Applies To Product(s): AutoPIPE Vessel, Version(s): V8i Environment: N/A Area: FAQ Subarea: Original Author: Bentley Technical Support Group Comments, Questions, and Answers: Question #1: What can I do when I get an error by specifying aBody Flange type of gasket when this is on vegetable fiber using Annex G for controlling the bolt stress. I noticed if I calculate the flange without annex G I’m not getting a default to choose another gasket material. I’m also a little troubled about the calculation with Annex G for a ring type joint gasket. In the calculation it calculates in item G.6.4.1 gasket seating and the outcome is very Low, giving low forces. Answer: This configuration was not properly considered, please consider using one of the following solutions: Option #1: Use any other type of gasket, eg. elastomer or PTFE. Also increase the gasket thickness to larger than 0.00 (if you are using Design Check method you need to specify adequate dimensions). Option #2: This issue has been logged under TFS 69201 and will be fixed in the next version of the application (33.02.00.04 and higher). Question #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. Question #3: When choosing a 8" nominal shell size the O.D. is reflected as 8.78" O.D. (it should be 8.625"). Why? Answer: That seems normal, taking into account that your heat exchanger is requested using internal diameter (see general geometry dialog) You input for the shell a 8 in NPS Normally a 8 in NPS pipe has an external diameter of 8.625 in As your are working in internal diameter as defined in the general geometry dialog, the software start with an internal diameter equal to the 8in NPS value. If your wall thickness is equal to 0.25 in 8.625 + 2 x 0.25 = 9.125 in The problem does not occur if you choose in the general geometry dialog the option "Nominal" and select the pipe size. Question #4: How to import Aspentech edr file into AutoPIPE Vessel? Answer: Please follow the steps below: step 1: step 2: step 3: step 4: step 5: Click OK to generate the exchanger model. Question #5: The program incorect 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. 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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