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Old 07-25-2013, 11:59 AM   #1 (permalink)
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Stored Energy

I've got a formula sitting in front of me for calculating the stored energy of a cylinder. If you give me the length, diameter, and pressure of your tank, I can calculate the amount of stored energy in Joules, and the equivalent mass of TNT.

68/4500, Full
I don't have an entirely accurate measurement, but it's about 160KJ, or .11 pounds of TNT
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Old 07-25-2013, 12:11 PM   #2 (permalink)
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That sounds interesting. I don't have my tank in front of me.

Mine is a ninja 68/4500. If you wanna look up the specs on their site, and lets say I'm holding 3500 psi in standby on the tank. What is the result in stored joules?

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Old 07-25-2013, 12:35 PM   #3 (permalink)
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That sounds interesting. I don't have my tank in front of me.

Mine is a ninja 68/4500. If you wanna look up the specs on their site, and lets say I'm holding 3500 psi in standby on the tank. What is the result in stored joules?
About 124KJ, or .08 pounds of TNT. It's much less than I was expecting.
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Old 07-25-2013, 01:33 PM   #4 (permalink)
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About 124KJ, or .08 pounds of TNT. It's much less than I was expecting.
It's proportional to the pressure and volume, for simple stored energy.

The tank pressure and standard volume moves on a squared relationship, so that 2250 psi is actually a quarter of the fill of a 4500 psi start, not a half.

***

What separates it from a simple spring calculation is that you are releasing a piece of your spring on every shot, not just the energy stored in the spring.
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Old 07-25-2013, 02:31 PM   #5 (permalink)
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But what if that 68/4.5K was stored with liquid co2?
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Old 07-25-2013, 03:46 PM   #6 (permalink)
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About 124KJ, or .08 pounds of TNT. It's much less than I was expecting.
Wow, they still make some impressive damages when treated wrong lol. I believe anything under any kind of pressure is volatile. .08 pound of tnt is still an explosion
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Old 07-25-2013, 04:32 PM   #7 (permalink)
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Wow, they still make some impressive damages when treated wrong lol. I believe anything under any kind of pressure is volatile. .08 pound of tnt is still an explosion
It's a lot of energy, if you consider that a Ford Fusion engine pretty much generate the same energy.
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Old 07-25-2013, 04:38 PM   #8 (permalink)
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Wow, they still make some impressive damages when treated wrong lol. I believe anything under any kind of pressure is volatile. .08 pound of tnt is still an explosion
Yes, and we haven't even considered 90ci tanks yet. I guess I could look up how big they are.

Imagine then, if you were in possession of your own source of air and you filled it to 5500psi. That'd be a significant explosion.

You also have to consider, TNT explosions create a lot of light, a lot of heat, and a lot of sound. They also involve a change of state. Compressed air explosions have a more direct explosion, with energy being wasted on heat and sound, but not light or a change of state.
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Old 07-25-2013, 05:02 PM   #9 (permalink)
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Every time I go out and play, I'm cradling an explosion waiting to happen...
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Old 07-25-2013, 05:07 PM   #10 (permalink)
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Every time I go out and play, I'm cradling an explosion waiting to happen...
Yes, you are. Not to worry though, you'll probably only lose the hand that's holding the marker, and maybe part of your torso.
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