Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Output Subarea: Original Author: Bentley Technical Support Group Item #1: The program incorrect compute MAWP(20C, new), MAP(20C, new)for cladding. The calculation of the Heat Exchanger, the program does not allow the adaption for clad bottom plate of corrosion allowance 0mm. I can not change the the corrosion allowance for clad bottom plate. Answer: The clad thickness is always considered like a corrosion allowance in AutoPIPE Vessel. To resume, if you input 1 mm of cladding, that is exactly the same thing as if you input 1mm of corrosion allowance. Item #2: In the calculation report for a double stacked heat-exchanger with the Pressure vessel design code set to ASME VIII DIV.1, saddle No 1 (top) |Mzz| = RaH . H, and was verified by my hand calculations. However, for saddle No1 (bottom) this is not the correct calculation, How does the program calculate |Mzz| for the bottom? Answer: That is correct. The equation for |Mzz| is different for the bottom than for the top saddle. The equation for |Mzz| bottom would be: Mzz = Rah*Hb + Rah*(2*Hb+H) Hb = height of the bottom saddle H the height of top saddle A new enhancement will be logged to document this equation for future reference. Item #3: Microprotol mistakenly calculations flange connection loaded External Loads. Answer: External loads on flange are considered as an equivalent pressure to major or reduce design pressure. See attached file for the calculation of the equivalent pressure. All calculation using a pressure will be by way the different if there is external loads applying on flange ( at equivalent design pressure). 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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