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| SpudBlaster15 |
 Posted: 06/04/2007 21:19 PM Post subject: ABS cannon explosion |
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Hybridian
Joined: 18 Oct 2006
Posts: 2372
295.89 Spud Bux
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Throughout my time here, I have praised ABS as a cannon construction material. However, today, I advise anyone who has built a DWV ABS cannon of any kind to throw it away now, because there is a good chance this will happen to you after some time.
I was out firing my advanced combustion, and upon pressing the igniter for the first time, the end cap exploded, and a blast of hot air burned all of the hair off my left arm. I looked down, and a large crack had formed along the length of the chamber. Upon closer examination, 2 additional large cracks had formed in the 4" female adapter.
Pictures:
Last edited by SpudBlaster15 on 06/04/2007 21:30 PM; edited 1 time in total |
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| th3p0p0 |
| Posted: 06/04/2007 21:23 PM Post subject: |
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Sergeant Major
Joined: 31 Oct 2006
Posts: 194
268.54 Spud Bux
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but your ok other than sum burns rite? and don't give up just use pvc next time ok  |
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| mopherman |
| Posted: 06/04/2007 21:25 PM Post subject: |
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Brigadier General
Joined: 03 Feb 2007
Posts: 796
847.70 Spud Bux
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| Was there any shrapenal, or did it just split as most think it does? |
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| SpudBlaster15 |
| Posted: 06/04/2007 21:27 PM Post subject: |
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Hybridian
Joined: 18 Oct 2006
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295.89 Spud Bux
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I am glad I wasn't holding PVC in my hands when this happened, because I would be in the ER having shrapnel removed from my flesh.
I don't plan to give up, but I am not sure exactly what I am going to do now. |
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| ammosmoke |
| Posted: 06/04/2007 21:30 PM Post subject: |
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Brigadier General
Joined: 27 Sep 2006
Posts: 1020
1881.25 Spud Bux
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| Erm, yeah, so doesn't that mean it was a flaw in design or contruction and not the material? I would continue to use ABS if I were you. (At least as long as they do that, lol) ER doesn't sound like fun, and neither does death. |
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| MrCrowley |
| Posted: 06/04/2007 21:47 PM Post subject: |
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Kaleun
Joined: 23 Jun 2006
Posts: 8978
9125.29 Spud Bux
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| SpudBlaster15 wrote: | I am glad I wasn't holding PVC in my hands when this happened, because I would be in the ER having shrapnel removed from my flesh.
I don't plan to give up, but I am not sure exactly what I am going to do now. |
Thats true and false. What type of PVC? Pressure rated PVC you will be fine..DWV/Down pipe is another story. And then who's to say PVC DWV has a higher chance of exploding? It may shrapnel but its got to explode first.
Just make sure your more specific next time before another heated discussion begins. |
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| benstern |
| Posted: 06/04/2007 21:58 PM Post subject: |
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Donating Member
Joined: 21 Sep 2005
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| SpudBlaster15 wrote: | | I am glad I wasn't holding PVC in my hands when this happened, because I would be in the ER having shrapnel removed from my flesh. |
Actually if it was made out of pvc this would not have been an issue as pvc is stronger. |
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| SpudBlaster15 |
| Posted: 06/04/2007 22:02 PM Post subject: |
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Hybridian
Joined: 18 Oct 2006
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| No, I believe the components were defective. Should I have been holding a defective PVC component in my hands, I would be in the ER. |
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| ammosmoke |
| Posted: 06/04/2007 22:05 PM Post subject: |
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Brigadier General
Joined: 27 Sep 2006
Posts: 1020
1881.25 Spud Bux
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| Ah, that makes much more sense! |
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| noname |
| Posted: 06/04/2007 22:45 PM Post subject: |
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Mr Vortex
Joined: 10 Apr 2006
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I'm glad this happened, as a matter of fact! Thank you for saving me tons of hassle if a cannon I sold to someone exploded like yours! I'm not especially happy your gun blew (it was pretty cool), but I'm glad I know about it now.
Alright everybody, I'm not trying to sound like a dick/jerk/combination of random bad things to be, but have I not stated that DWV ABS is not as good an option as PVC?
SpudBlaster, I know you think it was defective compnents that failed, but the pipe itself also cracked. |
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| SpudBlaster15 |
| Posted: 06/04/2007 23:02 PM Post subject: |
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Hybridian
Joined: 18 Oct 2006
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It seems strange that the pipe and fittings both failed on the same shot. Possibly defective, but I really don't know.
I was growing tired of firing this launcher, so I may remove the propane meter and use it on a small marble firing hybrid I have been planning to build. |
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| hi |
| Posted: 06/04/2007 23:47 PM Post subject: |
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Major General
Joined: 01 Feb 2007
Posts: 1632
1425.41 Spud Bux
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| dont build it out of abs for obvious reasons. |
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| SpudBlaster15 |
| Posted: 06/05/2007 1:04 AM Post subject: |
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Hybridian
Joined: 18 Oct 2006
Posts: 2372
295.89 Spud Bux
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A 4x hybrid made of unrated ABS, hmmm, I would tend to agree with you there.
My intention was to use Sch 40 steel for the hybrid's chamber. |
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| TurboSuper |
| Posted: 06/05/2007 6:48 AM Post subject: |
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Brigadier General
Joined: 16 Jun 2005
Posts: 984
1709.46 Spud Bux
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| Meh, DWV pipe isn't rated for pressure, ergo there is always a chance of it failing no matter what. The odds with ABS are prety good though, you just got unlucky. |
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| BC Pneumatics |
| Posted: 06/05/2007 7:19 AM Post subject: Re: ABS cannon explosion |
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Donating Member
Joined: 18 Jan 2005
Posts: 1231
2466.53 Spud Bux
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| SpudBlaster15 wrote: | | Throughout my time here, I have praised ABS as a cannon construction material. However, today, I advise anyone who has built a DWV ABS cannon of any kind to throw it away now, because there is a good chance this will happen to you after some time. |
I don't think you can say there is anywhere near "a good chance this will happen to you" after one outlying incident.
That is the type of statement that can only be made from lots of testing/data collection. |
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