maggotman wrote:I think you will find that i am well with in my limits working with copper. pipe
http://www.airlink-compressors.co.uk/Tu ... r_tube.htm
near the bottom copper pluming pipe.
And I think you'll find I know what I'm talking about - the site you've chosen to provide your data has mixed up psi and bar (which it certainly has), and you'll trust those berks over me?
Trust me, do not take UK copper, unless you've sourced the very rare and expensive thickwall variety, beyond 500 psi. I mean it.
If you take 22mm copper to 1000 psi, it won't burst, but it will stretch permanently outwards under the force - it will take the force once, and then most likely be useless to you, because it'll be the wrong damn shape. The presence of the conduit will affect things slightly - but even at best, you're going to be right on the wire.
I am not going to disagree what I am doing is not the cleverest of things but if i thought i was going to get blasted with bits of shrapnel under very high pressures i would not be doing it.
There is a difference between whether I think you're going to get shrapnel blasted, and whether you think that you're going to get shrapnel blasted.
This is an important difference. The difference is that if you go with what you say, and you're wrong about the safety limits, you potentially get injured and become the proud owner of a pile of scrap.
If you go with what I say, and I'm wrong about the safety limits, then no one gets hurt, and your cannon is still plenty powerful.
Be sensible. Err on the side of caution - I am not a moron (I'm also wearing full body armour*) and I am doing a degree in engineering - my knowledge of materials, safety limits and parts failure is not lax.
*Woo, slightly obscure reference for the win!