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Attaching PVC to a soda bottle?

Post questions and info about pneumatic (compressed gas) powered cannons here. This includes discussion about valves, pipe types, compressors, alternate gas setups, and anything else relevant.
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Attaching PVC to a soda bottle?

Unread postAuthor: KurlyQ » Sun Mar 30, 2008 10:24 pm

I have already built one air cannon, but it is rather bulky, hard to transport, and the air reservoir takes waaaayyy too long to fill.

For my Second air cannon, I decided to use a two liter soda bottle for an air reservoir. I found that a half inch PVC pipe fit nicely in the neck of the bottle, but then I ran into a problem...How am I going to glue the PVC pipe to the bottle? I used PVC cement at first (lots of it) and that seemed to work. On my first test, the joint leaked :( . I decided to put a little epoxy around the rim, to make it airtight. that seemed to work.

Now the big question...Is the two liter bottle going to blow off in my face when I pressurize? :shock:

I will probably never fill my cannon over 70 psi, and sitck closer to 50 psi most of the time.

What glue should I use to secure the PET plastic of the bottle to PVC?

Here's what my first attempt looks like.
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Unread postAuthor: Davidvaini » Sun Mar 30, 2008 10:32 pm

The plastic used in soda bottles are very similar in chemical compound to PVC.. with that said PVC cement might work but it might not... a 2 part general plastic epoxy should be strong enough for the kinda pressures you will be using it for.
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Unread postAuthor: blind909 » Sun Mar 30, 2008 10:41 pm

my suggestion would be some plumbing epoxy putty, i use it on everything now, it only cost 3.98 for a 5 inch long 1 inch thick stick.
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Unread postAuthor: Killjoy » Sun Mar 30, 2008 10:47 pm

I've used super glue and epoxy to attach soda bottles to half inch pvc and both work good, and I've tested the joints (over 100 in total, we use this setup with cannons for a kids camp) to 125 psi with no failures.
And you just have to glue to like you would a normal pvc fitting.
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Unread postAuthor: OuchProgramme » Sun Mar 30, 2008 11:43 pm

I've used the smaller bottles, and have bonded the 1/2 inch piping with the coke bottle with 5 min epoxy. Holds really well
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Unread postAuthor: jook13 » Mon Mar 31, 2008 12:01 am

I concur. epoxy holds really well for this.
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Unread postAuthor: jimmy101 » Mon Mar 31, 2008 10:20 am

You can buy an adaptor for the typical soda bottle thread from Spudcom.com, Two-Liter Pop Manifold [P-500]
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Unread postAuthor: Maniac » Mon Mar 31, 2008 12:49 pm

The best thing to do is sand down the threads on the bottle and then epoxy it into the ball valve.
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