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Cheap compressor solution

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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Re: Cheap compressor solution

Unread postAuthor: vng21092 » Sun Jan 25, 2015 12:25 pm

Considering that 1/2'' PVC is rated ~750 PSI, is it safe to build a stirrup pump out of that? Because, I found a couple of threads for stirrups and it seems most require welding, which I don't have tools/knowledge of.
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Re: Cheap compressor solution

Unread postAuthor: Gippeto » Sun Jan 25, 2015 1:39 pm

Compressing air generates heat as a byproduct...heat is not so friendly to plastic. I will not suggest that you use pvc.

Would suggest you invest in a propane torch kit...check with harbour freight.

Youtube will have some tutorials on sweating copper. (soldering copper)
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Re: Cheap compressor solution

Unread postAuthor: Doodmens » Mon May 25, 2015 4:49 pm

When you go higher than the 'maximum' pressure of a fridge compressor, does it just stop or will it break?
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Re: Cheap compressor solution

Unread postAuthor: mrfoo » Tue May 26, 2015 1:10 am

As you build up pressure on the output side, you eventually get to the point where your compressor can't compress the air on its output side any more. It will keep trying, but it won't generate any more pressure - you can't go higher than its maximum pressure*.

The compressor itself won't stop when it gets to its maximum, it will keep on trying, and as a result it will generate more and more heat; this will eventually (rapidly) cause the thermal cutoff to kick in and stop the compressor, hopefully before it burns itself out.

* in fact, it's not a hard pressure limit, rather a differential in pressure between input and output side.
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Re: Cheap compressor solution

Unread postAuthor: Gun Freak » Fri May 29, 2015 11:53 pm

I have maxed my fridgy out twice I think, and it simply stalled. It will not start again until the pressure on the output side is relieved. It still runs fine to this day. Perhaps some compressors behave differently under too high of pressure. Maybe mine survived because it reached such high pressure so quickly. A very small volume was compressed to over 500 psi in about one second before it pooped out.
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