Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Calculation Subarea: Original Author: Bentley Technical Support Group Comments, Questions, and Answers with SIF calculations in AutoPIPE Item #1: The program does not seem to be using the correct SIF for an elbow, why? Answer : The SIF may not have been the highest SIF at that node location. Please review your model input listing report for exactly what SIF values are entered at the node points and output report for values being used for the calculation. There may have been an override, see AutoPIPE online help for Insert/Modify XtraData> Joint Type and User SIF> "Override all other SIFs at this point". Item #2: In a model where the pipe and elbow have a different pipe ID that includes different wall thickness. As shown below: The SIF and stress were calculated to: In an effort to reduce the code stress on the elbow, a 2.34 user SIF with override SIF option enabled was added to the elbow: However now the stress are calculated as: how is it possible to apply the user SIFs(2.34 only to override SIF=2.92) in AutoPipe models for bends without affecting the default SIF(1.00) value at A15N- and A15+? Answer: This a limitation of the programs ability to apply the user SIF to the node point. Currently, AutoPIPE V8i 09.06.xx.xx and lower applies the user SIF to both the +ve and -ve side of a node point. A new enhancement ( TFS-E79346 : Add option to apply an SIF to one or both sides of a node point) has been logged to apply the USER SIF value a specific side / face (i.e. +ve and /or -ve) of a node point . Item #3: when I look at the component data listing for an elbow the SIF are: COMPONENT DATA (Bend, TIP= B03, Near= B03 N, Far= B03 F): Long Elbow, Radius= 3.000 inch, Bend angle= 90.00 deg, End flanges= 1, Flex= Auto, SIFI= 1.47, SIFO= 1.23 However, when I review the Bend Data listing report sub section, the SIF values are: Why are the SIF values different for the same elbow ? Answer: The calculated SIF is affected by the pressure case setting used in the Load> Static Analysis set. In the above example, see that Pressure Case = P1. If Pressure Case = None the SIF values would match exactly with the value in the Component Data Listing sub-report as indicated below: See Also Bentley AutoPIPE External Links Bentley Technical Support KnowledgeBase Bentley LEARN Server Comments or Corrections? Bentley's Technical Support Group requests that you please submit any comments you have on this Wiki article to the "Comments" area below. THANK YOU!
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