How Convert volume to air gallons

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Could use a little help/confirmation. My deceased father left many garage items and one is an upright (on wheels) air cylinder. Pics tomorrow to follow. It measures approx 20 inches in diameter and 40 inches high. If my rough math is near correct that equates to about 12,500 cubic inches volume.What I am trying to do is estimate the air capacity in gallons. Just looking at my sears 25 gallon compressor, I am leaning towards 55 gallons or so of air capacity. Does that sound reasonable?Then, I wonder what air pressure to be safe. It seems similar to an old propane tank but somewhat stouter.  I expect it should be pressure tested. However, it seems far better than my sears 25 gallon. I am currently filling it to approx 75 psi, and the volume helps.The tank comes in handy, it has a handle welded to it and attached to the handle is a cup (piece of pipe) that fits nicely over a 2 inch ball when tilted forward and attached to lawn tractor or whatever.  Makes for a handy portable air tank.So, am I close at 50 to 55 gallons? I can sense the responses bout tank rupture, so we are prepared. Thanks folks..GeezerPower Mig 255C185 TIGBlue 175 MIGRanger 8 Kohler 20HP1974 5K Lincoln/Wisconsin Powered (Cherry)Victor/Harris O/AK 487 Spool Gun
Reply:Originally Posted by geezerCould use a little help/confirmation. My deceased father left many garage items and one is an upright (on wheels) air cylinder. Pics tomorrow to follow. It measures approx 20 inches in diameter and 40 inches high. If my rough math is near correct that equates to about 12,500 cubic inches volume.What I am trying to do is estimate the air capacity in gallons. Just looking at my sears 25 gallon compressor, I am leaning towards 55 gallons or so of air capacity. Does that sound reasonable?Then, I wonder what air pressure to be safe. It seems similar to an old propane tank but somewhat stouter.  I expect it should be pressure tested. However, it seems far better than my sears 25 gallon. I am currently filling it to approx 75 psi, and the volume helps.The tank comes in handy, it has a handle welded to it and attached to the handle is a cup (piece of pipe) that fits nicely over a 2 inch ball when tilted forward and attached to lawn tractor or whatever.  Makes for a handy portable air tank.So, am I close at 50 to 55 gallons? I can sense the responses bout tank rupture, so we are prepared. Thanks folks..
Reply:I believe tackit... or maybe it was someone else??? had a thread on hydrotesting your own tanks here somewhere   that way you could at least 'proof' test your tank and make sure it has a relief valve on it for somewhere below where you test to
Reply:[QUOTE=ronsii;8781571]Well... since there are aprx. 7.48 gallons in a cubic foot..... and you have a cylinder with 12,566+ cubic inches in it... seems easy enough 12,566 / 1728 = 7.2719 (FT3)7.2719 X 7.48 = 54.39 (GAL)[/QUOT7.48 for dry calculations. You are correct sir, should have figured that myself. Anyhow, my Kentucky windage was on target.GeezerPower Mig 255C185 TIGBlue 175 MIGRanger 8 Kohler 20HP1974 5K Lincoln/Wisconsin Powered (Cherry)Victor/Harris O/AK 487 Spool Gun
Reply:Oh, here's tackit's thread on the DIY hydrotest...  https://weldingweb.com/vbb/showthrea...te-of-at-tank/
Reply:Much obliged sirGeezerPower Mig 255C185 TIGBlue 175 MIGRanger 8 Kohler 20HP1974 5K Lincoln/Wisconsin Powered (Cherry)Victor/Harris O/AK 487 Spool Gun
Reply:Originally Posted by geezerMuch obliged sir
Reply:geezer Originally Posted by geezer . . . I can sense the responses bout tank rupture, so we are prepared . . .
Reply:It is 231 cubic inches to 1 gallon It is what for a long time and hand calculator But today I use a app Faster too and most convention See athttps://play.google.com/store/apps/details?id=kr.sira.unitDave Originally Posted by geezerCould use a little help/confirmation. My deceased father left many garage items and one is an upright (on wheels) air cylinder. Pics tomorrow to follow. It measures approx 20 inches in diameter and 40 inches high. If my rough math is near correct that equates to about 12,500 cubic inches volume.What I am trying to do is estimate the air capacity in gallons. Just looking at my sears 25 gallon compressor, I am leaning towards 55 gallons or so of air capacity. Does that sound reasonable?Then, I wonder what air pressure to be safe. It seems similar to an old propane tank but somewhat stouter.  I expect it should be pressure tested. However, it seems far better than my sears 25 gallon. I am currently filling it to approx 75 psi, and the volume helps.The tank comes in handy, it has a handle welded to it and attached to the handle is a cup (piece of pipe) that fits nicely over a 2 inch ball when tilted forward and attached to lawn tractor or whatever.  Makes for a handy portable air tank.So, am I close at 50 to 55 gallons? I can sense the responses bout tank rupture, so we are prepared. Thanks folks..
Reply:Originally Posted by OPUS FERROgeezerYour post - sound like you are trying to kill the entire neighborhood - what, is the end use, of your Manhattan Project - reverse engineering . . . hthOpus.
Reply:For high-pressure cylinders, they put the tank into another tank filled with water, and then even if it blows, it blows up vertically and not horizontally. The reason there is real concern about quickly filing a tank is that heat is generated when you condense any gas. The heat from condensation can cause, metal to glow red almost instantly. Over the years when starting up large rack systems with large compressors, I have seen a large metal vessel the condenser that was supposed to be water-cooled but was not getting water, heat to emit radiant heat in three seconds. The tank weighs several hundred pounds and it just starting radiating heat in a couple of seconds. If you have ever seen melted reeds in a compressor head you know the power of condensation. That is the danger of draining propane tanks too quickly. You can have nearly zero pressure over the liquid propane. I have heard where an icy tank was dropped or warmed and it detonated. Never did much testing but the information seemed sound and came from some pretty rugged boys. Sincerely, William McCormickIf I wasn't so.....crazy, I wouldn't try to act normal, and you would be afraid.
Reply:Originally Posted by William McCormickFor high-pressure cylinders, they put the tank into another tank filled with water, and then even if it blows, it blows up vertically and not horizontally. The reason there is real concern about quickly filing a tank is that heat is generated when you condense any gas. The heat from condensation can cause, metal to glow red almost instantly. Over the years when starting up large rack systems with large compressors, I have seen a large metal vessel the condenser that was supposed to be water-cooled but was not getting water, heat to emit radiant heat in three seconds. The tank weighs several hundred pounds and it just starting radiating heat in a couple of seconds. If you have ever seen melted reeds in a compressor head you know the power of condensation. That is the danger of draining propane tanks too quickly. You can have nearly zero pressure over the liquid propane. I have heard where an icy tank was dropped or warmed and it detonated. Never did much testing but the information seemed sound and came from some pretty rugged boys. Sincerely, William McCormick
Reply:I think William needs to brush up on the definitions of "condense" and "compress".Ol' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:Here is a couple shots of the beast, crude but works. GeezerPower Mig 255C185 TIGBlue 175 MIGRanger 8 Kohler 20HP1974 5K Lincoln/Wisconsin Powered (Cherry)Victor/Harris O/AK 487 Spool Gun
Reply:I blew it, did not turn my phone sideways.  Last edited by geezer; 11-28-2020 at 05:08 PM.GeezerPower Mig 255C185 TIGBlue 175 MIGRanger 8 Kohler 20HP1974 5K Lincoln/Wisconsin Powered (Cherry)Victor/Harris O/AK 487 Spool Gun
Reply:By the looks of the welds on that I'd haul it to the scrap yard. That weld along the side scares me to look at it.Ol' Stonebreaker  "Experience is the name everyone gives to their mistakes"Hobart G-213 portableMiller 175 migMiller thunderbolt ac/dc stick Victor O/A setupMakita chop saw
Reply:I'm going with nope.That one needs to be retired and made into a cooker of some sort Dave J.Beware of false knowledge; it is more dangerous than ignorance. ~George Bernard Shaw~ Syncro 350Invertec v250-sThermal Arc 161 and 300MM210DialarcTried being normal once, didn't take....I think it was a Tuesday.
Reply:Originally Posted by mla2ofusBy the looks of the welds on that I'd haul it to the scrap yard. That weld along the side scares me to look at it.
Reply:Originally Posted by MinnesotaDaveI'm going with nope.That one needs to be retired and made into a cooker of some sort
Reply:Originally Posted by mla2ofusI think William needs to brush up on the definitions of "condense" and "compress".
Reply:Hey, try this formula to calculate air galloons that you need:L x W x D. = Cubic Feet.Cubic ft x 7.47 = Gallons.
Reply:When filling high pressure cylinders taking temperature's is part of the process. They can get quite hot and you have to compensate for it. Acetylene cylinders are cooled with water when filling and take several hours to fill. I wouldn't trust the tank in question.
Reply:Originally Posted by ronsiiWell... since there are aprx. 7.48 gallons in a cubic foot..... and you have a cylinder with 12,566+ cubic inches in it... seems easy enough 12,566 / 1728 = 7.2719 (FT3)7.2719 X 7.48 = 54.39 (GAL)
Reply:Originally Posted by BarclayHey, try this formula to calculate air galloons that you need:L x W x D. = Cubic Feet.Cubic ft x 7.47 = Gallons.
Reply:Originally Posted by mla2ofusNever seen a pressure vessel measured in length x width x depth. Maybe  area of dia. x length + volume of sphere ( 2 ends combined).That looks like a pressure pot for a sand blasting set up.Is that a flat plate on the bottom?Sent from my SM-G960U using Tapatalk
Reply:It looks a way too much like the old water tanks farmers used to convert to air and blow themselves up with. I wouldn't pressurize that at any level.250 amp Miller DialArc AC/DC StickF-225 amp Forney AC Stick230 amp Sears AC StickLincoln 180C MIGVictor Medalist 350 O/ACut 50 PlasmaLes
Reply:Originally Posted by Country MetalsThat looks like a pressure pot for a sand blasting set up.Is that a flat plate on the bottom?Sent from my SM-G960U using Tapatalk