PIPELINE STRESS ANALYSIS WITH CAESAR II by Andrey Puruhita PIPELINE STRESS ANALYSIS WITH CAESAR II пЃ¶ What the different with piping stress ? пЃ¶ Pipeline burried modeling пЃ¶ Anchor block restrain пЃ¶ Load case combination & result The difference of piping & pipeline stress analysis Piping modeling вЂў Code requirement shall use ASME B31.3 вЂў Aboveground вЂў Many support or restrain needed Pipeline modeling вЂў Code requirement use ASME B31.4 for liquid & B31.8 for gas transmission вЂў Usually Underground вЂў Shall use anchor block as a restrain from abovegroundunderground conversely Burried Pipe вЂў Buried pipe deforms laterally in areas immediately adjacent to changes in directions вЂў In areas far removed from bends and tees the deformation is primarily axial PIPELINE BURRIED MODELING вЂў The Buried Pipe Modeler is started by selecting an existing job, and then choosing menu option Input-Underground from the CAESAR II Main Menu вЂў Enter the soil data using Buried Pipe - Soil Models вЂў Describe the sections of the piping system that are buried, and define any required fine mesh areas using the buried element data spreadsheet вЂў Convert the original model into the buried model by the activation of option Buried Pipe - Convert Input Input soil models The buried element description spreadsheet serves several functions вЂў It allows the user to define which part of the piping system is buried. вЂў It allows the user to define mesh spacing at specific element ends. вЂў It allows the input of user defined soil stiffnesses Burried pipe example Anchor Block Restrain вЂў Pipeline with a long distance needs block valve, there were a change direction from underground to aboveground вЂў In this situation pipeline must be installed with anchor block before and after aboveground pipe Why we need anchor block ? вЂў To prevent stress failed on block valve due to axial deformation of a long pipeline Example of block valve modeling Anchor block Anchor block Load Case Combination вЂў To check stress analysis on pipeline shall use several load case combination as folow : вЂў Sustain Load ( W + P) вЂў Thermal Load (T) вЂў Combination Load ( W + T + P) Caesar Stress Result вЂў вЂў вЂў вЂў вЂў 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 % вЂў вЂў вЂў вЂў вЂў вЂў вЂў 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 вЂў вЂў 60 70 1357. 919. 0. 1.000 / 1.000 10739. 60000. 18. 0. 1.000 / 1.000 10300. 60000. 17. вЂў вЂў 80 90 1461. 3255. 0. 1.000 / 1.000 10842. 0. 1.000 / 1.000 12636. 60000. 18. 60000. 21. вЂў вЂў 90 95 3255. 2703. 0. 1.000 / 1.000 12636. 0. 1.000 / 1.000 12085. 60000. 21. 60000. 20. THANK YOU