Pipeline stress analysis with ceaser ii
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Pipeline stress analysis with ceaser ii
- 1. PIPELINE STRESS ANALYSIS WITHPIPELINE STRESS ANALYSIS WITH CAESAR IICAESAR II by Andrey Puruhita
- 2. PIPELINE STRESS ANALYSISPIPELINE STRESS ANALYSIS WITH CAESAR IIWITH CAESAR II What the different with piping stress ?What the different with piping stress ? Pipeline burried modelingPipeline burried modeling Anchor block restrainAnchor block restrain Load case combination & resultLoad case combination & result
- 3. The difference of piping & pipeline stress analysis Piping modeling • Code requirement shall use ASME B31.3 • Aboveground • Many support or restrain needed Pipeline modeling • Code requirement use ASME B31.4 for liquid & B31.8 for gas transmission • Usually Underground • Shall use anchor block as a restrain from aboveground- underground conversely
- 4. Burried Pipe • Buried pipe deforms laterally in areas immediately adjacent to changes in directions • In areas far removed from bends and tees the deformation is primarily axial
- 5. PIPELINE BURRIED MODELING • The Buried Pipe Modeler is started by selecting an existing job, and then choosing menu option Input-Underground from the CAESAR II Main Menu • Enter the soil data using Buried Pipe - Soil Models • Describe the sections of the piping system that are buried, and define any required fine mesh areas using the buried element data spreadsheet • Convert the original model into the buried model by the activation of option Buried Pipe - Convert Input
- 8. The buried element description spreadsheet serves several functions • It allows the user to define which part of the piping system is buried. • It allows the user to define mesh spacing at specific element ends. • It allows the input of user defined soil stiffnesses
- 10. Anchor Block Restrain • Pipeline with a long distance needs block valve, there were a change direction from underground to aboveground • In this situation pipeline must be installed with anchor block before and after aboveground pipe
- 11. Why we need anchor block ? • To prevent stress failed on block valve due to axial deformation of a long pipeline
- 12. Example of block valve modeling Anchor block Anchor block
- 13. Load Case Combination • To check stress analysis on pipeline shall use several load case combination as folow :
- 14. • Sustain Load ( W + P) • Thermal Load (T) • Combination Load ( W + T + P)
- 15. Caesar Stress Result • CAESAR II STRESS REPORT FILE:FOR TUTORIAL • CASE 3 (OPE) W+T2+P1 DATE:OCT 1,2009 • --Stress(lb./sq.in.)--- --(lb./sq.in.)-- • ELEMENT BENDING TORSION SIF'S ALLOWABLE • NODES STRESS STRESS IN/OUT PLANE STRESS STRESS % • HIGHEST STRESSES: (lb./sq.in.) • OPE STRESS %: 21.06 @NODE 90 • STRESS: 12636.4 ALLOWABLE: 60000.0 • BENDING STRESS: 3254.8 @NODE 90 • TORSIONAL STRESS: 0.0 @NODE 49 • AXIAL STRESS: 9455.2 @NODE 130 • 3D MAX INTENSITY: 30120.4 @NODE 20 • 60 1357. 0. 1.000 / 1.000 10739. 60000. 18. • 70 919. 0. 1.000 / 1.000 10300. 60000. 17. • 80 1461. 0. 1.000 / 1.000 10842. 60000. 18. • 90 3255. 0. 1.000 / 1.000 12636. 60000. 21. • 90 3255. 0. 1.000 / 1.000 12636. 60000. 21. • 95 2703. 0. 1.000 / 1.000 12085. 60000. 20.
- 16. THANK YOU