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The fail pressure of a Schrader valve?

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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Unread postAuthor: DYI » Sat Jul 26, 2008 12:55 pm

Great job Gippeto! :salute:

Now could you please test some galvanised/black steel pipe? We've been needing this information for a long time.
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Unread postAuthor: SpudFarm » Sat Jul 26, 2008 1:14 pm

i love it!

mabe we have under estimated the strength of pipes and fittings? :?
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Unread postAuthor: POLAND_SPUD » Sat Jul 26, 2008 2:19 pm

@thx gippetto, I own you a bottle of real polish vodka :)

the results are indeed very surprising.... of course the fact that the T failed first makes sense but I would never expect that it could withstand more than ~6000 psi :shock:



I hope that people won't start building 40X hybrids out of them... :?
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Unread postAuthor: Gippeto » Sat Jul 26, 2008 11:47 pm

@ DYI, ... I guess I can test a couple chunks of pipe too. Round things out so to speak. It'll be Monday @ the earliest.

Edit: Or is this maybe what you're looking for? :wink:

http://www.engineeringtoolbox.com/wroug ... _1123.html

@ Spudfarm, ... As mentioned, the results are only valid for the fittings which were tested. You use your fittings at your own discretion (and risk!)

@ Poland Spud, ... Just hoist a couple for me and we'll call it square! :)


Anyway, I said I was going to upload some pictures, so without further ado...


Edit: Had to resize pictures. (slaps forehead). They should be "up" now.
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Unread postAuthor: Coodude26 » Sun Jul 27, 2008 9:05 pm

Pardon my asking, but you lable those as "fractured tee"... is the fracture visible in those pictures or is that before testing?

Also you may want to put the pieces you are testing in sand. It stops bullets :)
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Unread postAuthor: Gippeto » Sun Jul 27, 2008 11:11 pm

Yes the cracks are visible.

On the first tee, the crack is between the two "lines of writing".

On the second tee you can see it leaking oil from the mold separation line. This is where it cracked.

The damage is limited because of the chosen testing method.

But rest assured, those fittings failed.
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Unread postAuthor: frankrede » Mon Jul 28, 2008 12:43 am

Gippeto wrote:Yes the cracks are visible.

On the first tee, the crack is between the two "lines of writing".

On the second tee you can see it leaking oil from the mold separation line. This is where it cracked.

The damage is limited because of the chosen testing method.

But rest assured, those fittings failed.
I'm sorry if I missed it, but at what pressure did those fail?
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Unread postAuthor: SpudFarm » Mon Jul 28, 2008 12:52 am

last post on page one frank
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Unread postAuthor: Gippeto » Tue Jul 29, 2008 6:58 pm

I have finished testing 1/2" pipe. Galvanized and black with end caps.

I used the same procedure and pressures outlined for the fittings.

Both types of pipe, and their respective end caps withstood 70000kpa.

As a side note, I would like to add that ALL fittings and pipe that were tested, have been discarded to avoid any potential mishaps.
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Unread postAuthor: Mr.Sandman » Tue Jul 29, 2008 7:03 pm

i just got a shock pump and pumped up this 3/4 by 5 inch long galvanized steel pipe to 700 psi (yes that is correct, took me about 20 minutes though) and the schrader still didnt blow up. so from my experience i dont think they will blow under a normal pneumatic cannon pressure
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Unread postAuthor: Gippeto » Tue Jul 29, 2008 7:11 pm

Mr. Sandman,

Did you bother to read this thread?

300 Bar = 4350.97897psi




Edited for grammar
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Last edited by Gippeto on Tue Jul 29, 2008 7:42 pm, edited 1 time in total.
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Unread postAuthor: Mr.Sandman » Tue Jul 29, 2008 7:12 pm

ohhhh ny bad i kinda have a bad habit of doing that :oops:
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Unread postAuthor: far_cry » Sat Sep 13, 2008 7:27 pm

oh Gippeto thats topic give me all the answers i need

so instead of 1/2" pipe a 3/4" pipe will handle 60%-70% of this pressure that 1/2" pipe can handle ??
you r amazing :P
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Unread postAuthor: rp181 » Sat Sep 13, 2008 9:54 pm

how do you do these tests? its sounds like your just putting weights on the top of the pipe. Do the weights push a cylinder down?
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Unread postAuthor: far_cry » Sat Sep 13, 2008 10:44 pm

rp181 wrote:how do you do these tests? its sounds like your just putting weights on the top of the pipe. Do the weights push a cylinder down?

read the thread from the beginning
he test how much pressure this fiting can take (hydraulic oil not air pressure>)
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