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Industry Standard Requirements for Tank Inspection Frequency (cont.) <br /> In Table 5.5 use the following designations: <br /> P-Periodic AST inspection E-Formal External Inspection by Certified Inspector <br /> L-Leak test by owner's designee I-Formal Internal Inspection by Certified Inspector <br /> ()indicates maximum inspection interval in years.For example;E(5) indicates formal external inspection every 5 years. <br /> SP001 Table 5.5:Inspection Schedules ConVault <br /> Shop Fabricated AST Size(Us Gations) Category 1 Category 2 Category 3 <br /> 0-1100 <br /> (0-Al64liters) P P P,E&L(10) <br /> Shop 1,101 -5,000 P,E&L(5),.I(10) <br /> Fabricated <br /> ASTs (4,168-18,927 liters) P P,E&L(10) P L(2or <br /> ),E(5) <br /> 5,001 -30,000 P,E(10),t(20) p E&L(5),l(10) <br /> 08,931 -113,562 liters) P,E(20) p E(S),L(10) P,E&L(5),E(5) <br /> 30,001 -50,000 P,E(20) P,E&L(5),t(15) P,E&L(5),l It 5) <br /> Portable Containers P p I P* <br /> *Owners shall either discontinue use ofportable container forstorage or have the portable container DOT <br /> (Department of Transportation)tested and recertified per following schedule(refer to Section 9.0): <br /> Plastic containers-every 7years,-steelportablecontainer-every 12years <br /> Stainless Steel container-every 17 years <br />