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bike pump pressure

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bike pump pressure

Unread postAuthor: cardinals08 » Tue Jan 10, 2006 7:04 pm

How much pressure could you get in a copper chamber of say, 1 inch by 4 inches with a portable bike or ball pump, the cheap ones, like from wal mart? It doesnt seem like you could get much because it would get hard to pump.
Also, my friend is making a small pnuematic out of PVC and wants to know if you could just drill a hole in the side and glue the filling valve (from a bicycle innertube) in it. I told him it probably would just shoot out before he got good pressure, am I right?
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Unread postAuthor: sergeantspud2 » Tue Jan 10, 2006 9:02 pm

i got to 90 psi on a standard bike pump with a 1" by 12" piece of galvanised pipe
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Unread postAuthor: cardinals08 » Tue Jan 10, 2006 9:22 pm

It wouldnt make it any harder to pump with a bigger or smaller chamber, would it? all that matters is the pressure thats inside already, right?
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Unread postAuthor: deathtodeer666 » Wed Jan 11, 2006 1:18 am

I get 125 psi with a $10 plastic one from a bike shop,after that preasure it leaks out the hose
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Unread postAuthor: darkpyro » Wed Jan 11, 2006 5:55 am

i used a tire valve out of a tire inner tube and it works fine you just have to leave some of thed rubber from the inner tube around the valve and then you drill your hole in the end cap or where ever and put lots of glue on the rubber that is left and all around the tire valve and then stick it through the valve and it should work fine.
hope you understand :D
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Unread postAuthor: cardinals08 » Wed Jan 11, 2006 8:04 am

ya, Ill let him know he should put it in the end cap, thanks
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Unread postAuthor: jrrdw » Wed Jan 11, 2006 1:01 pm

there should be a preasure rateing written on the side of the pipe, most pipes are greatly under rated, but dont push your luck to far, think safty, wear eye protection and welders apron to catch any metal fragments in case of bursting, or better yet put a piece of thick plywood between you and the cannon while chargeing, pumping up. dont count on the preasure guages being accurate, they are never rite on the money!

p.s. all opinuns given are from personal experances

p.s.s. murphys law allways applies quote- WHAT CAN GO WRONG WILL GO WRONG AT THE WRONG TIME, i think thats how it goes :!:
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Unread postAuthor: drac » Wed Jan 11, 2006 9:33 pm

Copper pipe will not burst from pressures in the range of 100 PSI. Copper is rated up to 440 PSI, and I can't even get past 150 with a bike pump, and believe me when I say that I consider myself pretty strong.

It's not going to burst.
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Unread postAuthor: cardinals08 » Thu Jan 12, 2006 9:12 am

I didnt think I could get enough for it to burst, I was just asking if it was easy to get up to pressure with a bike pump, I wouldnt go past 110 psi, but I would start slow to make sure it would hold up
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Unread postAuthor: drac » Thu Jan 12, 2006 6:19 pm

Sorry, I was referring to jrrwd with my above post.
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Unread postAuthor: cardinals08 » Thu Jan 12, 2006 6:29 pm

thats fine, I was kinda talking to both of ya
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