Per 49 CFR 180.352 (f), the owner or lessee of an IBC must keep records of periodic retests, initial and periodic inspections, and tests performed on the IBC if it has been repaired. Records must include tank design type and packaging specification, test and inspection date, name and address of test and inspection facility, name(s) of any persons conducting test or inspection, and test or inspection specifics and results. Records must be kept for each packaging specification at each location where periodic tests are conducted until such tests are successfully performed again or for at least 2 1/2 years from the date of the last test. These records must be made available for inspection by a representative of the Department of Transportation upon request. IBCs not conforming to the external inspection, internal inspection, pressure, or the thickness tests must be removed from hazardous materials transportation until restored to the original design type.
Per 49 CFR 173.32 (e) (3), the date of the most recent periodic retest must be marked on the tanks, on or near the metal certification plate.