a piston with the seam in the pipe, but I'm sure you've taken that into account, and it can easily be sanded out.
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Unread postAuthor: spudtyrrant » Wed Jul 07, 2010 6:29 pm

kjjohn wrote:The only concern I would have is that it may be hard to make a piston with the seam in the pipe, but I'm sure you've taken that into account, and it can easily be sanded out.
in some cases, such as the galvanized at true value, it is seamless on the inside :wink:
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Unread postAuthor: deathbyDWV » Wed Jul 07, 2010 7:26 pm

kjjohn wrote:The only concern I would have is that it may be hard to make a piston with the seam in the pipe, but I'm sure you've taken that into account, and it can easily be sanded out.

Yep, i did think of that... :wink:

spudtyrrant wrote:in some cases, such as the galvanized at true value, it is seamless on the inside :wink:

Thanks, I'll keep that in mind... :)

Thanks for the replies guys... :D 8)
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Unread postAuthor: Crna Legija » Wed Jul 07, 2010 11:43 pm

btbs Mr.Porter made out of 2inch galv and he took it to 500psi
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Unread postAuthor: deathbyDWV » Thu Jul 08, 2010 12:10 am

Ah yes, and that was three inch... So I think I'll be fine... Thanks for the link!!!
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