Revision addresses new approaches for storage tank loads

The American Petroleum Institute (API) Standard 650, Welded Steel Tanks for Oil Storage, provides design rules for petroleum storage tanks. These rules are intended to provide reasonable margins against failure of these tanks due to loads imposed on them. The loads include such environmental loads as snow, wind, and earthquakes, and those due to use of the tanks, such as roof live loads, internal and external pressure, and liquid in the tanks.Through its 10th Edition (1998), API 650 addressed loads simplistically. For example, API 650 prescribed a 25-psf live load for all fixed roofs (unconservative for some northern locations) and provided no method to determine snow loads.Wind loads wer...

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