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PSI and materials

Post about things you have launched or thought about launching. Also post about various materials used for building cannons. No posts about explosive projectiles!
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PSI and materials

Unread postAuthor: POS » Mon Sep 18, 2006 2:55 am

We all know that the PVC high pressure pipes have their max PSI printed on them, so no problem there.

Do any of you know the max psi of copper pipes, galanised pipes, steel pipes or non printed, no higg pressure PVC ??
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Unread postAuthor: killagorrila99 » Mon Sep 18, 2006 3:05 am

I think copper is 35 bar
galvonised - 80 bar
Steel - 40 bar
Please for the love of god, dont use non printed pipe.
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Unread postAuthor: POS » Mon Sep 18, 2006 3:11 am

killagorrila99 wrote:I think copper is 35 bar
galvonised - 80 bar
Steel - 40 bar
Please for the love of god, dont use non printed pipe.


I am not much with thinking, now am i :) What if you think wrong, and it blows up in my face.

Now, I am not using pressure above 10 bar (140 psi) for the moment, so that's ok. I was just curious
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Unread postAuthor: killagorrila99 » Mon Sep 18, 2006 3:26 am

By "think" I meant that copper caves in at 35bar.
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Unread postAuthor: Jolly Roger » Mon Sep 18, 2006 3:49 am

Dude wtf? That is completely wrong, no ways about it. It all depends on the schedule of pipe, the circumference of the pipe and what type of steel, copper, gal or whatever you are using. There are literallly hundreds of different types of steel avaibliabe.. Some carbon steel pipes are capable of pressures over 30, 000psi! Heres a link that I often use for different pipes. http://www.engineeringtoolbox.com/pipes-pressure-rating-t_40.html Searching for ANSI, ASTM or ASME (for engineers) for piping pressure standards etc. should yeild you a heap of results for
a all sorts of pipe specifications including working pressures and bursting pressures.
Note: Those are American standards, and you may have to purchase them. I live in Australia but I'm guessing most Uni's elsewhere would also have access to their own standards online.
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Last edited by Jolly Roger on Mon Sep 18, 2006 4:07 am, edited 1 time in total.
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Unread postAuthor: MrCrowley » Mon Sep 18, 2006 3:57 am

some guy said that before on another thread didnt they?
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Unread postAuthor: POS » Mon Sep 18, 2006 4:09 am

Bottom line, at a pressure around 150 psi i won't burst any metal pipe.

What about aluminium pipes ?
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Unread postAuthor: BT1969 » Thu Oct 05, 2006 12:41 am

Has anyone tried ENT conduit, or EMT conduit? The EMT can be welded, and is stronger. The ENT has nice long curves for the elbows, and full thickness fittings. However, the kinds of fittings are limited as compared to the white PVC fittings. How about the 16 guage and commercial grade of galvanized fence pipe used with chain link? What pressures have people tried successfully with their pneumatic cannons? How about range and power with different ammo?
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Unread postAuthor: jon2680 » Thu Nov 23, 2006 6:13 pm

MrCrowley wrote:some guy said that before on another thread didnt they?


yah I did, but I'm not arduing with anyone. Not worth my time.
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Unread postAuthor: SpudStuff » Thu Nov 23, 2006 7:38 pm

NOOOO!
Galvinised steel pipe (sch 40) is rated to 150 PSI ONLY! Not 80 Bar!
The pipe comes in three schedules:
Schedule 40=150 PSI
Schedule 80=300 PSI
Schedule 160= 3000 PSI

The coating (galvinized, black, ect) has nothing to do with the pressure rating.

Copper is rated according to size.
1/8"-1/2"= 1000 PSI
3/4"-1 1/4"=750PSI
1 1/2" and above=500 PSI
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Unread postAuthor: drac » Thu Nov 23, 2006 8:07 pm

Spudstuff, that's the pressure at which the threads will leak. The pipe will hold much more than that before bursting.

It however, will not hold 80 bar, maybe 20-30
but not 80
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Unread postAuthor: GalFisk » Fri Nov 24, 2006 7:32 am

Burst pressure depends on the material, thickness, and pipe circumference (and temperature, but that is not relevant when it comes to copper and spudguns).
Pressure ratings are very conservative (1/3 to 1/4 of burst pressure).
Annealed (soft) copper has much lower ratings than drawn copper.
Here are some formulas and tables about pressure and burst ratings of copper tube:
http://www.copper.org/applications/plum ... _burst.htm
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Unread postAuthor: CpTn_lAw » Fri Nov 24, 2006 7:45 am

i'm sorry but a 15mm gal. pipe is 2-3 mm thick, thats two and three time thicker than copper...so, i holds more pressure.another thing
take a big hammer, and hit a copper pipe. it bends.
Take the same big hamer and hit a galvanized steel pipe of the same diameter, it only makes a small and unnoticeable mark.
I'm using 1/2" galvanized stele pipe often at 160-200 psi and it dosen't leak, i dosen't show an sign of stress.please revise your knoledge concerning pressure ratings before saying stupid things
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