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GB/T 33508-2017: Recommended practice for riser fatigue
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GB/T 33508-2017: Recommended practice for riser fatigue

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Recommended practice for riser fatigue ICS 75.180.10 E92 National Standards of People's Republic of China Recommended practice for riser fatigue 2017-02-28 released 2017-09-01 implementation General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China China National Standardization Management Committee released Directory Preface III 1 Scope 1 2 normative reference document 1 3 terms, definitions, symbols, codes and abbreviations 1 3.1 Terms and definitions 1 3.2 Abbreviations 5 3.3 Symbol 5 3.4 Greek characters 7 Fatigue design 4.1 General 7 4.2 Use the SN curve for fatigue assessment 4.3 Fatigue Damage Assessment Procedure 10 4.4 Whole Fatigue Analysis Procedure 10 4.5 Fatigue stress 11 4.6 Crack propagation calculation Fatigue assessment 12

5 SN curve

5.1 General 13 5.2 Double slope SN curve. SY/T 10049 13 5.3 Single slope SN curve Exceptions and deletions 5.5 Stress concentration factor 5.6 Selection of SN Curve 14 5.7 SN curve evaluation 15 6 Vortex vibration (VIV) caused by fatigue damage 15 6.1 VIV analysis 6.2 Acceptance Criteria 17 6.3 Simplified fatigue damage assessment 17 6.4 Methods for Relieving VIV 7 combination of fatigue damage 21 7.1 General 21 7.2 Acceptance criteria 21 7.3 Combination of WF and LF Fatigue Damage 21 7.4 Combined with VIV Fatigue Damage 22 Design Fatigue Coefficient 8.1 General 22 8.2 Design Fatigue Coefficient 23 8.3 Safety factor based on enhanced risk 23 8.4 Safety factor for structural reliability analysis based on specific working conditions 8.5 VIV safety factor 30 9 Fatigue Life Life Assessment 31 9.1 In-service fatigue testing 31 9.2 Fatigue life extension 32 9.3 Residual fatigue life assessment 32 Appendix A (Normative Appendix) Fatigue Damage Assessment 34 Appendix B (Normative Appendix) Safety Principles and Safety Level 46 Reference 47 Figure 1 Basic definition of double slope SN curve Figure 2 Calculation of bending stress Figure 3 The general velocity profile of the excitation length (the last case, the two parts are summed out Lexc) 18 Figure 4 (A/Dh) rmsCF is a function of the excitation length Figure 5 (A/Dh) rmsIL/(A/Dh) rmsCF is a function of the cross-flow modulus 19 Figure 6 details step 26 Figure 7 from the response surface to ∂XD/∂Xi 27 Figure A.1 High frequency and low frequency response and combined response Figure A.2 A thick section 40 at the end of the weld Figure A.3 Design life 15 years of safety factor 42 Figure A.4 Design life 20 years of safety factor 43 Figure A.5 Design life 25 years of safety factor 44 Figure A.6 Design life 30 years of safety factor 45 Table 1 Summary of typical fatigue assessment procedures Table 2 Typical riser weld geometry 14 Table 3 Design Fatigue Coefficient DFF 23 Table 4 Safety level factor γSC 24 Table 5 Formula (29) used by the coefficient of 25 Table 6 Random Variables 28 Table B.1 Security Level Classification 46 Table B.2 Acceptable failure probability (per riser per year) Contrast with safety level 46

Foreword

This standard is drafted in accordance with the rules given in GB/T 1.1-2009. Please note that some of the contents of this document may involve patents. The issuer of this document does not assume responsibility for the identification of these patents. This standard is proposed by the National Petroleum Drilling Equipment and Tools Standardization Technical Committee (SAC/TC96). The drafting unit of this standard. National Oil and Gas Drilling Equipment Engineering Technology Research Center, Baoji Petroleum Machinery Co., Ltd., China Petroleum University (Beijing), CNOOC Research Institute, China Oilfield Services Co., Ltd. Drilling Research Institute. The main drafters of this standard. Yang Yugang, Chen Caihu, Zhu Hongwu, Yan Bo, Li Qingping, Wang Chunchun. Recommended practice for riser fatigue

1 Scope

This standard specifies recommended practices for riser fatigue analysis. This standard applies to all types of metal riser fatigue limit state assessment. However, the standard design fatigue coefficients given in 8.2 are only Applicable to steel risers. The evaluation procedure for this standard applies to risers designed in accordance with any recognized specification, such as DNV-OS-F201. Note 1. The purpose of this standard is to describe the metal riser to withstand repeated load fluctuations in the fatigue assessment method, and DNV-OS-F201 recommended fatigue analysis method To supplement. See SY/T 10049. The purpose of fatigue design is to ensure that the riser has sufficient fatigue life. The calculated fatigue life is riser Establish the basis for effective testing procedures during manufacturing and operation. NOTE 2 In order to ensure that the riser performs its intended function, it is advisable to carry out a fatigue assessment of each of the representative risers subjected to fatigue loads (if applicable Fine fatigue analysis support). It should be noted that any component or part of the riser, each welded joint and accessories or other forms of stress concentration is potential Of the fatigue crack source, should be considered separately.

2 normative reference documents

The following documents are indispensable for the application of this document. For dated references, only the dated edition applies to this article Pieces. For undated references, the latest edition (including all modifications) applies to this document. Recommended practice for fatigue strength analysis of offshore steel structures GB/T 10049-2004 ISO 2394..1998 General Principles of Structural Reliability (Generalprinciplesonreliabilityforstructures) BS7910 Guidance on the Method for Evaluating Cracks in Metal Structures (Guideonmethodsforassessingtheacceptabilityof flawsinmetalicstructures DNV-CN-30.6 Structural reliability analysis of marine structures (Structuralreliabilityanalysis ofmarinestruc- tures DNV-OS-E301 mooring positioning (Positionmooring) DNV-OS-F201 dynamic riser (Dynamicrisers) DNV-RP-C205 Environmental conditions and environmental loads (Environmentalconditions and environmentalloads) DNV-RP-F204..2010 riser fatigue recommended practice (RiserFatigue) UKDOE. 1984 UK Department of Energy Offshore Facilities Design and Construction Guide (Offshoreinstalations. Guidanceon designandconstruction 3 terms, definitions, symbols, codes and abbreviations 3.1 Terms and definitions The following terms and definitions apply to this document. 3.1.1 Corrosion margin corrosionalowance The pipe or component wall thickness allows for an increase in corrosion and/or erosion and/or wear. 3.1.2 Design fatigue coefficient designfatiguefactors; The safety factor is used to increase the probability of avoiding fatigue failure. Life should be applied DFF, the calculated fatigue life should be longer than the service life ...