Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Analysis Subarea: Original Author: Bentley Technical Support Group Comments Questions and Answers about Harmonic analysis in AutoPIPE Item #1: Harmonic analysis, AutoPIPE does not have cyclic type of stress so need to add a code case : do not need Sus +H1, create a new one with H1 by itself for the RPM of the harmonic from a rotation compressor. Combination method = 1 Sum, Category = Occasional, Case = H1. We can now set an allowable stress from Automatic because typical 1.33 *Sa but in this case because it is high cycle fatigue, the API618 mentions using a value of 26000 psi peak to peak so you can use half of that which is 13000 psi peak to peak or if you want to consider some SIF values typically would suggest using 13000/2 = 6500 psi for the Stress allowable. Therefore, 26000/2 for peak to peak /2 assuming a weld stress factor = 2 because the piping codes are typically based on SIF while fatigue values are typically based on stress concentration factors and there is a factor of 2 between SIF and stress concentration factors Item #2: AutoPIPE Compressor Vibration Method item #3: 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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