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| POLAND_SPUD |
 Posted: 01/11/2008 18:41 PM Post subject: |
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Brigadier General
Joined: 13 Oct 2007
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I am just wondering... what type of fittings do you use most of the time ? steel, brass or iron ? iron is likely to have the lowest burst pressure of all three right ? anyidea what is the operating pressure of 1/2" iron fittings becasue I have LOTS of them
ALI i've already taken my QEV to 250 psi... but I am still waiting for your results before I go above 300 or near 400 psi...  sorry I am too afraid of dammaging my precioussssss QEV
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| ALIHISGREAT |
| Posted: 01/12/2008 2:30 AM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
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| POLAND_SPUD wrote: | I am just wondering... what type of fittings do you use most of the time ? steel, brass or iron ? iron is likely to have the lowest burst pressure of all three right ? anyidea what is the operating pressure of 1/2" iron fittings becasue I have LOTS of them
ALI i've already taken my QEV to 250 psi... but I am still waiting for your results before I go above 300 or near 400 psi... sorry I am too afraid of dammaging my precioussssss QEV
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ermm well iron is the cheapest and brass is used more for smaller sizes and i haven't used steel yet.
and its alright for me to damage mine but not for you to damage yours and if your polish QEVS are soo cheap maybe you should try with yours first...
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| POLAND_SPUD |
| Posted: 01/12/2008 10:08 AM Post subject: |
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Brigadier General
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OK I've tried first.....  today I finally had some time for spudding.... I've fired atleast 15 shoots at 300psi.... and one at ~ 340 psi
I openned the QEV and piston still looks perfectly ok... so i assume that there wouldn't be any problems with using QEVs at 400 psi
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| ALIHISGREAT |
| Posted: 01/12/2008 12:41 PM Post subject: |
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Eternal Noob
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| POLAND_SPUD wrote: | OK I've tried first..... today I finally had some time for spudding.... I've fired atleast 15 shoots at 300psi.... and one at ~ 340 psi
I openned the QEV and piston still looks perfectly ok... so i assume that there wouldn't be any problems with using QEVs at 400 psi |
hmm i didn't foresee any problems but i think the problems (if any will come after lots of use at 400psi but that shouldn't be a problem as i won't be using 400psi all the time.
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| POLAND_SPUD |
| Posted: 01/12/2008 14:41 PM Post subject: |
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| DYI |
| Posted: 01/12/2008 14:48 PM Post subject: |
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Depends what kind of brass pipe. All copper tube 1" and under has a burst pressure of over 3kpsi. SCH 80 brass pipe would be incredibly strong, but horribly expensive. Copper tube is more economical than brass pipe in all sizes. Brass just isn't worth it. Steel is better than brass for non-corrosive applications, and far, far cheaper.
Normal 1/2" SCH 40 malleable iron fittings are rated for 150 psi, and have a burst pressure of well over 2kpsi. I've personally used malleable iron fittings in 2" size up to 470 psi, repeatedly, with no ill effects, even in extreme cold.
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| POLAND_SPUD |
| Posted: 01/12/2008 14:52 PM Post subject: |
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DYI thx....
but i don't get it brass is not practical ? It would be great for barrels becasue there are lots of sizes available..... and for chambers too - 24X4 mm pipe for 4 pounds per 1 kg... it's even cheaper than the 16 mm one... and cheaper than steel...
Last edited by POLAND_SPUD on 01/12/2008 15:20 PM; edited 1 time in total |
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| DYI |
| Posted: 01/12/2008 14:56 PM Post subject: |
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| Well, there is no such thing as copper pipe for one thing. If you tell me the schedule of the pipe, or dimensions, as well as the fatigue strength of the brass that the pipes are made of, I can give you a rough idea of their burst pressure.
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| POLAND_SPUD |
| Posted: 01/12/2008 15:41 PM Post subject: |
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soo copper pipes are acctually brass pipes ? sorry I've been using steel only so I don't know much about copper pipes/fittings......
what about this size, 24 mm either ID or OD, it's not stated anywhere; 4 mm thick wall...
it is M63z4 (it's a name of alloy I found that it is more often described as CuZn37 Rm370; when I googled CuZn37 it turned out that the number 37 tells how much Zn there is in this alloy.... )
http://www.imnr.ro/aliaj13eng.htm - and this suggest that it is possibly the 'standard' brass used in pipes
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| ALIHISGREAT |
| Posted: 01/12/2008 15:56 PM Post subject: |
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Eternal Noob
Joined: 25 Aug 2007
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could someone please GGDT this gun for me because i can't get it for various reasons.
28mm x 50cm chamber
25mm piston with a 20mm porting piloted by a 1/2" qev
20mm x 1.5m barrel (17.5mm id)
operating pressure 400psi 
ammo 0.68 paintball (17.27mm i think)
anything i have missed?
thanks Alasdair
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| DYI |
| Posted: 01/12/2008 16:10 PM Post subject: |
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There is copper tubing, but no copper pipes.
@Ali: I can't do the GGDT because I don't know the QEV specs. I'm sure someone around here does though.
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| al-xg |
| Posted: 01/12/2008 16:21 PM Post subject: |
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Staff Sergeant
Joined: 19 Jan 2007
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| 7.8CV flow ; 2ms open time something like that
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| ALIHISGREAT |
| Posted: 01/12/2008 17:35 PM Post subject: |
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Eternal Noob
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| DYI wrote: | There is copper tubing, but no copper pipes.
@Ali: I can't do the GGDT because I don't know the QEV specs. I'm sure someone around here does though. |
well Al-XG gave some specs and it doesn't have to be spot on.
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| POLAND_SPUD |
| Posted: 01/12/2008 18:19 PM Post subject: |
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I have no idea how much does 0.68 paintbal weights so I put 15g projectile instead.
with 2 grams projectile instead - GGDT shows 384 m/s
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| ALIHISGREAT |
| Posted: 01/12/2008 19:28 PM Post subject: |
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Eternal Noob
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thanks, they were the kind of performance figures i was hoping to see i think paintballs are 3-4g and i might just have to make myself some 15g ammo because 330j is one hell of alot of power
edit: could you also model it with a lighter piston because i'm using hdpe which is ~0.94/cm3 so i would need a 50cm3 piston to do that which would be more than 10cm long  so a 5cm piston would be 23g and the valve is a barrel not chamber sealer thanks Alasdair
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