API 653 Tank Inspection: What Industry Professionals Must Know
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An API 653 Tank is an aboveground storage tank (AST) that is inspected, maintained, repaired, altered, or reconstructed in accordance with API Standard 653, developed by the American Petroleum Institute.

API 653 Tank Inspection: What Industry Professionals Must Know
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API 653 Tank Inspection: What Industry Professionals Must Know

Alterations under API 653 refer to any changes made to an existing storage tank that affect its original design, configuration, or operating conditions.