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Pvc pipe safety query

Post questions and info about combustion (flammable vapor) powered cannons here. This includes discussion about fuels, ratios, ignition systems, safety, and anything else relevant.
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Pvc pipe safety query

Unread postAuthor: inonickname » Fri Feb 13, 2009 8:14 pm

Image

Image

Image

And the pvc surplus:
Image

48mm O.D.
1.6mm wall thickness
45mm ID

I looked through the spudwiki, and wasn't able to identify it. It's definitely PVC. The section I have has no markings on it for some reason.. Just thought I'd ask if you reckon it's safe before use.

It'll be in a 1x combustion, metered butane. Chamber fan, sparkstrip etc.


Please tell me if you think it's safe/unsafe/unsure/plastic deathtrap. Input appreciated! :P

P.S. If it goes ahead, it's an upsize of this project. I'll be making the fan etc, and I've found a nice stainless steel barrel if it goes ahead.

Thanks guys
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Unread postAuthor: SpudsMcGee » Fri Feb 13, 2009 8:25 pm

Its your call, it might or might not be safe if it doesn't have markings. I personally wouldn't do it if I was unsure.
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Unread postAuthor: potatoflinger » Fri Feb 13, 2009 8:57 pm

That pipe looks pretty thin if you ask me... I think you should spend the money on pipe that you are certain is pressure rated, it's money well spent.
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Unread postAuthor: inonickname » Fri Feb 13, 2009 9:04 pm

That's what I was thinking...I'll leave it. If i decide to come back to the same pipe I'll just hydrotest it at 120 psi in my blast cage (3 layers of 1cm thick perspex)
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Unread postAuthor: MrCrowley » Fri Feb 13, 2009 9:14 pm

Looks like standard DWV to me, funny about no markings though. It doesn't look like spouting though (which is super thin with no markings).

It's probably fine for a combustion hairspray cannon, but I wouldn't go much above that.
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Unread postAuthor: inonickname » Fri Feb 13, 2009 9:18 pm

MrCrowley wrote:Looks like standard DWV to me, funny about no markings though. It doesn't look like spouting though (which is super thin with no markings).

It's probably fine for a combustion hairspray cannon, but I wouldn't go much above that.


Thanks. I'll have a look and see if I have any pipe around to sleeve it with.. Theres a fair step from hairspray to metering.
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Unread postAuthor: Radiation » Sat Feb 14, 2009 12:19 am

If it's not marked it's not worth the risk. That stuff looks really thin. I have never seen pressure rated tubing that was not marked. On the other hand I have seen non-pressure rated stuff that isn't mark. So odds are against you. Is it worth the gamble? Pressure rated PVC is so damn cheap.
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Unread postAuthor: starman » Sat Feb 14, 2009 2:03 am

Those diminsions are almost idential to SDR21 1.5"...ever so slightly larger ID. Still looks a little thinnish. It may be some of that "SD" drain pipe material....you should stay away from that.

Are you in Europe nickname?
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Last edited by starman on Mon Mar 02, 2009 11:15 pm, edited 1 time in total.
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Unread postAuthor: inonickname » Sat Feb 14, 2009 4:00 am

Radiation wrote:If it's not marked it's not worth the risk. That stuff looks really thin. I have never seen pressure rated tubing that was not marked. On the other hand I have seen non-pressure rated stuff that isn't mark. So odds are against you. Is it worth the gamble? Pressure rated PVC is so damn cheap.


Aint gonna bother with it. And PW cheap here? a 1/2" endcap is $3...
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Unread postAuthor: littlebro05 » Sat Feb 14, 2009 6:27 am

Just do it the mythbusters way... have a super long spark plug with a blast shield. That would be awesome. Then again 1.5mm does sound like DWV.
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Unread postAuthor: inonickname » Sat Feb 14, 2009 6:52 am

It's off the table. Just managed to use some as a burst disk....And also it cuts differently to pw, it melts and gets stuck in hacksaw teeth... 3 Cuts basically wrecks the blade, and you have to use a stanley or a flame to get rid of it.
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Unread postAuthor: sgort87 » Mon Mar 02, 2009 9:45 pm

That, my friend, is 1.5" SDR 26 pipe, rated for 160 psi. You're all good, man.

This pipe is almost perfect for golf balls. SDR 21 is a closer fit, but this will work too.

I would stick to just using it as a barrel, or possibly the chamber of a combustion. Stay away from using it for a pneumatic chamber or a giant meter pipe. If you were to hit this while pressurized, it could be bad.
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