AutoPIPE CONNECT edition 12.1 - (1 issues) 12.0 - (5 issues) 11.4 - (6 issue) 11.3 - (2 issue) 11.2 - (none) 11.1 - (8 issue) 11.0 - (8 issues) 10.1 - (13 issues) 10.0 - (13 issues) AutoPIPE V8i edition v.9.6 - (19 issue) v.9.5 - (16 issue) v.9.4 - (14 issues) v.9.3 - (37 issue) v9.2 - (38 issues) v9.1 - (15 issues) AutoPIPE XM edition v.9.0 - (4 issues) v.8.9 - (4 issue) AutoPIPE 2004 edition v.8.6 - (5 issues) v.8.5 - (18 issues) AutoPIPE 6.3 and lower v6.0 - v6.3 - (55 issues) v5.x and lower - (12 issues) See Also Known Issues in AutoPIPE (Enhancements, defects, etc..)
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Wiki Page: Critical and High issues fixed and released in version of AutoPIPE:
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Wiki Page: Q. How to gather AutoPIPE user's computer information?
Note: 1. You may need internal IT assistance to provide user access when following the procedures below. 2. These files may be large and can be shrunk by adding it to a ZIP file. 1. Computer's system information: 1) Start> Programs> Accessories> System Tools> System Information. 2) After the program has been opened, select File> Save> save file 3) Send me a copy of systemname.NFO file for review. 2. Folder listing of files installed 1) Start DOS command, select Start> Run> type "cmd" 2) Type, cd .. until c:\> is shown 3) Type, c:\> Dir /s /o /ogne>systemname.txt 4) Send a copy of the systemname.txt for review 3. List all of the installed programs on your Windows 10 computer (as needed..) 1) Launch the Command Prompt by typing Command Prompt into the search box on the menu bar 2) Right-click the app returned and select Run As Administrator 3) At the prompt, specify wmic and press Enter 4) The prompt changes to wmic:root\cli 5) Specify /output:C:\InstalledPrograms.txt product get name,version and press Enter 6) Close the Command Prompt 7) Open the InstalledProgramsList.txt file in Notepad++. The Name and Version of every program installed on your computer are presented in table format.
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Wiki Page: 01. Different Types of Supports In AutoPIPE?
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: Note: Bearing Direction refers to what axis a support's stiffness will act in. Like a spring, support stiffnesses (ex. Rigid, 100 N/mm, etc..) will only act in the direction specified by the chart above for the respect Support type. When referring to a V-stop, the bearing spring stiffness is Rigid and only acts in the Vertical direction regardless of the modeled pipe slope. 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 j. Continuously supported How to model this type of support: Select image below for detailed instructions: 1. Insulated Pipe Support 2. Sway Brace support 3. Bell foot type concrete supports in Soil 4. Pipe Rack support 5. Roller Support See Also Modeling Support and Beam Structures Bentley AutoPIPE
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Wiki Page: 01. How to model a insulated pipe support in AutoPIPE?
Applies To Product(s): AutoPIPE Version(s): All Area: Modeling Original Author: Bentley Technical Support Group Date Logged & Current Version Oct. 2015 09.06.02.06 Problem: How to model a insulated pipe support like this in AutoPIPE? Solution: First is to understand the various types of supports available in AutoPIPE and how to best combine them to reflect this type of support. Keep in mind the way that this support functions: 1. The pipe is fist supported by the insulation between the pipe and the actual Steel support. This insulation has a different support spring rate and friction than the steel support. 2. The insulation is then held in place by the actual steel support. The steel support has its own support spring rate and friction. 3. Can we assume that the Insulated Steel support is attached to rigid ground or model it attach to additional Steel beams that are then supported by the ground. As one can see there are 3 stages to this support approach. Let us build this support starting from the ground with the following assumptions: a. Insulated support is connected to ground, no elaborate support frame/structure to be considered. b. Insulation thickness is 3 inches thick Step #1: Give the following model: The Insulated support will span from A02 - A06 Step #2: Insert the steel beam that is the backbone of the insulated support, from M01 to M03 (assign a beam property in close approximation of the insulated support steel or rigidity). Step #3: Point M2 is assumed to be connected to ground. Insert a short vertical beam and add an anchor at the end. Step #4: Insert the steel supporting the insulation. In this example, the insulated support spans from A02 - A06. a. Make A02 the active point. b. Insert a guide support, connected to M1, with gap = 3" in all directions, Support Stiffness = Rigid, and Friction = your calculations. c. Repeat steps A & B at node point A06 connecting to M3 Step #5: Insert insulation that is supporting the pipe. What ever insulation used will have a manufacture reference for support force. Convert this to a spring rate and add to a support a. Make A02 the current node point. b. Insert a guide support, connected to M1, with gap = 0" in all directions, Support Stiffness and Friction = your calculations. c. Repeat steps A & B at node point A06 connecting to M3. Note: the 2nd support at node A02 and A06 are highlighted. As can be seen above, the are 2 supports at these points, One is colored Red, the Second is colored Green. Are intermediate support required? Review the output report for the intermediate support locations (ex. A03 - A04 - A05). If these nod points are moving in an direction more so then the ends (ex. A02 & A06. Then consider one of the following: a. Insert rigid properties over range (ex. A02 to A06) with both options enabled. b. Insert additional intermediate supports as performed above. Conclusion: In this modeling technique, the 1st set of guide supports at A02 and A06 has the same properties as the insulation. if a force strong enough to crush the insulation is applied, the pipe will be allowed to move until it reaches the gap distance set by the 2nd set of guide supports at A02 and A06. All 4 of these supports are connected to the horizontal beam M1-M2-M3. These set of beams represent the structural integrity of the insulated support mentioned in the manufacture literature. Finally, all this is connected by a short beam (M2 - M4) to ground. Note, overall modeling assembly of all the supports with regards to weight, friction, rigidity, etc. totals should be as close to that of the actual insulated support manufacture literature. Be warned about any double counting errors in calculations and modeling. See Also Different Types of Supports In AutoPIPE? Guide support modeling - WIKI posting Bentley AutoPIPE
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Wiki Page: 03c. Modeling Support and Beam Structures in AutoPIPE
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 Item #2: Help Example Methods Item #3: Beam Structure Item #4: General FAQ's about Supports and Beams See Also Modeling Approaches Bentley AutoPIPE
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Wiki Page: 02. Available AutoPIPE Help Example Methods for Modeling Supports with related FAQ's.
Item #1: Straight Pipe Supports Item #2: Elbow / Bend Pipe Supports Item #3: Spring Hanger Pipe Supports Item #4: Beam / Frame Structure and Supports See Also Modeling Support and Beam Structures Bentley AutoPIPE
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Wiki Page: 01. Straight Pipe Supports Modeling Examples in AutoPIPE
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 Model 1: Saddle Support 1. if the saddle support significantly restrains the pipe from moving in the lateral direction, model with high friction value OR as a Support Type = "Guide" with large gap on top and 0.00 gap left / right / bottom. In addition set guide friction value for axial movement resistance. Model 2: Trunnion Support 1. Model a Trunnion pipe support Model 3: Rod Support 1. Model Vertical Rod support 2. Model pendulum swing of a pipe on a rod support Model 4: Pedestal with Rigid Strap no questions on have been submitted for this support example Model 5: Rigidly Guided Pipe Slide Assembly no questions on have been submitted for this support example Model 6: Sway Strut no questions on have been submitted for this support example Model 7: Spring Can with Friction no questions on have been submitted for this support example Model 8: Pipe supported by being encased in a concrete block 1. Model pipe encased within a concrete block See Also Available AutoPIPE Help Example Methods for Modeling Supports Bentley AutoPIPE
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Wiki Page: 04. Beam / Frame Structure and Supports Modeling Examples in AutoPIPE
Frame structures are commonly used to support piping systems. In most cases, the structure is assumed to be much stiffer than the piping itself and can be modeled simply as a rigid support. However, AutoPIPE also allows a supporting frame structure, such as a pipe rack, to be included in the system model. AutoPIPE online help has the following 3 Pipe Rack example systems available for review, Inside of AutoPIPE select: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Frames> Note: see each support example and related questions below Pipe Rack (Method 1) no questions on have been submitted for this support example Pipe Rack (Method 2) no questions on have been submitted for this support example Pipe Rack (Method 3) no questions on have been submitted for this support example See Also Available AutoPIPE Help Example Methods for Modeling Supports Bentley AutoPIPE
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Wiki Page: 03. Spring Hanger Pipe Supports Modeling Examples in AutoPIPE and FAQ's
AutoPIPE help has the following Hangers support example systems available for review, Inside of AutoPIPE, select: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Hangers> Note: see each support example and related questions below Variable and Constant Force Hangers no questions on have been submitted for this support example Imposed Hanger Displacements no questions on have been submitted for this support example Multiple Hanger Arrangements no questions on have been submitted for this support example Two-Point Hanger Model 1: Connected-to Points are Vertical no questions on have been submitted for this support example Model 2: Connected-To Points are Not Vertical no questions on have been submitted for this support example In addition, there is a modeling approach to incorporate friction with a spring hanger. See the following AutoPIPE help location: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Supports> Model 7: Spring Can with Friction: no questions on have been submitted for this support example Comments, Questions, and Answers about modeling Spring Supports in AutoPIPE Item #1: Can AutoPIPE model friction at a spring support? See Also Available AutoPIPE Help Example Methods for Modeling Supports Bentley AutoPIPE
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Wiki Page: 02. Elbow / Bend Pipe Supports Modeling Examples in AutoPIPE
AutoPIPE online help has the following 5 elbow support example systems available for review, Inside of AutoPIPE select: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Bends> Base Supported Elbow> Note: see each support example and related questions below Model 1: Supported at a tangent point no questions on have been submitted for this support example Model 2: Supported at a point along the bend no questions on have been submitted for this support example Model 3: Alternate method for defining a support at a midpoint no questions on have been submitted for this support example Model 4: Modeling a "dummy leg" as a structural member no questions on have been submitted for this support example Model 5: Modeling a "dummy leg" as a pipe no questions on have been submitted for this support example See Also Available AutoPIPE Help Example Methods for Modeling Supports Bentley AutoPIPE
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Wiki Page: 05. How to model a Roller Support in AutoPIPE?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Date Logged & Current Version Oct. 2017 11.01.00.23 Problem: How to model a Roller Support in AutoPIPE? Solution: Typically used for support of piping where axial movement due to expansion and contraction often occur. The roller reduces wearing of support or pipe surfaces that would otherwise be worn away due to direct rubbing of metal surfaces against one another. Roller supports are available in a many different configurations to meet design criteria. List out the design criteria of your roller support? a. Axial movement b. Lateral movement c. Vertical movement d. Rotational movement How to model this type of roller support? Identify the support criteria: a. Axial restraint - minimal amount of resistance due to the roller. b. Lateral restraint - the cradle caused by the curve of the roller where the pipe sits provide a minimal amount of lateral restraint. With a certain amount of lateral force, the pipe can easily pop out of the cradle area and have no resistance to movement. c. Vertical restraint - able to move up but cannot move down d. Rotational restraint - essentially no rotational restraint in any direction In AutoPIPE insert a support, on the support dialog, select the Help button. Here the user will see a chart of all the different type of supports and respective bearing directions the can be used in the program. Using one or more supports together, model the support: Option #1: Model as a V stop with Large gap up, with small friction factor Option #2: Model as an Incline with large gap up, with small friction factor Option #3: Model as a Guide support with the appropriate gaps in all direction and small friction factor In actuality, roller supports by themselves provide a small amount of lateral restraint due to the shape of the pipe roller. As of Aug 2018, there are no supports in AutoPIPE that have a break-away force settings. Therefore using option #1 or #2 above assumes that the pipe is free to move on the horizontal plane with only friction restricting movement. If using option #3, user is able to set a support gap limiting lateral movement but pipe will be free to move on the horizontal plane with only friction restricting movement until a support gap closes. See Also Different Types of Supports Bentley AutoPIPE
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Wiki Page: 05. How to Model Equipment Supported by Steel and Springs?
Applies To Product(s): AutoPIPE, Version(s): All Area: Modeling Original Author: Bentley Technical Support Group Problem: I am modeling a pipe connecting to a pump which is sitting on an inertia block. How do I actually take into account the effects from the spring holding the pump base? Solution: Suggest the following modeling approach: 1. Model the pump with rigid pipe properties that does not consider weight. 2. Create base holding the pump using rigid beam components that does not consider weight. 3. Add the spring supports to the beam. 4. Use Insert Extra Data> Additional Weight as needed in the various locations that total the combine weight of the pump and base (hidden by vertical beam in image below). Note: this modeling technique can be applied to other scenarios besides pump supported base. See Also Bentley AutoPIPE
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Wiki Page: 04. How to model a U-bolt in AutoPIPE?
Applies To Product(s): AutoPIPE, Version(s): All Area: modeling Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8i 09.06.01.10 Problem: How to model a U-bolt (ubolt) in AutoPIPE? If the U-bolts are clamped tight can anyone tell me the proper way to model these supports? What friction factor should I use? Solution: This has already been answered on the AutoPIPE forum by Karim Rinawi: http://communities.bentley.com/products/pipe_stress_analysis/f/275801/t/80802.aspx and copied below for convenience: A U-bolt can be modeled as: a. A guide support type b. Combination of 2 or more incline type supports at the same node point An industry accepted friction factor value between 0.3 to 0.4 is commonly used for metal to metal contact at support locations unless low friction pads are added in which case 0.1 can be used (recommend contacting manufacture for actual friction coeff.). If the U-bolt is tight, then a non-metallic padding is usually added, otherwise the pipe will dent due to hoop radial expansion or the support will break due to axial growth. Most of the friction will come from horizontal surface where the weight is acting and so the above mentioned factors should be used. If the tightness is excessive, it can be expressed as an equivalent normal radial force (contact pressure*contact area) and that can be used to evaluate the friction factor by dividing the force by the gravity reaction. See Also Bentley 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 Area: Modeling 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) Solution: 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
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Wiki Page: 06. How to model a support that moves with the tank/vessel?
Applies To Product(s): AutoPIPE Version(s): ALL Area: Modeling Original Author: Bentley Technical Support Group Date Logged & Current Version Aug. 2015 09.06.02.06 Problem: How to model a support in AutoPIPE that is rigidly connect to a Tank / Vessel and prevents pipe from moving vertically down (support not rigidly connected to pipe). In addition, the support needs to move both vertically and horizontally with thermal expansion of the tank / vessel. Solution: See updated sketch below and the equivalent AutoPIPE model here to properly incorporate the thermal expansion of the tank and its effects on the supports. Assumed that the pipe was not welded to frame support. If welded then join the frame directly to pipe center instead of placing a v-stop. See Also Beam Structure modeling Bentley AutoPIPE
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Wiki Page: 08. How to model a Trunnion welded structural pipe support in AutoPIPE?
Applies To Product(s): AutoPIPE, Version(s): All Area: modeling Original Author: Bentley Technical Support Group Dec 2014, AutoPIPE V8 09.06.01.10 Problem: How to model a Trunnion pipe support in AutoPIPE? Solution: There a couple different methods to model a Trunnion pipe support in AutoPIPE. Consider using one or a derivation of the following methods: Option #1: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Modeling Approaches> Modeling Approaches> Support> Model 2: Trunnion Support Option #2: Model a rigid Beam that does not include weight from the center of the pipe to the outside surface of the pipe. From this point, add another beam with specific section properties to the actual support location (i.e. anchor component or another beam that is part of a structural support system built in the model). Option #3: Similar to the Option #2 above, but with Piping components. a. Insert a Tee component at the node point, Tee type = Other, SIF in/ out = 1.00. b. On the Tee Branch insert a run of pipe to the outside surface of the main pipe run c. Select this short run of Pipe, Insert> Rigid options over range> : Include Weight = unchecked (OFF) Include Thermal Expansion = checked (ON) Wire frame View below: d. From the node point located on the surface of the pipe, insert User SIF value representing the welded connection and insert a pipe run, using updated pipe properties, to the actual support location (i.e. anchor component or another beam that is part of a structural support system built in the model). e. At the pipe surface interface where the trunnion is connected to the pipe insert a Reference Point: AutoPIPE V8i 09.06.01.xx and lower: Insert> Xtra Data> Reference Point> with "Report Reference Points results to AutoPIPE Nozzle/AutoPIPE Vessel" option checked ON. With AutoPIPE Advanced or Nuclear edition, using File> Export> Nozzle Loads to AutoPIPE Nozzle> evaluate stresses of trunnion on pipe. See Also Beam Structure modeling in AutoPIPE Bentley AutoPIPE
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Wiki Page: 03. Beam Structure modeling in AutoPIPE
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 not 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. AutoPIPE incorporates Timoshenko beam theory for calculating the stiffness matrices. The assumptions associated with using these type of beam element are: i. Plane section remain plane but not necessarily perpendicular to the centerline of the beam ii. Effects of shear deformation are included iii. Only valid for small deformations (the cross section or properties of the beam are not affected by the deformations) iv. Only valid for stresses under elastic range (no plastic deformation) v. Modulus is considered the same in tension and compression The accuracy of an analysis with combined beam and piping will depend on the assumptions made for the small displacement theory and whether these assumptions would cause an error which is with acceptable limits: a. Displacement is small in comparison to the smallest dimension of the structure b. Rotations are small and square of rotations is much smaller than unity c. The strain is small and square of strain can be neglected d. The equations written for the un-deformed configuration of the structure can be assumed to be valid for the deformed configuration Comparison of the results for the simplest form of the problem (something like a cantilever beam), with results from another analysis incorporating more refined analysis method. If the error between the analysis results are within an acceptable limits, the results may be assumed to be within the limitations or within a range for which the results are acceptable. Some specific technical references / resources discussing the above topics which are relevant to how AutoPIPE has specifically implemented its beam element are available in AutoPIPE's Help> Reference Information section>. SAP IV technical manual is available online, which acted as the basis for AutoPIPE analysis engine. The general implementation for the stiffness matrix for the Timoshenko beam theory is available in text books, consider online search for these texts.. Limitations: For a complete list of beam limitations in a specific version of AutoPIPE, see the following AutoPIPE help section: Help > Contents> Contents Tab> Bentley AutoPIPE> Command Reference> Insert command> Structure Group> Adding, modifying, and deleting beams Note: for all other loading not listed under "Beam Members CANNOT" will be applied to beams structures. Also, recall that for some loads such as Static Seismic and Response spectrum, these loads are applied to Support and Anchor components. Therefore, like pipe, Beams and Beam structures will be affected by these loads through Support and Anchor locations. Comments, Questions, and Answers about modeling Beam / Frames In AutoPIPE Item #1: Insert a beam questions related to: a. Beam Properties dialog b. Insert Beam dialog Item #2: Piping held by 2 rigid beam structural supports members Item #3: Vertically pipe supported by a Pipe clamp and spring: Item #4: U-bolt Item #5: Equipment Supported by Steel and Springs Item #6: Support moves with the tank/vessel thermal growth Item #7: Model beam 3 different ways Item #8: Trunnion welded structural pipe support Item #9: Trapeze / Beam support Item #10: Vertical vessel held in place by 4 supports See Also Bentley AutoPIPE
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Wiki Page: 07. Can a technical justification be provided for ignoring Delta T2 variation whenever the maximum linear temp variation is negative?
Applies To Product(s): AutoPIPE Version(s): ALL Area: Analysis Original Author: Bentley Technical Support Group Date Logged & Current Version Jan 2015 09.06.01.10 Problem: For ASME Class 1 piping analysis, linear variation of through-wall tem perature is Delta T1, but non-linear variation is Delta T2. In Bentley's On Demand "AutoPIPE Nuclear Powered by ADLPIPE" Training Notes (Apr-11 version), whenever the calculated maximum magnitude of Delta T1 has a negative sign, the non-linear through-wall temperature variation is ignored, namely assign Delta T2=0 using the Operating Pressure & Temperature dialog (see page s 80, 121). Can a Technical justification be provided for ignoring non-linear through-wall temperature variation whenever the maximum linear temperature variation is negative? Solution: The short answer is No, there is no technical justification. The value is the minimum value for T2 calculated by the equation in ASME and it is applied with the minimum value or T1. Can the value of T2 be -ve…seems the equation cannot give a -ve value or if a -ve value should be considered. The question is for ASME, we would be very interested in their answer . See Also Bentley AutoPIPE
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Wiki Page: 01. When reviewing the code equation Equiv1, appears that the value is exactly the same as Hoop. Why is AutoPipe not considering the longitudinal term of the equation in 4.7.1. in AutoPIPE?
Applies To Product(s): AutoPIPE Version(s): V8i Area: Results Original Author: Bentley Technical Support Group Date Logged & Current Version Aug. 2015 09.06.02.06 Problem: For CAN-Z662 (2007), When reviewing the code equation Equiv1, appears that the value is exactly the same as Hoop. Why is AutoPipe not considering the longitudinal term of the equation in 4.7.1. In some cases there isn't any stress in the expansion cases, so this makes sense, however various nodes do have significant expansion stress, which is as much as or more than the hoop stress, however AutoPipe is still only reporting the hoop stress for Equiv1 results. Answer: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> CAN-Z662 (2007) From the online help: For those portions of restrained pipelines that are fully restrained axially, the equivalent tensile stress (seq) is calculated per the code in Section 4.7.1 as the maximum Tresca effective stress (refer to the discussions on Principal Stress and Maximum Shear Stress in the General Stress Calculations section of the Appendix), excluding bending stresses and shear stresses Principal Stress: The principal stresses are calculated considering the longitudinal stress (Sigma a), the hoop stress (Sigma h), and the torsional shear stress (Tau). from the following equations: In case of Z662 - Equivalent Tensile stress, the shear stress (Tau) is set to zero and there is no bending stress considered for longitudinal stress. If you enter shear stress as zero in equation above, you would get Where Sigma (a) is the longitudinal stress from pressure (P*Ap/As). AutoPIPE reports the maximum stress as: In cases where the net longitudinal stress comes out as a positive value (tension), the maximum stress would be either Hoop or Longitudinal Stress and not (Sigma 1 - Sigma 2). We can relate this to the note provided by the code: In cases where the axial stress due to axial forces by Gravity, Pressure and thermal expansion are high, the net longitudinal stress would become negative and then we will see a value of equivalent tensile stress which is greater than the hoop stress. See Also Bentley AutoPIPE
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Wiki Page: 02. The longitudinal stress calculated following the program documentation does not match the results provided by AutoPIPE, why not?
Applies To Product(s): AutoPIPE Version(s): 2004, XM, V8i Area: Results Original Author: Bentley Technical Support Group Date Logged & Current Version Aug. 2015 09.06.02.06 Problem: The longitudinal stress calculated following the program documentation does not match the results provided by AutoPipe. Can you please provide hand calculations which match the AutoPipe results for a simple system (straight pipe)? How are does Autopipe calculate the longitudinal stress in the general output file when a SIF is applied. Solution: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> CAN-Z662 (2007)> Stresses Due to Sustained Loads (CSA-Z662 - 2007)> Case with Pressure Extension Cases and with Pcase in Sustained The longitudinal pressure term in the above equation highlighted in yellow is can vary from P= PD/4t, or A = AxF/area, or M = minimum of both, or set to N = 0.00. This is controlled by the following setting: Tools> Model option> Results> Long Pressure (P/A/M/N) option. Confirm that the correct form of this setting is used in the above equation. See Also Bentley AutoPIPE
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