Applies To Product(s): AutoPIPE Version(s): ALL; Area: Date Logged & Current Version Aug 2019 12.01.00.10 Problem: For a Node Locked (Non-Select) license, does the application need to be checked out? Solution: If you are a Non-Select User with a Node Locked license then Yes , you will need to manually check out each license for the applications you wish to license. In addition, take note of the check-out expiring date for each license. Just before the expiration date, you must check back in all the software licenses and then check out a license for each application you wish to be licensed. This is a manual process and will need to be performed annually. Workaround Only workaround to avoid annually checking in / out licenses would be to update to a Select subscription account. Please contact your Bentley salesperson or Bentley for details. See Also Managing License issue Non Select / Node Lock users Bentley AutoPIPE
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Wiki Page: 03. For a Node Locked (Non-Select) license, does the application need to be checked out?
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Wiki Page: 04. How to move an AutoPIPE License from one computer to the next?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Licensing Original Author: Bentley Technical Support Group Date Logged & Current Version July. 2017 11.00.00.22 Problem: How to move an AutoPIPE license from one computer to another computer? Solution: Contact Bentley by Phone or see WIKI here . See Also Managing License issue Non Select / Node Lock users Bentley AutoPIPE
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Wiki Page: 09. Node Locked (Non-Select) Licensing AutoPIPE
topics related to Licensing AutoPIPE with a node locked license 0. Non-select account / user 1. Activating as a NON-SELECT or Node Locked user Bentley On Site Admin will need to log into Connection Center Portal to register a first time computer or follow instruction to unlock and reregister a different computer - click here Activating as a non-Select User via SES - click here 2. Move Node lock license from one computer to the next - click here (instructions near bottom of page) 3. Maximum duration for a node locked license 4. Does the application need to be checked out? - See Also Node Locked (Non-Select) FAQ Managing License issue Bentley AutoPIPE
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Wiki Page: Q. AutoPIPE crashes or nothing appears on startup (i.e. no splash screen), Event Viewer log contains: Faulting module path: nvoglv32.dll
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Crash Date Logged & Current Version March 2024 23.00.01.367 Problem: The following appears in Event Viewer when AutoPIPE crashes on start up: Faulting application name: autopipe.exe, version: 12.8.5.27, time stamp: 0x655da97c Faulting module name: nvoglv32.dll, version: 31.0.15.3667, time stamp: 0x64af3e5c Exception code: 0xc0000005 Fault offset: 0x014df5e6 Faulting process id: 0x4ec4 Faulting application start time: 0x01da76d8222b56c5 Faulting application path: C:\Program Files (x86)\Bentley\AutoPIPE CONNECT v12\autopipe.exe Faulting module path: C:\WINDOWS\System32\DriverStore\FileRepository\nvdw.inf_amd64_e36090c103bd5649\ nvoglv32.dll Report Id: 816f618d-7518-4f58-a27e-528bd4f5300f Faulting package full name: Faulting package-relative application ID: Why and how to avoid? Solution: In one particular report case, the computer used Nvidia graphics card where the driver had just been updated from Nvidia drivers v31.0.15.1766 to use the new driver; Nvidia drivers v31.0.15.2727 or newer . Operating system and graphics card model do not seem to be factors. The solution to this reported case was to role back to the previous graphics card drivers. See Also Application Crashed or Freeze Bentley AutoPIPE
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Wiki Page: C. AutoPIPE Crashes / Freezes on Start-up
What to do when AutoPIPE freezes / crashes on Start-up Known issues: There can be any number of reasons why the application will not start, one or more of the following may apply. Graphics card settings - NVIDIA Malware / Security application Windows Defender - Disable Extension points Company forced update WinDBG file contains Datamnger.dll Event Viewer logs contain Faulting module name: ntdll.dll Faulting module name: InProcessClient64.dll Faulting module path: nvoglv32.dll Message appears on screen Script Errors "Bentley AutoPIPE Application has stopped working..." autopipe.exe - Unable To Locate Component autopipe.exe - System Error Microsoft Blue Screen - A problem has been detected Slow to start See Also Application Crashed or Freezes Bentley AutoPIPE
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Forum Post: RE: Local Displacements
Is this option is now available in Auto pipe 12.04 ?
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Forum Post: Bentley AutoPIPE Basic User Accreditation
The AutoPIPE Basic User Accreditation is currently down. Any idea as to when it will back up??
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Wiki Page: 47. Explain why is it not possible to split the shell in 3 parts? And why it is failing in strength at shell/channel joint?
Explain why is it not possible to split the shell in 3 parts? And why it is failing in strength at shell/channel joint? Example: Vessel under combination loading - Design case, Case 2 - Operation (Corroded inertias) (New Weight), Moments and loads in plane of saddles. PG 49 of the report Shear loads a. Support #1= 2,008.5 and 1,773.0 b. Support #2 = 4,100.3 and 4,105.7 Next go to Saddles, sub section Saddle #1, Case 2, page 112, Maximum shear load : Q i = 2,127.1 daN Saddle #2, case 2, page 122, Maximum shear load : Q i = 4,633.7 daN Why are the Shear values Qi at the saddles different than the Shear diagram at the saddles? Answer: They are the result of the vectorial sum of the maximum shear stresses as calculated in the equivalent beam:
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Wiki Page: Shell and Tube Heat Exchangers
01. When choosing a 8" nominal shell size the O.D. is reflected as 8.78" O.D. (it should be 8.625"). 02. How to import Aspentech edr file into AutoPIPE Vessel? 03. For a shell and tube exchanger with fixed tubesheets, the AutoPIPE Vessel is locked with the "Mechanical cleaning" option even if the option is unchecked? 04. How to manage the baffle spacing of a heat exchanger in AutoPIPE Vessel? 05. How to manage the number of Tubesheets in an AutoPIPE Vessel heat exchanger 06. How to see the pass order number and how to change it in an AutoPIPE Vessel model? 07. Model imported from HTRI suggest tubesheet has 360 tubes, however AutoPIPE Vessel suggest only 332, why? 08. Number of Heat exchanger tubes and path are different in the AutoPIPE Vessel report, why? 09. When changing the material on tubeside, focus of the model changes to a different location in an AutoPIPE Vessel model, why? 10. Why are the ASME 2019 - appendix A-2 calculation for Tubesheet with tubes expanded + seal welded not performed? 11. Why is tubesheet layout not full of tubes? 12. How can I insert the shell connection on the head of a heat exchanger in AutoPIPE Vessel? 13. How to connect two different shell radius (ex. dia #1 =4000 mm, dia #2 = 4220 mm) that have a 50 mm gap between them in AutoPIPE Vessel? 14. How to model customized base plate of a Saddle support for Shell and Tube Heat Exchanger in AutoPIPE Vessel? 15. Use TEMA Metric Bolt Root Area (TEMA Table D-5M) from section 9 in an AutoPIPE Vessel model. 16. Where to input extra cladding thickness on tubesheets in AutoPIPE Vessel? 17. How to Change the corrosion allowance for clad bottom plate on a heart exchanger model in AutoPIPE Vessel? 18. How do I design a stacked heat exchanger? 19. How does AutoPIPE Vessel set the design conditions for tubesheet? 20. How to define shell length in different types of Heat Exchanger in AutoPIPE Vessel 21. Where do we mention Creep and Fatigue data on Heat exchanger ? We can see tick mark but how about magnitude? 22. Where do we mention MMT (Mean Metal Temp) in AutoPipe Vessel for Fix tube sheet Heat Exchanger? 23. Heat Exchanger Geometry 24. Heat Exchanger Pass Partition Plate Modification 25. How to manage the baffle spacing of a heat exchanger? 26. Does AutoPIPE Vessel automatically update the tubesheet design conditions when the heat exchanger design conditions are changed? 27. How to use the Tube sheet Design Conditions dialog in AutoPIPE Vessel? 28. What is the difference between tubesheet design condition and design case? 29. While designing a AutoPIPE Vessel heat exchanger tubesheet flange, the "Use EN 13445 Annex G/EN 1591" option is greyed out, why? 30. The definition of the characteristics of the gasket under the pass partition in a heat exchanger is not possible 31. How to model and design heat exchanger with shell dimension based on nominal pipe size? 32. How to specify shell ID instead of tube numbers in modeling the tube layout? 33. How is shell length for heat exchanger determined in AutoPIPE Vessel? 34. How can I input a specific bundle characteristics using AutoPIPE Vessel? 35. How AutoPIPE Vessel calculates the shell length at the time of Heat Exchanger Design? 36. How is shell length interpreted in AutoPIPE Vessel? 37. Is the corrosion allowance taken into account for the tubes in an ASME design? 38. Why can't I choose a "Double Segmental" baffle type for a BFM heat exchanger which is a common design method for those? 39. What settings to use for DIC and OTL on the harness tab in AutoPIPE Vessel? 40. Baffles are deleted when deleting a Nozzle element 41. Why effective diameter formula is different in operating and hydrotest condition (tube side) compared to hydrotest condition shell side? 42. Tube Bundle report is not aligned with bundle layout 43. Axial tube stress and Tube to tubesheet joint check for U-tube tubesheet 44. Calculate MAP (New and cold) 45. Why relocation of the pass partition is reset when clicking on "compute" (heat exchanger)? 46. Calculate Maximum shear load;Qi 47. Explain why is it not possible to split the shell in 3 parts? And why it is failing in strength at shell/channel joint? See Also AutoPIPE Vessel - Frequently Asked Questions Bentley AutoPIPE
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Wiki Page: 03. How to reset my Profile Preferences for AutoPIPE?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Settings Date Logged & Current Version April. 2018 11.03.00.08 Problem: How to reset my Profile Preferences for AutoPIPE? Solution: Option #1 1. Close all but one instance of AutoPIPE before before continuing below. 2. Open Preferences dialog - click here . 3. Press " Reset Defaults " and press OK. Notes: a. See AutoPIPE help for complete details on this dialog. b. The reset defaults option dialog restores the files in User Profile folder and Program Data folder to their default state. This may be a requirement after installing / updating the software beyond the initial installation. c. Again, users may want to backup their Profile Preference folders if they contain customize files (ex. mapping files, material libraries, isometric settings, *.ini files, etc..), This is easily accomplished by first closing all AutoPIPE applications, pressing the Explore button for each Path and renaming the folder to a slightly different name. Example: press the Explore button for "User Profile Path", note the current folder name = " AutoPIPE CONNECT v12 ", rename folder to " Custom - AutoPIPE CONNECT v12 " Starting AutoPIPE will automatically regenerate the necessary profile folders. Then if required, move customized files as needed from one folder to the next, remember to be vigilant during this process to place files in their correct location. 4. Enable / Disable features as needed, and press OK to continue. 5. After Resetting Profile Preference folders, restart AutoPIPE. Option #2 1. Close all instances of AutoPIPE before continuing below . 2. Delete the AutoPIPE folder mentioned in both the User Profile path and Program Data path of the Profile Preference dialog. 3. After deleting the folders, restart AutoPIPE. See Also Profile Preferences Settings - AutoPIPE Bentley AutoPIPE
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Wiki Page: "Unable to open the asme2010.mdb database"... Bentley AutoPIPE message is displayed in the program?
Applies To Product(s): AutoPIPE Version(s): All Area: Message Original Author: Bentley Technical Support Group Date Logged & Current Version April. 2020 12.03.00.17 Problem: The following warning is displayed when using AutoPIPE: --------------------------- Bentley AutoPIPE --------------------------- Unable to open the asme2010.mdb database --------------------------- OK --------------------------- Why and How to avoid it? Solution: Note : As a first step suggest to run the application in Administrator Mode. This may fix the issue. Possible reason #1: During installation some files were not installed correctly. Therefore, follow the steps given below: 1. Close all but one instance of AutoPIPE before before continuing below. 2. Open Preferences dialog - click here . 3. Click on each Explorer button to open their folder locations in File Explorer. 4. Next, close the current AutoPIPE application. At this point, all AutoPIPE applications should be closed. 5. Go to each File Explorer window (User Profile path and Program Data path) that was opened from step above, and delete AutoPIPE folder 6. Use standard Windows procedure for uninstalling applications, Uninstall AutoPIPE. 7. Reboot the computer. 8. Download a fresh installation file from Bentley's Software downloads page 9. Install AutoPIPE 10, Start AutoPIPE. Does this resolve the issue? If Yes , great!! continue using the application. If No continue below Possible reason #2: For reasons unknown, the file is missing from program folder. Therefore, perform the following: 1. Ask around, if there is a person who is using the same exact version and ask that they send you their file (asme2010.mdb) from their program installation folder. 2. After receiving the asme2010.mdb file, place it in the same exact location on your computer. 3. Reboot your computer 4. Start AutoPIPE Does this resolve the issue? If Yes , great!! continue using the application. If No continue below Possible reason #3: This issue was observed mostly when running Support optimization , when two or more models are opened accessing the same file (asme2010.mdb). This issues was fixed in AutoPIPE 12.01 and higher (956393). Suggest to upgrade to latest version of the program. Note: If this issue is occurring in the latest version where the above does not resolve the issue, please file a Service Request mentioning this WIKI page. See Also "Bentley AutoPIPE" Messages Bentley AutoPIPE
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Forum Post: RE: Local Displacements
Greetings Abdulkalim, Development team is working on this enhancement request 102687 , you will be able to see this feature in future releases of AutoPIPE. I request you to raise this idea on idea page wiki link here so that any update on this feature will be notified to you. The Program manager also comments on these features on Idea page to get the user updated on the activities happening for that feature. Regards, Shrey Sharma Technical Support Engineer,Global Technical Support, Bentley Systems,Inc. 9 th Floor, Tower C, DLF IT Park, 8 Major Arterial Road, Newtown, Kolkata – 700156 T: + 91-2066021018 www.bentley.com
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Wiki Page: S. Viking Johson Couplings - Modeling Approaches, Tips, Techniques used in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): ALL Area: Modeling Original Author: Bentley Technical Support Group Problem: What are some typical modeling approaches for Viking Johson Couplings? Solution: Follow the steps to model the Viking Johson Couplings: 1. Simply model a piping element with user defined properties having started from a Achor point at A00 and then insert a piping element to A01 of certain length suppose 1000mm. 2. Insert a piping element which length suppose 1250mm to A02 and A02 is the point from where the coupling starts supposing I am taking long sleeve L03 coupling. 3. Then insert a pipe run equal to 50mm till node no. A03. Now insert an expansion joint of length 150mm to A04 (considering setting gap max.X as per catalogue) 4. Now the user has to define the stiffness (Axial, bending & torsional) values of expansion joint, that totally depends on the user. And the pressure trust area is the pipe area. As shown in below screenshot. 5. Similarly, insert a point at 50mm from A04 to A05 and then insert pipe element of 1250mm to A6 and then 1000mm to A07.and insert an anchor point at A07 to close the system. 6.Now insert a guide support at A02 connected to A05,define zero gaps for all the direction and then the friction coefficient is the value which is between the compressed gasket and pipe surface. This value will provide the resistance bending force between the coupling and pipe. Stiffness of the bolts user has to define as the support stiffness. As shown in screenshot below. Note: Better to get the bolt stiffness values, friction values between the gasket and Pipe OD from the vendor. See Also Model Different Types of PIPING Components Bentley AutoPIPE
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Wiki Page: 01b.Model Different Types of PIPING Components - AutoPIPE
Attention: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> This help has been provided in order to give users ideas for modeling typical piping arrangements. The steps shown in each example should not be taken as the only method available to create models. In addition, the intent of the examples is to present ways to create adequate models of specific piping components for analytical purposes. Anchor Bends Cuts: Cold Spring Flexible Joints Frames Hangers Nozzles Pipes Reducers Rotating Equipment Supports Tees Valves Vessels Additional modeling approaches, tips, and techniques for different types of piping components? a. Bends b. Flanges c. Flexible / Expansion Joints ( Pressure Balanced, Expansion, Hinged, Gimbal, Single Bellows, Tied Bellows, Tied Universal, Ball and Socket, Slip Joints, etc..) d. GrayLoc Connector e. Nozzle f. Pipe g. Orifice type components h. Reducers i. Tee, Cross, or Branch fittings (i.e. weldolet, sockolet, Y-pipe, etc..) j. Valves k. Victaulic / Grinnell Grooved Couplings l. Model PN-EN 10253-2 Type B Pipe Fittings m. Mule Ear Return or Plug Headers n. Strainer / Filter o. Flow Meter p. Threaded, Socket, welded type connections q. Offset Drip pipe r. Pipe End Cap s. Viking Johnson Coupling See Also Modeling Approaches Bentley AutoPIPE
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Forum Post: RE: How can I model a coupling (Viking Johson) on a pipe?
Greetings Valdemar, Please see the modeling approach of the Viking Johnson Coupling and yes, we have considered the expansion joint in the modelling apporach. Refer the wiki Link here to know the modeling approach of the Viking Johnson Coupling in AutoPIPE. Question: Can I model the coupling as an expansion joint with tie-rods and consider the joint area to be zero cm2? Answer: Yes, you can also model it as a tied expansion bellows also, but the tied rod should have the stiffness values of the bolts. Since we have coupling center sleeve component over the free space (at Setting gap X) and that will be having some area which will also have pressure thrust generated. So, in the above modeling approach we have considered the pipe area for this expansion pressure thrust area. Regards Shrey Sharma Technical Support Engineer,Global Technical Support, Bentley Systems,Inc. 9 th Floor, Tower C, DLF IT Park, 8 Major Arterial Road, Newtown, Kolkata – 700156 T: + 91-2066021018 www.bentley.com
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Forum Post: [AutoPIPE Forum] How can I model a coupling (Viking Johson) on a pipe?: Suggested Answer
Greetings Shrey Sharma, Thanks for your reply. I modeled it and ran a simulation according to the instructions given in the link. My problem is that the pipes will be connected to a tank and a pump, with the following operating conditions: 4 bar and 50 ºC. With these conditions, the loads at these connection points are very high. My expectation was that these joints would work in the same way as the Victualic couplings, as demonstrated on the AutoPiPE wiki: k. Victaulic / Grinnell grooved fittings - Modeling Approaches, Tips, Techniques used in AutoPIPE. by Nasir Zulflqar. In this simulation, the pressure area is not considered, and the loads are low. For this Viking-Jhonson coupling, couldn't we have an identical approach? Best regards / Cumprimentos, Valdemar Santos
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Forum Post: RE: [AutoPIPE Forum] How can I model a coupling (Viking Johson) on a pipe?: Suggested Answer
Greetings Valdemar No, i t is not possible to use the same modeling technique for a Viking Johnson slip joint and a Victaulic coupling as they have completely different connection mechanisms. Victaulic rigid coupling has groves machined into the pipe which the coupling is recessed into which does not allow any axial movement. Nonetheless, the friction resulting from the deformed gasket acts as the sole hindrance to the axial expansion of the Viking Johnson slip joint. In essence, a Viking Johnson slip joint can be likened to an unrestrained bellows. Therefore, the modeling should reflect this similarity of a unrestrained bellows and not a Victaulic fitting.. Regards, Mike Dattilio Design Analysis Engineering Group Senior Analyst Bentley Systems Inc =============================================================================
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Forum Post: Penetration modeling
Hi, I'm trying to model the section in the picture. How do I model penetration in autopipe? Thanks, Adi
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Forum Post: Calculations according ASME B31.3 2020 chapter IX - High Pressure Piping
Hi How do I check that the calculations are made in accordance with chapter IX - High Pressure Piping of ASME B31.3 2020? Regards, Szymon
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Wiki Page: AutoPIPE FAQ - Soil
Question: Why does it appear that soil is not being applied to the model? Answer: Most common cause of the issue is that the model is being analyzed as a Linear Analysis when it should be analyzed as a Non-Linear Analysis. See AutoPIPE help for details on how to perform a Non-Linear Analysis. Question #1: What is an adequate spacing required for piping points (nodes) and soil points? Answer: There is no one answer to this question. See AutoPIPE's help for suggested soil spring spacing based on Zone 1, Zone 2, or Zone 3 piping. These are only suggestions may need it increase/decrease soil points as required for convergence issues. Question #2: The more the nodes, some of the load cases (temperature, pressure and user-defined) do not converge Answer: If a model does not converge, please see the following AutoPIPE help section: Help > Contents> Search Tab> enter "Failure to Converge" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information. Review the *.LOG file to understand where the failure is occurring and address the location. See AutoPIPE help for details about the *.LOG file. Question #3: What is the most soil deformation that AutoPIPE can handle? Answer: Soil Deformations This can be a difficult problem, since the settlement is such a large soil deformation of 1600mm All beam theory piping analysis programs such as AutoPIPE, Caesar, pipeplus are based on small deformation theory and large displacements can give an ill-conditioned solution and erroneous results. As an example, large deformation across a large span of 200m. The maximum slope of the pipe may be of the order of 0.025 radians and the solution should be ok As a check that AutoPIPE can handle these large deformations use the following rule of thumb. Check that the maximum slope angle in radians of the deformed pipe = approx. the sin (slope angle) then the solution should be ok. One method to simulate subsidence of known amount e.g 25mm see below. Set the yield P1 = 25 as shown below and K1 (initial) value = 0.001 and calculated soil stiffness = K2 (final) SOIL PROPERTIES Soil Initial K yield P Final K Yield disp ID Dirn (N/mm/mm ) (N/m ) (N/mm/mm ) (mm ) ------ ------- ---------- --------- ---------- ---------- SOIL1 Horiz. 6.540 699861.00 0.000 07.0118 Long 17.540 43859.00 0.000 2.5005 Vert Up 2.790 139303.00 0.000 49.9291 Vert Dn 0.001 25.00 23.030 24.9999 One method: If the maximum settlement is unknown, then model the soft waterlogged soil over the known span and known firmer soil at ends. Apply the over-burden sand weight as UDL load or vertical wind load (to simulate the pressure of the 4m sand) on the pipe and observe the deformation and check the resulting maximum slope. Note: ensure the final soil stiffness values K2 is not = 0 but a finite value e.g 0.001. The vertical down K2 value should be known (ie final soil conditions after settlement) and the P1 (soil yield ) value can be 'tweeked' to achieve the distance between the soft and final soil condition. Check that the actual pipe movement reaches the final soil condition otherwise the solution may become ill-conditioned. Maybe the sand has a influence on calculating the upward soil stiffness but this direction should not be important.. Question #4: Is there an error in the program. Why is the high stiffness values being used for the low Stiffness calculations and vise-versa Low values being used for the high stiffness calculations: Answer: This is not an error. The Yield Displacement is calculated via formula YD = P1/K1. However while calculating the K1 & P1 stiffness values we use low yield displacement values for high stiffness value and vice versa. This behavior is also described in the note Note: High yield disp. is used for low stiffness. Just below the Pipe direction selection on the dialog (shown below). For the parameters, the following rule is applied: 1. If the user updates a value in the low column, which is greater than high column value, the low column value is assigned to the high column value. 2. If the user updates a value in the high column, which is lower than the value in low column, there is no update to the low column. This behavior is missing from the online help and will be added in a future version of the program. Question #5: What is the best method to model soil settlement in AutoPIPE when 25.4mm (1 inch) of pipe settlement is required in the model when there is a probability of over -excavation and greater than 25.4mm (1 inch)? a.Impose an upward displacement on the support or b. Impose a downward displacement on the soil Do soil springs act in both tension and compression? What is the best way to model pipe settlement where over-excavation has occurred? Answer: In our opinion, approach (b) is better as the displacement is applied in a more discretized fashion than in (a). In AutoPIPE, imposed displacements can be applied only at points which are supported or buried. If the imposed displacements are applied as in (b), there will be compression in the soil springs below the pipe and tension in the soil springs above the pipe. Yes, soil springs act in tension as well as compression as per the assumption of bilinear behavior. Please refer to AutoPIPE help for more information. We think that it is more reasonable to retain the soil springs below and impose displacements on the soil points to model the soil settlement in areas of over-excavation. You may also consider using incline supports with a gap of 1" below the pipe so that the resistance of soil below the pipe is engaged after the pipe displaces 1" to close the gap (similar to scenario #2 in the figure below). However, the yielding of the soil cannot be modeled using this approach of using incline supports to model soil stiffness. Closer to the support, the pipe displacement is relatively less compared to mid-span. If large imposed displacements are modeled close to the support you might see spurious high stresses. ( WYMIWYG - what you model is what you get.) Yes, not modeling top soil might be a reasonable approach. As there is lesser restraint after removing these soil springs, the pipe support reactions are likely to be lesser as you have rightly observed. Question #6 What is the correct metric unit for the variable "f" at the bottom of the Edit Soil Properties window near Soil Overburden Loads? I am confused because the displayed imperial unit is psi, whereas the metric unit is N/mm. Answer : Yes, this is an oversight in the program (AutoPIPE V8i 09.06.00.xx and lower). If you convert the PSI value over to metric units the value displayed would have the units of N/mm^2. The development team is aware of this issue and will fix in a future version of the program. Question #7: Open the soil dialog screen and press Edit Soil Parameters button, set Calculation method = AutoPIPE, notice that the soil parameter "horizontal stiffness parameter ki" is always has the units of lb/in3 when the input units are set to SI. The lb/in3 units are the same in the output listing. The numerical value of the ki parameter is the same in the output listing regardless of units selected. is this an error? Answer: No it is not an error. Open the Edit Soil Parameters dialog screen, press the help button, under "AutoPIPE only parameters" select the hyperlink for "Horizontal Stiffness Parameter, ki" and read the online help. The reason for this is that there is no conversion in the unit files for lbs/in^3. We will require adding an additional unit in all our unit files to represent this lb/in3. Otherwise, the same value is used regardless of units selected in the model. Item #8: What type of discretized soil foundation is implemented in AutoPIPE (Example Winkler Soil Model, Filanenko Borodich Model, continuous model etc... Answer: To be added in the future. Item #9: How does imposing a support displacement effect the soil spring at the imposed support displacement and how does it effect adjacent springs ? Answer: Look at it this way, each support can be considered a spring with a base. The base is attached to the imaginary ground in the program. When you apply "Impose Support Displacement" to a support, the base will physically moved when a specific load case is applied during the analysis. These values are specified when inserting an "Impose Support Displacement". As mentioned in the online help, soil properties are essentially spring supports at intervals with the correct stiffness values. Therefore, "Impose Support Displacement" can be assigned and will affect Soil point locations. Furthermore, only those soil points that actually have "Imposed Support Displacement" assigned will move when the specified load case is applied during the analysis. This action will affect surrounding piping because the pipe is not made of bubble gum. Example: If a set of soils points between two node points have a 5 inch Impose Support Displacement assigned. When the indicated load case is analyzed, these soil point bases will try to moved the 5 inches, while the rest of the adjacent soil springs will resist this movement but ultimately will be displaced by a fraction of that 5 inches until the impose support displacement no longer affects the adjacent soil spring. Typically the pipe will have a bell shape curve to it. Item #10: Is there anyway to use K1, P1, K2 soil parameters to hand calculate the displacement seen in AutoPIPE's output report for verification the program is correctly using the soil values? Answer: It is important to note that AutoPIPE uses a non-linear iterative process of displacements to determine the actual spring stiffness for soil. P1 is the limiting force that determines which soil stiffness is used. This process is very complex. The numerical verification of the soil spring analysis in AutoPIPE is done by comparing results to the following reference: "Buried piping - An analysis procedure update", ASME Publication PVP- Vol 777, ASME Pressure Vessels and Piping Conference, Portland, June 1983 (402258). Item #11: We have a case in which the steel buried piping system has following layers, Layer 1: Soil depth of 1m Layer 2: Concrete slab of 0.15m Layer 3: Compressed Stabilized Material 0.50m Layer 4: Vehicle of 80 Ton How to consider these concrete slab level? Answer: There is no direct method to consider Concrete layer in between two soil layers. Workaround in this condition is to add soil properties of layer 1 at the required pipe sections. Then calculate equivalent pressure on pipe due to weight of concrete (Layer 2) , Compressed Stabilized Material (Layer 3) and weight of vehicle (Layer 4). Add this pressure as a Soil Overburden Loads. Open the soil properties and click on the Soil Overburden Loads, In Soil Overburden Loads Tab choose User Defined against Surface Live Loads type, Enter the calculated Pressure on pipe due to surface loads.
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