SCH. 40 vs ABS
- mattyzip77
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If your going to spend the money on a b s, why not just spend a few bucks more on steel??? I have never used a b s on a spud gun, however I heard from multiple forum members that it is alot safer than p v c.
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- Technician1002
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Sched 40 is a size definition. ABS is a plastic material. PVC is a plastic material. Both ABS and PVC can be purchased in Sched 40 size. Steel can be purchased in Sched 40 size.
On to materials.. I have a thread on the subject. Search could have found it.
http://www.spudfiles.com/forums/pvc-is- ... 21334.html
In testing ABS..
http://www.spudfiles.com/forums/is-this ... 20954.html
http://www.spudfiles.com/forums/abs-cel ... 17968.html
http://www.spudfiles.com/forums/abs-can ... t8573.html
A photo of an ABS failure with a more than normal pressure.
DANGER.. Do not try this at home. Please do not use Oxygen in your cannons. Oxygen is what caused the above damage. Link for material failure mode only. ABS should be fine for normal metered propane.
http://www.sentex.net/~mwandel/cannon/my_cannon.html
On to materials.. I have a thread on the subject. Search could have found it.
http://www.spudfiles.com/forums/pvc-is- ... 21334.html
In testing ABS..
http://www.spudfiles.com/forums/is-this ... 20954.html
http://www.spudfiles.com/forums/abs-cel ... 17968.html
http://www.spudfiles.com/forums/abs-can ... t8573.html
A photo of an ABS failure with a more than normal pressure.
DANGER.. Do not try this at home. Please do not use Oxygen in your cannons. Oxygen is what caused the above damage. Link for material failure mode only. ABS should be fine for normal metered propane.
http://www.sentex.net/~mwandel/cannon/my_cannon.html
- MrCrowley
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Well we already have had loads of topics like this one (that poll people's opinions on the matter). If you can find pressure rated ABS, by all means use that instead of PVC. If you can find DWV ABS (non-cell core), it will be fine on a properly constructed combustion cannons. I would recommend pressure rated ABS or pressure rated PVC for pneumatics but ABS would be the better option.
As for an advanced combustion (propane or MAPP) DWV ABS probably can be used reasonably safely, just make sure to tap any fittings in to double layered areas (where a pipe meets a fitting, for example).
As for an advanced combustion (propane or MAPP) DWV ABS probably can be used reasonably safely, just make sure to tap any fittings in to double layered areas (where a pipe meets a fitting, for example).
- Crna Legija
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PVC will turn to shrapnel, abs just a single crack like above.
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- MrCrowley
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I've had some fittings on a PVC chamber fail at around 100PSI. With three people around it, no one was hurt but I owe that to the fact it was down by our waists and not close to our faces. It does indeed shrapnel.
With your proposed hybrid chamber, you would probably be better off just using the copper piping you planned to use as a sleeve and fibre glassing it.
With your proposed hybrid chamber, you would probably be better off just using the copper piping you planned to use as a sleeve and fibre glassing it.
- jackssmirkingrevenge
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This is science, opinions shouldn't matter - only cold hard factsMrCrowley wrote:Well we already have had loads of topics like this one (that poll people's opinions on the matter).
hectmarr wrote:You have to make many weapons, because this field is long and short life
- MrCrowley
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Well I say opinions because the facts aren't in question, it is how we choose to interpret them. This of course is aimed at the argument over whether we should use PVC or not due to its failure characteristics and manufacturer warnings about using it with pressurised air (which is essentially about failure characteristics). I think whether one should follow that warning or not is a matter of opinion.
If anyone has missed out on such an argument, it goes like this:
Person A: If your PVC chamber fails, it will shrapnel with potentially harmful consequences.
Person B: Well it's a good thing then that my chamber is rated for 260PSI and I only use it at 120PSI.
Person A: The same people who put a rating on that pipe also state that it shouldn't be used with pressurised air.
Person B: Well that's because of the failure characteristics, not because air is harmful to the structural properties of the pipe.
Rinse and repeat.
If anyone has missed out on such an argument, it goes like this:
Person A: If your PVC chamber fails, it will shrapnel with potentially harmful consequences.
Person B: Well it's a good thing then that my chamber is rated for 260PSI and I only use it at 120PSI.
Person A: The same people who put a rating on that pipe also state that it shouldn't be used with pressurised air.
Person B: Well that's because of the failure characteristics, not because air is harmful to the structural properties of the pipe.
Rinse and repeat.
- jackssmirkingrevenge
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Fair enough, the question is do we have enough data to make an informed choice? Massive subtle hint wink wink nudge nudgeMrCrowley wrote:I think whether one should follow that warning or not is a matter of opinion.
hectmarr wrote:You have to make many weapons, because this field is long and short life
i'm not sure if this was directed at me, but i'll reply, i was actually thinking of making an all copper chamber, then i remembered that i don't have any 3" copper fittings, and 3" copper fittings are expensive... this (http://www.spudfiles.com/forums/new-hyb ... 24270.html) was meant to be as cheap as possible... but back the the topic on hand. I know what how the pvc is supposed to fail, but i've never seen pictures of a chamber failure. Curiosity led me to wonder the shrapnel size, power, and spread pattern in the case of a full chamber pvc failure.MrCrowley wrote:With your proposed hybrid chamber, you would probably be better off just using the copper piping you planned to use as a sleeve and fibre glassing it.