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The experts at Equity Engineering Group discuss the application of API 579-1/ ASME FFS-1 Fitness-for-Service to aboveground storage tanks.

API 579-1/ASME FFS-1 Fitness-For-Service (API 579) is the go-to standard for assessment of fitness- for-service (FFS) of fixed equipment. Aboveground storage tanks (ASTs) designed to API 650 Welded Tanks for Oil Storage and API 620 Design and Construction of Large, Welded, Low- Pressure Storage Tanks are specifically included in the scope of API 579. The assessment procedures in API 579 may also be applied to pressure- containing equipment constructed to other recognised codes and standards, including international and internal corporate standards.


API 653 Tank Inspection, Repair, Alteration, and Reconstruction is the main in-service standard for ASTs. There are a few, limited FFS methodologies provided in API 653, primarily for shell thinning and pitting, and shell and bottom settlement. In situations ...

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