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ft. lbs. to PSI

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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ft. lbs. to PSI

Unread postAuthor: jitup » Tue Dec 09, 2008 9:08 pm

Ok I need to figure out how many psi 50 ft lbs is
acording to google
ft lbs * 12^2 = psi
so
ft lbs * 144 =psi
50 ft lbs *144= 7200 psi
Is this correct, it is the rating on a QEV?
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Unread postAuthor: FishBoy » Tue Dec 09, 2008 9:09 pm

this is what I always use- http://www.digitaldutch.com/unitconverter/

I don't know what a QEV's rating is.
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Unread postAuthor: jitup » Tue Dec 09, 2008 9:13 pm

I am sorry let me clarify. They claim the ration is 50 ft lbs.
I was wondering if my calculations are correct and if the conversion factor is right.
the link dose not have ft lbs to psi
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Unread postAuthor: Hotwired » Tue Dec 09, 2008 9:39 pm

What the holy hell monkey of doom does 50 foot pounds of force have to do with a QEV pressure rating?

It's comparable to saying it has a rating of 67.79 joules... ???

Is this on a website or somewhere interweb visible?

The closest likely symbol is lbf/in2 which is itself just psi.
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Unread postAuthor: jitup » Tue Dec 09, 2008 10:00 pm

no, I found a QEV used in the newspaper and the guy said it had a 50 ft lb rateing and I also thought it was strange. this is what the guy told me.
it has a 3/4 in inilet an out let
the pressure rating is 50 ft. lbs.

he could be mistaken, but I found it unlikely that the QEV only had a rating of 50 psi, yet I doubt it can handle 7200 psi. If any body could help be explaining this to me I would much appreaciate it.
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Unread postAuthor: Gippeto » Tue Dec 09, 2008 11:21 pm

Get a make and model number. Do a google search on it.
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Unread postAuthor: SpudBlaster15 » Wed Dec 10, 2008 1:18 am

Foot pounds is a measure of torque, which is twisting force. You cannot convert it to pressure. You can however, determine the applied force, and if an area measurement is given, the applied pressure as well. I fail to see how a torque measurement could apply to a QEV though. As Gippeto said, ask the seller to give you a brand name and model number.
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Unread postAuthor: MrCrowley » Wed Dec 10, 2008 1:23 am

50 ft lb

Maybe he mixed it up with pounds per square inch? And instead thought of pounds per square...foot :lol:
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Unread postAuthor: SpudBlaster15 » Wed Dec 10, 2008 1:53 am

I wouldn't think that a QEV would be rated that low, but it's possible...
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Unread postAuthor: MrCrowley » Wed Dec 10, 2008 2:11 am

Coupled with my previous theory, maybe there was a misprint and he also meant 150? :roll: :)
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Unread postAuthor: psycix » Wed Dec 10, 2008 7:29 am

or he meant 50 bar.
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Unread postAuthor: D_Hall » Wed Dec 10, 2008 9:33 am

psycix wrote:or he meant 50 bar.


And hey, how do you apply torque? With a cheater bar!
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