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View Full Version : what happens to a 3k if you overfill it?

IdiotWithAFlash
11-05-2004, 05:06 PM
i have a 47cu 3k steel tank, and my gauge goes to 6000psi and my birst disk seems to be at 5k, but the tank says it is at 3000 psi. i just got it and my dad asked me "what if you fill it to 4500? i dont honestly know... i know it is unsafe and would never try it, but is it possible?
slothman
11-05-2004, 05:23 PM
I think theres a second burst disk on there that would burst if you filled it to that, maybe:confused:.
IdiotWithAFlash
11-05-2004, 05:27 PM
my thoughts... i mean why have a 5k burst disk if the tank can only go to 3000?
I.A.O.A.B
11-05-2004, 05:29 PM
BOOM!
DarkKnight1312
11-05-2004, 05:33 PM
Originally posted by I.A.O.A.B
BOOM!

Well said
IdiotWithAFlash
11-05-2004, 05:37 PM
:laugh: well, it was a stupid question... i just have a lot of free time... like the rest of you
clown_13_2001
11-05-2004, 06:25 PM
And if it doesn't explode, it will probably cause pressure on the reg that is only rated at 3k psi, making a leak somewhere.
something nasty
11-05-2004, 06:45 PM
The reg. might start to leak. The tank will be fine. They hydrotest tanks to something like 175% of their PSI rating.
[Infusion]BigC
11-05-2004, 07:42 PM
Yeah, tanks can hold alot more then they are rated.

You would most likely just blow a burst disk and be sad.
teufelhunden
11-05-2004, 07:53 PM
You could put 4900 in the tank without a problem. It's just not rated for that, and at 5k the burst disk would go.


Search for the test, but one of the companies did a test and it took 17k PSI for a tank to explode [it was a 4500 PSI tank, however,]
Canadia_PBaller
11-06-2004, 10:12 AM
Originally posted by I.A.O.A.B
BOOM!



STFU Noob. A 3000psi tank obviously needs to be able to hold above 3000psi, or else it wouldn't be deemed very safe, now would it? For hydro testing they take 3000psi (or 4500, or 5000) and times it by a certain number. Once they get it to that number, as Teuf said I think it was 4900, they fill it to that.......thats how they hydrotest.
LAMANTEthePBguy
11-06-2004, 12:35 PM
It would be fine. The tank isn't rated for that working pressure, though. The burst pressure is over 5k psi, so they have a burst disk to prevent it from exploding. They have to make the tanks stronger than their WP to account for fluxuations and user error. Otherwise you would be hearing of many more injuries from tanks. If you did, it may harm the structural integrity, but it probably wouldn't. Under no circumstance should you fill it to 4500psi though.

Also, the test teuf is describing used a carbon fiber tank, while yours is steel.
IdiotWithAFlash
11-06-2004, 12:40 PM
cool, question answered, now no one post and let the thread die in peace
painterballer
11-06-2004, 12:51 PM
a little off topic, but has anyone every tryed to pressurize their tank by blowing in through the nipple???
LAMANTEthePBguy
11-06-2004, 12:56 PM
Originally posted by painterballer
a little off topic, but has anyone every tryed to pressurize their tank by blowing in through the nipple??? 1. You probably wouldn't be able to create enough pressure to even get air past the nipple

2. If you did, I would estimate the pressure of your breath is about 10psi. Please direct me towards the marker that can shoot at that pressure. And if you didn't plan on shooting the pressure, you need to find a better source of entertainment.

3. You will get moisture in your tank. This is not good for your tank, and that is why it is suggested to leave some pressure in your tank to seal the vavle. Your breath has more moisture than the air also.

4. Think then post. Always in that order.
spyderuser 123
11-06-2004, 01:35 PM
yeah, I tried blowing up my tank with my mouth thru the fill nipple, and a few days later when I got my tank filled it was leaking out the fill nipple, so after the tank was empty, I took the fill nipple off and it was all rusty on the inside.
comando345
11-06-2004, 07:44 PM
Originally posted by I.A.O.A.B
BOOM!
paintballer42o
11-06-2004, 09:01 PM
Your burst disk will....burst.
chibissj
11-06-2004, 09:13 PM
how would you know that your burst disk goes to 5k?

Also the tank won't fill past 3000 why? because the space in the tank is full, the pump stops being able to pump air into the tank.
[Infusion]BigC
11-06-2004, 09:30 PM
Originally posted by chibissj
how would you know that your burst disk goes to 5k?

Also the tank won't fill past 3000 why? because the space in the tank is full, the pump stops being able to pump air into the tank.

Burst disks are labeled, and if you hooked it up to pump for filling 4500psi tanks then you could fill past 3000psi.
chibissj
11-06-2004, 09:40 PM
how..wouldn't the pump only pump 3k into the tank because the tank can only hold volume wise 3k...
blinkpk11
11-06-2004, 09:52 PM
Originally posted by chibissj
how..wouldn't the pump only pump 3k into the tank because the tank can only hold volume wise 3k...

no 3000 psi is a pressure measurement. the cubic inch rating of your tank is the volume. your tank always holds x cubic inches of air, just sometimes it is uncompressed. if it is at a lower pressure, tha means there is less moles (mass) of air in the tank therefore less air, but it still fills the entire volume. when you pump more moles (mass) of air into the tank, the volume remains unchanged, but the pressure increases. hope that was an ok explanation...
chibissj
11-07-2004, 12:29 AM
Yeah i think it was just that I was tired and wasn't even thinking volume's measurement.

Then wouldn't his tank fill to 4500? and no more because no place has pumps that pump more than that.
[Infusion]BigC
11-07-2004, 12:37 AM
Originally posted by chibissj
Yeah i think it was just that I was tired and wasn't even thinking volume's measurement.

Then wouldn't his tank fill to 4500? and no more because no place has pumps that pump more than that.

I know of places with boosters that go up to 5000psi, but, yes, most places only fill up to 4500psi.
teufelhunden
11-07-2004, 04:40 AM
Originally posted by chibissj
Yeah i think it was just that I was tired and wasn't even thinking volume's measurement.

Then wouldn't his tank fill to 4500? and no more because no place has pumps that pump more than that.

The pump isn't intelligent and doesn't know what pressure the tank holds. Hence why someone operates the pump.

The only way a pump would cut off at 3k is if there was something on the compressor that limited the max output pressure at whatever the tank was rated at. And it'd need to be set by a person.
suXor
11-07-2004, 05:00 AM
Originally posted by chibissj
Also the tank won't fill past 3000 why? because the space in the tank is full, the pump stops being able to pump air into the tank.

:confuse:
LAMANTEthePBguy
11-07-2004, 02:56 PM
Originally posted by chibissj
Also the tank won't fill past 3000 why? because the space in the tank is full, the pump stops being able to pump air into the tank. It would stop if you were filling off of a SCUBA though.
I.A.O.A.B
11-07-2004, 02:59 PM
holy ***, i was kidding. but, whatever
IdiotWithAFlash
11-07-2004, 05:13 PM
when filling off a tank the bottle will only equalize, if you have a tank with 2100psi, no matter how long you hold it there, it will only fill the tank to 2100 psi, that is why fields usually use pumps and not tanks.
painterballer
11-07-2004, 05:31 PM
does anyone know where to buy an aircompressor that fills 3000-4500 psi, and how much would one cost?
chibissj
11-07-2004, 05:44 PM
Don't exactly know where to get them, but I do know they're expensive! Very expensive.
teufelhunden
11-07-2004, 06:01 PM
Originally posted by painterballer
does anyone know where to buy an aircompressor that fills 3000-4500 psi, and how much would one cost?

Thousands.

You'd be better off getting a few SCUBA tanks and filling off those. It might cost you a few hundred bucks.. but it's that or thousands. Get some friends to go in with you and it won't be terrible, especially since then you could buy a cheaper tank for your gun since you have your own all day air.