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• <br />• <br />5.0 CERTIFIED INSPECTION (PERFORMED BY QUALIFIED TANK <br />INSPECTOR, AS DEFINED IN PARAGRAPH 3.2) <br />5.1 Every 10 years, or as determined in paragraph 6.0, inspect all tanks as <br />follows: <br />5.1.1 Perform all monthly, quarterly, and yearly inspections listed in <br />paragraphs 4.2 through 4.9 above. <br />5.1.2 Pressure test the tank for tightness. Consult tank manufacturer <br />installation instructions or the Steel Tank Institute Recommended <br />Practice R912-00, "Installation Instructions for Shop Fabricated <br />Stationary Aboveground Storage Tanks for Flammable, <br />Combustible Liquids. Air should not be used for a pressure test and <br />an inert gas should be used instead. The introduction of a gas <br />containing oxygen (such as air) to a tank which has previously held <br />a petroleum product can pose a explosion hazard. <br />5.2 Every 10 years, or as determined in paragraph 6.0, inspect single wall <br />horizontal, rectangular, or vertical tanks which are not in contact with the <br />ground (as defined in paragraph 2.8 above) in one of the following ways: <br />5.2.1 If the tank is equipped with a manway, either conduct ultrasonic <br />testing as described in paragraph 5.5 below, or visually examine <br />the interior of the tank as described in paragraph 5.6 below. <br />5.2.2 If the tank is not equipped with a manway, another inspection <br />method is necessary. Either use Method C-Invasive Permanently <br />Recorded Visual Inspection and Evaluation Including External <br />Corrosion Assessment" described in ASTM G 158, "Standard <br />Guide for Three Methods of Assessing Buried Steel Tanks" or use <br />ultrasonic testing to determine the wall thickness of the tank as <br />described in 5.5 below. <br />5.3 Every 10 years, or as determined in paragraph 6.0, inspect single wall <br />(horizontal, rectangular, or vertical) tanks which are in contact with the ground <br />(as defined in paragraph 2.8 above) in one of the following ways: <br />5.3.1 Inspect tanks which are constructed with a double bottom and <br />include a vacuum on the interstice the same as double wall tanks <br />(as described in paragraph 5.4 below). <br />5.3.2 If a cathodic protection system has been installed on the tank <br />bottom to protect the exterior of the tank bottom the following steps <br />shall be taken: <br />5.3.2.1 Examine the periodic readings which have been taken to <br />be sure that the cathodic protection remains adequate in <br />accordance with local, state, and federal guidelines. <br />These periodic readings shall have been performed by a <br />qualified cathodic protection tester. The criteria for <br />0 AST Inspection Standard 5 <br />September 2000