Deepwater pipelay has in a few years’time become safe and economical. Although the various installation methods have proven their suitability and each have their specific advantages, selection of pipelay method is dependent on key parameters like pipe type, size and material, barge category, installation equipment water depth and wave & current loading conditions. Between S-Lay and J-Lay, there are significant differences mainly in the system to control the horizontal tension to limit sagben... 

【文章來源】：哈爾濱工程大學(xué)黑龍江省 211工程院校

【文章頁數(shù)】：67 頁

【學(xué)位級別】：碩士

【文章目錄】：
ABSTRACT
1 CHAPTER1 INTRODUCTION
    1.1 Purpose and Significance of Research Work
        1.1.1 Pipeline System
        1.1.2 Pipeline Installation
        1.1.3 Phases of pipeline project
    1.2 Objectives and Scope of Work
    1.3 Arrangement of Thesis Report
2 CHAPTER 2 OFFSHORE PIPELAYING-OVERVIEW
    2.1 Introduction
    2.2 The History
        2.2.1 Operation Pluto
        2.2.2 The 1950s and 1960s
        2.2.3 The 1970s and 1980s
        2.2.4 The 1990s and the Present
    2.3 Installation Methods
        2.3.1 Lay Methods
        2.3.2 Tow Methods
    2.4 Standards
    2.5 Measurements
        2.5.1 Vessel position and velocity
        2.5.2 Touchdown position
        2.5.3 Axial tension
        2.5.4 Departure angle
        2.5.5 Roller pressure
        2.5.6 Distance to last roller
        2.5.7 Free—span pipe length
        2.5.8 Touchdown distance
        2.5.9 Water depth
        2.5.10 Environmental loads
3 CHAPTER 3 PIPELAYING MECHANICS
    3.1 Introduction
    3.2 Pipeline Configuration
    3.3 Installation Stresses
        3.3.1 Overbend Region
        3.3.2 Sagbend Region
        3.3.3 Intermediate Region
    3.4 Methods Developed To Analyze Bend Stresses
        3.4.1 Small Deflection Method
        3.4.2 Nonlinear Beam Method
        3.4.3 Natural Catenary Method
        3.4.4 Stiffened Catenary Method
        3.4.5 Finite Element Method
    3.5 Pipelay Tension
        3.5.1 Comparing S-lay and J-lay
        3.5.2 The Optimal Pipelay Tension
    3.6 Pipeline Installation Loads
    3.7 Methodology
    3.8 Normal Lay Analysis
        3.8.1 Static Configuration Analysis
        3.8.2 Strain Check
        3.8.3 Route Radius Check
    3.9 FE Computer Programs for Pipe Laying Analysis
        3.9.1 ORCAFLEX
4 CHAPTER 4 INSTALLATION ANALYSIS & RESULTS
    4.1 Introduction
    4.2 Basic Methodology
    4.3 Modelling
    4.4 Static Analysis
    4.5 Dynamic Analysis
    4.6 Common Data and Terminology
        4.6.1 Environmental Data
        4.6.2 Pipelay Equipment Data
    4.7 Analysis Assumptions
    4.8 Installation Analysis Results
        4.8.1 Input Data
        4.8.2 Results Output
        4.8.3 Static Results Graphs
        4.8.4 Dynamic Results Graphs
    4.9 Installation Analysis for Different Pipe Sizes
        4.9.1 Static Results for 16 in. Pipe,1000m Water Depth
        4.9.2 Dynamic Results for 16 in. Pipe,1000m Water Depth
        4.9.3 Static Analysis Results for 10 in. Pipe,1000m Water Depth
        4.9.4 Dynamic Analysis Results for 10 in. Pipe,1000m Water Depth
        4.9.5 Comparison of Results
    4.10 Installation Analysis at Different Water Depths
        4.10.1 Static Results for 20 in. Pipe,1500m Water Depth
        4.10.2 Dynamic Results for 20 in. Pipe,1500m Water Depth
        4.10.3 Static Results for 20 in. Pipe,2000m Water Depth
        4.10.4 Dynamic Results for 20 in. Pipe,2000 m Water Depth
        4.10.5 Comparison of Results
    4.11 Installation Analysis for Different Current and Wave Direction
        4.11.1 Dynamic Analysis Results-90°Direction of Wave and Current
        4.11.2 Dynamic Analysis Results-180°Direction of Wave and Current
        4.11.3 Comparison of Results
    4.12 Installation Analysis for Different Stinger Angles
        4.12.1 Static Results for 10 in. Pipe with 15°Stinger Angle
        4.12.2 Dynamic Results for 10 in. Pipe with 15°Stinger Angle
        4.12.3 Static Results for 10 in. Pipe with 20°Stinger Angle
        4.12.4 Dynamic Results for 10 in. Pipe with 20°Stinger Angle
        4.12.5 Static Results for 10 in. Pipe with 25°Stinger Angle
        4.12.6 Dynamic Results for 10 in. Pipe with 25°Stinger Angle
        4.12.7 Comparison of Results
CONCLUDING REMARKS AND FUTURE RECOMMENDATIONS
REFERENCES
ACKNOWLEDGEMENTS



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