| Preface |
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xi | |
| Definitions |
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xiii | |
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1 Introduction to Ageing of Structures |
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1 | (22) |
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1.1 Structural Engineering and Ageing Structures |
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1 | (3) |
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1.2 History of Offshore Structures Worldwide |
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4 | (4) |
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1.3 Failure Statistics for Ageing Offshore Structures |
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8 | (7) |
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8 | (1) |
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1.3.2 Failure Statistics of Offshore Structures |
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8 | (1) |
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1.3.3 Experience from Land Based Structures |
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9 | (1) |
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1.3.4 Experience from Offshore Fixed Steel Structures |
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10 | (4) |
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1.3.5 Experience from the Shipping and Mobile Offshore Unit Industries |
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14 | (1) |
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1.4 The Terms `Design Life' and `Life Extension' and the Bathtub Curve |
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15 | (3) |
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1.5 Life Extension Assessment Process |
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18 | (5) |
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20 | (3) |
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2 Historic and Present Principles for Design, Assessment and Maintenance of Offshore Structures |
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23 | (34) |
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2.1 Historic Development of Codes and Recommended Practices |
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23 | (4) |
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2.1.1 US Recommended Practices and Codes |
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23 | (1) |
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2.1.2 UK Department of Energy and HSE Guidance Notes |
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24 | (2) |
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2.1.3 Norwegian Standards |
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26 | (1) |
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27 | (1) |
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2.2 Current Safety Principles Applicable to Structural Integrity |
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28 | (10) |
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28 | (1) |
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2.2.2 Application of Safety Principles to Structures |
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29 | (1) |
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29 | (1) |
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2.2.2.2 Partial Factor and Limit State Design Method |
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30 | (2) |
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32 | (2) |
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2.2.2.4 Design Analysis Methods |
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34 | (1) |
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2.2.2.5 Management of Structures in Operation |
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35 | (1) |
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35 | (3) |
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38 | (1) |
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2.3 Current Regulation and Requirements for Ageing and Life Extension |
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38 | (5) |
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2.3.1 Regulatory Practice in the UK for Ageing and Life Extension |
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38 | (2) |
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2.3.2 Regulatory Practice in Norway Regarding Life Extension |
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40 | (1) |
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2.3.3 Regulatory Practice in the USA |
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41 | (1) |
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2.3.4 Regulatory Practice Elsewhere in the World |
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42 | (1) |
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2.4 Structural Integrity Management |
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43 | (14) |
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43 | (2) |
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2.4.2 The Main Process of Structural Integrity Management |
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45 | (2) |
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2.4.3 Evolution of Structural Integrity Management |
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47 | (1) |
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47 | (1) |
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2.4.3.2 The Introduction of Structural Integrity Management into Standards |
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47 | (1) |
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2.4.4 Current SIM Approach |
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47 | (4) |
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2.4.5 Incident Response and Emergency Preparedness |
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51 | (1) |
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2.4.6 SIM in Life Extension |
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52 | (1) |
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53 | (4) |
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57 | (38) |
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57 | (5) |
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59 | (1) |
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3.1.2 Structural Information Changes |
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59 | (1) |
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3.1.3 Changes to Knowledge and Safety Requirements |
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60 | (1) |
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3.1.4 Technological Changes |
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61 | (1) |
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3.2 Overview of Physical Degradation Mechanisms in Materials |
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62 | (1) |
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63 | (10) |
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63 | (1) |
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3.3.2 Overview of Physical Degradation for Types of Steel Structures |
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64 | (1) |
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65 | (1) |
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3.3.3.1 Hardening Due to Plastic Deformation |
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65 | (1) |
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3.3.3.2 Hydrogen Embrittlement |
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66 | (2) |
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68 | (1) |
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68 | (1) |
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3.3.4 Concrete Degradation |
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68 | (1) |
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3.3.4.1 Concrete Strength in Ageing Structures |
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68 | (2) |
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70 | (1) |
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3.3.4.3 Bacterial Induced Deterioration |
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71 | (1) |
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72 | (1) |
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72 | (1) |
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73 | (4) |
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73 | (1) |
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73 | (1) |
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3.4.3 Various Forms of Corrosion |
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74 | (1) |
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74 | (1) |
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3.4.3.2 Environmental Cracking Due to H2S |
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74 | (1) |
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3.4.3.3 Microbiologically Induced Corrosion |
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74 | (1) |
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3.4.4 Special Issues Related to Corrosion in Hulls and Ballast Tanks |
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75 | (1) |
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3.4.5 Concrete Structures |
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75 | (1) |
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3.4.5.1 Corrosion of Steel Reinforcement |
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75 | (2) |
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3.4.5.2 Corrosion of Prestressing Tendons |
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77 | (1) |
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77 | (8) |
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77 | (3) |
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3.5.2 Factors Influencing Fatigue |
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80 | (1) |
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3.5.3 Implications of Fatigue Damage |
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81 | (2) |
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3.5.4 Fatigue Issues with High Strength Steels |
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83 | (1) |
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84 | (1) |
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85 | (1) |
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85 | (1) |
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3.6.2 Subsidence and Wave in Deck |
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86 | (1) |
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3.7 Dents, Damages, and Other Geometrical Changes |
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86 | (2) |
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3.8 Non-physical Ageing Changes |
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88 | (7) |
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3.8.1 Technological Changes (Obsolescence) |
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88 | (1) |
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3.8.2 Structural Information Changes |
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89 | (1) |
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3.8.3 Knowledge and Safety Requirement Changes |
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90 | (1) |
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91 | (4) |
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4 Assessment of Ageing and Life Extension |
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95 | (48) |
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95 | (2) |
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4.1.1 Assessment Versus Design Analysis |
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96 | (1) |
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4.2 Assessment Procedures |
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97 | (7) |
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97 | (2) |
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4.2.2 Brief Overview of ISO 19902 |
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99 | (2) |
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4.2.3 Brief Overview of NORSOK N-006 |
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101 | (1) |
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4.2.4 Brief Overview of API RP 2A-WSD |
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102 | (1) |
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4.2.5 Brief Overview of ISO 13822 |
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102 | (1) |
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4.2.6 Discussion of These Standards |
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103 | (1) |
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4.3 Assessment of Ageing Materials |
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104 | (3) |
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107 | (8) |
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107 | (1) |
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4.4.2 Strength and Capacity of Damaged Steel Structural Members |
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108 | (1) |
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4.4.2.1 Effect of Metal Loss and Wall Thinning |
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109 | (1) |
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4.4.2.2 Effect of Cracking and Removal of Part of Section |
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110 | (1) |
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4.4.2.3 Effect of Changes to Material Properties |
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110 | (1) |
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4.4.2.4 Effect of Geometric Changes |
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110 | (1) |
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4.4.2.5 Methods for Calculating the Capacity of Degraded Steel Members |
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110 | (1) |
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4.4.3 Strength and Capacity of Damaged Concrete Structural Members |
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111 | (2) |
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4.4.4 Non-Linear Analysis of Jacket of Structures (Push-Over Analysis) |
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113 | (2) |
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4.5 Fatigue Analysis and the S--N Approach |
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115 | (11) |
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115 | (1) |
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4.5.2 Methods for Fatigue Analysis |
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116 | (1) |
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4.5.3 S--N Fatigue Analysis |
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117 | (1) |
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4.5.3.1 Fatigue Loads and Stresses to be Considered |
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117 | (2) |
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4.5.3.2 Fatigue Capacity Based on S--N Curves |
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119 | (2) |
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4.5.3.3 Damage Calculation |
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121 | (1) |
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4.5.3.4 Safety consideration by Design Fatigue Factors |
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122 | (1) |
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4.5.4 Assessment of Fatigue for Life Extension |
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122 | (1) |
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122 | (1) |
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4.5.4.2 High Cycle/Low Stress Fatigue |
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123 | (1) |
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4.5.4.3 Low Cycle/High Stress Fatigue |
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124 | (2) |
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4.6 Fracture Mechanics Assessment |
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126 | (8) |
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126 | (2) |
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4.6.2 Fatigue Crack Growth Analysis |
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128 | (3) |
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4.6.3 Fracture Assessment |
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131 | (1) |
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4.6.4 Fracture Toughness Data |
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132 | (1) |
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4.6.5 Residual Stress Distribution |
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132 | (1) |
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4.6.6 Application of Fracture Mechanics to Life Extension |
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132 | (2) |
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4.7 Probabilistic Strength, Fatigue, and Fracture Mechanics |
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134 | (9) |
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134 | (1) |
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4.7.2 Structural Reliability Analysis -- Overview |
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135 | (1) |
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4.7.3 Decision Making Based on Structural Reliability Analysis |
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136 | (2) |
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4.7.4 Assessment of Existing Structures by Structural Reliability Analysis |
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138 | (1) |
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139 | (4) |
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5 Inspection and Mitigation of Ageing Structures |
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143 | (30) |
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143 | (1) |
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144 | (16) |
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144 | (1) |
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5.2.2 The Inspection Process |
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145 | (2) |
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5.2.3 Inspection Philosophies |
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147 | (1) |
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5.2.4 Risk and Probabilistic Based Inspection Planning |
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148 | (2) |
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5.2.5 Inspection of Fixed Jacket Structures |
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150 | (4) |
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5.2.6 Inspection of Floating Structures |
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154 | (1) |
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5.2.7 Inspection of Topside Structures |
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155 | (3) |
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5.2.8 Structural Monitoring |
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158 | (2) |
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5.3 Evaluation of Inspection Findings |
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160 | (1) |
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5.4 Mitigation of Damaged Structures |
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161 | (7) |
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161 | (2) |
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5.4.2 Mitigation of Corrosion Damage |
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163 | (1) |
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5.4.3 Mitigation of the Corrosion Protection System |
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163 | (3) |
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5.4.4 Mitigation of Fatigue and Other Damage |
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166 | (2) |
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5.5 Performance of Repaired Structures |
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168 | (5) |
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168 | (1) |
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5.5.2 Fatigue Performance of Repaired Tubular Joints |
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168 | (2) |
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5.5.3 Fatigue Performance of Repaired Plated Structures |
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170 | (1) |
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171 | (2) |
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6 Summary and Further Thoughts |
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173 | (4) |
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6.1 Ageing Structures and Life Extension |
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173 | (1) |
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6.2 Further Work and Research Needs Related to Ageing Structures |
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174 | (2) |
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176 | (1) |
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177 | (4) |
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177 | (1) |
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177 | (4) |
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179 | (2) |
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181 | (4) |
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B.1 General Visual Inspection |
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181 | (1) |
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B.2 Close Visual Inspection |
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181 | (1) |
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B.3 Flooded Member Detection |
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181 | (1) |
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182 | (1) |
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B.5 Eddy Current Inspection |
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182 | (1) |
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B.6 Magnetic Particle Inspection |
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182 | (1) |
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B.7 Alternating Current Potential Drop |
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182 | (1) |
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B.8 Alternating Current Field Measurement |
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182 | (1) |
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B.9 Acoustic Emission Monitoring |
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183 | (1) |
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183 | (1) |
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183 | (1) |
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183 | (1) |
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B.13 Structural Monitoring |
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184 | (1) |
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185 | (6) |
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C.1 Example of Closed Form Fatigue Calculation |
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185 | (1) |
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C.2 Example of Application of Fracture Mechanics to Life Extension |
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186 | (5) |
| Index |
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191 | |