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Pressure rating issues

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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Pressure rating issues

Unread postAuthor: DC » Sat Jul 24, 2010 12:44 pm

Alright so I my other account magically dissappeared so this thing is telling me im a rookie so.... lol ANYWAYS
I'm working on a grenade launcher for paintball and I need to know what pressure i should work around? i know the average psi of my co2 tank is anywhere from 2200 to 2800...i plan to have a main chamber that i would fill with a co2 tank then just a quarter turn ball valve to dump it all (unless someone has a better idea?) anyways throw some ideas out there
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Re: Pressure rating issues

Unread postAuthor: jackssmirkingrevenge » Sat Jul 24, 2010 12:55 pm

DC wrote:i know the average psi of my co2 tank is anywhere from 2200 to 2800...


Depending on ambient temperature, it's actually 800-1000 psi

i plan to have a main chamber that i would fill with a co2 tank then just a quarter turn ball valve to dump it all (unless someone has a better idea?) anyways throw some ideas out there


What exactly is the ammunition you'll be using? And to what dimensions are you constrained?
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Unread postAuthor: DC » Sat Jul 24, 2010 12:58 pm

them funny lookin nerf darts lol
umm well i gotta be able to haul this thing on the field with me. it is for a scenario game tho(not as fast paced) so i guess size doesnt matter
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Re: Pressure rating issues

Unread postAuthor: SpudBlaster15 » Sat Jul 24, 2010 1:08 pm

DC wrote:i know the average psi of my co2 tank is anywhere from 2200 to 2800...


Do you store it in an oven?

The vapor pressure of CO2 on an average day ranges from about 800PSI to slightly over 1KPSI. For spudding/paintball applications, I would use a regulator and run the system at 100-200PSI, depending on your launcher dimensions.
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Re: Pressure rating issues

Unread postAuthor: jackssmirkingrevenge » Sat Jul 24, 2010 1:24 pm

SpudBlaster15 wrote:For spudding/paintball applications, I would use a regulator and run the system at 100-200PSI, depending on your launcher dimensions.


I guess a small metal chamber without a regulator and a ball valve would be the simplest option in this case, with such high pressure you don't really need a fast valve to send such a light projectile the required distance.
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Re: Pressure rating issues

Unread postAuthor: SpudBlaster15 » Sat Jul 24, 2010 1:32 pm

jackssmirkingrevenge wrote:I guess a small metal chamber without a regulator and a ball valve would be the simplest option in this case, with such high pressure you don't really need a fast valve to send such a light projectile the required distance.


I don't know anything about the OP's skills, so I was assuming that for him, building a 1KPSI capable pneumatic pressure vessel was out of reach. If DC has the required knowledge and ability, running an unregulated system is certainly possible.
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Unread postAuthor: DC » Sat Jul 24, 2010 6:49 pm

callin me a noob i see:P lol and for the record the psi i gave was from my filling station not my tank itself but regardless i want some level of safety in this thing i have any hopes of the refs allowing during game use. so a regulator is must
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Unread postAuthor: Ragnarok » Sat Jul 24, 2010 6:53 pm

DC wrote:for the record the psi i gave was from my filling station

CO2 "filling stations" are just a bigger bottle of CO2, and are consequently subject to the same pressures.

Are you sure this is a CO2 system and not HPA instead?
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Unread postAuthor: D_Hall » Sat Jul 24, 2010 8:06 pm

To be fair to the guy, a full CO2 tank on a hot summer day around here is WAY over 1000 psi. It shouldn't be up to 2000 (though just a bit of overfill will indeed get you there)...

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Unread postAuthor: PVC Arsenal 17 » Sat Jul 24, 2010 9:13 pm

If I were you, I'd go with a Palmers Pursuit Stabilizer and use a metal pressure chamber as JSR mentioned. Don't try to run unregulated CO2, it's dangerous and too inconsistent.

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Unread postAuthor: Lockednloaded » Sat Jul 24, 2010 10:48 pm

I would just go with something like this is you want to go unregged co2
[youtube]http://www.youtube.com/watch?v=3k2Da4CVuQo[/youtube]
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