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1" Copper Pipe

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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1" Copper Pipe

Unread postAuthor: us sniper » Sun Dec 23, 2007 2:22 am

How high do you think that I could pressurize 1" copper pipe is I sheathed the whole chamber in 1" couplings? I believe to start the copper can go to 150 psi to 200 psi, correct?
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Unread postAuthor: octane89 » Sun Dec 23, 2007 2:27 am

From what I have heard before, copper is rated to 300psi, and fails at 400psi. Correct me if Im wrong though.
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Unread postAuthor: MrCrowley » Sun Dec 23, 2007 2:45 am

Depends on what it is, I think you can have K, L, M and DWV copper pipe all with different ratings.
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Unread postAuthor: Novacastrian » Sun Dec 23, 2007 3:15 am

Depends on wall thickness apparantly.

.049" 550psi
.065 700
.083 950
.095 1100
.109 1300
.120 1400

Calculation Basis: Annealed (Temper 060), seamless copper tubing ASTM B-75 or equivalent. System temperatures between -20°F and 100°F with allowable stress of 6000 psi. Ultimate tensile strength of 30,000 psi. Safety factor of 5. Reference: ANSI B 31.3 Code. (For more specific working pressure information regarding a particular tubing, consult with the actual manufacturer of the tubing.)
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Unread postAuthor: DYI » Sun Dec 23, 2007 9:28 am

From what I have heard before, copper is rated to 300psi, and fails at 400psi. Correct me if Im wrong though.


I haven't heard anything so absurdly generalised as that in quite a while.

Do you really think that a pipe would be rated for 3/4 of its burst pressure?
Firstly, there is no 1" DWV copper, DWV copper tube starts at 1-1/4"
If it is Type M (the thinnest walled and most common), it is rated for 580 psi, and has been found to burst at slightly over 3800 psi.
If it is Type L (medium strength), it is rated for 850 psi, and has been found to burst at ~5100 psi.
If it Type K (strongest type), it is rated for 1126 psi, and has been found to burst at ~7200 psi.
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Unread postAuthor: Hotwired » Sun Dec 23, 2007 2:35 pm

I believe I've posted a couple of times that all affordable sizes of domestic copper pipe have a safe working pressure of at least 300psi.

Unaffordable is where it goes over £30/m and you'd need your head looking at for buying it for a cannon :P

The lowest working pressure I know of is 54mm half hard plumbing pipe (the weakest type I've seen commonly sold). Thats 392psi.

All imperial sizes have higher ratings than metric equivalents.
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Unread postAuthor: DYI » Sun Dec 23, 2007 4:50 pm

Apart from that, copper tube has very large safety factors (~7), so you don't really need to worry about bursting any commonly available Type M copper, even with some like an unregulated nitrogen tank (although I certainly wouldn't recommend it).
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