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<br />"'TABLE 15.213 <br /> <br />m~DERGROUND AND ENCLOSED STORAGE TANKS <br />Minimum Nominal Thickness of Material <br /> <br /> Not Galvanized Galvanized <br />Capacity U.S. Stand- Pounds Per U.S. Stand- Pounds Per <br />Gallons ard Gau~ Sq. Ft. ard Gauge Sq. Ft. * <br />1 to 285 14 3.125 16 2.50 <br />286 to 560 12 4.375 14 3.125 <br />561 to 1,100 10 5.625 12 4.375 <br />1,101 to 4,000 7 7.50 <br />4,001 to 12,000 1/4 inch 10.00 <br />12,001 to 20,000 5/16 inch 12.50 <br />20,001 to 30,000 3/8 inch 15.00 *Before Galvanizing <br />30,001 to 50,000 1/2 inch 20.00 <br /> <br />If adequate internal bracing is provided, tanks of 12,001 <br />to 30,000 gallons capacity may be built of 1/4 inch plate. <br />I <br /> <br />II 'Tanks larger than 50,000 gallons shall be built <br /> <br />.-...,~ <br /> <br />in accordance with National Recognized Engineering <br /> <br />Practice. Tanks (in this category) tested and listed <br /> <br />as underground storage tanks by a nationally recognized <br /> <br />testing agency may be considered as meeting the require- <br /> <br />ments of this section. Used tanks shall be approved <br /> <br />by the Chief prior to installation.' <br /> <br />"Section 12.19 <br /> <br />Section 15.215 of the Fire Code is <br /> <br />hereby amended to read as follows: <br /> <br />"'Section 15.215 <br /> <br />TANK CONNECTIONS FOR TANKS <br />UNDERGROUND OR IN BUILDINGS. <br /> <br />"'a. Vents. <br /> <br />'" (1) Location and Arrangement of Vents. <br /> <br />Vent pipes from tanks storing flanrrnable or combus- <br /> <br />tible liquids shall be so located that the discharge <br /> <br />point is outside of buildings, shall terminate not <br /> <br />less than,eight feet above the fill pipe opening <br /> <br />and not less than 12 feet above the adjacent ground <br /> <br />level. Vent pipes shall discharge only upward or <br /> <br />horizontally (not downward) in order to disperse <br /> <br />-17- <br /> <br />r <br />