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My New Cannon BIG BOY and Some Questions with Pics!

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: MrCrowley » Sun Jan 04, 2009 4:43 pm

Braddubya wrote:how can i tell if its pressure rated? Is there a code on it of some type or will they all just say the pressure?

*facepalmheaddeskcombo*

Read my first post in this thread where I specifically say how to identify pressure rated pipe/fittings by reading this:
http://www.spudfiles.com/spud_wiki/inde ... _Rated_PVC

:roll:
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Unread postAuthor: irisher » Sun Jan 04, 2009 4:45 pm

It should be written somewhere along the length of the pipe.
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Unread postAuthor: MrCrowley » Sun Jan 04, 2009 4:47 pm

irisher wrote:It should be written somewhere along the length of the pipe.

Yes, but Sch 40 NSF-PW probably doesn't mean much to him if he doesn't know what it means. :roll:

That's where my article I posted above comes in to play.
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Unread postAuthor: irisher » Sun Jan 04, 2009 4:49 pm

Often times a precise psi is given as well.
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Unread postAuthor: MrCrowley » Sun Jan 04, 2009 4:52 pm

irisher wrote:Often times a precise psi is given as well.

Yes but not all the time, and sometimes it even says NSF-DWV along with a pressure rating which will confuse him even more after he's had half the forum yelling at him not to use DWV.
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Unread postAuthor: irisher » Sun Jan 04, 2009 4:58 pm

In America the psi is given on all pipe.
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Unread postAuthor: Braddubya » Sun Jan 04, 2009 5:00 pm

im reading that article now thanks I missed it the first time reading through the posts

Seeing as now pretty much everything on the cannon is useless what would you guys think the "safe" operating pressure would be so that I can still use it a little? I pumped and fired it at 80psi once right before reading all of this and had no problems putting a baseball into orbit and I read in the Wiki that some people use it the dwv anywhere from 80-120psi....so I if I kept it under lets say 60psi would it be atleast decently safe?
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Unread postAuthor: MrCrowley » Sun Jan 04, 2009 5:51 pm

irisher wrote:In America the psi is given on all pipe.

http://www.spudfiles.com/forums/new-coa ... 15485.html
http://www.spudfiles.com/forums/demetri ... 12209.html
http://www.spudfiles.com/forums/coaxial ... 12779.html

Those three cannons don't appear to display a pressure rating. I can clearly read the D1785 rating on two of them and the other one has a D2665 standard.

According to this website the pressure rating should come immediately after the D1785 standard printed on the pipe. In both cases, it doesn't. And all three don't display a PSI rating:
http://www.jains.com/Pipefittings/pvc%2 ... 0pipes.htm

And this website seems to say the D1785 standard doesn't need to display a pressure rating, just a schedule, though D2241 does display a pressure rating:
http://www.markturner.com/engineer/pvc.htm

Sorry for the long wait, it took forever to find some good examples. A PSI rating appears on most American pipe by the looks, but i'm sure it doesn't appear on all pressure rated pipe. Even if it did, it can still display NSF-DWV which would confuse people who don't read the article.
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Unread postAuthor: Braddubya » Sun Jan 04, 2009 7:10 pm

Anyone think it would be ok to still use if only filled to lower pressures?
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Unread postAuthor: starman » Sun Jan 04, 2009 7:36 pm

Braddubya wrote:Anyone think it would be ok to still use if only filled to lower pressures?


No, saw it up and bury it.

And, when you rebuild it with pressure parts, make the U in the back the same size as your barrel...unnecessary choke point.
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Last edited by starman on Sun Jan 04, 2009 7:50 pm, edited 1 time in total.
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Unread postAuthor: Daltonultra » Sun Jan 04, 2009 7:45 pm

Braddubya wrote:Anyone think it would be ok to still use if only filled to lower pressures?


No way. Cellular core is strictly zero-pressure. The design itself is great, though. Copy the design into NSF-PW and take a hammer to the old one.

I'd replace the ball valve with a modded sprinkler, though.
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Unread postAuthor: iisthemuffin » Sun Jan 04, 2009 7:51 pm

If it says cellular core then its deffinetely not ok to use. No matter how cheap. DWV is not ok if its not pressure rated. Where i live, all the pipe above 1 inch is DWV but is also pressure rated so completely safe to use.

However DWV fittings are almost never ok to use because they are rarely pressure rated. If you can find a pressure rated DWV fitting for cheap, by all means use it. For fittings though, you want to look for something that says nsf-pw on it if there is no pressure rating. Which means its pressure rated.
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Last edited by iisthemuffin on Sun Jan 04, 2009 7:55 pm, edited 1 time in total.
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Unread postAuthor: Braddubya » Sun Jan 04, 2009 7:52 pm

alright...it just seems like such a waste! but i understand what you guys are saying and theres no use in putting myself at risk. Stay tuned for updates because ive got some bigger better ideas as well
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Unread postAuthor: starman » Sun Jan 04, 2009 7:57 pm

The waste would be you getting injured and us sitting by not saying anything.

You are on the right track, especially for your first...just take it to the next step.
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Unread postAuthor: jrrdw » Sun Jan 04, 2009 8:36 pm

starman wrote:The waste would be you getting injured and us sitting by not saying anything.

You are on the right track, especially for your first...just take it to the next step.


You said it all right there! :D
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