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Short question topic

A place to ask general spud cannon related questions.
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Unread postAuthor: Gippeto » Wed Dec 28, 2011 10:36 am

wyz2285 wrote:
What "kind" of stainless? ie 304, 316, 440, etc. You need to be able to determine the yield strength of the material...can't find that if you don't know what it is.

I don´t know :? just normal stainless steel tubes used for water...
OD wound be 22mm


You use stainless for plumbing pipe? :? If that's the case, phone a plumber and ask them what type of stainless it is...look up the material properties of that type.

Will suggest you do a google search on Barlow's formula. :wink:
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Unread postAuthor: Mr.Sandman » Wed Dec 28, 2011 10:42 am

Gippeto wrote:
wyz2285 wrote:
What "kind" of stainless? ie 304, 316, 440, etc. You need to be able to determine the yield strength of the material...can't find that if you don't know what it is.

I don´t know :? just normal stainless steel tubes used for water...
OD wound be 22mm


You use stainless for plumbing pipe? :? If that's the case, phone a plumber and ask them what type of stainless it is...look up the material properties of that type.

Will suggest you do a google search on Barlow's formula. :wink:

My humble suggestion is to assume that it will be unsafe, and buy pressure rated pipe. You may be spending more money, but personally I'd rather spend a few dollars here, than a few hundred dollars in the emergency room if the pipe in question were to give way to the pressure.
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Unread postAuthor: SpudBlaster15 » Wed Dec 28, 2011 3:05 pm

wyz2285 wrote:Hi I´m making a new pcp rifle, and I´m planing using a stainless steel tube as chamber, 0.75mm wall. Is it safe to use 1000 psi with it?


Gippeto wrote:What "kind" of stainless?


wyz2285 wrote:I don´t know :?


How is anyone supposed to estimate a safe working pressure for your tubing if you can't even provide information on the material grade?
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Unread postAuthor: sl33k » Wed Dec 28, 2011 7:25 pm

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Unread postAuthor: wyz2285 » Sat Dec 31, 2011 6:17 am

The type is INOX 1.4301 pipe I think, it´s wirtten on it, but it also says AISI 305 and EN 10312 :?
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Unread postAuthor: dewey-1 » Sat Dec 31, 2011 7:29 am

1.4301 is 304 type.

INOX information:

http://www.euro-inox.org/pdf/map/What_i ... eel_EN.pdf
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Unread postAuthor: wyz2285 » Sat Dec 31, 2011 12:27 pm

So is it safe?(kind lasy to read all the pdf :lol: )
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Unread postAuthor: jackssmirkingrevenge » Sun Jan 01, 2012 4:46 am

Yes, any fittings you make will fail long before the pipe itself does.
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Unread postAuthor: Lockednloaded » Mon Jan 02, 2012 7:23 pm

Would there be a noticeable difference in performance between a barrel sealer and a chamber sealer inside the same tee sealing against a 1/2" nipple?
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Unread postAuthor: ramses » Mon Jan 02, 2012 8:24 pm

Possibly. The one with the seat ratio closest to 1:1 would perform better. It would allow the pilot to be more empty when the valve opened, so it would experience more force for a greater opening time. For a reasonable tee size and port diameter, this is the barrel sealer

Also, the chamber sealer will likely have more dead volume.

http://www.spudfiles.com/spud_wiki/inde ... ston_Valve
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Unread postAuthor: Gun Freak » Mon Jan 02, 2012 8:50 pm

It would allow the pilot to be more empty when the valve opened, so it would experience more force for a greater opening time.

Not sure if you mean better time or bigger time. Because it would be a shorter opening time.
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Unread postAuthor: Lockednloaded » Sun Jan 08, 2012 10:39 pm

I know that golf balls are about 1.68", but how consistent are they? Would they get jammed in a 1.68 ID aluminum tube?
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Unread postAuthor: ramses » Sun Jan 08, 2012 10:59 pm

Gun Freak wrote:
It would allow the pilot to be more empty when the valve opened, so it would experience more force for a greater opening time.

Not sure if you mean better time or bigger time. Because it would be a shorter opening time.



Damn, that was pretty dumb wording.

I have a short question of my own:

Is there a reasonable way to exceed the performance of the following cannon scheme without going hybrid?

Barrel limited to 4-6" long

1. Fill chamber completely with liquid nitrogen (no gas space)
2. Seal chamber
3. Allow LN2 to "evaporate" into supercricical fluid
4. Dump with balanced hammer valve.

This would theoretically give me about 700 bar (expansion ratio of LN2 is ~1:700. Liquid Helium, Hydrogen, Oxygen, and Neon are higher, but more expensive or reactive.
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Unread postAuthor: Gun Freak » Sun Jan 08, 2012 11:30 pm

Out of curiosity, what is the bore of said setup?
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Unread postAuthor: jackssmirkingrevenge » Mon Jan 09, 2012 2:04 am

ramses wrote:4. Dump with balanced hammer valve.


I would favour exhaust valve + detent.

One would question the point though ;)
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