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strong enough? and clear pipe.

This area is for the discussion of BB or airsoft sub machine guns, and or other small arms such as pellets.
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strong enough? and clear pipe.

Unread postAuthor: adem70 » Wed Apr 28, 2010 10:10 pm

I am building an inline vortex bbmg, the parts are going to be machined out of aluminum, and the pipe will be either pvc or abs. now, the problem is, the hpa tank i am getting outputs at 800 psi... would the pipe be able to hold up to this pressure? it will be 2" ID. Also, where can I find the clear pipe that I have seen on bbmg's? and what is it rated at? thanks.
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Unread postAuthor: Crna Legija » Wed Apr 28, 2010 10:18 pm

what material is the 2 inch pipe your using?

its 800 psi in the chamber but then it get to the bbmg it will lose lots, jsr has made hpa bbmg and he used epoxy so if your using alu should be fine
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Unread postAuthor: adem70 » Wed Apr 28, 2010 10:36 pm

the 2 inch pipe will be either sched 40 pvc or abs, or if i can find out what clear pipe everybody is using, it could possibly be that.
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Unread postAuthor: Crna Legija » Wed Apr 28, 2010 11:19 pm

the clear pipe is usually acrylic but i wouldn't use that on a hpa bbmg
use steel or alu if you can
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Unread postAuthor: deathbyDWV » Wed Apr 28, 2010 11:20 pm

Don't even think about using that pipe. You need a regulator or metal pipe.

It would be okay because the air is just flowing through and not reaching the full 800 psi but what I it jams, blocking the barrel and building pressure? Then you've got plastic shrapnel in your face...
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Unread postAuthor: Moonbogg » Wed Apr 28, 2010 11:57 pm

I seem to remember an 800psi epoxy BBMG EXPLODING.
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Unread postAuthor: mark.f » Thu Apr 29, 2010 4:46 am

While I've generally seen plenty of DWV BBMG's running at 125 PSI in, using PVC with unregulated CO<sub>2</sub> or 800 PSI regulated HPA is just asking for trouble. You have an extremely cold gas entering a brittle chamber at a flow that may or may not be matched or exceeded by the flow of air out of the barrel. To me it seems like a recipe for pain.
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Unread postAuthor: adem70 » Thu Apr 29, 2010 7:25 pm

the tank i am gettin comes with a regulator, but it outputs at 800 psi, and im not sure if it can be adjusted differently, I would preffer it it output at around 200... anybody know of any adjustable regulators? and would an aluminum pipe be strong enough to hold up to the 800 psi like said above?
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Unread postAuthor: irisher » Thu Apr 29, 2010 7:43 pm

Link This is very good adjustable reg that will get you to 200 psi.
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Unread postAuthor: adem70 » Thu Apr 29, 2010 7:44 pm

Whats the PSI range on that, and do you know of a guide on how to adjust it?
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Unread postAuthor: irisher » Thu Apr 29, 2010 7:47 pm

It adjust with hex screw on the top. For drastic pressure adjustments it can be disassembled in the middle and shims added or removed. I'm not positive on the pressure range but mine seems to work ~0-800.
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Unread postAuthor: adem70 » Thu Apr 29, 2010 7:52 pm

ok that sounds like my range, do you know of a spec list for it? so i can have it bookmarked?
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Unread postAuthor: jackssmirkingrevenge » Fri Apr 30, 2010 12:16 am

Moonbogg wrote:I seem to remember an 800psi epoxy BBMG EXPLODING.


If done incorrectly, epic fails will ensue.

In a normal BBMG the actual chamber pressure is much lower than the fill pressure (jimmy calculated 18.6 PSI from a pump outlet pressure of 120 PSI, I had measured less than 20 psi from an input of 110 psi) so chamber construction is not that stressed most of the time, but if like in my case you're using a detent or should a BB jam in the breech or barrel, pressure will rise in the BB chamber possibly equalising with the air chamber, so this is a contingency that must be planned for.

If you have good machining facilities, a possible solution is to armour the clear pipe, have a section of aluminium sleeved over it with slots cut into it.
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Unread postAuthor: bobgengeskahn » Fri Apr 30, 2010 2:35 pm

adem70 wrote:the tank i am gettin comes with a regulator, but it outputs at 800 psi, and im not sure if it can be adjusted differently, I would preffer it it output at around 200... anybody know of any adjustable regulators? and would an aluminum pipe be strong enough to hold up to the 800 psi like said above?


usually, if it says that there is a "reg" on the tank, its not really a "reg" what it means is that there is a part built into the tank adaptor that will prevent pressure spikes from allowing liquid CO2 into the line or system. on a warm day gas CO2 will get above 800psi (the pressure that results when CO2 vaporizes into gas from liquid) on a hot day it will build up to higher pressures, and if you get liquid into the system... there will be serious problems...

so yes, you should get a regulator to go after the tank. My palmers reg will do 200-800 with the stock spring in it, so it can give me the option to adjust wherever I want, most regulators will give you that choice.
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