Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: reports Subarea: Original Author: Bentley Technical Support Group Problem: One of the following has occurred: a. Have 2 separate models with identical input, but the results are different using the same version of AutoPIPE or b. Have 1 model with identical load-cases / analysis sets and the results are different or c. Same model opened in 2 different versions of the application but has different results in each version Why has this happened and how to fix? TR Number: none Product: AutoPIPE Area: General Problem ID#: 71085 Answer: Check the model output reports to verify input is truly identical. A. Comparing 2 AutoPIPE models 1. Start AutoPIPE with a valid license. 2. Open model DAT 3. Select Tools> model input listing> check on all sub sections to be printed, and press OK button 4. Analyze the system, Analyze> Analyze all. 5. After the analysis is completed, on the load combinations dialog, delete all code and non-code combinations. Press the "Reset Defaults Only" button to automatically recreate the default combinations to be compared (see Note #1. below). Now create a complete output report; Results> Output report> Check all sub reports ON, except "Sorted Stresses" 6. Perform steps 2-5 for both models. 7. Use a program like "Beyond compare" or "Ultra Compare" to compare the files. This will quickly highlight and differences between the models. Note: take extra care to be sure that all Analysis summary settings are exactly the same (Tools> Model Option> General, Edit, Results, Buried Pipe Options, etc..). In addition for comparison purpose only, set Tools> Model Options> Results> Sustain Margin (Y/N/E) = N. This setting will affect the allowable calculation. 8. Expect to find different time stamps and maybe some info that may be out of sync. However, everything else should be identical. 9. Fix any differences between models until they are identical and then run an analysis to compare results. 10. If the models still produce different results, follow the procedure for logging a Service Request with Bentley, add model APC & supporting files to run the analysis in a ZIP file , and send to Tech support for review. B. One AutoPIPE Model with similar analysis sets, but different results 1. Start AutoPIPE with a valid license. 2. Open model DAT 3. Analyze the system, Analyze> Analyze all. 4. Open the model's input grid, select the Press/Temp/PipeID tab, copy the entire grid to Excel, Use Excel to compare each Temp/Press loadcase to confirm identical settings (could have different Press, Temp, Expansion, Hot Mod,Hot Allow, or Yield values). 5. After the analysis is completed, on the Load Combinations dialog, delete all code and non-code combinations. Press the "Reset Defaults Only" button to automatically recreate the default combinations to be compared (see Note #1 below). Now create a complete output report; Tools> Model Input listing> check on all sub reports. Then under, Results> Output report> Check all sub reports ON, except Sorted Stresses. 6. Review model listing to confirm no additional Xtra Data is assigned to a load-case (i.e. Force, distributed load, concentrated force, cut short, etc..) 7. If the models still produce different results, follow the procedure for logging a Service Request with Bentley, add model APC & supporting files to run the analysis in a ZIP file , and send to Tech support for review. C. Same model opened in 2 different versions of the application but has different results When it comes to comparing the results between 2 different versions of the AutoPIPE; Yes, the results may or may not be different. The CAE development team is constantly improving the software with new enhancements and fixing known issues. Some of these known issues are directly related to the analysis results. Therefore, Yes the results can be different from one version to the next. The newest version should be considered the most trusted value as the development team has found a problem and fixed it. Remember one of the perks about being part of the QA&R program is access to the AutoPIPE Error reports and notification of Major issues. See above instructions when comparing models Notes: #1. Under certain circumstances what looks to be a default code combination may in fact not be a default code combination. Steps to Repeat: Model: Walkthru.dat (included in AutoPIPE example folder) 1. In tools->Model options->General: Set operating cases to 2 2. Modify the Press/Temp data in case 2 for all points: P2 = 400 psi, T2 = 550 deg F 3. In static analysis set, select GR/T1/P1 (via pressure extension) 4. Create a second analysis set with only GR case 5. Analyze the model, and to filter the results, select Max P{1} for print only 6. In code compliance report, the Stress/Allow is 6447/14500 7. Delete all combinations 8. Create a user combination hoop category and sum method, Max P{1} (keeping the name same as a default combination name) 9. Now press ‘Reset Defaults Only’, the user case gets converted to ‘Default Type’, also uncheck the Auto Update flag 10. Viewing the results for Max P{1} gives Stress/Allow of 8596/14500 which differs from the results calculated in step. 6 This issue has been logged under TFS-D172835: A user defined code combination with same name as a default code combination can produce erroneous results. (logged Feb 2015) Avoidance: When creating user combinations avoid using Default Combination names. If you are not sure if this has happened in a particular model, delete all Default Code and Non-Code combinations from the model and press the "Reset Defaults Only" button to have AutoPIPE recreate the official default combinations. 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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