(Tank Inspection, Repair, Alteration, and Reconstruction.) First published in 1991 by the American Petroleum Institute, API 653 is in its 5th edition. Considered to be the main code for the inspection, repair, alteration & reconstruction of above ground storage tanks outside of Europe, the document takes the form of a code rather than a guide (As EEMUA 159). The document is primarily to be used for the inspection of tanks constructed to API codes 650 or 620. Experience has shown API 653 to be the preferred document for repairs of above ground storage tanks.