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Pressure rating of several components

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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Pressure rating of several components

Unread postAuthor: Gramanam » Sun Feb 08, 2009 10:20 pm

Okay, after destroying several pvc spudguns (the plastic just couldn't hold up to my awesomeness), I have decided to build a high pressure metal spudgun.

Most parts on McMaster-Carr, are labeled with the pressure rating but several aren't.

1. Can Sch 80 Seamless Steel pipe handle 3000 psi like all of the other Seamless parts?

2. I have This QEV, what pressures should I be safe taking it up to?

3. What pressure can a standard blowgun be used up to? What would be a suitable high-pressure replacement?
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Unread postAuthor: trigun » Sun Feb 08, 2009 10:42 pm

1. what size pipe are you using

2. I'm guessing just a guess 200 psi. Don't trust me on that one.

3. Blowguns have been used upwards of 600 psi. :D Other wise you will have to get a small ball valve.
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Unread postAuthor: Gramanam » Sun Feb 08, 2009 10:51 pm

Sorry, I am using 3/4 inch pipe
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Unread postAuthor: MrCrowley » Sun Feb 08, 2009 11:03 pm

People have taken those QEV's past 700PSI, just as a one-off though. I would keep to about 500PSI and under. I use mine at 350PSI all the time.
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Unread postAuthor: daxspudder » Sun Feb 08, 2009 11:03 pm

1) @3/4" it should but if I later find out you proved me wrong, ill personally submit your name for a darwin award
2)if you read the statment regarding (f) type valves (the kind you want) it clearly says maximum rating: 125psi
3) most are safety rated at 90-350psi... standard for 3 stage or less shop compressors...but have been used much higher... 3000 might be pushing it...
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Unread postAuthor: Gramanam » Sun Feb 08, 2009 11:12 pm

Well, I'm not going up to 3000 psi, its just that all the other seamless steel components (elbows, etc.) are rated to that pressure. The normal steel parts are rated to 150, and this is not sufficient.

@daxspudder
I am limited by the QEV, which I know can go higher than 125 psi. (see post above yours)

I am shooting for 300 psi or so, I just want to make sure I don't blow my self up.

Thanks for the replies so far!
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Last edited by Gramanam on Mon Feb 09, 2009 5:38 pm, edited 1 time in total.

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Unread postAuthor: Gippeto » Sun Feb 08, 2009 11:37 pm

@ Gramanam;

Have a read through this.

http://www.spudfiles.com/forums/the-fai ... 15393.html

Should ease your mind somewhat. :)

On my copper gun and my "bb" gun, I use a blowgun to 400psi.
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Unread postAuthor: maggotman » Mon Feb 09, 2009 1:24 pm

i use my copper gun and blow gun at 700 psi no problem dont recoment that pressure tho :P
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Unread postAuthor: Gramanam » Mon Feb 09, 2009 4:20 pm

Okay, I wasn't too worried about the blowgun. My main concern was with the QEV.

Does anyone know of a good pump (besides a shock pump) that will go up to 350-500 psi?
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Unread postAuthor: ramses » Mon Feb 09, 2009 4:32 pm

fridge compressor?
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