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Chapter 7: Inspection, Evaluation,and Testing_ 7.7.4 API Recommended Practice 575 - Guidelines and Methods for Inspection of Existing Atmospheric and Low-Pressure Storage Tanks API Recommended Practice 575—Guidelines and Methods for Inspection of Existing Atmospheric and Low-Pressure Storage Tanks 157(API RP 575),which supplements API 653, covers the inspection of atmospheric tanks(e.g., cone roof and floating roof tanks) and low-pressure storage tanks (i.e.,those that have cylindrical shells and cone or dome roofs)that have been designed to operate at pressures from atmospheric to 15 pounds per square inch gauge (psig). (API RP 572158 covers vessels operating above 15 psig.)API RP 575 applies only to the inspection of atmospheric and low-pressure storage tanks that have been in service. In addition to describing the types of storage tanks and their construction and maintenance,API RP 575 also covers the reasons for inspection, causes of deterioration,frequency and methods of inspection, methods of repair, and the preparation of records and reports. The recommended practice is organized as follows: • Section 1 of API RP 575 introduces the recommended practice and details its scope. • Section 2 lists codes, standards and related publications that are cited in the recommended practice. • Section 3 defines terms relevant to API RP 575. • Section 4 describes specific types of atmospheric and low-pressure storage tanks including construction materials and design standards and their use. • Section 5 covers the reasons for inspection and causes of deterioration of both steel and non- steel storage tanks. Section 5 also covers the deterioration and failure of auxiliary equipment as well as a similar service methodology for establishing tank corrosion rates. • Section 6 of API RP 575 addresses inspection frequency and scheduling; it mainly defers to the inspection frequency requirements described in API 653 and API RP 12111. • Section 7 covers the methods of inspection including the external inspection of both in-service and out-of-service tanks and the internal inspection of out-of-service tanks. • Section 8 addresses leak testing and hydraulic integrity of tank bottoms. • Section 9 focuses on the integrity of repairs and alterations,which stresses the importance of inspecting repairs to ensure they have been properly done. 157 API RP 575,"Guidelines and Methods for Inspection of Existing Atmospheric and Low-Pressure Storage Tanks,"2nd ed., American Petroleum Institute,May,2005 iss API 572 Inspection of Pressure Vessels,3rd Edition,November,2009 SPCC GUIDANCE FOR REGIONAL INSPECTORS 7-67 December 16, 2013