CAESAR+II_Quick_Start

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MIT Department of Piping Design & Engineering Training Centre, Pune

www.mitpiping.com

Starting CAESAR II

Launch CAESAR II by double-clicking the CAESAR II icon, which should point to theprogram C2.EXE in the CAESAR II installation directory. Note that launching any of theother executable programs in the CAESAR II installation directory can result inunpredictable behavior, at this point the Main Menu displays. It is from the Main Menu

that users select jobs, analysis types, invoke executions, and initiate output reviews.Main Menu options are described in detail in Chapter 4 of this documentfor thepurposes of this Quick Start chapter, only the File , Input , Analysis , and Outputmenus are used.

Main Menu

All CAESAR II analyses require a job name for identification purposessubsequentinput, analysis, or output review references the job name specified. The job name isselected using the File menu, using one of three methods.

Whenever users wish to begin a new job,selecting File-New (or clicking the New iconfrom the toolbar) requires the user to enter a

job name and data directory. For the purposesof this example, users should enter a name,select Piping Input , and select an alternatedirectory for the file, if desired.


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Selecting a job name does not open the file; as noted, it indicates the job on which inputmodeling, analysis, output review, or other operations will be done. Users must stillselect one of these operations from the menu.

Open Dialog

Basic Operation

Once you have started the program and opened the file, you will choose the requiredoperation.

Piping Input Generation

Once the desired job name has been specified, users can launch the interactive modelbuilder by selecting the Input-Piping entry of the Main Menu .The input generation of the model consists of describing the piping elements, as well asany external influences (boundary conditions or loads) acting on those elements. Each


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3. Enter S (standard schedule pipe wall) in the Wt/Sch field. This is automaticallyconverted to wall thickness.

4. Enter 600 (degrees Fahrenheit) in the Temp 1 field.5. Enter 150 (psig) in the Pressure 1 field.6. Double-click the Bend checkbox. The Bends tab displays. This adds a long radius

bend at the end of the element, and adds intermediate nodes 18 and 19 at the nearweld and mid points of the bend respectively (node 20 physically represents the farweld point of the bend).

7. Double-click the Restraint checkbox. The Restraint tab displays. In the first Nodefield enter 10; then select ANC from the firstType drop list.

8. Select A106 B from the Material drop list.This selection fills in the material parameterssuch as density and modulus elasticity.

9. Double-click the Allowable Stresscheckbox and select the B31.3 code from theCode drop list.

Note Allowable stresses for the given material,temperature, and code display automatically.

10. Enter 0.85SG (0.85 specific gravity) in theFluid Density field. The program automaticallyconverts this value to density.

11. To enter the second element of the model,

pressAlt-C,

or click the Skip to Next Elementicon, or use the Edit-Continue to moveto the spreadsheet for a new element,element 20-30.

Note Node numbers are automaticallygenerated, distributed and data iscarried forward from previous

spreadsheets.12. Enter the value 10-0 (10 feet) in the

DY field.13. Double-click the Restraint

checkbox. In the first Node field,enter 30; then selectANC from the first Type droplist.The two-element model (an ell-


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configuration anchored at each end) is now complete.

The piping preprocessor also provides interactive graphics and listing functions tofacilitate model editing and verification. The CAESAR II piping preprocessor is designedto make these tasks intuitive and efficient. Model verification can be performed usingeither the Graphics or List utilities, although a combination of both modes isrecommended. The Graphics and List utilities are discussed in Chapter 5 of thismanual. The CAESAR II graphics screen, displays by default, next to the inputspreadsheet. However, the spreadsheet can be collapsed to provide maximum graphicspace as shown below.

Once the model is completed, it must be checked for errors before analysis is permitted.This can be done using the File -Error Check menu option, or the Error Check icon onthe toolbar.


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Building the Load Cases

A static analysis can be started from the Main Menu, or the piping input, once theanalysis data files have been generated by the error checker. The first stage of a staticanalysis is to set up the load cases. For new jobs (no previous solution files available),the static analysis module recommends load cases to the user based on the load types

encountered in the input file. These recommended load cases are usually sufficient tosatisfy the piping code requirements for the Sustained and Expansion load cases. Ifthe recommended load cases are not satisfactory, the user has the option of directlymodifying them.Selecting the Analysis-Statics option from the Main Menu, or selecting the Edit-EditStatic Load Cases from the piping preprocessor, launches the Load Case Builder .

Loads can bebuilt two waysby 1) combiningthe load

componentsdefined in theinput (weight,

displacements,thermal cases,etc.) into loadcases (basiccases), and 2)combining pre-existing loadcases into newload cases

(combinationcases).Users can buildthe basic casesby selecting(one or more

load components),dragging, anddropping loadcomponents fromthe Loads Definedin Input list (in theleft hand column) tothe Load Cases liston the right. Stresstypes (indicatingwhich codeequations should beused to calculateand check thestresses) can be


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selected from the Stress Type list on each line.

Combination cases, if present, must always follow the basic cases. Users can buildcombination cases by selecting (one or more load components), dragging, and droppingbasic load cases from earlier in the load case list to combine cases (or blank load cases)later in the Load Cases list.

Note Load cases may also be built by typing on any of the individual lines.

Executing Static Analysis

Once the load cases have been defined, the user begins the actual finite elementsolution through the use of the File-Analyze command on the toolbar, or by clicking theStart Run icon on the toolbar located in the Static Load Case builder. The solutionphase commences with the generation of the element stiffness matrices and loadvectors, and solves for displacements, forces and moments, reactions, and stresses.This solution phase also performs the design and selection of spring hangers, anditerative stiffness matrix modifications for nonlinear restraints. The user is kept apprised

of the solution status throughout the calculation.

Static Output Review

A review of the static analysis results is possible immediately after a static solution, or ata later time by selecting the Output-Static option of the CAESAR II Main Menu. Thestatic output processor presents the user with an interactive selection menu from whichload cases and report options can be selected.

Results can bereviewed byselecting one ormore load casesalong with oneor more reports(selection isdone byclicking, Ctrl-clicking, andShift-clicking themouse). The

results can bereviewed on theterminal,

printed, or sentto a file, byusing the ViewReports , MSWord , File-

Save/SaveAs ,


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or File-Print menu commands and/or toolbars. The user can also use the View-Plotmenu command or the Plot toolbar to review the analytic results in graphics mode,which can produce displaced shapes, stress distributions, and restraint actions.

The actual study ofthe results depends onthe purpose of eachload case, and thereason for theanalysis. Usually thereview checks that thesystem stresses arebelow theirallowables, restraintloads are acceptable,and displacements arenot excessive.Additional postprocessing (such asequipment, nozzle,and structural steelchecks) may berequired depending onthe model and type ofanalysis.

Once the review of the output is finished, the user can return to the main CAESAR II menu byexiting the output review module.

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CAESAR+II_Quick_Start