Air Tank Ideas

[corax]

It's not the pressure I'm worried about, it's the liquid and the extremely low temperatures it brings combined with a fiber wrapped tank that worries me. The tank is basically made out of plastic and plastics don't do well when cold.

Could always ask the guy over at WabFab . . . iirc, he's a certified pressure vessel inspector, but I might be wrong about that

[Robinhood4x4]

He is and I'm sure he'd say the same thing. He's very skiddish when it comes to pressure vessels as he doesn't even like using fire extinguishers as air tanks.

[mastacox]

If the tank says air only, it's air only. The fact that it's a composite tank might mean it can't put up with colder temperatures of vaporizing CO2, but in addition to that the internal intake might be incompatible with liquid gas, making it more likely to release liquid CO2 into your regulator or fill line.

As for using them as OBA tanks, well sure its possible (as long as you don't tap the tank, use the existing hardware) but it seems to me they would be much more useful in their intended role as high pressure tanks.

[Crinale]

i wonder how hard it would be to find someone willing to fill that tank to 4000psi... also, how hard it would be to find a regulator that could regulate 4000psi to a more usable 80-100 psi... lol...

[4runnerchevy]

i wonder how hard it would be to find someone willing to fill that tank to 4000psi... also, how hard it would be to find a regulator that could regulate 4000psi to a more usable 80-100 psi... lol...

Scuba shops

[mastacox]

i wonder how hard it would be to find someone willing to fill that tank to 4000psi... also, how hard it would be to find a regulator that could regulate 4000psi to a more usable 80-100 psi... lol...

Yup, probably scuba shops. I <think> those might be small SCUBA tanks looking at them, but it's hard to say. No one would fill then without up-to-date hydro tests though.

Regulating would probably end up being a 2-stage setup like SCUBA uses, where the first stage regulates down to 10 Bar, and the second stage would regulate to what you're looking for.

[reggie 00]

Wow,
Nothing like a good crazy project to get the juices flowing.

I'll probably do just like stated use the valving on them. I was just planning on using them as small tanks. Nothing i have would need that much volume anyway. Will probably use both now to get a little extra volume. The two will probably be the same size as the big red tank that i originally had set aside.

Thanks for all the good ideas and points.

[waskillywabbit]

For the record I am not a pressure vessel inspector, I actually design pressure vessels (and a lot of other stuff) for an industrial fabricator per the ASME VIII Div 1 and 2 code.