Applies To Product(s): AutoPIPE Version(s): ALL; Area: Report Date Logged & Current Version April 2019 12.00.00.14 Problem: What is the equation of the total stress from the AutoPIPE output report ? Solution: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> General > Total Stress (General). See Also "General" Piping Code Calculation Bentley AutoPIPE
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Wiki Page: 02. What is the equation of the total stress from the AutoPIPE output report ?
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Wiki Page: "General" Piping Code Enhancements & Defects for AutoPIPE
Note: if an enhancement or defect has not been added to the program, log an Service request for that enhancement. The more requests logged per an enhancement, the quicker the CAE development team will add that feature to the program. The following enhancements and defects have already been requested: Defect 645856: General piping code cannot be selected in Standard edition Description: 1. Open AutoPIPE and select standard licensing version. 2. Create a new model 3. On General Model Options tab, Select 'General' in Piping Code drop down menu. 4. It does not get selected and a dialogue appears "Sorry, not available in this version" According to AutoPIPE Feature comparison document it should be selected for Standard version. Development Project : Scheduled for 11.2 CE Update 2 See Also Piping Codes Enhancements & Defects Bentley AutoPIPE
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Wiki Page: "General" Piping Code Enhancements and Defects for AutoPIPE
Note: if an enhancement or defect has not been added to the program, log an Service request for that enhancement. The more requests logged per an enhancement, the quicker the CAE development team will add that feature to the program. The following enhancements and defects have already been requested: Enhancement 682002 Add user allowable for General Pipe Stress Report Description: Each general stress combination will have its own user allowable stresses. Development Project: TBD See Also Piping Codes Enhancements & Defects Bentley AutoPIPE
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Wiki Page: HDPE CC N-755-1 Piping Code Calculation Issues in AutoPIPE
Note: Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> select a piping code to see the calculations performed by AutoPIPE. Comments, Questions, and Answers about HDPE Item #1: Explain this discrepancy of values used for HDPE in AutoPIPE compared to the Handbook of PE Pipe 2nd Edition? Item #2: Why is the HDPE material allowable 1100 psi in my AutoPIPE model? See Also Piping Code Calculations Bentley AutoPIPE
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Wiki Page: 05. Why are the CSA-Z662 Longitudinal stress calculation on the intermediate soil points over-stress in AutoPIPE's results?
Applies To Product(s): AutoPIPE Version(s): 2004, XM, V8i Area: Analysis Original Author: Bentley Technical Support Group Date Logged & Current Version Aug. 2015 09.06.02.06 Problem: Can you please elaborate as to why the Longitudinal stress calculation on the intermediate soil points results in over-stress? Are there any governing factors that AutoPIPE considers when calculating Equiv1 at a weld between 2 different pipe properties during AutoPIPE analysis of underground piping? Solution: The response is based on a specific user model, this may or many apply in your situation: a. The first and the obvious is that section modulus and cross sectional area of the pipe on both sides of the transition are different. This will affect the calculated longitudinal stress values and bending stress values even if the force/moment values remain constant on both sides of the transition. This effect is observable in the user model with sudden difference on the minus and plus face of the node at which the transition is occurring for example A138. b. The main axial force that develops in the user pipeline is due to thermal expansion. If two pipes say pipe1 with smaller wall thickness and pipe2 with larger wall thickness are both restrained at one end and free to displace at the other end – the displacement at the free ends of both the pipes will be the same if expansion and modulus of the pipes are the same. However, greater force will be required to prevent that displacement in case of thicker pipe as compared to the force required to prevent displacement of thinner pipe. With the two different section pipes connected together, pipe2 with larger wall thickness will be able overcome the opposing forces from the pipe1 with thinner wall and displace (contracting pipe1). c. If we look at the displacement and soil report – the maximum displacement value can be observed at the interface of the two pipes. The soil springs will tend to resist this displacement of the pipe – resulting in increased pipe forces at the locations with maximum pipe displacements. Also note that the pipe forces will increase until it reaches a point with zero axial displacement and a consequent change of direction of the pipe displacement. d. There are no specific factors that would govern the calculations of the stress value at such locations. For stress calculations, AutoPIPE will simply use the forces and moments values of the pipe and the pipe cross sectional properties to calculate the stress values. See Also Bentley AutoPIPE
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Wiki Page: 04. What is the reasoning for taking only gravity and thermal expansion bending moments into account for Equiv2 and not pressure in AutoPIPE?
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: What is the reasoning for taking only gravity and thermal expansion bending moments into account for Equiv2 and not pressure? If you have thermal expansion you have pressure as well. You can't just have thermal expansion without pressure. In your competitor's program they are taking bending moments from all cases into account (pressure, gravity and thermal). Solution: Pressure cases contain pressure extension/elongation forces and moments, which piping codes do not clearly require to be included in calculations. Longitudinal Pressure Stress component (P*Ap/As) is always included regardless of Pressure case being a part of the combination or not. Note: As = Cross sectional area of pipe, in2 Ap = Pressure area of pipe, in2 P = Design internal pressure, psi See Also Bentley AutoPIPE
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Wiki Page: 03. Does Equiv2 or Tensile 2 which captures the compliance to CSA Z662 Clause 4.7.2.1. only capturing the bending stresses due to thermal expansion in AutoPIPE?
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 main load case that we are concerned is Equiv2 or Tensile 2 which captures the compliance to CSA Z662 Clause 4.7.2.1. it is assumed that it is only capturing the bending stresses due to thermal expansion. Solution: We have investigated the issue and the user's observations are correct. AutoPIPE only adds the axial force due to pressure when pressure extension is enabled. The other forces and moments do not include the effects from pressure extension in the default code combination Equiv2 for CSA Z662 code. This is also true for other codes, and is by design. AutoPIPE B31.8 code may be an exception as it always includes a pressure case in the default code combination. To be able to include the effects of pressure extension other than the axial force, the user can include the desired pressure case in the default code combination for Equiv2. This will include the pressure extension effects to moments as well. Another follow up question may be the difference observed between the General Stress Report and Equiv2 stress results (different for the user model). These can be matched by setting the Result Model Option "Total stress (OCT/Max)" to M, which represents Max Shear Stress. AutoPIPE calculates Equiv2 stresses using Tresca stresses, and for General Stress Report the value displayed is Max Shear Stress = Tresca Stress / 2.0. Note, For Equiv2 load combination, the axial force from other load cases is always included and is independent of the Result Model Option "Include axial force". See Also Bentley AutoPIPE
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Wiki Page: - General FAQ's about Piping Code Calculations
Comments, Questions, and Answers about General piping code calculations in AutoPIPE Item #1: Ignore axial force Item #2: Which offshore design should be used? Item #3: Accuracy rating for results Item #4: Russian Codes (and ASME equivalents) Item #5: Project documentation requires specific Piping Code and material library code year See Also Piping Code Calculations - AutoPIPE Bentley AutoPIPE
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Forum Post: RE: Autopipe Guide Supports After Initial Displacement
Hello Daniel, My guess without looking at the models would be based on exact stiffness used in both modeling approach is not exactly the same. You would need to provide more details about the modeling used on both segments. What is the exact difference between the 2 segments? Paste example model and screen shots as needed to convey different modeling approach. Regards, Mike Dattilio Bentley Systems Design Analyst Design Engineering Analysis group ===================================================
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Forum Post: RE: Does autopipe include the nonlinearities due to large geometry change? The equivalent of nlgeom=YES in ABAQUS?
Hello Pedro, AutoPIPE is a first order linear program and unfortunately does not have the capability at this time to handle nonlinearities due to LARGE geometry changes. Regards, Mike Dattilio Bentley Systems Design Analyst Design Engineering Analysis group ===================================================
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Wiki Page: 05. What to do when Project documentation calls for specific Piping Code year and material library code year, but nothing matches exactly in AutoPIPE?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Report Date Logged & Current Version Aug 2014 09.06.00.19 Problem: Our Project Design Specification calls for ASME II 2010 for Material and ASME III 2007 with 2008 addenda for Rules for construction of nuclear facility components. However, there is no exact selection of ASME III Code year within AutoPIPE. Please advise the appropriated setup for ASME III Nx Stress analyses with above described Code year. Solution: AutoPIPE V8i 09.06.00.xx and lower has the following nuclear codes for selection: Update April 2019, AutoPIPE 12.00.00.19 ASME BPV-III-1-NB (1972 - 2007) Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection NB, Class 1 Components (1972 + 1972 W addenda, 1974 + 1975 W addenda, 1977, 1980 + 1982 W addenda, 1983 + 1983 W addenda, 1986 + 1988 addenda, 1989, 1989 + 1989 addenda, 1992 + 1994 addenda, 1995 + 1997 addenda, 1998, 2001, 2004, and 2007) Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection NB, Class 1 Components (1972 + 1972 W addenda, 1974 + 1975 W addenda, 1977, 1980 + 1982 W addenda, 1983 + 1983 W addenda, 1986 + 1988 addenda, 1989, 1989 + 1989 addenda, 1992 + 1994 addenda, 1995 + 1997 addenda, 1998, 2001, 2004, 2007, 2007 + 2008 addenda, 2010, 2010 + 2011 addenda, 2013, 2015 and 2017) ASME BPV-III-1-NC (1972 - 2007) Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection NC, Class 2 Components (1972 + 1972 W addenda, 1974 + 1975 W addenda, 1977, 1980 + 1980 S addenda, 1983 + 1983 W addenda, 1986 + 1988 addenda, 1989, 1989 + 1989 addenda, 1992 + 1994 addenda, 1995 + 1997 addenda, 1998, 2001, 2001 + 2003 addenda, 2004 and 2007) Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection NC, Class 2 Components (1972 + 1972 W addenda, 1974 + 1975 W addenda, 1977, 1980 + 1980 S addenda, 1983 + 1983 W addenda, 1986 + 1988 addenda, 1989, 1989 + 1989 addenda, 1992 + 1994 addenda, 1995 + 1997 addenda, 1998, 2001, 2001 + 2003 addenda, 2004, 2007, 2007 + 2008 addenda, 2010, 2010 + 2011 addenda, 2013, 2015 and 2017) ASME BPV-III-1-ND (1972 - 2007) Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection ND, Class 3 Components (1972 + 1972 W addenda, 1974 + 1975 W addenda, 1977, 1980 + 1980 S addenda, 1983 + 1983 W addenda, 1986 + 1988 addenda, 1989, 1989 + 1989 addenda, 1992 + 1994 addenda, 1995 + 1997 addenda, 1998, 2001, 2001 + 2003 addenda, 2004 and 2007) Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection ND, Class 3 Components (1972 + 1972 W addenda, 1974 + 1975 W addenda, 1977, 1980 + 1980 S addenda, 1983 + 1983 W addenda, 1986 + 1988 addenda, 1989, 1989 + 1989 addenda, 1992 + 1994 addenda, 1995 + 1997 addenda, 1998, 2001, 2001 + 2003 addenda, 2004, 2007, 2007 + 2008 addenda, 2010, 2010 + 2011 addenda, 2013, 2015 and 2017) As you can see there is currently no 2007 + 2008 addenda edition. This enhancement has already been logged under CAE-CR-6978: "Update ASME NB NC and ND code to 2008 addenda" and will be included in a future build of the application. Please review the code as there is not much difference between 2007 release. With regards to which code to select from the Tools> Model options> General> Piping code> drop down listing, due to liability law suits Bentley TSG is not at liberty to dictate what piping code / year should be used in your model. That is for you to determine. Recommend reviewing the possibility of using ASME NB, NC, or ND piping code. Most of the material data in the libraries associated with the Nuclear Piping codes has come from ASME BPV-III. Please see the online help for details of what code year. Help > Contents> Search Tab> enter "BPV-III" (include the quotes), press List Topics button, double click on the selected topic from the list provided to see more information. See Also "General" Piping Code Calculation Bentley AutoPIPE
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Wiki Page: 03. What is the accuracy rating for results in AutoPIPE compared to hand calculated values?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Report Date Logged & Current Version April 2019 12.00.00.14 Problem: What is the accuracy rating for results in AutoPIPE compared to hand calculated values? Solution: Bentley AutoPIPE's accuracy has always been and will continue to be no more than 2% error. As mentioned in our ATS documentation: "The numerical results of the AutoPIPE Acceptance Test Set shall be within the acceptance criteria of nominally 2%, unless otherwise noted. Numerical results generated by other editions, or run under differing operating environments, are also expected to be within the same acceptance criteria (nominally 2%, unless otherwise noted). Therefore, edition specific output comparison files will not be provided." See Also "General" Piping Code Calculation Bentley AutoPIPE
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Wiki Page: 04. What Russian Codes (and ASME equivalents) can AutoPIPE be used for?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Report Date Logged & Current Version April 2019 12.00.00.14 Problem: What Russian Codes (and ASME equivalents) can AutoPIPE be used for? Solution: Bentley AutoPIPE includes the latest Russian SNIP 2.05.06-85 for design of above and underground Oil and Gas pipelines has successfully been certified as meeting the Russian GOST standard. AutoPIPE has also been GOST certified as compliant with the following Russian standards: SNIP 2.05.06-85 - Above ground Oil and Gas Main pipelines SNIP 2.04.12-86 - Steel pipelines of water supply and the water drain SP34-116-97 - Designing, construction and reconstruction oil-and-gas pipelines CA 03-003-07 - Technological pipelines pressure less than 10 MPa PTM 38.001-94 - Pipelines at pressures greater than 10 to 100 MPa CH 550-82 - technological pipelines from plastic BH 39-1.9-005-98 - Sea, coastal pipelines RD 10-249-98 - pipelines of steam and hot water (ASME B31.1 equivalent) RD 10-400-01 - pipelines of thermal networks RD PTM26-01-44-78 - Technological pipelines pressure more than 10 Mpa 32388-2013 - Process Pipes (ASME B31.3 equivalent) For this certification the user can use the appropriate ASME code See Also "General" Piping Code Calculation Bentley AutoPIPE
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Forum Post: RE: Components' dimension and vibration analysis
Hello AKO, See WIKI here about General information. Bentley AutoPIPE like all other stress programs uses 1-D finite elements which use simple Beam element center-line based theory, also known as the stiffness or displacement method, to mathematically model the piping system in three dimensional space. The system is formulated into a set of linear equations, describing the system characteristics at each degree of freedom (DOF). However, AutoPIPE differs from other applications because each point (e.g., piping, soil, beam, etc.) in an AutoPIPE modeled system has six (6) degrees of freedom. The exact formulation of these equations and their solution depends on the type of loading being investigated. Therefore, yes all characteristics & external loading on each component are considered in both Static and Dynamic analysis. Regards, Mike Dattilio Bentley Systems Design Analyst Design Engineering Analysis group ===================================================
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Forum Post: RE: 2/3 SEISMIC MOMENTS PER CANADIAN CSA 289.3
Hello Rayzins03 , Correct, the factor is added to the default combinations only If you create any new user combination you will need to manually update the Factor accordingly. Regards, Mike Dattilio Bentley Systems Design Analyst Design Engineering Analysis group ===================================================
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Forum Post: RE: Components' dimension and vibration analysis
Hi Mike This is the one in which the center line of support and pipe coincides with a few mm offset: However here, here the the center line of I-beam and pipe are apart by Pipe's radius+h/2 of the I-beam.: Based on your comment, I assume the second model is closer to real case. Am I right? Thank you, Ako
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Wiki Page: 05. Piping Code Calculations - AutoPIPE
Be sure to review the following AutoPIPE online help information: Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> This area describes variables, equations, and methodology used by AutoPIPE to produce output reports per the code associated with the piping system database. AutoPIPE is capable of generating actual and allowable stresses for each of the applicable stress categories (depending on the current, analyzed load cases) for all codes listed below. Please Note: The Standard edition only has access to 4 ASME codes and European code EN13480 as shown in the Getting Started topic "AutoPIPE Standard vs Advanced vs Nuclear". Select the Piping code hyperlink below for general questions about the code's calculations. Note: 1. additional hyper links are added as new information is presented. 2. Allowable values are calculated based on code requirements. See the online help location mentioned above for details. Example: Allowable calculation for ASME B31.1 (2012), "Stresses Due to Sustained Loads" category. Please see the following AutoPIPE help section: Help > Contents> Contents Tab> Reference Information> Code Compliance Calculations> ASME B31.1 (2012)> Stresses Due to Sustained Loads> Read the information, the allowable calculation is mentioned in the write-up. "AutoPIPE reports sL, and the allowable stress (SH) ." The allowable calculation for this category is ( SH ). In addition, other settings under Tools> Model Options> Results may affect the allowable calculations (i.e. Sustain Margin (Y/N/E), etc..) Code Name Description ASME B31.1 Power Piping ASME B31.3 Process Piping ASME B31.4 Liquid Transportation Systems for Hydro-carbons, Liquid Petroleum Gas, Anhydrous Ammonia, & Alcohols ASME B31.8 Gas Transmission & Distribution Piping Systems ASME B31.4 Chapter IX Offshore Liquid Piping Systems ASME B31.8 Chapter VIII Offshore Gas Transmission ASME BPV-III-1-NB Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection NB, Class 1 Components ASME BPV-III-1-NC Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection NC, Class 2 Components ASME BPV-III-1-ND Boiler & Pressure Vessel Code, Rules for Construction of Nuclear Power Plant Components Division 1, Subsection ND, Class 3 Components HDPE - CC N-755-1 High-Density Polyethylene JSME S NC1-PPC Rules on Design and Construction for Nuclear Power Plants, Class 2 Piping BS806 Design and Construction of Ferrous Piping Installations For and In Connection with Land Boilers SPC Swedish Piping Code, Code for Piping in Stationary Plants (Stress Analysis - Method 2) TBK5-6 Norwegian Pressure Vessel Committee, General Rules for Piping Systems STOOMWEZEN (D1101) Dutch Piping Rule D1101 of the Rules for Pressure Vessels CAN/CSA-Z662 Canadian Standards Association, Oil and Gas Pipeline Systems DNV Norwegian Piping Code, Rules for Submarine Pipeline Systems MITI501 Technical Standards for Construction of Nuclear Power Plant Components - MITI Notification No. 501 KHK Level 1 KHK E 012 Japanese Piping Code for Seismic Loads, Level 1 KHKLevel 2 KHK E 012 Japanese Piping Code for Seismic Loads, Level 2 EN13480 EN 13480 European Standard for Metallic Industrial Piping RCC-M French Piping Code SNCT French Piping Code SNiP Russian Trunk Pipelines Code BS7159 Design and Construction of Glass Reinforced Plastics (GRP) Piping Systems for Individual Plants or Sites ISO 14692 Petroleum and Natural Gas Industries, Glass-Reinforced Plastics (GRP) Piping General General Piping Code See Also - General FAQ's about Piping Code Calculations Piping codes - AutoPIPE Bentley AutoPIPE
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Wiki Page: 06. Does AutoPIPE calculate the required pipe wall thickness?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Calculation Date Logged & Current Version April 2019 12.00.00.14 Problem: Does AutoPIPE calculate the required pipe wall thickness? Solution: At this time, April 2019, AutoPIPE does not calculate the required pipe wall thickness. The user must enter the pipe properties on the dialog. The program then uses these values in calculating the stresses and loads in the modeled piping system given the pipe arrangement, support system, and various loads entered. After reviewing the results grids and / or output reported values, the user can determine if additional changes are needed. No changes to the model are automatically done. The user must make changes to the model manually. See Also General FAQ about Piping Code Bentley AutoPIPE
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Wiki Page: 01. Why does AutoPIPE ignore axial force in most of the code equations?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: Date Logged & Current Version April 2019 12.00.00.14 Problem: Why does AutoPIPE ignore axial force in most of the code equations? Solution: Confirm the model is considering axial force, as this option by default is turned OFF. See Tool> Model Options> Results> "Include axial force" option Excerpt from online help: The piping codes ignore the effect of axial force for calculating stresses in the sustained and occasional categories (only bending moments are considered, see Code Compliance Calculations). This option has been provided to allow the inclusion of axial force effects. By default this option is unchecked.... See online help for more information on this option. See Also General FAQ about Piping Code Bentley AutoPIPE
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Wiki Page: 02. What piping codes should be used for offshore design in AutoPIPE?
Applies To Product(s): AutoPIPE Version(s): ALL; Area: General Date Logged & Current Version April 2019 12.00.00.14 Problem: What piping codes should be used for offshore design? Solution: Consider using one of the following piping codes: - ASME B31.4 - Chapter IX, Offshore Liquid Pipeline Systems - ASME B31.8 - Chapter VIII, Offshore Gas Transmission - Z662-07 - Oil and Gas Pipeline Systems - DNV-OS-F101 - Submarine Pipeline Systems See Also General FAQ about Piping Code Bentley AutoPIPE
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