Determine remaining welding gas in cylinder

[Tractorguy24]

Is it possible to determine how much c25 gas I have left in my 330 cu ft.cylinder? Is there a formula or some rule of thumb? It is at 200psi right now.
Thanks!

 

[yomax4]

Not that I'm aware of. Being it's dispensed by the CFH and everyone runs a little different flow. From being in the same boat a few times I'd guess you have a half hour left. 330 cf in the tank when new can be calculated to how many trigger pull hours the tank will last if you had kept track. Who does that? Time to buy.

 

[tomplum]

My current gauge set up will run them down to zero and out. Strangely accurate. Not all do though. It's time to be thinking about project needs and getting gas though. I wish I could have a 330.

 

[CobyRupert]

"Ideally" the formula is PV=nRT.

...but can you weigh it, though you'd need to know the full and empty weight?

 

[CincyFlyer]

Is it possible to determine how much c25 gas I have left in my 330 cu ft.cylinder? Is there a formula or some rule of thumb? It is at 200psi right now.
Thanks!

Without any fancy formulas, if you started out at 3000 psi at room temperature, and it now reads 200 psi at room temperature, you now have 1/15th the gas. 1/15th of 330 is 22 cubic feet.

 

[4570Man]

Without any fancy formulas, if you started out at 3000 psi at room temperature, and it now reads 200 psi at room temperature, you now have 1/15th the gas. 1/15th of 330 is 22 cubic feet.

I don’t think it’s that easy. I think doubling the pressure wouldn’t double the gas volume.

 

[CincyFlyer]

I don’t think it’s that easy. I think doubling the pressure wouldn’t double the gas volume.

Do you think that doubling the gas volume would double the pressure? In a fixed-size cylinder, of course.

 

[Todd727]

Not that I'm aware of. Being it's dispensed by the CFH and everyone runs a little different flow. From being in the same boat a few times I'd guess you have a half hour left. 330 cf in the tank when new can be calculated to how many trigger pull hours the tank will last if you had kept track. Who does that? Time to buy.

I don’t think it’s that easy. I think doubling the pressure wouldn’t double the gas volume.

All that useless math that people say they are never going to use again.... SMH

 

[4570Man]

Do you think that doubling the gas volume would double the pressure? In a fixed-size cylinder, of course.

I don’t know. But I really doubt it’s that straight forward.

 

[yomax4]

Without any fancy formulas, if you started out at 3000 psi at room temperature, and it now reads 200 psi at room temperature, you now have 1/15th the gas. 1/15th of 330 is 22 cubic feet.

It's about that easy. You will get flow right down to the last psi. I was pretty close guessing 1/2 hr of trigger pull left. I was using 25cfh as a guideline.