Based on these gages Should I refill tank.

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Howdy everyone,I was doing a little touch up welding tonight and have recently purchased one of those really small gas tanks with  75/25 mixture. I was looking at the gauges on the tank and this is what they look like: . The argon gauge is where I need it but the other looks a littl low. Does this mean the tank is about empty? What do U think? Here is the size of my tank, what is the actual size called?Thanks everyone.Weld-Pak 100 Mig. New to welding and melting anything metal
Reply:if im looking at that right, you have 1k psi in the tank, and an output pressure of about 26 l/min (?) now im not sure how fast its used as i dont understand the output measurement. with 1k left i think that means that you have used about 2/3 of the tank so far (since the red line is just over 3k). id run it dry just to see how long it takes so you know in the future, id hate to find out later that i was infact refilling after only about 2/3 use. could always ask when you get it filled how long it should last.as for the size of the tank, it looks like the one i just bought last week. which was around 45cf. and after an afternoon of welding a trailor at work its now around 2.5kwish i could help more
Reply:Run 'er till you run out of shielding gas if you want. If you want to be in a little more control of when, run the high side down as close to zero as possible at some convenient quitting point but you still show 20 or so cfh on the flow side. There will still be some pressure in there when you take it in. There's is this old rule of thumb that says "leave a hundred pounds" in any tank but that is for idiot proofing returns. If followed that would prevent some dork from opening a valve and leaving it open. By leaving a vlave open a tank could set there and breath in and out and acquire moisture, or in acetylene wick away the acetone. BTW, you could run down around 18 to 20 cfh. You new that prolly tho.
Reply:How does "L/Min" convert to "CFM"?
Reply:Liters per/min to cu ft per/min is:LPM x 0.035310 LPM x 0.0353 = .353 cu ft per/min.Please remember tho that in GMAW an average shielding flow is stated as or given as Cubic Feet per/Hour (CFH). To get our CFH from the above just multiply by 60 (min per hr)..353 cu ft per/min x 60 = 21.18 CFH or you can say that 10 liters per/min equals 21.18 cuic feet per/hour (CFH). Another way to get from liters per/min to cu ft per/hr would be LPM x 2.118 = CFH. 10 LPM x 2.118 = 21.18 CFH.Sound right? Check the math to make sure.