New 300 bar air tank questions 🤔

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alejo

alejo

Member
Jul 23, 2020
222
63
Ca, United States
Hello everyone, since now we are able to fill our tanks at 300 bar with the help of the small “compressor “ in some cases , my questions are:

how many times will you filler it up at 300 bar with a scuba tank? My white shark it’s filled at 4500 psi, maybe a little bit more some times but once you star topping off your tank you losing air pressure , for my tank which is 580 I can filler up like 4-6 times at 250 bar, let me explain when I’m shooting I don’t go lower the 150 bar on my reg just to be consistent on my FPS (speed) so it’s about 100 bar where I stay on, but with the 300 bar is it worthy to go with the 300? Let me ear from you. Thanks and be safe.
 
I don't quite understand your question.

When you say "filler it up" are you referring to the gun, or the scuba tank? I take it you are wondering how many times you can fill up a gun, depending on things like your tank pressure and volume capacity, your gun's pressure and volume capacity, and at what pressure you choose to refill your gun? 

I worked that out once. 

You can use Boyle's law to get an idea for how many full-pressure fills you'll get out of a tank. https://en.wikipedia.org/wiki/Boyle%27s_law

It states that in a pressurized vessel, as you change the volume (like compressing with a piston) the product V*P remains constant, where V is the volume of the container, and P is the pressure on the walls.

So the number of full pressure fillings your gun will get from a given tank will be a little larger than product of the two quantities:

(Volume of your scuba tank / volume of your gun's tank)

(Max pressure of your scuba tank / filling pressure of your gun).

So for my 1639 cm^3, 4500 psi tank and 192 cm^3 4350 psi leishy, this gives me about 9 complete fills.

This is assuming you drain your gun completely every time, which isn't realistic.

If I consider that I stop using the gun when the PSI drops below a threshold that would give me a better estimate. You would multiply the two quantities below:

(Volume of your scuba tank / volume of your guns tank)

(Max pressure of your scuba tank / (max pressure of your gun - regulator pressure)).

The regulator on my gun is set to 130 bar or 1885 psi, so say I usually stop shooting once I hit the regulator, that would give me 15 or 16 complete fills of the gun, which sounds about right. . . although numbers will always vary a little as you may not fill your gun up to max capacity (which would make the number go up), the system could have leaks (which would make the numbers go down), you might stop shooting before or after the regulator pressure is hit (which would make the number go up or down respectively).
 
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Even though your tank is suitable for 300 bar FX suggests filling their guns to only 250 bar.

The negative to filling to the higher fill pressure is the strain on your gun. Things never last as long when you use them at their max all of the time

If your gun is other than FX then I cannot say what their suggestions are on fill pressures.

Naturally if you fill your 580cc tank to 300 bar with your Great white that is filled to 4500psi you will get less full fills than if you fill to 250 bar. Probly like two or three full fills.

It really does not matter that much though as the only plus to filling to the higher psi is a little higher shot count and not filling as often. 

Here is a fill calculator for figuring out how many fill you will get;

https://www.calc.sikes.us/2/
 
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