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2-liter bottle capacity

K

kevinthenerd

Platinum Member
Cliff notes in bold

I need a cheap way to store a high pressure volume of air. How many psi of pressure will a typical 2-liter used bottle of soda hold? Ignore the cap; I'll be glueing a pipe directly to the end, and with 3500psi 2-part plastic welder epoxy, the cap strength will be negligble.
 
i wouldn't imagine that you'd be able to store much, especially once the seal is open. plastic is pretty worthless when it comes to HPA, and the cap will be leaky. just follow phasmatis' advice and get a cheap paintball tank.


=|
 
they make some cheap aluminum tanks for paintball. spend the $20 or less so it wont blow up in your face. you dont want to go blind do you? pron will be alot harder to enjoy when you are blind.
 
Originally posted by: cerebusPu
they make some cheap aluminum tanks for paintball. spend the $20 or less so it wont blow up in your face. you dont want to go blind do you? pron will be alot harder to enjoy when you are blind.
Click to expand...

omg teh braille pr0n
 
Heh, I was thinking old-school Super Soaker tank over a 2 liter, but the metal paintball ones a couple other people suggested would probably be a better choice 😛.
 
Originally posted by: PhasmatisNox
Originally posted by: cerebusPu
they make some cheap aluminum tanks for paintball. spend the $20 or less so it wont blow up in your face. you dont want to go blind do you? pron will be alot harder to enjoy when you are blind.
Click to expand...

omg teh braille pr0n
Click to expand...
LMFAO!
 
lol, most portable WELDED STEEL air compressor tanks only hold up to 180 psi or so.

You want to hold 20x that?

Good luck. You'll need at least half inch thick steel--probably closer to inch thick welded steel and a heavy duty valve to be able to hold 3500 psi.
 
I've built rockets using a 2 liter bottle and air/water as a propellent. IIRC, the bursting strength of a 2 liter bottle is around 150 - 200 psi
 
Originally posted by: kevinthenerd
Cliff notes in bold

I need a cheap way to store a high pressure volume of air. How many psi of pressure will a typical 2-liter used bottle of soda hold? Ignore the cap; I'll be glueing a pipe directly to the end, and with 3500psi 2-part plastic welder epoxy, the cap strength will be negligble.
Click to expand...

The EPOXY is rated at 3500 psi. Do you people read before you jump on someone?
 
Originally posted by: slag
lol, most portable WELDED STEEL air compressor tanks only hold up to 180 psi or so.

You want to hold 20x that?

Good luck. You'll need at least half inch thick steel--probably closer to inch thick welded steel and a heavy duty valve to be able to hold 3500 psi.
Click to expand...


Not quite. Paintball and SCUBA equipment go into the multi-thousand PSI range. Although, a 0.005 thick wall of plastic won't come close.
 
For what it's worth, from one of the physics sites (the rockets are common physics projects)
1. Have a limiting device on all electrical compressors to keep
bottles from being over pressurized. The industrial
specification of burst pressure from one manufacturer
is approximately 175 psi but bottle designs vary and
bottles can burst at lower pressures due to bottle type,
fatigue from overuse, poor construction techniques, or
exposure to sunlight. We recommend using pressures of
90 psi or less. Under no circumstances should you attempt
to perform a bottle burst test.
Click to expand...
 
to get to 3500 psi you need a high pressure SCUBA tank or similar... However, he said the weld was 3500 psi not the bottle...
 
Ok, forget it. I'm gonna get a set of safety goggles and whatnot, and I'm gonna do my own burst tests of a few. I think I'll use a 3-liter bottle instead, too, just to hold more air. If I can store 50% more volume at 90% of the original pressure, I'll still be ahead.

If I find that they all break at the same spot, I just might end up reinforcing it or something. We'll have to see.

If I'm not blind or dead, I'll post the data if I ever get around to doing this.
 
Originally posted by: Mwilding
to get to 3500 psi you need a high pressure SCUBA tank or similar... However, he said the weld was 3500 psi not the bottle...
Click to expand...


Hrmm... I wonder what they do with old SCUBA tanks that aren't "certified" for diving any more.
 
It may be able to hold 200-300 PSI for a short duration, but 50psi is actually more than enough to slowly stretch the plastic making it gradually get thinner till it bursts.
 
2 liter bottle can do about 60-70 PSI safely, they are commonly used for water bottle rockets.. etc...

Another option is PVC pipes, PVC pipes are stronger than metal pipes (holds way more PSI).
Even high strength PVC pipes can only hold about 500-600 MAX PSI.


In other words, DONOT use 2 liter bottles!

If you want to hold extremely high PSI, you need ultra thick metal storage tanks.

Oh btw what do you need this for?
I have quite a bit of experience with PSI / containers for different kinds of water / air rockets / launchers.
Won stateat numerous related competitions.
 
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