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PVC in cold

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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PVC in cold

Unread postAuthor: maxfreke88 » Sat Jan 12, 2008 6:06 pm

I left my air cannon in 30F weather for 1 day, i heard that this makes pvc brittle will it thaw out to it original state or trash it :cry: ? i usually fill it to ~80psi is it safe to fill it to that and, when (if it thaws) do i fill it??

THANK YOU
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Unread postAuthor: MaxuS » Sat Jan 12, 2008 6:11 pm

It should be fine if you warm it slowly for quite a while.
Although I'm unsure about the long lasting effects of cold weather on PVC, isn't 30F way below freezing?
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Unread postAuthor: Eddbot » Sat Jan 12, 2008 6:14 pm

only 2 degrees below freezing, i think if you let it come to room temperature slowly it will be fine, just don't shoot it when it's still cold, and if you must shoot in the winter, pump it up inside, then go outside to shoot, then go back inside to pump again
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Unread postAuthor: daberno123 » Sat Jan 12, 2008 6:14 pm

30F is 2 degrees below freezing point. Just wait about a day for it to waarm up by keeping it inside your house, which is hopefully warmer than 30F
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Unread postAuthor: maxfreke88 » Sat Jan 12, 2008 6:16 pm

thanks for the fast response!! :D Actually it is about freezing temp or -1C
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Unread postAuthor: maxfreke88 » Sat Jan 12, 2008 6:22 pm

is 80 psi a good pressure for tommorow
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Unread postAuthor: MaxuS » Sat Jan 12, 2008 6:27 pm

As long as it's had a good warm up.

I have no idea about Farenheit, I'm a Celcius man.
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Unread postAuthor: paaiyan » Sat Jan 12, 2008 7:01 pm

To convert from Fahrenheit to Celsius you subtract 32 then multiply by 5/9. From Celsius to Fahrenheit you multiply by 9/5 then add 32. The PVC should be fine like everyone else says.
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Unread postAuthor: sjog » Sat Jan 12, 2008 7:01 pm

Do not drop it when cold.
I dropped one from 7' at 45 f. on concrete and two fittings shattered, I mean tiny pieces.
I was amazed, thought PVC was tougher than that.
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Unread postAuthor: daberno123 » Sat Jan 12, 2008 7:14 pm

below 50F pvc loses it properties of storing gases
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Unread postAuthor: maxfreke88 » Sat Jan 12, 2008 8:07 pm

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Unread postAuthor: LikimysCrotchus5 » Sat Jan 12, 2008 8:21 pm

Yes it is possible but your are going to have to see if it has a guide rod or a flow control (which you want to take out).

Also you are going to have to fill that hole with epoxy, (next to the solenoid, has a screw cap on it i think)
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Unread postAuthor: maxfreke88 » Sat Jan 12, 2008 8:32 pm

LikimysCrotchus5 wrote:Yes it is possible but your are going to have to see if it has a guide rod or a flow control (which you want to take out).

Also you are going to have to fill that hole with epoxy, (next to the solenoid, has a screw cap on it i think)


what does taking the guide rod out achieve? Just wondering im a noob to pneumatics
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Unread postAuthor: LikimysCrotchus5 » Sat Jan 12, 2008 8:49 pm

Better flow
(Too short)
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Unread postAuthor: SpudBlaster15 » Sat Jan 12, 2008 10:52 pm

The effects of minor temperature changes on PVC pipe are "temporary", meaning that provided you don't heat the pipe sufficiently to melt it, no permanent alterations in the structure of the pipe will occur.

The strength of thermoplastics actually increases with decreasing temperature. Unfortunately, their impact strength decreases. Some would argue that the launcher would be fine so long as it was not dropped, but I believe the rapid pressure spike within the barrel caused by the valve opening subjects the pipe to considerable impact.
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