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<br />IIISection 15.213 DESIGN AND CONSTRUCTION OF TANKS <br /> <br />Underground Tanks or Enclosed Tanks Inside of Buildings. <br /> <br />Tanks shall be designed and constructed to withstand <br /> <br />safely the service to which subjected. Corrosion <br />protection, where needed for the tank and its piping, <br /> <br />shall be provided by one or more of the following <br /> <br />methods: <br /> <br />"'(a) Protective coatings or wrappings, <br />... (b) Cathodic pr'otection, or <br /> <br />III (c) Corrosion resistant materials in the <br />construction of the tank and its piping. <br /> <br />NOTE: Selection of the type of protection <br /> <br />to be employed should be,based <br /> <br />upon the corrosion history of the <br /> <br />area and the judgment of a <br /> <br />'qualified erl'gineer. <br />-.'--- <br /> <br />Material other than steel, if used, shall be of <br /> <br />suitable durability and of thickness providing <br /> <br />equiValent strength to that provided by steel. <br /> <br />Steel commonly known as "mill seconds" shall not be <br /> <br />used. steel tanks shall be of a minimum gauge (U.S. <br /> <br />Standard) in accordance with Table 15.213. <br /> <br />'"'TABLE 15.21], <br /> <br />UNDERGROu~D AND ENCLOSED STORAGE Tk~S <br />Minimum Nominal Thickness of Material <br /> <br />Not Galvanized <br /> <br />Galvanized <br /> <br />Capacity <br />Gallons <br /> <br />u.S. Stand- - Pounds Per <br />ard Gauqe Sq. Ft. <br /> <br />U.s. Stand- <br />ard Gauqe <br /> <br />pounas Per <br />Sq. Ft.* <br /> <br />1 to 285 <br />286 to 560 <br />561 to 1,100 <br />1,101 to 4,000 <br />4,001 to 12,000 <br />12,001 to 20,000 <br />20,001 to 30,000 <br />30,001 to 50,000 <br /> <br />14 <br />12 <br />10 <br />7 <br />1/4 inch <br />5/16 inch <br />3/8 inch <br />1/2 inch <br /> <br />3.125 <br />4.375 <br />5.625 <br />7.50 <br />10.00 <br />12.50 <br />15.00 <br />20.00 <br /> <br />16 <br />14 <br />12 <br /> <br />2.50 <br />3.125 <br />4.375 <br /> <br />*Before Galvanizing <br /> <br />-20- <br />