need help on figuring out revetment

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I have to build a revetment to hold our 500 gallon used oil tank, By our standard it has to hold at least 250gals of it in case of tank rupture, I will be using 1 1/4x1/8 or 1 1/2 x 1/8 square tubing for the frame and then 1/16 or 1/8 sheet steel for the skin, all of it will be mig welded using aour millermatic 250x I will be cutting the sheet steel with a evolution metal saw, but I need to know how to figure out the size of the square revement that the round tank will sit in to holf what I need it to hol are there a formula for thisJon
Reply:231 Cubin inches per gallon if I remember correct.So231in x 250gal = 57750 cubic inches total. So make a frame that the L(in) x W(in) x H(in) is 57750 or greater and you will be fine. My quick calculations suggest a 9' x 9' x 5" pan would hold 252.468 so that would be enough.If you cannot convince them, confuse them.         Harry S Truman
Reply:It seems to me that to only hold 50% of the oil tank capacity is not a very satisfactory solution if the tank were to rupture, Is this a standard that covers the whole U.S.A. As far as I'm aware the bund (thats what it's called in the U.K.) must contain at least !00% of the tank capacity. And with our gallon being a little larger than yours there are 6.25 U.K.gallons in 1 Cubic foot,  Cheers  Gordon.Lincoln SP-170 MigHypertherm powermax 45Lorch T220 AC/DC TigButters FM 215 synergic MigKemppi 180 adaptive mig RULES ARE FOR THE OBEDIENCE OF FOOLS AND THE  GUIDANCE OF WISE MEN.
Reply:the way I read it is suppose to equalize once it fills up to the level of the hole in the tank, here is what I am building for it,  8' x 5' x 36" tall frame is made of 2"x1/8" aquare tubing then I am going to close the top in on it to keep it from being a trash canthanks for the help
Reply:If it has to hold 250 gal, don't forget to subtract the area of the original tank from the pan.So if the pan is 9'x9'x5' as listed earlier and hold's 250ish gals. it will hold less after you sit the original tank in there. You might have to double the pan size, so it might need to be closer to 11'x11'x5' or something like that..No government ever voluntarily reduces itself in size. Government programs, once launched, never disappear. Actually, a government bureau is the nearest thing to eternal life we'll ever see on this earth! Ronald Reagan
Reply:If it has to hold 250 gal, don't forget to subtract the area of the original tank from the pan.
Reply:I built some at work a few years ago.  I think they were about 8' by 12' with 24" sides.  I later built roofs for them because of the flying debris the shredder generated.  Don't forget to add a ball valve at the bottom for draining.  Rain water will collect, as well as snow.  In the event that you do have a leak, a hose can be attached to the ball valve and the enclosure pumped out.
Reply:Yep I have a 2" Pipe collar to weld on one end for a valve, plus I am going to enclose around the tank at a angle to keep trash out, But I will post pics once I start tomorrowJon
Reply:Originally Posted by SandyYou betcha. And the shape of the starting tank is going to play a huge role in those calculations. Big difference in a rectangular, round or oval tank and how big the containment needs to be. Even little things like; is there going to be an inch of space between the holding tank bottom and the con-tank?