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B5.1 The lining shall be visually inspected for evidence B7.3 SURFACE PREPARATION <br /> of peeling, blistering, surface wrinkling or roughing of the <br /> lining material. Imperfections in the lining shall be B7.3.1 After the tank has been emptied, the interior tank <br /> repaired in accordance with the lining material surfaces shall be cleaned as required for the use of the <br /> manufacturer's specifications. ultrasonic thickness gauging equipment. All thickness <br /> gauge testing shall be performed through the lining <br /> material. <br /> B6.0 TESTING OF THE LINING <br /> B6.1 After completion of section B5.1 of this chapter, the B7.4 ORIGINAL TANK METAL THICKNESS <br /> lining material shall meet the thickness, hardness, and the <br /> holiday testing requirements of Chapter A of sections B7.4.1 Original tank metal thickness shall be established <br /> A13.0. in accordance with either B7.4.1.1 or B7.4.1.2 below. <br /> Note: Chapter A of this standard specifies minimum B7.4.1.1 Original tank metal thickness shall be based on <br /> lining thickness requirements. A 125 mil lining provides the original tank metal thickness as listed below by the <br /> additional structural strength to the tank walls by forming tank capacity and diameter. <br /> a composite tank. A 125 mil thick lining is required to Capacity Diam. Original <br /> extend the operational life of the tank. A 125 mil lining <br /> will provide a solid structural barrier over future holes due Thickness <br /> to external corrosion in the outer steel tank wall. U.S.gallons Inches Inches <br /> Up to 285 42 0.067 <br /> 286 to 560 48 0.093 <br /> B7.0 ULTRASONIC TESTING 561 to 1100 64 0.123 <br /> 1101 to 4000 84 0.167 <br /> B7.1 INSPECTOR QUALIFICATION 4001 to 12000 126 0.240 <br /> 12001 to 20000 144 0.302 <br /> A special inspector or a qualified person shall perform 20001 to 50000 144 0.365 <br /> ultrasonic inspection. <br /> Note: The above tank metal thickness is the metal <br /> B7.2 GAUGING EQUIPMENT CAPABILITIES thickness requirements specified in UL- 58,table 3.1 and <br /> section 3.6. <br /> B7.2.1 The thickness gauging equipment shall be capable <br /> of determining the thickness of the tank metal through B7.4.1.2 The original tank metal thickness shall be <br /> the lining material. obtained from the tank manufacturer. <br /> B7.2.2 The thickness gauging equipment shall have an <br /> accuracy of+/-0.05mm.and a resolution of+/-0.05mm. B7.5 ULTRASONIC THICKNESS GAUGING <br /> PROCEDURE <br /> B7.2.3 Ultrasonic testing equipment shall be maintained B7.5.1 The interior tank surface shall be divided into in <br /> 45 <br />