AutoPIPE and caesar are different applications that perform stress analysis on piping systems. One of the major problems when comparing the results between these applications would be confirming that the models are identically represented. The following aims to help convert a specific caesar model setting into an AutoPIPE model setting.
Note AutoPIPE and caesar are constantly changing. Setting names and location maybe explained by the following but can be modified as new versions are released. Suggest to use AutoPIPE Help search utility with key words to find potential new information and / or locations for settings.
| Special Parameters Dialog |
Print Forces on Rigid and Expansion Joints:
AutoPIPE: No equivalent setting, forces and moments are printed at all node points regardless of rigid settings.
Print Alphas and Pipe Properties
AutoPIPE: On the Input Listing dialog (Home > Reports > Input Listing > Input Listing), enable / disable option to print the Pipe Properties sub-report
Activate Bourdon Effects
AutoPIPE: caesar's setting to:
a. "None" =
b. "Translation only" = would be equivalent to AutoPIPE's Calculate Pressure Extension cases, e.g. P1, P2, etc" enabled for each Analysis set as needed.
c. Translation and Rotation = Same as option for "Translation" and Tools>Model Options>Edit >"Include Bourdon rotational effect" = checked
Branch Error and Coordinate Prompts
Thermal bowing Delta Temperature
AutoPIPE: On the Thermal Bowing dialog (Loads > Thermal > Thermal Bowing), change setting for "Temperature difference (top to bottom of pipe)"
Liberal Stress Allowable
AutoPIPE: "Set Sustain Margin (Y/N/E)" on the Model (Result > Result Options > Model). Liberal = Y, E = Sustained load margin automatically included only if calculated thermal stress SE > SA
Yield Criterion Stress
AutoPIPE: Set "Total stress(Oct/Max)" = M on the Model (Result > Result Options > Model)
Uniform load in G's
AutoPIPE: By default all Static Seismic loads are entered with values in G's units.
Ambient Temperature
AutoPIPE: On the General Model Options dialog (Home > Model Options > General), set value for "Ambient temperature"
FRP Coef of Thermal Expansion
AutoPIPE: All pipe properties are save / retrieved from Material Library based on temperature settings. See library values by using Library dialog (Tools > Tools > Library)
Table type = Material
Action = Scan
FRP Ratio and Shear Modulus Emod Axial
AutoPIPE: Update "Shear Modulus" values on Pipe Properties (Insert or Modify > Properties > Pipe Properties) dialog for the intended PipeID as needed
FRP Laminate Type
AutoPIPE: Update "Laminate Type" value on Pipe Properties (Insert or Modify > Properties > Pipe Properties) dialog for the intended PipeID as needed. See image above
Z-axis vertical
AutoPIPE: On the General Model Options dialog (Home > Model Options > General), set value for "Vertical Axis direction", See image above.
Bandwidth Minimizer Options
Optimizer method
Collins Ordering
Next Node Selection
Degree Determination
Final Ordering
User Control
| Hanger Design Control Data Dialog |
No of Hanger Design Operating load case
AutoPIPE: Open Hanger Selection dialog (Analysis > Analyze > Hanger Selection). The number of "Design operating cases" considered will be always be equal to the "Number of Thermal/Pressure cases" defined on the General Model options dialog imaged above. Example: Number of Thermal/Pressure cases= 1, thus number of Design operating cases would be limited to T1 as indicated below:
Calculating Actual Cold Load
AutoPIPE: The program has 2 techniques for analyzing a spring hanger, Cold load method or Hot load method (refer to AutoPIPE help for details on these settings). Enable / Disable Cold Load design option on indicated Support dialog (Insert or Modify > Supports > Support), imaged below:
Allow Short Range Springs
AutoPIPE: Not available. Spring range allowable movement is a property inherent in the spring hanger tables. If the spring hanger table selected encompasses the range of movement it would be considered during the selection process.
Allowable Load variation
AutoPIPE: there are 2 locations where this can be set:
Individually changed: Open Support dialog (Insert or Modify > Supports > Support), set value for "Load Variation (ratio)", imaged above:
Globally changed: Open Hanger Selection dialog (Analysis > Analyze > Hanger Selection), enable "Specify Load Variation to use for all springs" option and enter value in "Load variation (ratio)", imaged above
Rigid support Displacement Criteria
AutoPIPE: Open Hanger Selection dialog (Analysis > Analyze > Hanger Selection), set value for "Rigid hanger criterion", imaged above.
Maximum Allowed travel limit
AutoPIPE: Not available. Spring range allowable movement is a property inherent in the spring hanger tables. If the spring hanger table selected encompasses the range of movement it would be considered during the selection process.
Hanger table
AutoPIPE: Open Hanger Selection dialog (Analysis > Analyze > Hanger Selection), set "Spring hanger manufacturer " with drop down selection
Extended Range
Cold Load
see "Allowable Load variation" setting above
Hot load Centered
see "Allowable Load variation" setting above
Multiple Load Case Design Options
AutoPIPE: Open Hanger Selection dialog (Analysis > Analyze > Hanger Selection). Select one or more of the defined design operating cases (T1 - T100) to be considered for the hanger design run.
| Caesar II Configuration Editor - Computational Control |
Convergence Tolerance
Note: All of AutoPIPE Convergence tolerances are only available when performing a Non-linear Analysis. Open any analysis set using on the Static Analysis Sets dialog (Analysis > Setup > Static Analysis Sets),
Decomposition Singularity Tolerance
N/A
Friction Angle Variation
AutoPIPE: Analyze >Static, "Use gaps, friction, soil yielding" > Non linear analysis tolerance settings
Friction Normal Force Variation
AutoPIPE: Analyze >Static, "Use gaps, friction, soil yielding" > Non linear analysis tolerance settings
Friction Slide Multiplier
AutoPIPE: Analyze >Static, "Use gaps, friction, soil yielding" > Non linear analysis tolerance settings
Friction Stiffness
AutoPIPE: Analyze >Static, "Use gaps, friction, soil yielding" > Non linear analysis tolerance settings
Red Increment
N/A
Rod Tolerance
N/A
Input Spreadsheet Defaults
Alpha Tolerance
N/A
Coefficient of Friction (Mu)
AutoPIPE: Insert / Modify a Support and enter value for Friction. Once a support has been defined in a current modeling session, subsequent displays of the Support dialog will default to the values most recently defined.
Default Rotational Restraint Stiffness
AutoPIPE: Conform help information for Support and Anchor Rigid stiffness match this setting.
Support Rigid Stiffness - Edit (Home > Model Options > Edit> Rotation)
Anchor Rigid Stiffness - Edit (Home > Model Options > Edit> Rotation )
Otherwise, Rigid rotational stiffnesses 10E12lb x in/rad (cannot be changed)
Default Translational Restraint Stiffness
AutoPIPE: Rigid translational stiffnesses are assigned values of 10E10lb/in (cannot be changed)
Hanger Default Restraint Stiffness
N/A
AutoPIPE: Once a support has been defined in a current modeling session, subsequent displays of the Support dialog will default to the values most recently defined.
Minimum Wall Mill tolerance
AutoPIPE: The default is 12.5% of the pipe thickness.
New Job Ambient Temperature
AutoPIPE: The ambient, or "cold," temperature condition. For English units, the default will be 70°F; for Metric or SI units, it will be 21.1°C; for BS 7159, the default ambient temperature will be 32°F (0°C). For KHK, MITI, and JSME PPC, the default will be 20°C.
New Job Bourdon Pressure
AutoPIPE: In order for the pressure extension analysis cases (P1 to P100) to be included in the sustained code stress calculations, the result option, 'Inc. Axial, Pcase in Sus' must be enabled (checked) in the Result Model Options dialog, otherwise the pressure extension analysis cases (P1 to P100) should be explicitly added to the code stress combination.
Furthermore, Pipe radius for Bourdon calculation (Edit (Home > Model Options > Edit), This value defines whether the mean or inside radius of the pipe cross section is to be used in the calculation of the Bourdon effect. Using the mean radius generally results in larger deformations compared with using the inside radius. The default value is to use the mean radius of the pipe.
Miscellanious
Bend Axial Shape
Ignore Spring Hanger Stiffness
AutoPIPE: Spring undesigned with no hanger analysis
Include Spring Hanger Stiffmess in Hanger OPE Travel Case
AutoPIPE: Spring stiffness automatically included in Static Analysis
Incore Numerical Check
N/A
Outcore Numerical Check
N/A
Missing Mass ZPA
AutoPIPE: ZPA would be a Dynamic analysis setting that can be enabled / disabled on the Dynamic Analysis dialog (Analysis > Setup > Dynamic Analysis> select any tab but Modal to see check box)
User Pressure Stiffening on Bends
AutoPIPE: This setting would be located on the Analysis set dialog and can be changed for each analysis set.
WRC-107 Interpolation Method
AutoPIPE: Export nozzle loads to AutoPIPE Nozzle to be evaluated by WRC 107.
WRC-107 Version
AutoPIPE: Export nozzle loads to AutoPIPE Nozzle to be evaluated by WRC 107.
| Caesar II Configuration Editor - Geometry Directives |
Bends
Bend Length Attachment Percent
AutoPIPE: change "Distance L/D from flange/valve to bend" value on Edit Options dialog (Tools > Model Options > Edit Options).
Maximum Allowable Bend Angle
N/A
AutoPIPE: There would be no restriction on the maximum angle of bend created in AutoPIPE
Minimum Allowable Bend Angle
N/A
AutoPIPE: There would be no restriction on the minimum angle of bend created in AutoPIPE
Minimum Angle to Adjacent Bend Point
N/A
AutoPIPE: There would be no restriction on the angle between bends in AutoPIPE
Input Items
Auto Node number increment
AutoPIPE: On the Edit Options dialog (Tools > Model Options > Edit Options), enter value for "Default point name offset".
Connect Geometry Through Cnodes
N/A
Horizontal Thermal Bowing Tolerance
AutoPIPE: Set value for "Maximum inclination for horizontal pipe |DY|/L" on "Thermal Bowing" (Loads > Thermal > Thermal Bowing) dialog
Loop Closure Tolerance
N/A
AutoPIPE: AutoPIPE does not support connecting a segment back onto itself to make a closed loop. All closed loops must be created by a minimum of 2 segments.
New Job Z-axis Vertical
AutoPIPE: Set "Vertical axis direction" on the General Model Options dialog (Home > Model Options > General), imaged above.
| Caesar II Configuration Editor - SIF and Stresses |
Advance Settings
Class 1 branch flexibility
AutoPIPE: Equivalent to Nozzle > ASME NB method
Use Schneider
N/A
User WRC 329
N/A
AutoPIPE: insert / modify a "Joint Type & User SIF" value (Insert / Modify > Xtra Data > Joint Type and User SIF)
Code-Specific Settings
B31.1 Reduce Z Fix
AutoPIPE: Automatically calculated per design code
B31.1/B31.3 Verified Welding/Contours Tees
AutoPIPE: Insert / Modify Tee dialog, Tee type = welding, Consider crotch radius and thickness = unchecked
En-13480 / CODETI use In-Plane / Out-Plane SIF
AutoPIPE: set "Single SIF at point" = checked on Results Model Options dialog (Home > Model Options > Result)
Ignore B31.1 / B31.3 WC factor
No Rft / Wlt in Reduced Fittings SIF
Occasional Load Factor
AutoPIPE: Default K = 1.33 for B31.3, change Tools> Code combinations > K factor
Pressure Variation in EXP case
Reduced Intersection
AutoPIPE: Automatically calculated per design code
General Settings
Add F/A in Stresses
AutoPIPE: Enable "Include Axial,Pcase in Sustained" check box on Model Options dialog (Result > Result Options > Model). Also look at "Longitudinal Pressure" setting on the same dialog that enables the user to define a criterion for the calculation of longitudinal pressure stresses in the sustained code compliance combination category
Add Torsional in SL Stresses
AutoPIPE: Enable "Include torsion" check box on Model Options dialog (Result > Result Options > Model). (Note: B31.3:2010 includes Torsion as per code case 178)
All Cases Corroded
AutoPIPE: Enable "Use nominal thickness" check box on Model Options dialog (Result > Result Options > Model).
Allow User SIF at bend
AutoPIPE: Does not restrict adding an SIF value to any node point, be it a bend, valve, straight pipe, etc.. Insert / Modify "Joint Type and User SIF" (Insert > Xtra Data > Joint Type and User SIF) as needed.
Base Hoop Stress ON
N/A
AutoPIPE: calculated per code
Default Piping code
AutoPIPE: Does not have default setting for piping code. Change piping code on General Model options dialog as needed.
Note: Suggest that User create an template model that contains all default settings required by a project, place it in a location that the team can access, and user can copy it and use it as a bases to start a new model.
New Job Liberal Expansion Stress Allowable
Use PD/4t
AutoPIPE: On Model Options dialog (Result > Result Options > Model). change setting for "Longitudinal Pressure" that enables the user to define a criterion for the calculation of longitudinal pressure stresses in the sustained code compliance combination category. Basis for longitudinal pressure stress = AxF/Area
Yield Stress Criterion
Legacy Settings
B1.3 Implement Appendix P
AutoPIPE: On the General Model Options dialog (Home > Model Options > General), set value for "Use Appendix P (B31.3)"
B1.3 Sustain Case SIF Factor
AutoPIPE: "Set Sus/Occ = 0.75i" on the Results Model dialog (Result > Result Options > Model)
B31.3 Use SL Formulation Para 320 (2010)
Include Axial Force in Expansion Stress
AutoPIPE: Enable / Disable "Include axial force" on the Result Model options dialog (Home > Model Options > Result)
SIF Multiplier for Sustained Stress Index
BS 7159 Pressure Stiffening
AutoPIPE: Calculated automatically to FRP code e.g. BS7159
EXCLUDE f2 FROM UKOOA BENDING
N/A
BS 7159 Pressure Stiffening
AutoPIPE: On Results Model Options dialog, "Use code case 178" = checked (since 2010 automatically included in main B31.3 code)
User FRP Flex
AutoPIPE: Calculated automatically to FRP code e.g. BS7159
User FRP SIF
AutoPIPE: Calculated automatically to FRP code e.g. BS7159