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• Corrosion allowances and corrosion rates. <br />• Conditions at previous inspecf:ons. <br />• The methods and materials of construction and repair. <br />• The location of tanks. <br />• The potential risk of air or water pollution. <br />• Leak detection systems. <br />• Change in operating mode. <br />• Jurisdictional requirements. <br />Jurisdictional regulations, in some cases, conirol the frequency and interval of the <br />inspections. These regulations may include vapor foss requirements, seal condition, <br />feakage, proper diking, and repair procedures. Knowledge of such regulations is <br />necessary to insure compliance with schedufing and inspection requirements. <br />External inspections are delineated in two subparts: Routine In-Service Inspections and <br />Schedufed Inspections. Routine tnspections may be performed by owner/operator <br />personnel and shall noi exeeed one month. Scheduled Inspections are to be <br />performed by a quali�ied inspector at least every five years, or at the quarter corrosion <br />rate of the shell. <br />Internal (tank} inspections are required primarily to: <br />Ensure that the bottom is not severeiy corroded and leaking. <br />Gather the data necessary, for the minimum bottom and shell thickness <br />assessments detaifed in Section 2_ As applicable, this data shall also <br />take into ac�ount external ultrasonic ihickness measurements made <br />during in-service inspections. <br />Identify and evaEuate any tank bottom settfement. <br />lntervals for internal tank inspections are to be determined by the corrosion rates <br />measured during previous inspections or based on experience with similar in service <br />tanks. In no case shall the intemal inspection interval exceed 20 years. Alternative <br />Inspection Intervals are also permitted. <br />Inspection checklists are detailed in the Appendix. The standard requires that the <br />owner/operator maintain a complete record file for three types of records covering <br />constructian, inspection history, and repair/alteration history. Records may not exist for <br />older tanks_ <br />Applicabfe Fire Codes <br />Prior to 1989, the National Fire Protection Association Code 30 for Flammab{e and <br />Combustible Liquids was in efiect for the design, construction and installation of <br />5-3 <br />