Applies To Product(s): AutoPIPE Vessel Version(s): V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Question #1: We have inputted trunnions characteristics for our vessel but there is nothing in the report Answer: "Lifted" Design case must be checked: Question #2: Creating new saddle standard for horizontal vessels and heat exchangers. Question #3: It should be possible in a future to complete vessels supports including the option of 2 rings supports? Answer: It is already possible when using brackets to select anchor option in the dialog. Question #4: Is it possible to set the nozzle projection from the insulation surface? Answer: Yes, it is possible to set the nozzle projection from the surface of insulation, in Vessel Properties dialog box, open the Geometry tab where the projection can be input in the field Dist. Insulation/Flange. For more details on this topic visit the following webpage: http://communities.bentley.com/products/pipe_stress_analysis/m/pipe_stress_analysis_gallery/269903.aspx Question #5: How is the tensile stress in bolts calculated? Answer: Calculation of the tensile stress in 1 bolt (refer to the image below) is performed as follows: Tensile force in the bolt F = [(Mzz / (db/2) / nb) /2 - Fp] Mzz is the bending moment due to wind or earthquake action db is the bolt diameter (xb = db /2 in the calculation report) nb is the number of bolt RAV is the vertical load due to wind or earthquake action Ws is the vertical load due to weight Question #6: Does the calculation of a body flange according to ASME VIII, div 1, consider a rigidity criterion? Is it possible to calculate a body flange considering the rigidity of the flange? Answer: Yes the calculation of a body flange according to ASME VIII, div 1, considers a rigidity criterion (par. 2-14). This paragraph has been included in the Appendix 2 so it is mandatory now, before 2007 it was a non-mandatory appendix. AutoPIPE Vessel is in accordance with the revisions of the code: if user selects a revision <= 2006 he has the choice to apply or not this criterion (shown in the screenshot below). Question #7: The calculation of the Heat Exchanger, the program dose 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. Question #8: I am designing a tall column with several trays and the program crashes while executing. Why does it happen and how to correct this? Is this because there is a limit on the height of the vessel? Answer: There is no restriction on the height of column in AutoPIPE Vessel, however the crash may occur because excessive number of loads being applied due to very large number of trays and or attachments as shown below: FIGURE 1 AutoPIPE Vessel has a limit of upto a maximum of 400 loads that can be applied for the beam model. A workaround could be to replace some trays and accessories and replace them by a single equivalent internal (vertical load) as shown, that way it would reduce the total number of applied loads and keep it within the limit specified above: FIGURE 2 The top 2 sets of trays (total 35) in figure 1 is replaced by an equivalent vertical load of 103005 daN as in Figure 2. The file executes without a problem when the weights of the trays are replaced by the equivalent load as shown above. Please note - reduction of the conical skirt in these scenarios may also resolve the problem and the reason for that is a conical section creates several different sections in the beam model (and consequently several points of load), so when the user decreases the length of the skirt then the number of loads is decreased. 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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