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Old 03-11-2013, 02:10 PM #1
spinny2559
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What transparent material can contain the highest PSI?

I am looking to build a transparent pressurized chamber to handle high PSI. I don't have a number in mind (for PSI), but as high as possible is the goal.

Thicker plastic soda bottles can handle around 150 PSI, but I'd like to go higher than that if possible.

Any ideas? And nothing that requires significant machining, something that can be built from almost readily available materials.


Thanks!!!
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Old 03-11-2013, 06:08 PM #2
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They sell clear PVC at Lowe's or Home Depot that is good to 350...you can custom order all kinds of high-pressure hose and tubing from New Age. Good stuff.
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Old 03-11-2013, 06:11 PM #3
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how big do you need it because clear macro-line does pretty good. otherwise im thinking Ur making a launcher so an old fire extinguisher should do it, here is a how to.
http://www.pbnation.com/showthread.php?t=3353230
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Old 03-11-2013, 06:24 PM #4
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I'm making a chamber to pressurize and vaporize alcohol. Needs to be bigger than macroline. At least a few inches in diameter AND transparent, so no fire extinguisher. I'll check out the PVC.
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Old 03-11-2013, 07:01 PM #5
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Quote:
Originally Posted by spinny2559 View Post
I'm making a chamber to pressurize and vaporize alcohol. Needs to be bigger than macroline. At least a few inches in diameter AND transparent, so no fire extinguisher. I'll check out the PVC.
oh yea transparent. the PVC is really hard to find in transparent unless you order online.
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Old 03-11-2013, 08:15 PM #6
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polycarbonate

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Old 03-11-2013, 08:39 PM #7
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Quote:
Originally Posted by spinny2559 View Post
I'm making a chamber to pressurize and vaporize alcohol. Needs to be bigger than macroline. At least a few inches in diameter AND transparent, so no fire extinguisher. I'll check out the PVC.
Quick question, will we see you on that moonshiners show?
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Old 03-11-2013, 09:30 PM #8
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Originally Posted by inmylife2415 View Post
Oh wow! We have a winner!
I need to find out where to look more into those.

Quote:
Originally Posted by pbkidminion View Post
Quick question, will we see you on that moonshiners show?
Shh.
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Old 03-12-2013, 11:11 PM #9
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Polycarbonate tubing is likely your best bet. Use the hoop stress formula to determine if it will hold the pressure, that is:

Stress = (pressure)*(inside diameter)*(1/2)*(1/wall thickness)

wall thickness by the way is ((outside diameter) - (inside diameter))*(1/2)

for units use psi and inches

Make sure that stress is less than about 8000. that gives you a little bit of a factor of safety but the smaller the stress the better.
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Old 03-13-2013, 10:55 AM #10
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Referencing post #9 (because the quote button is too far away), I understand the formula, but is it specific for polycarbonate tubing? If not, how can a formula be so general for so many different materials?
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Old 03-13-2013, 11:16 AM #11
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depends what you are making, but I say poly carbonate, or lexan sheets.

Sounds fun though
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Old 03-13-2013, 12:33 PM #12
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Be careful using plastic with alcohal,alot of times they arent compatible,check out TAP plastics online,the folks there can answer almost any question you have
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Old 03-13-2013, 01:14 PM #13
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Be careful using plastic with alcohal,alot of times they arent compatible,check out TAP plastics online,the folks there can answer almost any question you have
Thanks for the info.
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Old 03-13-2013, 06:09 PM #14
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Quote:
Originally Posted by spinny2559 View Post
Referencing post #9 (because the quote button is too far away), I understand the formula, but is it specific for polycarbonate tubing? If not, how can a formula be so general for so many different materials?
it's for all thick wall tubing. it will give you the stress in the material. the stress with be the same for all materials, you just have to compare that to how much stress a material will handle before failure.



and i'm surprised no one has said anything about glass.
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Old 03-13-2013, 10:17 PM #15
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it's for all thick wall tubing. it will give you the stress in the material. the stress with be the same for all materials, you just have to compare that to how much stress a material will handle before failure.



and i'm surprised no one has said anything about glass.
Hmm water seperator for a compressor?Would even have a bleed valve on the botton and plumbing in\out on top,something like this?
http://www.grainger.com/Grainger/SPE...lar&cm_vc=FFMP
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Old 03-14-2013, 12:52 PM #16
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Quote:
Originally Posted by spinny2559 View Post
Referencing post #9 (because the quote button is too far away), I understand the formula, but is it specific for polycarbonate tubing? If not, how can a formula be so general for so many different materials?
That formula works for most all cylinders. Once you have done the math and compute the stress you have to compare that to the materials yield stress. If you get a stress higher than the yield stress your pipe will deform. The yield stress for polycarbonate is somewhere between 9000 and 10000 psi so I chose 8000 do give you a little bit of safety.

Glass would probably work well too although I don't know where to get glass tube stock.
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Old 03-14-2013, 06:27 PM #17
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check science lab equipment websites, they should have just what you want
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Old 03-17-2013, 11:45 PM #18
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transparent aluminum duh
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Old 03-20-2013, 11:04 AM #19
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Look into some lexan, scroll to the bottom and look it up.
http://www.pblegion.com/showpost.php...0&postcount=14

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An Aardvark signature, the addition of a viewport that let the user watch the bolt movement in a high-pressure chamber was unique. Aardvark realized if they took the shot chamber sleeveand sealed offtheoutsidewith o-rings, there would be no reason they couldn’t cut off the body and get a view of the bolt. The only problem would be to find a materialdurableenough to handle the constant fluctuation of pressure in the shot chamber.

“I had this… well it’s sort of like a bicycle tire pump that goes up to super high pressures. I got a couple different materialsout and tested. Acrylic, I discovered, would blow up and shatter into horrible jagged pieces at about 1200 PSI. Lexan cracked and began leaking at 2200 PSI. Obviously I went with lexan for a longer lifespan. I would NOT recommend making a replacementtubeout of acrylic.” -Greg Duncan

Lexan is a material used in some airplane cockpits. It’s also marketed as being bullet-resistant. Of course, this has to be tested as well.

“Guns are illegal in Canada, so that made the bullet testing a little harder. Despite this, we had a friend with .22 pistol who agreed to help us out. We went down to my basement and set up a Matrix with a Lexan tube and a blue bolt inside. He carefully took aim and squeezed off two shots. The first shot made a dent in the tube. The second one penetrated and ended up lodged in the lexan, touching the blue bolt. Not too bad.” -Greg Duncan

Despite lexan being a very rugged and durable material, it will eventually go bad. Every time the Matrix is fired, the shot chamber is emptied and refilled with air, fluctuating between 0 and ~225 PSI very rapidly. Every time this happens, the lexan expands and contracts, like breathing. Over time, this causes stress fractures and, eventually, leaks. The Tequilashad a fairly largeviewablearea of exposed lexan. The more exposed area there is, the less support for the expansion and contraction of material. When Greg realized the limitations of the lexan, he shrunk down the size of the window for the TequilaSunrises. This givesthe tube more support and lets it last longer.
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Old 03-28-2013, 12:20 PM #20
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Quote:
Originally Posted by cpt_crunch View Post
Polycarbonate tubing is likely your best bet. Use the hoop stress formula to determine if it will hold the pressure, that is:

Stress = (pressure)*(inside diameter)*(1/2)*(1/wall thickness)

wall thickness by the way is ((outside diameter) - (inside diameter))*(1/2)

for units use psi and inches

Make sure that stress is less than about 8000. that gives you a little bit of a factor of safety but the smaller the stress the better.
ASME/ANSI typically requires a factor of safety of 2.0. Since you want a clear material, your max allowable stress level should be 1/2 of the yield stress. I recommend following this, especially dealing with what sounds like a shock load pressure.

Quote:
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it's for all thick wall tubing. it will give you the stress in the material. the stress with be the same for all materials, you just have to compare that to how much stress a material will handle before failure.

and i'm surprised no one has said anything about glass.
Its for any cylindrical pressure vessel. If geometry is the same, logically the only variable between different materials are going to be your modulus of elasticity which is material specific. Glass however is a bad idea because it is so brittle. Should you have a failure, you basically have a frag grenade.





Point 2 is where bad stuff happens.

As far as your original question, I think you should look at polycarbonate tubing. Ive seen people in the past actually machine autococker bodies out of blocks of the stuff and have little problem. Keep it out of sunlight if possible and dont leave pressurized.

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Old 03-28-2013, 07:50 PM #21
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Pyrex? That would be tragic if it blew though
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