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<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 /> <br />'''Tanks larger than 50,000 gallons shall be built <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 section 15.215 of the Fire Code is <br /> <br />hereby amended to read as follows: <br /> <br />"'Section 15.215 TANK CO~TNECTIONS FOR TA}7KS <br />UNDERGROUND OR IN BUILDINGS. <br /> <br />"'a~ Vents. <br /> <br />III (l) Location and Arrangement of Vents. <br /> <br />Vent pipes from tanks storing flammable or com- <br /> <br />bustible liquids shall be so locat~d that the <br /> <br />discharge point is outside of buildings, shall <br /> <br />terminate not less than eight feet above the <br /> <br />fill pipe opening and not less than 12 feet above <br /> <br />the adjacent ground level. Vent ~ipes shall <br /> <br />discharge only upward or horizontally (not <br />downward) in order to disperse vapors. Vent <br /> <br />pipes two inches or less in nominal inside <br />diameter shall not be obstructed by devices <br /> <br />that will reduce their capacity and thus cause <br /> <br /> <br />excessive back pressure. Vent pipe outlets shall <br /> <br /> <br />be so located that flammable vapors will not enter <br /> <br />building openings or be trapped under eaves or <br />other obstructions. If the vent pipe is less than <br /> <br />ten feet in length or greater than two inches in <br /> <br />-21- <br />