What is a good Preset Tank for mags?

[SR_matt]

really depends on your set up. on a mag it should be fine (heck any gun with a good reg should be fine with it. it would (at least in theory) reduce shoot down as you tank gets low

an angel shouldnt matter any other than another gun, if you have a reg inbetween the valve and the tank it doesnt matter
-matt

[Beemer]

Someone is going to have to explain that one, :rofl:

Umm ya me too.

[Beemer]

but if I had to choose I would go with the Dynaflow b/c as the tank gets low on air it automatically bumps the pressure up so you never miss a shot. Not to mention, it has the best on/off system on the market. All you do is push the off button and the marker is completely drained of air.

Did you read that in the manual? The on, off is pretty slick.

I was thinking of getting a NitroDuck, but my field does not fill anything from NitroDuck. One of the guys that worked there told me because a player dived and the reg on the tank broke causing the tank to launch across the air and over the field.

Nooo, that will never happen, cant happen, wont happen, doesnt happen. Lets put 4500psi in a pressure vessel that wasnt designed to take impacts and run and dive with it. Know what smart people call that?

[GT]

A good thing on a mag. A bad thing for some other guns like angels. If the pressure goes too high you can get called out for shooting too hot. But since Mags have a reg on the valve it doesn't affect them.

I think angels have a reg too. Called the minireg

[UTDragun]

crossy blowing a lot of discs? hmm ive had mine for over 3 years and never blew a dics on it yet. which side are you blowing it out in the LP or the HP side? if its on the HP side your either getting bad discs or some one is over filling it. if its on the low side then it might need to be rebuilt.

-matt

the store I work for sells them and we get alot of people coming to us when they blow

I honestly dont remember which one blows, but it happens fairly often, theyre not overfilled, and happen at almost any pressure

[gus13]

I have an 88/45 PMI pure Energy that I use for my mag and it has worked great so far albeit heavy, I have not run into any probs with it and the recharge on it is superb. I also just picked up a HP 68/45 MacDev Legionnaire,I just haven't had a chance to use it yet.
Crossfires have always been really good air sources noone will argue with that... I believe

[turbo chicken]

you can add shims to just about any regulator to change the output pressure ... i say get something cheap and then take it to the local PB shop to get the shims put into it ...

[Shingo]

I'm planning on shimming my PMI 68/4500 to increase the output pressure. I know I'll have to change the burst disc to 3k to make this mod... but I'm wondering how much should I increase it? currently it's siting at 850 psi... would pushing the pressure to 950 psi be ok? how many psi can an average mag take before I start seeing problems?

Pulling long strings of paint on a Classic Valve PneuMag with a modified RT ON/OFF is showing some shootdown. the PMI reg does not keep up. would increasing the output pressure help?


questions questions questions... to shim or not to shim. that is my question.


~Shingo~

[Shane-O-Mac]

As the tank loses air the output creeps up. It can be nice/annoying.

ALL preset screwin regs do that, its a little known fact. Sometimes as much as 200 psi swing from full to 1000psi. Most adjustable regs do also (not as bad as presets), its the nature of regulators, thats why double regging is best on most guns. Not the Mag though, the air valve acts as the secondary reg.

Shane-O

[turbo chicken]

I'm planning on shimming my PMI 68/4500 to increase the output pressure. I know I'll have to change the burst disc to 3k to make this mod... but I'm wondering how much should I increase it? currently it's siting at 850 psi... would pushing the pressure to 950 psi be ok? how many psi can an average mag take before I start seeing problems?

Pulling long strings of paint on a Classic Valve PneuMag with a modified RT ON/OFF is showing some shootdown. would increasing the PMI's output pressure help?


questions questions questions... to shim or not to shim. that is my question.


~Shingo~

increasing pressure sounds like it might help a little ... but i don't think much ... a classic valve can only recharge so fast ....

there were some mods in the pneumag database ... that will help with the shoot down ...

[SR_matt]

the store I work for sells them and we get alot of people coming to us when they blow

I honestly dont remember which one blows, but it happens fairly often, theyre not overfilled, and happen at almost any pressure

hmm thats strange, when i worked at a field i never realyl saw crossys blowing, i saw pmis coming in all the time but never remember a lot of corssys


shingo

you shouldnt need to up the burst disk. and it probably would be un safe to as well, the disk will not go untill 1800 psi so even if you are putting 1500 psi into it it should not blow.

-matt

[Shingo]

Pneumag database... yeah, i should know the information in there. I'm the one that put the database together. The Electrician's instructions on how to up the Classic Valve ROF are pretty straight forward. I actually did the modifications on my classic already. Only thing I'm seeing is that PMI's reg can't keep up. 4 to 6 round burst is ok... But for long paint strings, either HP Reg sucks, or I can't walk the trigger right. I'm thinking it's my fingers. So I'm planning on sticking to my current setup.

For those who are curious:
I emailed PMI about upping the output pressure in their 68/45 and they responded that the rupture disc is rated at 1.8k only and anything over 875 psi from the output will cause the disc to vent. If this is true, then the only option is to either stick to the factory setting or put in a 3k disc if you shim.


~Shingo~



Disclaimer: I'm not responsible for your actions if you do any mods to your gun or air system. HPA Tanks are dangerous. Please be careful.

[SR_matt]

hmm well either the person didnt know what they are talking about at PMI or the disk is not 1800 psi.

a disk that is rated to X should not blow out (vent, purge what ever you want to call it) below that or else the dis is faulty

-matt

[Shingo]

hmm well either the person didnt know what they are talking about at PMI or the disk is not 1800 psi.

a disk that is rated to X should not blow out (vent, purge what ever you want to call it) below that or else the dis is faulty

-matt

I was thinking the same thing also. 1800 is 1800... how can 900 psi rupture a 1800 disc? I wonder if it has something to do with how regs creep up the output pressure as it starts to run dry. Or maybe the output pressure on their tanks are not stable and can have a jump in pressure to 1800+ psi during use.

Maybe someone here on AO knows more about the science on how the rupture discs works or explain how PMI came to their answer.

~Shingo~

[SR_matt]

i think it might be the excuse they want to give so they cant be responsible for any one getting hurt.

all a bust disk does is its a thin disk of brass/copper that when it reaches a set psi inside the tank the disk fails. if it was made to hold 1800 psi it will (save duds) it will hold 1800 psi.

-matt