Comments, Questions, and Answers for "Mass points per span" setting Item #1: Is there a report that indicates the final spacing of Mass points that are auto generated? See Also Tools> Model Options> Edit settings Bentley AutoPIPE
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Wiki Page: "Mass points per span" model options, edit settings for an AutoPIPE model
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Wiki Page: 01. Is there a report that indicates the final spacing of Mass points that are auto generated?
Applies To Product(s): AutoPIPE Version(s): ALL Environment: N/A Area: Modeling Original Author: Bentley Technical Support Group Date Logged & Current Version Mar. 2015 09.06.01.10 Problem: Is there a report that indicates the final spacing of mass points that are auto generated? We have a requirement that the mass point spacing shall not exceed x number of feet in the model. How can this spacing be verified in an AutoPIPE report when Model options - Edit Setting: "Mass points per span" is set to "A" (Auto) or "1 to 9"? Solution: Please see the following AutoPIPE help section: Help > Contents> Search Tab> enter "Mass points per span" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information. At this time, there is no report that verifies the distance between each of the mass points generated between 2 modeled node points in an AutoPIPE model. The following enhancement has been logged: TFS-E187234: Add feature to specify or report max. spacing of mass points per span See Also "Mass points per span" model options, edit settings Bentley AutoPIPE
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Forum Post: RE: Autopipe support displacement
Hello Mike, I uploaded the files in the following link. Please inform if I need to upload it somewhere else. If yes, please give me that link. Regards, Sandip Dey communities.bentley.com/.../secure_file_upload
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Wiki Page: 02-04. Tools> Model Options> Edit Model Options settings in AutoPIPE
Topics here are based on all the program settings found under Tools> Model Options> Edit: Distance L/D from flange/valve to bend Include Bourdon rotational effect Mass points per span Options to Renumber Use corroded thickness in all analyses See Also Tools> Model Options> Edit settings Bentley AutoPIPE
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Forum Post: RE: Support movement inspite of rigid defn
Yes Mike, I got the same results but my doubt is for support lets say at B23 and B24 suppport, pipe can move in linear direction agree but not support. See B23 support it shows 3.38mm in GY and B24 support it shows 4.24mm in GZ. The reason may be supports are attached to point B23 and B24, which are part of pipes. So pipes displacement at this points may be attached to support.
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Forum Post: RE: Doubts in viewing code stresses
But I would like to see if this request gets implimented in coming versions. Any way thanks Mike for the clarification.
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Forum Post: RE: Node numbering direction
Thank you very much for clearing that up. I was analyzing a line from the tank outlet to pump inlet and tried reversing the order which gave me different result. May be the gaps between the guides also change while reversing the direction.
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Forum Post: Hi I would like to know if you can work in AutoPipe with a AutoCad background. I intent using AutoPipe only for the pipework between structures eg treatment plants. I do not want to us it as a design package for pipe stresses, not at this stage anyway.
Hi I would like to know if you can work in AutoPipe with a AutoCad background. I intent using AutoPipe only for the pipework between structures eg treatment plants. I do not want to us it as a design package for pipe stresses, not at this stage anyway.
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Forum Post: RE: B31.8 - Corroded Thickness used in Longitudinal Stress due to Pressure?
Hello Robert, Unfortunately, "Use Corroded Thickness in All Analyses" setting may change the analysis results, see WIKI here . Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: RE: Support movement inspite of rigid defn
Hello Vishal, Correct, because the support is graphically attached to the node point (ex. B23), as the Node point moves in the animation so does the support. Regardless, always refer to the grids or reports to verify how much movement and in which direction a node point is being displaced per combination. We both agree that pipe displacement at the 2 supports (B23 and B24) acts in the axial direction of the pipe which a guide support does not restrain; axial displacement results are correct at both supports. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: RE: Hi I would like to know if you can work in AutoPipe with a AutoCad background. I intent using AutoPipe only for the pipework between structures eg treatment plants. I do not want to us it as a design package for pipe stresses, not at this stage anyway.
Hello Roelof, At this time AutoPIPE is able to import information it does not have a feature to overlay, xreference, super impose an image in the background of a model. This suggestion has already be logged as an enhancement and will appear in a future version of the program. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: RE: Autopipe support displacement
Hello Sandip, Ok I understand where your model is located. One more question, what is the name of your file? There are a number of files in this folder. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: RE: Multiple cases simultaneously for Time history vs. several independent
Hello Mlynch, The most important requirement in modeling a fluid transient with multiple branch connections would be confirming the start time of each branch transient is correct. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: RE: modal analysis bending and force output
Hello Chris, This would be tough to diagnose without a model. Please post your model here or log a Bentley Service Request. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Wiki Page: 07. What are the Participation Factors and the Captured Modal Mass in AutoPIPE's frequency report?
Applies To Product(s): AutoPIPE Version(s): ALL; Environment: N/A Area: Original Author: Bentley Technical Support Group Date Logged & Current Version Feb. 2017 11.00.00.22 Problem: What are the Participation Factors and the Captured Modal Mass in AutoPIPE's frequency report? What should be the minimum acceptable percentage value in all 3 axis directions? Solution: The participation factor is a measure of the importance of the mode in earthquake type load. The captured modal mass is another way of quantifying the importance of the mode and the two are related. The captured modal mass percentage shows how much of the response is attributed to a particular mode and also shows the mode orientation (X, Y or Z). The sum of modal masses should be 100% if all modes are counted. But since many modes are not counted, the sum is less than 100 and hence the importance of the ZPA and missing mass options for dynamic analysis. Please refer to the topic "Missing Mass and ZPA Correction" in the online help for more information. The participation factors are calculated from the product of the mode shape, the mass matrix and a vector of ones. For mode i the participation factor is calculated as: Participation_Factor_i= Transpose(ModeShape_i) * MassMatrix * {1} The mode shape is mass normalized. The above equation is used three times for X, Y and Z directions. The mass participation report illustrates how sensitive each of the piping system’s modes are to the dynamic loading. High modal participation factors indicate that the mode is easily excited by the applied dynamic forces. If subsequent displacement reports indicate high dynamic responses then the modes having high participation factors must be dampened or eliminated. Once a particular mode is targeted as being a problem, it may be viewed in the mode shape report, or graphically via the animated mode shape plots. A common rule of thumb is to capture at least 75% of the modal mass but the missing mass correction will capture the remaining modal mass for an accurate dynamic analysis. Question: Do we have to make sure mass participation is 75% or higher in all 3 directions (X, Y and Z)?. Answer: The higher the captured modal mass, the better accuracy you would get for your results. Try increasing the number of modes and check whether your modal mass is reacting to increase in modes. Some guidelines on trying to determine whether you have sufficient modes is as shone on Wiki page here. The usual procedure for determining how many modes are sufficient is to extract a certain number of modes and review the results; then to repeat the analysis while extracting 5 to 10 additional modes, and comparing the new results to the old. If there is a significant change between the results, a new analysis is made, again extracting 5 to 10 more modes above those that were extracted for the second analysis. This iterative process continues until the results taper off, becoming asymptotic. If results continue to be significantly different for different cut-off frequency, this would indicate that a particular loading on a specific piping layout has higher frequencies. Again, It is important to capture a significant amount of mass in all directions. For a complex models, anyone's guess which direction will be significant dynamically. Thus the mode shape and mass participation results provides an indication on number of modes / frequency set point required. The important part is that you capture all the modes when carrying out dynamic loading, or apply the maximum load statically using the ZPA. Remember, ZPA is very conservative. If a model has captured most of the mass, this would suggest that the dynamic approach will be OK, and ZPA is not needed. However, if one prefers conservative results, include ZPA. This is an Engineering decision outside of Bentley's scope. See Also "Frequencies" sub-report Bentley AutoPIPE
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Forum Post: RE: Captured modal mass in Fluid Transient analysis
Hello Fukun, See following WIKI locations for information on modal analysis and Frequency sub-report: 1. Dynamic "Modal" Analysis 2. "Frequencies" sub-report select: Item #1: What options are available to increase the participation factors in a model with multiple disconnected systems? Item #7: What are the Participation Factors and the Captured Modal Mass in AutoPIPE's frequency report? This should answer your questions in detail. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: Terms related to user defined rotating equipment
Hello forum, In user defined rotary equipment, What is the meaning and significance of following terms: 1) Reference point 2) Resolution point 3) Resolution point offset 4) Pedestral axis I went through almost all community post and help content regarding these topics but not able to understand completely.
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Forum Post: RE: Import Coordinate Data into AutoPIPE - Importing an Excel File
Hello Shahram, Would it be possible to share the excel file and model that we can use to review this issue? Please post files here or ask that you log a Bentley Service request and send the files for review. Thanks for your time and efforts. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: RE: A335 P36 CL1 code allowable stress incorrect
Hello Zhixin, Yes, if possible please post AutoPIPE model or log a Bentley Service request and send for review. Thanks for your time, Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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Forum Post: RE: All elements of the model not visible in the flex table
Hello Zaman, What application and version are you using? Can you post the model and/or screen shots? Thanks for your efforts. Regards, Mike Dattilio Bentley Product Advantage Group Analyst AutoPIPE Product Line Bentley Systems, Inc. ===================================================
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