tube reservoir question
i was wondering, with a “normal” tube reservoir gun (mrod, disco, AA rifles), how much does the reservoir expand by when it gets filled?
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Usually to 5-10% of expansion, otherwise i fail it.
i also did some test with Ti grade 5,6063,6061 & 4130 steel. i always make my end caps from 7075
But i made a few ti’ Airarms replacments and they didn’t fail untill nearly 10,000psi. and that was at the thinest part where the O ring sits. That part was only 1.3mm thick. The OD was stable up to 3000psi. Good weight saving too.
Tested 6082 T6 ally’ and although it passeds the pressure test, it didn’t retun to accetable limits. I have a video of testing ti’ and ally’ to destruction.
I made a rig that can hydro’ up to 100’000psi. Reaches 3000psi in just 4 pumps. Al dig pic’s out and post on a seperate thread.
I would like to be able to use the 7175 ally’ tube. But it has to come from your side of the water and worked out at about £212 per foot.
More expensive than Ti’.
Later, Sean.
Did a bit of testing with titanium tubes a while back. There are limits that it must return to to be considered safe. cant find the numbers at the moment. Al have a look for them.
But i made a few ti’ Airarms replacments and they didn’t fail untill nearly 10,000psi. and that was at the thinest part where the O ring sits. That part was only 1.3mm thick. The OD was stable up to 3000psi. Good weight saving too.
Tested 6082 T6 ally’ and although it passeds the pressure test, it didn’t retun to accetable limits. I have a video of testing ti’ and ally’ to destruction.
I made a rig that can hydro’ up to 100’000psi. Reaches 3000psi in just 4 pumps. Al dig pic’s out and post on a seperate thread.
I would like to be able to use the 7175 ally’ tube. But it has to come from your side of the water and worked out at about £212 per foot.
More expensive than Ti’.
Later, Sean.
Ditto
7/8″ od x .065″ 4130 reservoir increases in diameter by roughly .001″ during hydrotest @ 5000psi.
Larger tubes may expand to a greater extent.
Whacha doin? 🙂
Viewing 5 replies - 1 through 5 (of 5 total)
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i was just wondering so i could get clearances for a stock, and a barrel shroud. im getting a southern airguns’ conversion tube for a .25 im working on. i was also wondering, has anyone happen to have tested the discovery fill plug? i think southern airguns go to 3200 psi fill, and i know that the disco is only filled to 2k. or could someone build me a fill plug that uses the disco fill cap, is threaded into the tube the same as a disco plug, but is safe to use for a 3200 psi gun? i dont like the fill plug just chillin out in the wind…its an aesthetics thing for me. and protection for the fill nipple… thanks again guys!! it’ll be a while before the rifles done, but i really think you guys will like this build!!!!