Special Ops Paintball: never ever EVER made a homemade law - Special Ops Paintball

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never ever EVER made a homemade law i could have died

#16 Guest_Cesar_*

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Posted 13 April 2008 - 07:47 PM

your just lucky you didnt suffer any hearing damage...im glad your alright though.
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#17 User is offline   Blitzen 

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Posted 13 April 2008 - 07:48 PM

You either over pressurized it or the glue gave way. I have made several launchers and never had any problems with mine. You said your airchamber was 12" long? Out of what diameter PVC? Did you have a guage? Did you have a pop safety valve or a regulator? Homemade launchers can be pretty safe, but you have to know what you are doing.
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#18 User is offline   Inferenza 

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Posted 13 April 2008 - 07:48 PM

Pictures?
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#19 User is offline   gameystar333 

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Posted 13 April 2008 - 07:49 PM

the 12 gram might have had a lot of liquid compaired to the 9oz and it probably froze the pvc and weakened it.

that is my theory

drink lots of orange juice and have a cookie you might have lost a lot more blood than you think
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#20 User is offline   Florentine 

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Posted 13 April 2008 - 07:50 PM

i dont have pictures yet, batteries are charging.
the expansion chamber was 1 1/2 pvc pipe and 12" long.
im still hurting, im really sore
i used pvc cement
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#21 User is offline   Jackson 

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Posted 13 April 2008 - 07:52 PM

Regulators. Always use a regulator. For god sakes, what part of pressurizing a 350psi rated piece of PVC with +800psi sounded safe to you? Did you make the plans yourself or get them from somewhere? You are lucky. Very lucky.
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#22 User is offline   mtaylor 

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Posted 13 April 2008 - 07:55 PM

View Postflorentine, on Apr 13 2008, 08:50 PM, said:

i dont have pictures yet, batteries are charging.
the expansion chamber was 1 1/2 pvc pipe and 12" long.
im still hurting, im really sore
i used pvc cement


did you use primer? Did you use a regulator?

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#23 User is offline   Florentine 

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Posted 13 April 2008 - 07:56 PM

View PostJackson, on Apr 13 2008, 10:52 PM, said:

Regulators. Always use a regulator. For god sakes, what part of pressurizing a 350psi rated piece of PVC with +800psi sounded safe to you? Did you make the plans yourself or get them from somewhere? You are lucky. Very lucky.

from here. on the forums. i cant remember exactly where though. but i felt that the large chamber would take the presure down alot
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#24 User is offline   Blitzen 

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Posted 13 April 2008 - 07:56 PM

View Postflorentine, on Apr 13 2008, 09:50 PM, said:

i dont have pictures yet, batteries are charging.
the expansion chamber was 1 1/2 pvc pipe and 12" long.
im still hurting, im really sore
i used pvc cement

Umm...well no wonder it blew up. Did you do any research before you plugged all of this together? I believe you would have been okay if you had used steel piping, but there is no way a 1.5 diameter 12" long PVC pipe section is going to hold that much pressure.

You are a very lucky man
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#25 Guest_Cesar_*

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Posted 13 April 2008 - 07:57 PM

View Postflorentine, on Apr 13 2008, 10:56 PM, said:

View PostJackson, on Apr 13 2008, 10:52 PM, said:

Regulators. Always use a regulator. For god sakes, what part of pressurizing a 350psi rated piece of PVC with +800psi sounded safe to you? Did you make the plans yourself or get them from somewhere? You are lucky. Very lucky.

from here. on the forums. i cant remember exactly where though. but i felt that the large chamber would take the presure down alot

and this is why we dont talk about these things on the forums...and a 1.5x12 isnt that large of an expansion chamber....
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#26 User is offline   Jackson 

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Posted 13 April 2008 - 07:59 PM

View Postflorentine, on Apr 13 2008, 10:56 PM, said:

View PostJackson, on Apr 13 2008, 10:52 PM, said:

Regulators. Always use a regulator. For god sakes, what part of pressurizing a 350psi rated piece of PVC with +800psi sounded safe to you? Did you make the plans yourself or get them from somewhere? You are lucky. Very lucky.

from here. on the forums. i cant remember exactly where though. but i felt that the large chamber would take the presure down alot

I'm very surprised it held through the 9oz! Sorry come down on you hard, but you almost deserve a Darwin Award. A large volume is not going to bring down the pressure when you have more liquid boiling off into gas. The only way that works is if you boil all liquid off and then increase the volume beyond that. Regulators work wonders here.

If you use PVC for holding any pressure you MUST have a regulator. Always assume worst-case scenario that the pressure chamber will be holding the max psi of the air system (800 for non-regulated, lower for regulated). And for safety's sake, a blow-off valve is a good idea. Don't rely on the physics of gases expanding, you probably don't understand them well enough. And if you think you do, temp plays a big part, remember that. And then if you still think you know everything, the CO2 source can throw you a curveball and be over-pressurized, or have some other variation that throws off your calculations.

My point: Regulators are essential, never trust that you have enough volume to bring the pressure down.

This post has been edited by Jackson: 13 April 2008 - 08:04 PM

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#27 User is offline   mtaylor 

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Posted 13 April 2008 - 08:00 PM

View PostCesar, on Apr 13 2008, 08:57 PM, said:

View Postflorentine, on Apr 13 2008, 10:56 PM, said:

View PostJackson, on Apr 13 2008, 10:52 PM, said:

Regulators. Always use a regulator. For god sakes, what part of pressurizing a 350psi rated piece of PVC with +800psi sounded safe to you? Did you make the plans yourself or get them from somewhere? You are lucky. Very lucky.

from here. on the forums. i cant remember exactly where though. but i felt that the large chamber would take the presure down alot

and this is why we dont talk about these things on the forums...and a 1.5x12 isnt that large of an expansion chamber....


especially for a 9oz.

You are incredibly lucky it didn't blow plastic shrapnel into your entire body.

This post has been edited by mtaylor: 13 April 2008 - 08:01 PM


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#28 User is offline   Florentine 

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Posted 13 April 2008 - 08:01 PM

my leg
Posted Image
my finger
Posted Image
my wrist
Posted Image

and i did not put the whole 9 ounce in it. i had an on/off asa that i would open for about 1/2 second.
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#29 User is offline   Blitzen 

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Posted 13 April 2008 - 08:03 PM

View Postflorentine, on Apr 13 2008, 09:56 PM, said:

from here. on the forums. i cant remember exactly where though. but i felt that the large chamber would take the presure down alot

NOOOOO!!! A 1.5" x 12" air chamber is WAY TOO SMALL FOR PVC PIPE. You are lucky that it didnt break with the other c02 tank attached. Now a 1.5"-2" x 12" STEEL PIPING will be okay with 12 grames (I would stick to just 12 grams though).

Smaller air chambers will have more pressure, but less volume, where as bigger airchambers generally have less pressure and more volume.

Take these two videos for instance:

This first video has a very large air chamber shooting at 40 PSI
VIDEO 1

And this video has a smaller air chamber shooting at 95 PSI
VIDEO 2

Although both are shooting at different pressures, they still could get the same range.
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#30 Guest_Cesar_*

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Posted 13 April 2008 - 08:04 PM

now what you need to do is go play some paintball and when the littlin's come up and say "what happened to you?"...you can answer " i didnt wear my mask!"...
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