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1 Finite Element Analysis in Pipeline Design using Ansys at INTECSEA

2 Agenda: Introduction Lateral Buckling Pipeline Walking Free Span Detailed Analysis On-Shore Installation Analysis Structural Design - 2 -

3 Introduction - 3 -

4 Lateral Buckling Analysis Global buckling is a response to compressive effective axial force and global buckling reduces the axial carrying capacity. Pipelines exposed to potential global buckling are then either those with high effective axial compressive forces, or pipelines with low buckling capacity, typically light pipelines with low lateral pipe-soil resistance. DNV-RP-F

5 Lateral Buckling Analysis ANSYS Routine Package Exposed Pipeline on Even Seabed - DNV-RP-F

6 Lateral Buckling Analysis INPUT: Pipe properties Temperature e Pressure Profile Boundary Conditions Soil Parameters RESULT: Export axial force, internal pressure and bending moment Assess the Load Controlled Condition Check as per DNV-OS-F101 Plastic Strain can also be exported and used in the calculation of Displacement Controlled Condition Check as per DNV- OS-F101 MODEL: PIPE288 element Pipe soil interaction: * Seabed: TARGE170 * Pipe: CONTA

7 Pipeline Walking Pipeline walking can occur for short free-ended pipelines subjected to cyclic loading. Pipeline walking is a phenomena in which start-up / shut-down cycles cause a ratcheting response in the pipeline axial displacement. Over a number of cycles this ratcheting can lead to very large global axial displacement with associated overload of jumper or spool pieces. SAFEBUCK - 7 -

8 Pipeline Walking There are three main mechanisms which drive pipeline walking: Thermal gradients during heat-up Seabed slope Riser tension Temperature (ºC) Seabed Elevation (m) KP (m) 1st Transient 2nd Transient 3rd Transient 4th Transient Full Temperature Water Depth (m) Riser Rig move Riser-Flowline Connection Riser Tension Force KP (m) - 8 -

9 Pipeline Walking 0.05 Relative Axial Displacement (m) st Cooldown 2nd Cooldown 3rd Coo ldown 4th Coo ldown 5th Coo ldown Distance along pipeline (m) - 9 -

10 Free Span Analysis

11 Free Span Analysis In ANSYS, we basically calculate the mode shape and the natural frequency. DNV-RP-F

12 Free Span Analysis The free span analysis may be based on approximate response expressions or a refined FE approach depending on the free span classification and response type, see Sec.6. DNV-RP-F105 Approximate Response Analysis

13 Free Span Analysis m Adjacent Length 300m Adjacent Length Water depth (m) Critical Span KP (m) Seabed Profile Pipeline Profile Mode shape KP (m) Mode Shape Seabed Profile Pipeline Profile Water depth (m)

14 Free Span Analysis m Adjacent Length 300m Adjacent Length Water depth (m) Critical Span KP (m) Seabed Profile Pipeline Profile Mode shape KP (m) Mode Shape Seabed Profile Pipeline Profile Water depth (m)

15 On-Shore Pipeline Installation

16 On-Shore Pipeline Installation Analysis steps: 1. Lay the pipe on the roller 2. Lift the pipe 3. Move the pipe laterally 4. Lower the pipe 5. Lay the pipe on the roller 6. Lift the pipe 7. Move the pipe laterally 8. Lower the pipe

17 On-Shore Pipeline Installation Analysis steps: 1. Lay the pipe on the roller 2. Lift the pipe 3. Move the pipe laterally 4. Lower the pipe 5. Lay the pipe on the roller 6. Lift the pipe 7. Move the pipe laterally 8. Lower the pipe

18 On-Shore Pipeline Installation Client: PETROBRAS Project: Dutos Sergipe

19 Structural Design # Swivel Flange Design for Camorim Field in Sergipe

20 Structural Design Riser Clamp Design for Dourado Field

21 Future Development: Bottom Roughness Analysis - Substitute SAGE as our main Software for this type of analysis On-Bottom Stability Analysis - Assess the anchoring effect of the stable part of the pipeline SAGE Profile 3D

22 The End Thank you All!

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