Applies To Product(s): AutoPIPE Version(s): 2004, XM, V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Date Logged & Current Version Jan 2015 09.06.01.10 Problem: I have in the past set up my own load combinations for the Hydrotest case - GR T3 P3 (Functional) and use the Hoop stress values for my reports. This gives me 118.54 MPa. For a change, I thought that I would give the default Hydrotest load case a try and but it gives me a different value of 148.17 MPa. Now when I just do a pure Hoop stress calculation (Pd/2t), it gives me another different result of 134.19 MPa. I am trying to understand why these 3 values are different Answer: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> ASME B31.8 Chapter VIII - 2010> for calculations used in AutoPIPE. pay special attention to the hoop stress calculation. In this case, the Hoop stress hand calculation use Dmean (PDmean/2t) and with the correct values for pressure factor in the Hydrotest load case so all stress values match now. 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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