Have to turn a 500 gallon fuel tank to water tank

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Tanks been sitting for a couple of years now. I have welded on fuel tanks before, but not this big. Dry ice work on somthing this big? I have stuck my nose in there, i feel allright about it, but just want a fool proff way of welding on this tank.  Any ideas
Reply:Flush with soapy water. After a few years, nothing is left but the varnish.And then, after so much work...... you have it in your hand, and you look over to your side...... and the runner has run off. Leaving you holding the prize, wondering when the runner will return.
Reply:what all do you have to do in order to finish the job? are there any holes that you can cut in there to allow it to air out? if you can, i would cut a hole in one end/side, then another hole in the other... set a fan to blow fresh air into the hole for a day or so... just to make sure that all the fumes are out. if you want to spend the money on the dry-ice, it would probably be a good idea. just make sure that the tank is sealed up to the point of the weld (CO2 falls). use duct tape to seal any pinholes until you can weld them.Later,Andy
Reply:You're going to turn it into a water tank anyway, right?  Why not just fill 'er full of water before welding, cutting etc?Contact me for any metal polishing needs you may have, my avatar is a pic of a standard, painted fire axe that I ground, sanded polished and buffed to a mirror finish.
Reply:This question is for aczeller (and I'm trying to be politically correct here).What training/qualifications do you have to be giving advice/guidance on cutting a fuel tank? No one asked what type fuel the tank had been used to store.  Depending on the type of fuel, it could, even after sitting empty for several years, still explode if not handled properly.Syncro 250 DX Dynasty 200 DXMM 251 w/30A SG XMT 304 w/714 Feeder & Optima PulserHH187Dialarc 250 AC/DCHypertherm PM 1250Smith, Harris, Victor O/ASmith and Thermco Gas MixersAccess to a full fab shop with CNC Plasma, Water Jet, etc.
Reply:Was it a gasoline tank or a diesel?  I have personally seen the injuries from even small old tanks that once held gasoline.  I once would have tackled a gas tank, but now I will not.  Not that they can't be done safely...I just don't want to risk a mistake...Diesel is much less dangerous.  But, you should do a search of threads that have addressed this question.  There are several.Smithboy...if it ain't broke, you ain't tryin'.
Reply:Originally Posted by txfireguy2003You're going to turn it into a water tank anyway, right?  Why not just fill 'er full of water before welding, cutting etc?
Reply:Originally Posted by smithboyWas it a gasoline tank or a diesel?  I have personally seen the injuries from even small old tanks that once held gasoline.  I once would have tackled a gas tank, but now I will not.  Not that they can't be done safely...I just don't want to risk a mistake...Diesel is much less dangerous.  But, you should do a search of threads that have addressed this question.  There are several.