SpudFiles

its a price we all have to pay my friend (if you own a hybrid that is)

_Fnord i thinking of getting a pipe the size of the burst disks and just put them in a hydraulic press and make like 1000 at 5seconds

That's not a bad idea actually.

its a price we all have to pay my friend (if you own a hybrid that is)

Not me. I'm above the law! Muahaha.
I just have to fix crap that breaks due to ridiculous mechanical stresses.

sthorne wrote:its a price we all have to pay my friend (if you own a hybrid that is)

Or a burst disk pnumatic

And spudfarm I actually really like that idea but I would use a vice instead and clamp it down as hard as I can.

i got a 10ton hydraulic press so clamping power = no problem

bigbob12345 wrote:

sthorne wrote:its a price we all have to pay my friend (if you own a hybrid that is)

Or a burst disk pnumatic

or that. and technically, wouldn't a "burst disk pneumatic" just be an advanced pneumatic?

Um, you use unrated abs at 500 psi

Well, make that 50 times the rated pressure... I'm pretty sure that I significantly exceed the burst pressure of the barrel pipes, it's amazing how long they've survived, even in subzero temperatures with heavy (and often completely jammed ) ammo.

and technically, wouldn't a "burst disk pneumatic" just be an advanced pneumatic?

No. When you're talking about a pneumatic, the valve is the defining component, and a lot of valves fall into the so-called "advanced" category, anything homemade really.

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DYI, 2" nominal diameter Sch 40 DWV ABS pipe should (assuming no molding defects) have a burst pressure of around 1000PSI, so I am not surprised that it resists <500PSI for only a few tens of milliseconds.

Well that's certainly good to know. I'd always assumed it was lower, with all the talk of it bursting at around 150 psi... I guess just another unbased assumption like the whole "mixes over 4x risk detonation" thing. What's the burst pressure of 4" SCH 40 ABS? I may not have to reinforce that barrel after all...

And I'm using DWV copper for the barrel on my hybrid, so no worries there (I hope).

no DYI i also use some really thin walled copper for my hybrid and it is fine
BTW with your hybrid are you thinking to go up to like 10x ?

The goal for my hybrid is 10x air/MAPP. After hydrostatic testing to 1500 psig, 10x will be the normal operating mix. Due to the nature of my meter, I don't expect that fueling will be incredibly accurate below 4x or so, and I see no real reason to use anything other than full power, except maybe for shooting in my yard.

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Thanks. I'll probably reinforce it anyway, because I don't want to risk accidentally bursting a $90 chunk of pipe.

whhhoa 10x
you should get to mach two

my goal for all of my cannons/hybrids is SOS.
a GB at the speed of sound should be interesting...