An API Special Task Group was formed to develop the appendix.Thus in late 1998, the Task Group began work on the appendix.Fortunately, work on external pressure design of tanks that DuPont had already compiled andimplemented in an internal engineering standard was made available to the Task Group with DuPont’spermission. What will a typical tanksubject to a significant vacuum design pressure look like?Guidance for cases where tanks are subject to flooding of the dike area surrounding the tank.Background:The request that API 650 include design rules for tanks with external pressure originated with theProcess Industry Practices (PIP) group, a consortium of numerous petroleum and chemical companies.In response to PIP’s request, API agreed to develop the requested rules and incorporate them in anTank Industry Consultants1Īppendix to API Standard 650. Whatcomponents are included?A design example to illustrate application of the design procedures. How is external pressurecombined with roof live load and wind load, e.g.?The equations and formulas that are provided for the design of tank components. Where do the rules come from?The loading conditions and combinations addressed by the appendix. Why and how did it come about?The scope of the document as defined by the Process Industry Practices group.The technical basis of the appendix.
Lieb, P.E.Tank Industry ConsultantsNovember, 2003Introduction:In the near future, API will publish an appendix to API 650 that will prescribe requirements for thedesign of tanks that operate at negative pressure (or vacuum).This paper discusses:The background on the development of the new appendix.
API 650 EXTERNAL PRESSURE DESIGN APPENDIXJohn M.
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