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classification; applicable jurisdictional requirements; and the judgment of the inspector, the piping engineer, the piping engineer supervisor, or a corrosion specialist. Table 2 of API 570 provides maximum inspection intervals for piping based on piping service classification: — Class 1 poses the highest potential of resulting in an immediate emergency if a leak were to occur; — Class 2 is for services not included in other categories and includes the majority of piping; — Class 3 is for services that are flammable but do not significantly vaporize when they leak and are not located in high-activity areas; and — Class 4 is for services that are essentially nonflammable and nontoxic. The maximum inspection interval for in-service aboveground piping listed in Section 6 Table 2 is as follows: — Class 1:Thickness measurements—5 years,visual inspection—5 years — Class 2:Thickness measurements—10 years,visual inspection—5 years — Class 3:Thickness measurements—10 years,visual inspection—10 years — Class 4:Thickness measurements—optional,visual inspection—optional The inspection interval may be less depending on corrosion rates and remaining life. Thickness measurements must be obtained at%2 the remaining life determined from corrosion rates or the intervals listed in Table 2 whichever is less. The type and frequency of inspections for buried piping is presented separately in Section 9 (see below). • Section 7 addresses data evaluation, analysis, and recording. The owner/operator should maintain permanent records for all piping systems covered by API 570. • Section 8 provides guidelines for repairing, altering, and rerating piping systems and refers to ASME B31.3 for in-service repairs. • Section 9 addresses the inspection of buried piping. Inspecting buried process piping is different from inspecting other process piping because the inspection is hindered by the inaccessibility of the affected areas of the piping. • Annex A, B, and C address inspector certification, requests for interpretations, examples of repairs, and the external inspection checklist for process piping, respectively. SPCC GUIDANCE FOR REGIONAL INSPECTORS 7-70 December 16, 2013