Tube
I was asked to make a custom tube n valve for a chap recently.
I’ll make an adjustable but plate/cheek piece to finish it off.
Later, Sean.
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Now someone needs to make a aluminium or polymer M4 type forestock that attaches to the top &/or bottom rails of the frame. Add a new trigger guard & you have 1 bad ass looking Condor/Talon.
I don’t think Walter is just bitching. Pressurizing the threads seems to open up uncontrolled / unknown and more likely failure modes. Did AirArms actually say this design was a safety feature or was it just a vendor? I’ve heard salesmen come up with some really creative stuff to keep customers…
I got “Miserable and Old” right at least. 😉
Al take measures of the tubes dimension and let you do the sums.
Later, sean.
You’d better take it up with AirArms and tell em they’re doing it all wrong then.
I like the idea of the O ring in the tube also. But, lets just assume they know what they’re on with and as such, know better than you or i.
I’m not arrogant enough to think that i know better than a multi million pound company.
Perhaps they should hire you eh so you can tell em where they’re going wrong.
You could have your own office with initials on the door.
“M,O,T,I,C,O,B”
Miserable, Old, Twat, In, Charge, Of, Bitching.
Later Moticob.
LOL, I like it!!!
except twat and bitching are rather feminine…..
so need sumptin elze
Being big does not give them a pass on right.
Walter….
BTW still would like the tube info re: thinned tube wall, o.d. and thread size.
Be interested in calcing th estresses in the design.
Volt’
You’d better take it up with AirArms and tell em they’re doing it all wrong then.
I like the idea of the O ring in the tube also. But, lets just assume they know what they’re on with and as such, know better than you or i.
I’m not arrogant enough to think that i know better than a multi million pound company.
Perhaps they should hire you eh so you can tell em where they’re going wrong.
You could have your own office with initials on the door.
“M,O,T,I,C,O,B”
Miserable, Old, Twat, In, Charge, Of, Bitching.
Later Moticob.
You are correct I am confusing the tubes.
You were one of two that told Blod the supposed reason for the orings on the outboard end and the pics you show of the FX tube and fittings are sealed that way. The FX tube has the 300 BAR test value on it and yet is sealed on teh end to blow out on overfilling?
I say the better engineering would seperate functions and as a result gives a better reservoir and reduces stress on the tube ends as well as the threads due to the reduction of effective area.
If overpressure protection was the bees knees then a rupture disc that controlled the failure to the venting off of the excess pressure and preserve the integrity of the tube.
So in the end whoever came up with the story about the mushroomed tube being a safety feature is full of it.
Walter…..
.
Voltar, you seem to be confusing the tube that I used with the one that Blodnob is using, but I only posted the photo of my tube to give an idea how it looked fitted to a stealth frame. My tube and Blodnobs tube are made of completly different materials and from completly different manufacturers. The tube Blodnob has used is manufactured to yield, if filled above the reccomended pressure, so as long as you follow the manufacturers filling instructions , these tubes are perfectly safe.
That is where the mushrooming occures.
The general body ofthe tube will not fail at 300bar.
Blod, that sounds to me that you do not understand or use hydrotesting in your manufacture or line of work.
Hydrotest of any vessel will leave the unit under test in fine shape to be used for service.
A tube with a mushroomed end will not pass muster and is fit for junk and not ‘passed’ .
So the oring inboard are still the way to go.
Think its supposed to fail in the area of the O ring only as the wall thikness is redudced significantly in that area only.
That is where the mushrooming occures.
The general body ofthe tube will not fail at 300bar.
[quote=”baz”]
See on the tube it says ‘Tested 300 BAR’
so if that is the case which it would be for any hydrotest at 150% or 5/3 WP then 300 BAR is not going to stress any component beyond ‘safe’ and render the tube junk.
Am I having trouble communicating the connection between the test pressure and the impossibility of the claim that the tube will flare when overpressured?
Then overpressred with what? if the test pressure is 300 BAR and the pressure source is 300 BAR then where can a destructive over pressure come from?
Walter….
Does Steven in NC know this is how you feel ?
He should know this to be true of any pressure vessel.
If a container cannot be hydrotested without failure it is junk.
BTW thinking and knowing is done with ones mind. Feel has nothing to do with those functions.
Does Steven in NC know this is how you feel ?
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Thanks Jerry,
that is what I bin trying to say. To me it is the same as the cockamamie story about ‘droop’ salesman explanation that became legend.