New load combination approach brings API 650 into line with ASCE 7

UPDATING API 650— ConclusionAmerican Petroleum Institute's pressure vessel and tank committee recently concluded a 5-year effort to revise Standard 650 that provides design rules for reasonable margins against failure of petroleum storage tanks due to loads imposed on them.Results of this effort will be included in the latest (11th) edition of API 650, which the committee expects to be published in 2005. This second of two articles on those revisions addresses new load combinations; Part 1 (OGJ, Dec. 8, 2003, p. 58) addressed the individual loads.Before the revisions, API 650 was reasonably successful in providing both safe and cost-effective tank designs, but it was right often...

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