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hybrid EXPLOSION!
Posted: Mon Oct 01, 2007 5:01 pm
by thespeedycicada
well here is the story.After conducting at least ten 3x in my hybrid at least seven times i was totally sure it was safe at 2x and it propbaly was.Anyhow i was walking to where i was going to test fire it and i dropped it but i didn't think sch 40 would crack only pumped at 2x but i still inspected it to be sure nothing visible so i fired it...
Posted: Mon Oct 01, 2007 5:10 pm
by goose_man
Damn, good thing your not hurt. That would look bad for the hobby...
-goose_man
Posted: Mon Oct 01, 2007 5:23 pm
by thespeedycicada
welll i found more shards in the bushes...
Posted: Mon Oct 01, 2007 5:31 pm
by BigJon
you said that it was made out of sch40 right? Would that be PVC.
if so then that is most likely your problem because i don't think it could hold those kinds of pressures.
Posted: Mon Oct 01, 2007 5:43 pm
by f.c
i bet you shat yourself when it happened. maybe it means its time to upgrade to metal ?
Posted: Mon Oct 01, 2007 6:09 pm
by pyromaniac
BigJon wrote:you said that it was made out of sch40 right? Would that be PVC.
Sch 40 is a wall thickness, it doesn't mean it's pvc. It could be abs, steel(i highly doubt it), pvc, or some other type of pipe.
Posted: Mon Oct 01, 2007 6:16 pm
by MrCrowley
I think he knew that, we was asking 'would that be PVC?', as he may of known it could be steel, abs etc
Posted: Mon Oct 01, 2007 6:36 pm
by Hotwired
Well theres an incentive to not skimp on hybrid materials
Theres quite a few pics of PVC shattering under shock loads now and a hybrid mix is fairly well up there with shock loading.
Posted: Mon Oct 01, 2007 6:45 pm
by thespeedycicada
woot i found the barrel in the woods quite a distance away
Posted: Mon Oct 01, 2007 7:54 pm
by beebs111
what pressure were your burst discs set to burst at? just curious because a tiny crack plus a burt disk that could hold back too much presure could equal a boom.
Posted: Mon Oct 01, 2007 8:20 pm
by thespeedycicada
they usually blew at 175-180 psi.Which should be fine right?
Posted: Mon Oct 01, 2007 9:13 pm
by Novacastrian
I use a 70psi burst disc in my Hybrid- Maybe i should use two layers?
You are one lucky guy speedy.
Posted: Mon Oct 01, 2007 11:56 pm
by hi
it seems like everyone's hybrid that is made of pvc either quits working or blows up at one point or another...
maybe people shouldnt make them out of pvc, even if they are sch80.
just a thought
Posted: Tue Oct 02, 2007 12:05 am
by noname
The only PVC hybrid I use is made of a 1.5" coupler and two bushings. The whole thing is at least double layered Sch 40 and Sch 80, and the highest I EVER use it at is a 1.5x fuel mixture.
Apparently you missed my topic on PVC hybrid explosions.
Posted: Tue Oct 02, 2007 5:32 am
by mark.f
Hey now wait just a second. There are plenty of hybrids made out of PVC that haven't exploded yet. I have one working one and one "in progress", (although I quit building on it when I ran out of money), one in my closet.
And speedycicada, those white PVC fragments look awfully thin.