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CHAPTER A <br /> UPGRADING OF STEEL TANKS BY LINING AND REPAIRS <br /> A1.0 SCOPE TANKS FOR CATHODIC PROTECTION <br /> RETROFIT WITHOUT LINING IN <br /> Al.l Chapter A applies to tank lining upgrades ACCORDANCE WITH 40 CFR PART <br /> and repairs of existing underground steel tanks 280.21(B)(2)(I) SEE CHAPTER C OF NLPA <br /> in accordance with the Code of Federal 631. IT IS RECOMMENDED THAT TANKS <br /> Regulations 40 CFR Parts 280.21 (b)(1)(i), BE LINED PRIOR TO RETROFIT WITH <br /> 280.33 (a), and 280.33 (d)(1) which includes CATHODIC PROTECTION TO AVOID <br /> opening, inspecting, repairing, lining, closing of FUTURE RELEASES. <br /> access openings,and testing. <br /> A2.0 DEFINITIONS <br /> A1.2 This chapter specifies structural A2.1 BLANKED OFF - The sealing, capping, <br /> assessment criteria based upon the number of or plugging of lines. <br /> perforations and tank age. The operational life <br /> of bare steel tanks that are assessed and lined in <br /> accordance with Chapter A of this standard A2.2 CLASS 1, DIVISION 1, GROUP D <br /> may be extended at least 10 years without the EQUIPMENT - Electrical equipment that is <br /> addition of cathodic protection. explosion proof. <br /> A23 COMBUSTIBLE LIQUID - Any liquid <br /> A1.3 In general, it prescribes the lining having a flash point at or above 100 degrees <br /> requirements for the prevention of leaks and fahrenheit. <br /> spills from steel tanks in the future due to <br /> external or internal corrosion without requiring A2.4 FLAMMABLE LIQUID - Any liquid <br /> the addition of cathodic protection. having a flash point below 100 degrees <br /> fahrenheit having a vapor pressure not <br /> A1.4 This chapter specifies a structural lining exceeding 40 pounds per square inch (absolute) <br /> for the steel tank wall. The lining provides at 100 degrees fahrenheit. <br /> structural strength to the tank walls by forming a <br /> composite tank. A minimum thickness of the A2.5 FLAMMABLE LIMITS <br /> lining material is specified to provide a solid <br /> structural barrier that will bridge any future <br /> holes in the outer steel tank wall due to external A2.5.1 LOWER FLAMMABLE LIMIT - The <br /> corrosion. <br /> minimum concentration of a flammable vapor <br /> in air or oxygen that will ignite if an ignition <br /> NOTE: FOR INTERNAL INSPECTION OF source is applied. <br /> EXISTING STEEL UNDERGROUND <br /> 6 <br />