PE Pipe Technical Catalogue (PDF) - Pipelife Norge AS

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Pipelife Norge ASPE CATALOGUE-SUBMARINE APPLICATIONS, PIPELIFE NORGE AS, December 2002.Table of content :0.0 INTRODUCTION.......................................................................................................... 40.1 DIFFERENT TYPES OF SUBMARINE PIPELINES ............................................................... 40.1.1 Intake pipeline......................................................................................................... 40.1.2 Transit pipeline........................................................................................................ 50.1.3 Outfall pipeline ........................................................................................................ 60.2 SINKING OF SUBMARINE PE-PIPE, EXAMPLE FROM A REAL PROJECT. (SEE ALSOSECTION A.5) ........................................................................................................................ 80.2.1 Introduction ............................................................................................................. 80.2.2 Sinking of the pipeline............................................................................................. 80.2.3 Installation of diffuser ............................................................................................ 120.2.4 Weather conditions ............................................................................................... 130.2.5 Summary .............................................................................................................. 13A. HYDRAULIC AND TECHNICAL DESIGN......................................................................... 15A.1 TECHNICAL DATA FOR DESIGN OF PE-PIPELINES........................................................ 15A.2 HYDRAULIC DESIGN ................................................................................................. 18A.2.1 Coefficient of friction ............................................................................................. 18A.2.2 Coefficient for singular head losses ...................................................................... 20A.2.3 Density head loss.................................................................................................. 22A.2.4 Hydraulic capacity................................................................................................. 22A.2.5 Self cleaning velocity ............................................................................................ 25A.2.6 Air transport .......................................................................................................... 25A.3 STATIC DESIGN ....................................................................................................... 28A.3.1 Internal pressure................................................................................................... 28A.3.1.1HOOP DIRECTION................................................................................................................................28A.3.1.2 LONGITUDINAL DIRECTION ...................................................................................................................29A.3.2 External loads / buckling ....................................................................................... 31A.3.2.1BUCKLING OF UNSUPPORTED PIPE........................................................................................................32A.3.2.2 BUCKLING OF PIPE IN TRENCH / SOIL PRESSURE ....................................................................................35A.3.3 Water hammer ...................................................................................................... 36A.3.4 Temperature stresses ........................................................................................... 38A.3.5 Bending stresses .................................................................................................. 40A.3.5.1BUCKLING OF PE PIPE DURING BENDING...............................................................................................41A.3.6 Other stresses....................................................................................................... 43A.3.6.1 CURRENT AND WAVE FORCES ..............................................................................................................44A.3.6.2 HOVERING PIPELINE............................................................................................................................45A.3.6.3 CONCENTRATED LOADS ......................................................................................................................45Side 2 av 84
Pipelife Norge ASPE CATALOGUE-SUBMARINE APPLICATIONS, PIPELIFE NORGE AS, December 2002.A.3.7 Combined loads.................................................................................................... 46A.4 DESIGN OF LOADING BY CONCRETE WEIGHTS ............................................................ 48A.4.1 Degree of loading.................................................................................................. 48A.4.2 Types of concrete weights .................................................................................... 50A.4.3 Stability of PE-pipeline on the seabed .................................................................. 51A.4.4 Recommended “air filling rate” for subwater pipelines .......................................... 54A.4.5 Current forces ....................................................................................................... 55A.4.6 Wave forces.......................................................................................................... 58A.5 DESIGN OF PARAMETERS FOR THE SINKING PROCESS................................................. 66A.5.1 Internal air pressure .............................................................................................. 67A.5.2 Pulling force .......................................................................................................... 67A.5.3 Sinking velocity ..................................................................................................... 71B. INSTALLATION......................................................................................................... 76B.1 JOINTING OF PE PIPES ............................................................................................ 76B.2 BUTT FUSION OF PE PIPES....................................................................................... 77B.2.1 Welding parameters.............................................................................................. 77B.2.2 Welding capacity................................................................................................... 78B.3 INSTALLATION......................................................................................................... 79B.3.1 Buried PE pipes .................................................................................................... 79B.3.2 Pipe laying on seabed........................................................................................... 81AUTHOR : TOM A. KARLSEN, INTERCONSULT ASA............................................................... 84LIST OF REFERENCES : ......................................................................................................... 84REFERENCE PROJECTS…..………………………………………………..………………...85Side 3 av 84
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