scope:

This recommended practice covers the inspection of atmospheric and low-pressure storage tanks that have been in service. This recommended practice describes the various types of storage tanks and the standards for their construction and maintenance. The reasons for inspection, causes of deterioration, frequency and methods of inspection, methods of repair, and preparation of records and reports are covered. Safe and efficient operation are emphasized. This recommended practice is intended to supplement API Standard 653, which provides minimum requirements for maintaining the integrity of storage tanks after they have been placed in service.