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Nasty mould after water ans sugar shots.

A place to ask general spud cannon related questions.
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Nasty mould after water ans sugar shots.

Unread postAuthor: microman171 » Fri May 15, 2009 1:21 am

Hey Guys,

Been a while since I was on here! Before I left I built the Bazookair cannon, the Bad Ass Kiwi Co-Axial.

I have fired all sorts of things from the barrel, including sugar. Being a pneumatic, it is easier to fire a larder range of things.

Sugar, water, and time = mould. I don't know what mould does to PVC. Does it make it more brittle?

And how about UV exposure? I know that makes it more brittle, but does it affect the pressure rating?

I'm not too keen on building another cannon for cost reasons, so would love to fix up this one. I will have learnt my lesson from the sugar xD.


Thanks,

Microman171
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Unread postAuthor: jackssmirkingrevenge » Fri May 15, 2009 1:33 am

Being organic, I doubt mould would have any effect on PVC. As to UV exposure, thay would tend to weaken the pipe.

microman171 wrote:Being a pneumatic, it is easier to fire a larder range of things.


Hah! invisible pun :D
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Unread postAuthor: microman171 » Fri May 15, 2009 6:30 am

Hah! Larder range... Oops.

So will this thing still be safe to use? It is class E and F (200+PSI).
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Unread postAuthor: jackssmirkingrevenge » Tue May 19, 2009 4:14 pm

It's hard to tell, depends on the level of exposure. I wouldn't trust it to high pressure.
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Unread postAuthor: microman171 » Wed May 20, 2009 12:22 am

Hmm, would I notice any discolouration? The pipe is still nice and white.
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Unread postAuthor: jackssmirkingrevenge » Wed May 20, 2009 1:48 am

It usually tends to go a bit yellow. Was it exposed to direct sunlight though?
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Unread postAuthor: microman171 » Wed May 20, 2009 3:42 pm

Not that I know of, more just sat in a garage in the light for a long time.
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Unread postAuthor: Biopyro » Wed May 20, 2009 4:00 pm

Was it outside in the sun or was the exposure through a window?
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Unread postAuthor: Brian the brain » Wed May 20, 2009 4:51 pm

I wouldn't worry about the mould.

Would people use PVC for wastewater if that were a problem?

sunlight is a problem.
Try to hydrotest it.
Fill 'er up with water all the way and then apply airpressure to it.
Water holds a lot less energy under pressure as it can't really be compressed, so when it fails it's no real problem safetywise.

Hydrotest it to it's rating and use it below...
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: microman171 » Wed May 20, 2009 7:18 pm

Thanks for the info guys =) The light was ambient, not direct. So I'm guessing the pipe will be perfectly fine. I will give it a good hydro test before using it though.

Good to hear about the mould thing. I wasn't sure if it would affect the pressure rating or not. Waste pipe doesn't need to hold pressure?
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Unread postAuthor: Brian the brain » Thu May 21, 2009 8:14 am

No it doesn't.

but it needs to ..well..function..for years without leaking..without it being " eaten" by mould..
If mould would damage it, we would never use it.
:wink:
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Gun Freak wrote:
Oh my friggin god stop being so awesome, that thing is pure kick ass. Most innovative and creative pneumatic that the files have ever come by!

Can't ask for a better compliment!!
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Unread postAuthor: microman171 » Fri May 22, 2009 12:56 am

Cool, glad to hear my gun should still be good =)
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