Page 23 - Pipelines and Risers

xx Contents

22.2.1 1* Order Wave Loading and Floater Motion Induced Fatigue ..................................................... 413
22.2.2 znd Order Floater Motion Induced Fatigue ................................................................................... 415
22.2.3 VIV Induced Fatigue .................................................................................................................... 416
22.2.4 Other Fatigue Causes ................................................................................................................... 417
22.3 Riser VIV Analysis Program ............................................................................................................... 418
22.4 Flexible Riser Analysis Program .......................................................................................................... 419
22.5 Vortex-induced Vibration Prediction ................................................................................................... 421
22.6 Fatigue Life .......................................................................................................................................... 422
22.6.1 Estimate Of Fatigue Life ............................................................................................................... 422
22.6.2 Effect of Inspection on Fatigue Analysis ..................................................................................... 422
22.7 Vortex-Induced Vibration Suppression Devices .................................................................................. 423
22.8 Fatigue of Deepwater Metallic Risers .................................................................................................. 423
22.8.1 General ......................................................................................................................................... 423
22.8.2 Riser Fatigue ................................................................................................................................ 424
22.8.3 Conclusions .................................................................................................................................. 430
22.9 References ................................................... ................................................................................. 430
Chapter 23 Piping Systems 433
23.1 Introduction .......................................................................................................................................... 433
23.2 Design Criteria ..................................................................................................................................... 433
23.2.1 General ......................................................................................................................................... 433
23.2.2 Allowable Stress/Strain Levels .................................................................................................... 435
23.3 Load Cases ........................................................................................................................................... 436
23.4 Finite Element Models ......................................................................................................................... 437
23.5 References ........................ .............................................................................................................. 439
Chapter 24 Pipe-in-Pipe and Bundle Systems 441

24.1 General ................................................................................................................................................. 441
24.2 Pipe-in-Pipe System ............................................................................................................................. 441
24.2.1 Introduction ................................. ............................................................................................ 441
24.2.2 Why Pipe-in-Pipe Systems .......... ............................................................................................ 442
24.2.3 Configuration ............................................................................................................................... 443
24.2.4 Structural Design and Analysis .................................................................................................... 444
24.2.5 Wall-thickness Design and Material Selection ............................................................................ 446
24.2.6 Failure Modes .............................................................................................................................. 447
24.2.7 Design Criteria ............................................................................................................................. 447
24.2.8 Insulation Considerations ............................................................................................................. 449
24.2.9 Fabrication and Field Joints ......................................................................................................... 449
24.2.10 Installation ................................................................................................................................ 450
24.3 Bundle System ..................................................................................................................................... 451
24.3.1 General ......................................................................................................................................... 451
24.3.2 Bundle Configurations ................................................................................................................. 452
24.3.3 Design Requirements for Bundle System ....................................... ........................................ 453
24.3.4 Bundle Safety Class Definition ....................................................... ........................................ 453
24.3.5 Functional Requirement ............................................................................................................... 454
24.3.6 Insulation and Heat-Up System .................................................................................................... 454
24.3.7 Umbilicals in Bundle ................................................................................................................... 455
24.3.8 Design Loads ............................. ............................................................................................. 456
24.3.9 Installation by CDTM .... ............................................................................................. 463
24.4 References ............................................................................................................................................ 465

Chapter 25 LCC Modeling as a Decision Making Tool in Pipeline Design 467
25.1 Introduction .......................................................................................................................................... 467
25.1 . 1 General ......................................................................................................................................... 467