Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group AutoPIPE online help has the following 7 support example systems available for review, Inside of AutoPIPE select: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Support> Note: see each support example and related questions below Answer: a. Rigid Anchor with Thermal Movement no questions on have been submitted for this support example b. Flexible Anchor Model 1: Local Flexibility of the Attached Equipment no questions on have been submitted for this support example Model 2: Definition of a Hinge Support no questions on have been submitted for this support example c. Anchor Releases for Hanger Selection no questions on have been submitted for this support example 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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Wiki Page: 01. Available AutoPIPE online Help Example Methods for Modeling Anchors with related FAQ's.
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Wiki Page: Modeling Anchors in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE 09.06.01.10 Select Anchor from either the Insert or Modify menu to display the Anchor dialog. Anchors may be added or modified at any point; however, only one anchor may be defined at a single point. Item #1: Available AutoPIPE online Help Example Methods for Modeling Anchors with related FAQ's. Item #2: How many supports at 1 node point constitutes an anchor? 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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Wiki Page: Modeling Approaches in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group AutoPIPE's Online help "Modeling Approaches" **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 AutoPIPE's Online help "Example Systems" This help has been provided in order to aid users in modeling more complex piping arrangements. Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Modeling Approaches> Example Systems Choose from the following topics: A. PipeSOIL Interaction: Transition Example B. Water Hammer (Time History) Example C. Steam Relief (Time History) Example D. Harmonic Analysis Example In addition, with AutoPIPE V8i 09.06.xx.xx and higher other example systems / tutorials documents can be found under: C:\ Bentley\ AutoPIPE V8i SELECTseries\ Documents (default installation folder): -> ASME_ND_With_HDPE_Support_Walkthrough_Rev2.pdf -> AUTOPIPE NEW FEATURES AND ENHANCEMENTS [V9.60 TO V6.20].pdf -> AutoPIPE Quick Reference.pdf -> AutoPIPE_ASME_NB_Example.pdf -> AutoPIPE_MSRS_Example1.pdf -> AutoPIPE_Tutorial.pdf -> Hot_Clash_tutorial.pdf -> Non_Linear_Load_Sequencing.pdf -> PIPELINK_tutorial.pdf -> ProjectWise Integration.pdf -> Quickstart_AutoPIPE.pdf -> StresISO_Troubleshooting.pdf -> Tutorial - Import Coordinates from Excel to AutoPIPE.pdf -> Tutorial - Soil Overburden and Seismic Wave Propagation in AutoPIPE.pdf -> Tutorial-ASME_B311_With_HDPE.pdf -> Tutorial-DNV-OS-F101-2012.pdf -> Tutorial - ISO 14692 FRP.zip -> Tutorial - HDPE with B31.1 -> Tutorial - HDPE with ASME ND Note: some of the files mentioned in these PDF documents are loaded with File> Open > AutoPIPE model (*.DAT) or File> Model Management> Open Archive> systemname.APC system commands. Modeling In AutoPIPE: The following list contains detailed information about specialized modeling techniques with AutoPIPE: Piping: Model Different Types of PIPING (i.e. Coated, Corroded, Corrugated, Jacketed, etc...) Model Different Types of PIPING Components (i.e Tee, Bend, Reducer, Flange, Flexible Joint, Valve, etc..) Model Non-metallic Plastic Piping (i.e. Plastic, PVC, PP, PPR, HDPE, PE, FRP, GRP, etc.) Model a Ring Main (circular header) Offshore and Underground Piping Model Subsea (Underwater) Piping Modeling Offshore Piping per BS8010 or CSAZ662 section 11 Piping Codes Model Soil Properties (Underground Piping) Equipment , Supports, and Structure Model Compressor piping Modeling Vessels/ Nozzle Model Supports & Beam (Frames) Model Anchors Load: Model Seismic Analysis Model Buckling Modeling Slug flow Model Concentrated Forces Model Wind Sway On A Pipe Rack Model Vacuum Piping Model Fluid Density Modeling Thermal Bowing Commands: Cut / Copy / Paste / Rotate / Move / Stretch Commands Miscellaneous Modeling approach to account for piping beyond scope of work area Apply More Than 1 Piping Code In an AutoPIPE Model 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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Wiki Page: 02. How many supports at 1 node point constitutes an anchor?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Problem: I have a single incline support modeled, If I want to arrest all the three global directions then I have to add two more Incline supports perpendicular along the horizontal directions with 0mm Gap. Instead of 3 individual supports could I insert just 1 anchor component to avoid these three supports..? Also, how many supports at 1 node point constitutes an anchor? Answer: Open any support dialog screen and press the Help button. The Help information for supports will appear, showing a grid listing each support used in AutoPIPE with a description and respective bearing directions. A support may be added at any point in the piping (or framing) system, and more than one support is allowed at a point. Knowing this, combine supports as needed to mimic your piping support in AutoPIPE. To answer the specific question above, assuming the pipe is on a global axis, an incline support bearing direction is user specified. One solution would be to add an incline support for each global axis direction, and yes, another solution would be to insert a single anchor with Trans. Stiff. set as needs and Rot. Stiff. set = 0.00 in all 3 directions. Or insert Rot. Stiff. values if it was decided to also control rotating resistance. Another option would be to add a single guide support with 0.00 gaps in all directions and Line stop with 0.00 gaps in all directions. An anchor can be represented by 6 individual AutoPIPE supports: 1. incline on global X-axis 2. incline on global Y-axis 3. incline on global Z-axis 4. Rotation on global X-axis 5. Rotation on global Y-axis 6. Rotation on global Z-axis 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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Wiki Page: Modeling Support and Beam Structures in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Select Support from the Insert or Modify menu to display the Support dialog. A support may be added at any point in the piping (or framing) system, and more than one support is allowed at a point. Once the "Support Type" is specified, the dialog is updated to provide additional fields which are unique to the type of support requested. With an AutoPIPE model loaded, open a the support dialog screen and press the " Help " button. The table will provide detailed information about the 9 different support typs including bearing direction, and support options for each type of support. From the online help, only when the first support is entered into a model does the dialog have any default values. Each successive support inserted afterwards, the dialog recalls the previous settings. Item #1: Different Type of supports in AutoPIPE Item #2: Available AutoPIPE online Help Example Methods for Modeling Supports with related FAQ's. Item #3: Beam Structure modeling in AutoPIPE Item #4: General FAQ's about Supports and Beams in AutoPIPE
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Wiki Page: 07. Modeling the same beam 3 different ways in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Problem: Depending on the methodology for modelling a beam to beam T intersection results in a difference in natural frequency results. Displacements also vary but are within a margin of error. Is there any reason Why are the results are not exactly the same between following modelling methods? Beam A: Beam B: Beam C: (made of 2 beams, C and C-1) Answer: Based on some observations from reviewing a model with the aforementioned beams and interpreting the online help: The ‘Rigid length’ is deducted from the geometrical length of the beam for the analysis. With shortened length, the mass and stiffness are different (compared to full length). Instead of using the ‘Rigid length’ at each end of the beam, one could physically create different beams corresponding to those rigid lengths at each end and mark them as ‘Offset’ beams. As a result, the ‘offset’ beam length is treated as rigid length. Note that static analysis is affected by differences in stiffness properties due to different lengths and different material properties. Shorter length means smaller mass which is adds to the differences in mode frequency. The stiffness in the anchor and stiffness in the beam is different. (see Beam properties, and Tools> Model options> Edit> Anchor Stiffness. As seen in AutoPIPE's online help: 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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Wiki Page: 03. Beam Structure modeling in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 Overview The mass and flexibility of structural supports can have a profound impact on the piping stress analysis. In many instances, if the support structure deflects only a fraction of an inch, it can affect piping moments to the extent where hangers can be eliminated, and/or piping loads on equipment nozzles and supports can be significantly altered. In addition, consideration of structural support flexibilities changes the natural frequencies of the piping system. Modeling pipe/structure interaction as part of piping stress analysis Despite the fact that structural support flexibilities can have a significant impact on piping loads and stresses, most piping engineers do not consider these flexibilities in their piping stress, analysis. Typically, structural supports are modeled as simple supports such as rigid guides, vertical stops, line stops, etc. with no consideration given to the flexibility of the support itself. Although AutoPIPE allows engineers to input a stiffness as part of the support element, the piping engineer often does not have convenient access to structural support details needed to calculate support stiffness'. As a result, the support is typically treated as rigid. As an alternative to using simple supports, AutoPIPE enables engineers to easily build the support structure into the piping model in order to consider pipe/structure interaction. The structural modeling is done within the piping model itself and takes advantage of AutoPIPE's graphical user interface, Using AutoPIPE's ability to graphically copy & paste between separate jobs or within the same job, users can now create libraries of common support structures and paste them into their new model in seconds . We will explain later AutoPIPE's unique abilities in defining the relationship between piping and structural steel. AutoPIPE users are riot burdened with going back and forth between separate programs or batch files to model support structures. Currently, AutoPIPE supports the American Institute of Steel Construction cross, sections as well as a material properties library for common structural steel materials. Once a cross section has been interactively selected, the user immediately sees the cross sectional properties with moments of inertia from the AutoPIPE structural database as well as the steel material properties. Nonstandard cross sections or cross sectional properties for International steel shapes can be entered as nonstandard or saved in the AutoPIPE database. AutoPIPE's structural steel analysis provides beta angle options, moment releases for pinned joints, and rigid end length options. Users see the structural model graphically as it is being built. Once the support structure has been created, users can define the connection between piping and structural steel using one of AutoPIPE's 2 point supports such as a guide or a vertical stop. A user can, for example, define the support connection between node B10 on his piping system and node 21 on his support frame by connecting them with a guide from B10 to 21. From there, the user can place gaps in any direction in the event that the pipe would lift off or move, and can also input friction. The flexibility of the support structure, including friction loads, will then be considered as part of the piping analysis. In addition to piping analysis results, users can also review beam deflections, beam forces and moments. Comments, Questions, and Answers about modeling Beam / Frames In AutoPIPE Item #1: How to insert a beam into an AutoPIPE model questions related to: a. Beam Properties dialog b. Insert Beam dialog Item #2: How to model piping held by 2 rigid beam structural supports members Item #3: How to model a vertically pipe supported by a Pipe clamp and spring supports as shown below: Item #4: How to model a U-bolt in AutoPIPE : Item #5: How to Model Equipment Supported by Steel and Springs? Item #6: How to model a Trunnion welded structural pipe support in AutoPIPE? Item #7: Modeling the same beam 3 different ways in AutoPIPE 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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Wiki Page: 03. Model Vertical Rod support in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE 09.06.01.10 Problem: How to model a vertical Rod support in AutoPIPE? Answer: Attention: Be sure to review, AutoPIPE help section: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Support> Rod support. When modeling any type of support in AutoPIPE it best to understand the functionality of all the support types in AutoPIPE. Therefore please see the following AutoPIPE help section: Help > Contents> Contents Tab> Command Reference> Component Reference >Support > Supports Overview. Here you will see a grid of each support with relative support options, and support's Bering direction (vital information). Now that you understand this data, let us put it to work creating a Vertical Rod support. Now, describe the support your trying to model: 1. what is the functionality of a vertical rod support? answer: mainly to support a pipe in the vertical direction 2. what kind of gaps does a vertical rod support have? answer: No gap down, may or may not have a small gap above the pipe, able to move laterally, able to move axially. With this information add as many AutoPIPE support at the same node point to achieve this support requirement. From the online help chart mentioned above find Step #1, insert a support at the pipe node point by using the toolbar button or Insert> Support menu command. On the support dialog screen, change Support Type = V-Stop, enable the Rod Hanger check-box, modify any additional settings as needed (see online help for details on each setting), and press OK button to insert the support. Do we need to add any other support at this location or does this single support meet our requirements above? Answer: No other support are required as a V-stop: a. Assumed rigid in the downward direction with gap = 0. b. Assumed rigid in the up direction after the gap above, 0.25 inches closes. c. Able to move lateral as the bearing direction is Vertical only. d. Able to move axial as the bearing direction is Vertical only. Complete support will look like this: Note: see the following link to model Pendulum swinging motion: Model pendulum swing of a pipe on a rod support in AutoPIPE 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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Wiki Page: 01. Different Types of Supports In AutoPIPE?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Modeling Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 AutoPIPE has 9 different types of pipe supports. Note: Please see the following AutoPIPE help section to see a grid and hyperlinks that completely describes each type of support and their respective bearing directions: Help > Contents> Contents Tab> Command Reference> Supports: From AutoPIPE's online help: A support may be added at any point in the piping (or framing) system, and more than one support is allowed at a point. Once the "Support Type" is specified, the dialog is updated to provide additional fields which are unique to the type of support requested. Suggest to continue reading AutoPIPE's online help for Support Considerations, Support Notes, Spring Hanger Related Topics, Guide-Related Topics, Modeling Examples , etc... Comments Questions and Answers about each AutoPIPE Support type Select the hyperlink below: a. Spring b. Constant c. V-Stop d. Incline e. Line Stop f. Guide g. Rotation h. Damper i. Tie/Link 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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Forum Post: AutoPIPE's PCF Translator Highlights & Features
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Wiki Page: 04. Why are my Hydrotest results so high in AutoPIPE?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 Problem: Why are my Hydrotest results so high? Answer: Typically a hydro test is run at ambient temperature. B sure to check your Hydrotest load case configuration, see example below: In this example, Test temperature is set to T1. In some models, user set up a load case (i.e. T1) as their initial operating condition before the system is subjected to higher operating conditions. Regardless, review the Test Temperature Case that was specified on the dialog to be sure that temperature setting for all node points in the model are correct. Sometime, users have selected the wrong Temperature Load Case (ex. T4 instead of T2) on this dialog or that the Temperature is not uniform for the entire model (ex. node points L00 - M13 was set to 700 deg F instead of 70 deg F), all of which will cause wrong Hydrotest results. Furthermore, be sure that the Factor is as expected and not set to a higher value then inteded (default - 1.0). In addition, regardless if you have a ambient temperature case or not, setting Test Temperature Case = None, will use the temperature from the General Model Options dialog. Confirm this setting to be correct: 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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Wiki Page: 03. Why does the Hydrotest case show an Allowable K Factor of 0.9 in AutoPIPE?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 Problem: Why does the Hydrotest case show an Allowable K Factor of 0.9? Answer: Please see the following AutoPIPE help section: Help > Contents> Search Tab> enter "Hydrotest Loads" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information. 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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Wiki Page: 02. Is there a method to perform a Hydrotest as a non-linear analysis in AutoPIPE?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 Problem: Is there a method to perform a Hydrotest as a non-linear analysis? Answer: Please see the following AutoPIPE help section: Help > Contents> Search Tab> enter "Hydrotest Loads" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information. 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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Wiki Page: 01. Why are my V-stops not allowing lateral movement during a Hydrotest load case in AutoPIPE ?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Sept 2013, AutoPIPE V8i 09.06.00.15 Problem: Why does the Hydrotest case show an Allowable K Factor of 0.9? Answer: From AutoPIPE online help: A non-linear static analysis cannot be performed on the hydrotest load case i.e. friction, support gaps and soil yielding are ignored.rotest Loads" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information. Update: AutoPIPE V8i 09.06.01.10 and higher: From AutoPIPE online help: Hydrotest Non-linear Method To enable hydrotest with gaps and friction, check the 'Non-linear' option for hydrotest load set in analysis sets dialog. 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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Wiki Page: 02e. "Hydrotest" - AutoPIPE Load Case
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Loads Subarea: Original Author: Bentley Technical Support Group The Load> Hydrotest command enables the user to define the hydrotest conditions of a piping system. A hydrotest is a common method for testing the integrity of a piping system before it is put into service. In this test, the piping system is filled with pressurized water and checked for leakage, etc. The Hydrotest option permits a simulation of this scenario. Please note that the AutoPIPE Hydrotest option automatically converts all spring hangers into rigid supports to simulate the holding pin which is still in the spring hanger during the hydrotest. Comments, Questions, and Answers Item #1: Why are my V-stops not allowing lateral movement during a Hydrotest load case? Item #2: Is there a method to perform a Hydrotest as a non-linear analysis? Item #3: Why does the Hydrotest case show an Allowable K Factor of 0.9? Item #4: Why are my Hydrotest results so high? Item # 5: H ow to apply the Hydrotest load and analyse it in the new version of AutoPIPE V8i 09.06.01.10? 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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Wiki Page: 05. How to apply the Hydrotest load and analyze it in the new version of AutoPIPE V8i 09.06.01.10?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Sept 2013, AutoPIPE V8i 09.06.00.15 Problem: How to apply the Hydrotest load and analyze it in the new version of AutoPIPE V8i 09.06.01.10? Answer: Please see the following file installed with AutoPIPE V8i 09.06.01.10: C:\Bentley\AutoPIPE V8i SELECTseries5 Maintenance 1\Documents \ Hydrotest Tutorial_rev_6.pdf 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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Wiki Page: 02f. "Static Earthquake" - AutoPIPE Load Case
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: loadcase Subarea: Original Author: Bentley Technical Support Group Comments, Questions, and Answers about Static Earthquake Load Case In AutoPIPE Item #1, Question: Can the seismic input be explained again in the new version of AutoPIPE V8i 09.06.xx.xx and higher? Answer : Start by selecting load> Static Earthquake. By default there is already 1 seismic load case E1, using the mouse change the Seismic Code from User to ASCE 2010, Using the mouse, select the gray box on the left hand side of E1 to highlight the entire row, and press the Modify Selected button: Fill in the fields as required, see online help for details on all fields. Press OK button to enable the application to calculate the gravity factors to be applied to the model for the active load case. Press the New button as required to add additional load cases. Note: A maximum of ten (10) earthquake load cases can be used in a model at any one time. Note: the information in AutoPIPE was gathered from the USGS earthquake hazard maps and Data website Item #2, Comment: A real world seismic response of the piping system is probably somewhere between a linear and non-linear behavior since pipes may jump off supports and friction is no longer present So running a non-linear and a linear analysis then finding the maximum loads between the 2 results may yield the most real world results. Item #3, Comment: When using "ASCE 2010" Seismic Static Load Generator, The component response factor Rp is an important factor for calculating the seismic ground acceleration. Rp = 12 is common for stress, but ASCE-2010 paragraph 13.4.1. states that for supports/structure reactions to use a value NOT higher than 6: One Recommendation is to run 2 sets of seismic cases Rp = 6.0 (Support & Anchor Reactions) Rp = 12.0 (Pipe stresses) Item #4, Comment: Depending on your type of analysis (i.e. Linear or Non-linear) there are options for load case combinations: Linear Analysis: On the Combinations dialog, select the "Combination Options" button, and place a check mark next to "Add Negative Occasional Cases", From the online help: If this option is selected, the program will generate default Non-Code combinations for negative occasional load cases in addition to the default Non-Code combinations for positive occasional load cases of seismic and wind only, i.e. GRTP1+W1, GRTP1-W1, GRTP1+E1, GRTP1-E1, etc. The default state is unchecked. This option will be disabled (grayed out) if the "Add default Non-Code combination" option is unchecked or if the static analysis = non-linear. Some behaviors: • Disabled when 'Disable Auto Non-Code Combination' checked • Always Enabled for B31.8, B31.4 Offset, B31.8 Offset, CSA Z662 Offset • KHK (Enabled only for level 2) • All other codes (Enabled when one or more load sets are linear) Non-Linear analysis For static seismic cases we recommend a minimum of 8 cases as shown here which will provide the accurate non-linear support load combinations and occasional code stresses. Define minimum of 8 static seismic cases: +/- X +/- Y (4) and +/- Z +/- Y (4) where Y = Vertical Note: You would typically use OP1 as the initial state. Seismic loads at the load case level e.g. E1, E2 etc are combined as load vectors algebraically to get a resultant loading. Horizontal X and Z seismic loads are typically not combined in the same load case. Seismic guidelines recommend analyzing two non-concurrent horizontal seismic loadings. It is common to consider separate loadings for X and Z directions in different load cases E1 and E2 both with vertical Y component. So only cases SUS +E1 to SUS +E8 need to be considered for occasional stress compliance. Item #5, Comment For most tall structures, the greater seismic accelerations occur at the top of the structure / building. We can use the AutoPIPE's Insert> Xtra Data> "Member Static Earthquake factors " or " Point Static Earthquake factors " commands to model the increased seismic accelerations upward through the building / supporting steel structure. Typically component amplification between 1 and 2.5 Item #6, Comment: What is the recommended Seismic support spacing? Answer: MSS SP-127-2001 (Bracing for piping Systems Seismic - Wind - Dynamic) recommends a lateral seismic support every 40ft and longitudinal support every 80ft. But just note this guideline tends to be conservative and over predict number and size of seismic supports. Item #7, Question: In my project, there are piping systems that must be analyzed based on code calculations (i.e. Boiler piping, etc. ) and other systems that are called BOP (Balance Of Plant) piping that is non-crucial piping that has lower specifications for analysis than other code required piping. As such the Seismic G factors are different for these different systems. So How can I apply the correct G factor in our model? Answer: Please consider using 1 of the following options: Option #1: If the piping is not connected to gether and are really disconnected systems. Recommend that they be analyzed in different models with different settings as needed. Option #2: When using Load> Static Earthquake, the "G" force is applied to the entire model. There is no way of dictating different static earthquake loads factors to specific piping segment support. Option #3: Apply the earthquake as a MSRS ananlysis. See the following file that was installed with AtuoPIPE on your computer: C:\ Bentley\ AutoPIPE V8i SELECTseries\ Documents\ AutoPIPE_MSRS_Example1.pdf This is a good tutorial on how to perform a MSRS on a piping system. You would group the supports for one type of piping system into one support group, then all the other piping system supports into another support group, and apply the different responses as needed. Item #8: Gravity + thermal + User load cases added together give incorrect results on support in AutoPIPE, why? 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! Gravity + thermal + User load cases added together give incorrect results on support in AutoPIPE, why?
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Wiki Page: 08. Gravity + Thermal + User load cases added together give incorrect Restraint Report results in AutoPIPE, why?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 Problem: To summarize, I have a gravity case, a thermal case, and a user case. My gravity case, for example, shows a -1224 pound force acting on my v-stop (compression only) support. Both my thermal and my user case actually cause the valve that is being supported to lift up. If I look at the Thermal case, I observe a "fake" reaction load of +1224 pounds at the v-stop. I understand the purpose of this is so that when Gravity + Thermal are actually added together, the net reaction force is 0 pounds. The same situation occurs with my User case (a fake reaction load of +1000 pounds). The problem that results from this is when I combine Gravity + Thermal + User 1. Th e resulting reaction force at the v-stop is a +1000 pound force. Thus, this turns my compression only support into a tension support as well, but only up to the magnitude of the gravity reaction. I don't foresee this drastically changing my analysis, but it does present inaccurate loading in my supporting frame. Answer: T here is no indication if this model is being run as a Linear analysis or Non-Linear analysis. Assuming non-Linear analysis as the pipe is clearly moving off the support, suggest that you modify the "Initial case for Occ. loads" from Gr to OP1...OPn. Under Load> Static Analysis results> See column labled "Initial State Occasional", set this value to OP1 - OPn (select a value other than GR). Re-run your analysis and review your results. See AutoPIPE Help for details on this command. 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! Initial case for Occ. loads
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Wiki Page: 03. Gravity + Thermal + User load cases added together give incorrect Restraint Report results in AutoPIPE, why?
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Subarea: Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 Problem: To summarize, I have a gravity case, a thermal case, and a user case. My gravity case, for example, shows a -1224 pound force acting on my v-stop (compression only) support. Both my thermal and my user case actually cause the valve that is being supported to lift up. If I look at the Thermal case, I observe a "fake" reaction load of +1224 pounds at the v-stop. I understand the purpose of this is so that when Gravity + Thermal are actually added together, the net reaction force is 0 pounds. The same situation occurs with my User case (a fake reaction load of +1000 pounds). The problem that results from this is when I combine Gravity + Thermal + User 1. Th e resulting reaction force at the v-stop is a +1000 pound force. Thus, this turns my compression only support into a tension support as well, but only up to the magnitude of the gravity reaction. I don't foresee this drastically changing my analysis, but it does present inaccurate loading in my supporting frame. Answer: T here is no indication if this model is being run as a Linear analysis or Non-Linear analysis. Assuming non-Linear analysis as the pipe is clearly moving off the support, suggest that you modify the "Initial case for Occ. loads" from Gr to OP1...OPn. Under Load> Static Analysis results> See column labled "Initial State Occasional", set this value to OP1 - OPn (select a value other than GR). Re-run your analysis and review your results. See AutoPIPE Help for details on this command. 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! Initial case for Occ. loads
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Wiki Page: "Restraint" Sub-report of the Output Report in AutoPIPE
Applies To Product(s): AutoPIPE, Version(s): 2004, XM, & V8i Environment: N/A Area: Reports Subarea: Original Author: Bentley Technical Support Group Comments, Questions, and Answers for "Restraint" sub-report of the Output Report in AutoPIPE Item #1: Can i print a "max load" report for restraints? Answer: Yes, after you create a new user defined non-code combination, under Tools> Model Options> Combinations> Non-Code Comb tab> where the combination method = ABS Max or Sign MAX, to evaluate up to 10 selected combination names at one time. . Item #2: When reviewing the load on a gaped restraint, there is a load in the same direction as a large gap. The pipe never closes the gap, so why is there a load on the restraint in that direction? Answer: If you are running a non-linear analysis, 9 times out of 10 time, the answer is due directly with Load sequencing. Please see the following WIKI page here Item #3: Gravity + Thermal + User load cases added together give incorrect Restraint Report results in AutoPIPE, why? 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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