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Tank output pressue and marker operating pressure

paintball marker tank hpa ninja

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#1 Paintballhustler

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Posted 10 November 2013 - 09:24 PM

Ok so the new Ninja Dura 68/45 tanks have an output pressure between 450-850. So lets say you put it at 450psi. So I have a 2014 Proto reflex rail that has an operating pressure of 145psi. So my question is where does the other 305psi go is it lost in the marker and if so why wouldn't it be more efficient to have it match the markers operating pressure.



#2 andrewthewookie

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Posted 10 November 2013 - 09:27 PM

The gun's high pressure regulator takes the tank output and regulates it down to the gun's operating pressure. It also makes no difference in efficiency if your tank is at 850 or 450 psi.


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#3 Paintballhustler

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Posted 10 November 2013 - 10:10 PM

ok thnx so what happens to the other psi cus if the reg only uses 145psi like in the 2014 proto reflex rail. does it just stay in the reg.



#4 andrewthewookie

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Posted 10 November 2013 - 10:54 PM

Two important equations from thermodynamics are P1V1=P2V2, and PV=nRT. The first one states that given a fixed amount of air, the volume and pressure of that amount of air will always be related. Say you have 50psi of air in a 1 cubic inch volume, then if you increase the pressure to 100psi, it only needs one half the original volume. (50psi)(1ci)=(100psi)(0.5ci). The second one is referred to as the ideal gas law. It means that the pressure times the volume equals the amount of air times the gas constant (R, it is always just a number and not a variable), and the temperature.

 

With those two equations, we are able to understand why you don't lose energy regardless of the input from the tank.

 

When a volume of space fills up with a gas, it goes from atmospheric pressure to whatever pressure is coming in. Since the reg is set at 145 psi, it will go from 0 psi to 145 psi. Now, since the gun has a fixed volume that never changes, and it is always 145 psi in the gun, the amount of air that is used per shot is exactly the same.

 

Because the amount of air going into the gun is always the same, that means the same amount of air will always come out of the tank. One thing to remember, the same amount of air does not mean the same volume of air. Let's say we have our 850psi output from the tank. (850psi)(X volume) = (fixed amount of air)( R )(T). In this instance, R and T can be ignored since they are irrelevant constants in the equation. Basically, 850x = a fixed amount. If we change the tank reg to 450psi, then we have (450psi)(Y new volume) = (fixed amount of air)( R )(T), which we can say 450y = a fixed amount. Since the amounts are the same, we can say 850x = 450y. This means that for the different outputs of the tank, different volumes of air will come out, but not different amounts of air.

 

TL;DR - an 850psi tank will put out less volume of air at a higher pressure to fill the gun, and 450psi will put out more volume of air at a lower pressure to fill the gun, both use the exact same amount of air.


Edited by andrewthewookie, 10 November 2013 - 11:08 PM.

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#5 BurningPlaydoh

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Posted 11 November 2013 - 02:07 AM

ok thnx so what happens to the other psi cus if the reg only uses 145psi like in the 2014 proto reflex rail. does it just stay in the reg.

PSI is just a metric for pressure. Its not a physical quantity of anything. There isnt anything to "stay". The reg just allows a certain pressure of air to flow through. Like taking the nozzle off a fire hose although that analogy doesnt fit the way a reg works at all.

Maybe a better analogy is someone standing at the end of a hallway that people are running through and telling them to walk instead. There are the same amount of people there in the hallway but the ones at the end are just forced to go slower after exiting (lower pressure).

Edited by BurningPlaydoh, 11 November 2013 - 02:12 AM.


#6 junits15

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Posted 12 November 2013 - 03:40 PM

it doesn't get rid of the extra air it just manipulates it so that the pressure is lower. In simple terms imagine that it slows down the flow of the air and allows it to expand so that the pressure is lower.  Pressure is not a measure of quantity by itself.


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