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Plumbing GOO safe?

A place to ask general spud cannon related questions.
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Unread postAuthor: Bubba05 » Fri Jun 01, 2007 2:00 am

Oh it's like a big bloody chemical reaction it's like the surfice melts and then when they join together there like one? AH i dono some one help me here whats the prosess so he can look it up on wiki?
Well any way it stops it from blowing apart in your hand. YES always use primer!!! Your safteys at stake mate!
You have to listen to the words of wisdom on this site mate or ya gunna loose a hand.

Bubba
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Unread postAuthor: flamerz14 » Fri Jun 01, 2007 4:55 am

I just saw this video on youtube...this guy makes a combustion WITHOUT priming yet it stays in 1 piece after shooting.he just puts the PVC cement
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Unread postAuthor: Insomniac » Fri Jun 01, 2007 5:11 am

It softens the surface so that the cement can 'melt' the plastic together. Without primer the cement won't be able to chemically melt the plastic effectively and it won't bond with a strong join.
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Unread postAuthor: flamerz14 » Fri Jun 01, 2007 5:15 am

So that means the cement "melts" the plastic togeher.The primer helps the cement stick to the fittings.But then again, the pipes and fittings are made for each other, and even using the cement by itself helps it to get tightened evn more.
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Unread postAuthor: Bubba05 » Fri Jun 01, 2007 8:50 am

Yeah now your getting the idear!!
PS yeah it will work and hold with just cement but it wont last that long after a few goes the heat build up stuff the cement and the bond comes loose! hence they blow apart! trust me dude you dont want that happening! IT REALY HURTS!!!

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Unread postAuthor: flamerz14 » Fri Jun 01, 2007 8:53 am

Blow apart or explode?anyways I don't want any of those o happen.. :roll: howw much does cement and primer cost altogether?
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Unread postAuthor: Bubba05 » Fri Jun 01, 2007 8:55 am

hummmm where you at in the world?
In Australia you can pick them up at bunnings in a twin pack for like 15 bucks ands its enough to build a few cannons! I've done like 6 and i got heaps left!!

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Unread postAuthor: flamerz14 » Fri Jun 01, 2007 8:57 am

I live in Singapore..kinda hard to find stuff here for spudguns...have to go ard the whole place trying to find parts.Btw I'm also a student..low on funds. and can I put hoe clamps on the joints so they won't blow(if I don't use primer)?
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Unread postAuthor: Bubba05 » Fri Jun 01, 2007 9:04 am

Clamps is not a good idear ok mate! hunt around and find the stuff you need got to a hardwear store they should have the stuff hey

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Unread postAuthor: SpudBlaster15 » Fri Jun 01, 2007 10:21 am

Dude, just spend the extra $5 and buy some primer. PVC does not dissolve very easily into the solvents present in the cement, so an aggressive application of primer is necessary to allow the polymers present in the cement and pipe/fittings to intertwine, forming a strong joint.

I suggest you read the solvent cementing guide stickied at the top of the forum.
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Unread postAuthor: iknowmy3tables » Fri Jun 01, 2007 11:30 am

yes yes joint probely wont explod if you don't prime them :roll: that doesn't make it safe, just buy it primer is cheap and it will several times longer then a can of pvc cement since it doesn't dryout as much.
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Unread postAuthor: flamerz14 » Fri Jun 01, 2007 8:36 pm

Alrighty, I'll do as you all say masters.Asied from cementing together, how do I know the difference between DWV and ppressure rated fittings?
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Unread postAuthor: SpudBlaster15 » Fri Jun 01, 2007 9:09 pm

Pressure rated fittings are usually marked with "NSF-pw", and have socket depths approximately equivalent to the pipe diameter. DWV fittings typically have much shorter sockets, and are not marked with NSF-pw.

When used for the construction of a combustion cannon, DWV fittings are acceptable.
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Unread postAuthor: flamerz14 » Fri Jun 01, 2007 9:11 pm

And why might that be? by the way IF I had accidently used DWV for a pneumatic, how much pressure can it take?
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Unread postAuthor: Bubba05 » Fri Jun 01, 2007 9:23 pm

I dono about pneumatic cannons but i dont think they could handle anything over 100 psi dont take this for gosple but i remember someone saying that some where!

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