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GB/T 23511-2021: Petroleum and natural gas industries - General requirements for offshore structures
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GB/T 23511-2021: Petroleum and natural gas industries - General requirements for offshore structures

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Petroleum and natural gas industries -- energy requirements for offshore structures ICS 75:180:10 CCSE94 National Standards of People's Republic of China Replacing GB/T 23511-2009 Oil and gas industry General requirements for marine structures (ISO :19900:2019, IDT) Published on 2021-12-31 2022-07-01 Implementation State Administration for Market Regulation Released by the National Standardization Administration directory Foreword V 1 Scope 1 2 Normative references 1 3 Terms and Definitions 2 4 Symbols and Abbreviations 8 4:1 Symbol 8 4:2 Abbreviations8 5 Basic Requirements 9 5:1 General 9 5:2 Structural Integrity Requirements 9 5:3 Functional Requirements 9 5:4 Structure-specific phase requirements 10 5:5 Durability and robustness requirements 10 6 Design/Assessment Fundamentals 11 6:1 General 11 6:2 Platform position and orientation 12 6:3 Natural Environment Conditions 12 6:4 Geological conditions 12 6:5 Specific Design/Assessment Requirements 13 7 Determine design/assessment conditions 15 7:1 Hazards 15 7:2 Hazardous events 15 7:3 Exposure level 16 7:4 Design/Assessment Conditions 17 8 Limit state verification 20 8:1 General 20 8:2 Basic variables and representative values 20 8:3 Limit states 21 8:4 Limit state verification procedure 23 9 Action 23 9:1 Classification of actions 23 9:2 Permanent effects and their representative values 23 9:3 Operation and its representative value 24 9:4 Environmental effects and their representative values 25 9:5 Accidental effects and their representative values 25 9:6 Repetitive action 26 10 Design Values and Partial Coefficients 26 10:1 Design Values of Action 26 10:2 Combination effects 26 10:3 Design value of resistance 27 10:4 Partial factors for operating and extreme design/evaluation conditions 28 10:5 Partial Factors for Rare and Occasional Design/Evaluation Conditions 28 10:6 Partial factor for normal service design/assessment conditions 28 10:7 Partial Factors for Fatigue Design/Assessment Verification 28 10:8 Probabilistic Modeling and Analysis 28 11 Models and Analysis 29 12 Quality Management 29 12:1 General 29 12:2 Installation check 29 12:3 In-Place Inspection, Maintenance and Repair 30 12:4 Records and Design and Construction Documents 30 13 Assessment of Built Structures 31 13:1 General 31 13:2 Condition evaluation 32 13:3 Effect assessment 32 13:4 Resistance assessment 32 13:5 Consequences of Component and System Failure 33 13:6 Mitigation measures 33 Appendix A (Informative) Additional Information and Guidance 34 A:1 Scope 34 A:2 Normative references34 A:3 Terms and Definitions 34 A:4 Symbols and Abbreviations 34 A:5 Basic requirements 34 A:6 Design/Assessment Basis 36 A:7 Determining Design/Assessment Conditions 38 A:8 Limit state verification 42 A:9 Action 45 A:10 Design Values and Partial Coefficients 46 A:11 Models and Analysis 49 A:12 Quality Management 50 A:13 Assessment of Built Structures 50 Reference 51

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules of Standardization Documents" drafted: This document replaces GB/T 23511-2009 "General Requirements for Offshore Structures in the Oil and Gas Industry", and GB/T 23511-2009 In contrast, in addition to editorial changes, the main technical changes are as follows: a) Added terms and definitions such as "rare environmental events", "accidental events", "calibration", "design resistance" and "degradation", changed "design/evaluation" terms and definitions such as “Evaluation Standard” and “Design/Assessment Conditions”, and the terms and definitions such as “Catenary Mooring” and “Compliant Structure” are deleted (see Chapter 3, Chapter 2 of the:2009 edition); b) Changed symbols and abbreviations (see Chapter 4, Chapter 3 of the:2009 edition); c) Changed the provisions of the basic requirements of the structure, and added the description of the general rules (see 5:1); d) Changed the structural integrity requirements that the structure and components should meet (see 5:2, 4:1 of the:2009 edition), and increased the function of the offshore platform: can be required (see 5:3); e) The requirements for specific stages of the structure have been changed, including provisions for construction, structural integrity management and disposal (see 5:4, 4:7,:2009 edition,:2009 edition): 4:11, 4:12); f) Changed the requirements for structural durability, maintenance and inspection (see 5:5:1, 4:2 of the:2009 edition), and increased the structural robustness design requirements provisions (see 5:5:2); g) The requirements for the design/assessment basis of the structure have been changed, and the description of the general rules has been added (see 6:1); h) Changed the regulations on the location and orientation of the platform, natural environment conditions, and geological conditions (see 6:2, 6:3, 6:4, 4:8,:2009 edition 4:10); i) increased the possibility of scouring and ice erosion causing disturbance to the seabed in the design (see 6:4:3); j) Added the design requirements for the superstructure (see 6:5:1); k) Changed the regulations on structural deck elevation (see 6:5:2, 4:9:3 of the:2009 edition); l) Changed the splash zone scope and the provisions of the drainage system (see 6:5:3, 4:9:3 of the:2009 edition); m) Changed the provisions of the structural positioning system (see 6:5:4, 4:9:4 of the:2009 edition); n) Added provisions for riser and riser system (see 6:5:5); o) The provisions for foundation and mooring system are added (see 6:5:6), and the provisions for additional operation requirements are added (see 6:5:7); p) The requirement for structural subdivision is deleted (see 4:9:5 of the:2009 edition); q) The regulations on hazards and hazardous events have been changed (see 7:1 and 7:2, 4:3 of the:2009 edition), and the relevant regulations on exposure levels have been added (see 7:3), the provisions on structural and component design/assessment conditions have been changed (see 7:4, 5:2:2 of the:2009 edition); r) Changed the limit state verification method (see Chapter 8, Chapter 5 of the:2009 edition), added the description of the general rule (see 8:1), changed Provisions for basic variables and representative values (see 8:2, 6:1, 8:2:1 and 8:2:2 of the:2009 edition); s) Changed the provisions of limit state classification (see 8:3:1, 5:1:2 of the:2009 edition); t) Changed the provisions for critical, rare/accidental, in-place and fatigue limit states (see 8:3:2, 8:3:3, 8:3:4 and 8:3:5,:2009 edition 5:1:3, 5:1:4, 5:1:5 and 5:1:6); u) The provisions of limit state verification procedures have been added (see 8:4); v) Changed the provisions of action classification (see 9:1, 6:2:1 of the:2009 edition); w) Changed the provisions of permanent, operational, environmental, accidental, repeated effects and their representative values (see 9:2, 9:3, 9:4, 9:5 and 9:6,:2009 Versions 6:2:1:2, 6:2:1:3, 6:2:1:4, 6:2:1:5 and 6:2:1:6); x) The provisions on the classification of effects according to spatial changes are deleted (see 6:2:2 of the:2009 edition); y) The provisions on the classification of actions according to the response of the structure are deleted (see 6:2:3 of the:2009 edition); z) The provisions on material and soil properties have been changed (see 10:3:2, 6:3 and 8:3 of the:2009 edition); aa) Changed the provisions of geometric parameters (see 10:3:3, 6:4 and 8:4 of the:2009 edition); bb) The provisions on design values and sub-item coefficients have been changed, and the provisions on action design values have been added (see 10:1); cc) Changed the provisions of combined action (see 10:2, 8:2:3 of the:2009 edition); dd) Changed the provisions of soil material design value and geometric variable design value (see 10:3:2 and 10:3:3, 8:3:2 and:2009 edition) 8:4:2), delete the provisions of soil material characteristic value and geometric parameter characteristic value (see 8:3:1 and 8:4:1 of the:2009 edition); ee) Changed the provisions of structural calculation or analysis model uncertainty (see 10:3:4, 8:5 of the:2009 edition); ff) Changed operating and extreme design/assessment conditions, rare and accidental design/assessment conditions, normal use design/assessment conditions, fatigue provisions for subitem action coefficients for design/assessment validation (see 10:4, 10:5, 10:6 and 10:7, 8:6 of the:2009 edition); gg) Added provisions for the use of probabilistic modeling and analysis methods for structures (see 10:8); hh) added analysis procedures and calculation models for structural design/assessment (see Chapter 11 and A:11); i) Changed the provisions for installation inspection, in-place inspection, maintenance and repair of structures (see 12:2 and 12:3, 9:3:4 of the:2009 edition and 9:4); j) The provisions on material inspection and manufacturing inspection of structures are deleted (see 9:3:2 and 9:3:3 of the:2009 edition); kk) Changed the provisions of records and design and construction documents (see 12:4, 9:5 of the:2009 edition); l) Basic requirements for structural design and assessment, design/assessment basis, determination of design/assessment conditions, limit state verification, work Additional guidance on use, design values and partial coefficients, models and analyses (see A:5, A:6, A:7, A:8, A:9, A:10 and A:11): This document is equivalent to ISO :19900:2019 "General Requirements for Offshore Structures for the Oil and Gas Industry": Please note that some content of this document may be patented: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed and managed by the National Petroleum and Natural Gas Standardization Technical Committee (SAC/TC355): This document is drafted by: CNOOC Research Institute Co:, Ltd: The main drafters of this document: Hou Jing, Li Liwei, Song Zijun, Yu Chunjie, Liu Xiaoxia, Wang Chaoyang, Li Yancheng, Sun Youyi, Ni Kankan, Fu Dianfu, Chen Bangmin, An Siyu, Li Wei, Sun Shiyu: This document was first published in:2009 and this is the first revision: Oil and gas industry General requirements for marine structures

1 Scope

This document specifies general requirements and recommendations for the design and assessment of subsea (fixed) and floating (floating) offshore structures: This document applies to all phases of the structural life cycle, including: --- successive stages of construction (including fabrication, transport and installation); --- In-service service stage, including design life and life extension period; --- Disposal stage: This document contains general requirements and recommendations for the design of new structures, structural integrity management and assessment of existing structures: This document does not apply to subsea and riser systems or piping systems:

2 Normative references

The contents of the following documents constitute essential provisions of this document through normative references in the text: Among them, dated citations documents, only the version corresponding to that date applies to this document; for undated references, the latest edition (including all amendments) applies to this document: ISO :19901-1 Particular requirements for marine structures in the oil and gas industry - Part 1: Marine meteorological design and operational requirements (Pe- troleumandnaturalgasindustries-Specificrequirementsforoffshorestructures-Part 1:Metocean designandoperatingconsiderations) ISO :19901-2 Particular requirements for offshore structures in the oil and gas industry - Part 2: Seismic design codes and standards (Petroleumandnaturalgasindustries-Specificrequirementsforoffshorestructures-Part 2:Seismic designproceduresandcriteria) ISO :19901-3 Particular requirements for offshore structures for the oil and gas industry - Part 3: Topside modular structures naturalgasindustries-Specificrequirementsforoffshorestructures-Part 3:Topsidesstructure) ISO :19901-4 Particular requirements for marine structures in the oil and gas industry - Part 4: Geotechnical engineering and foundation design (Petroleum andnaturalgasindustries-Specificrequirementsforoffshorestructures-Part 4: Geotechnicalandfoundationdesignconsiderations) ISO :19901-5 Particular requirements for offshore structures in the oil and gas industry - Part 5: Weight control during design and construction (Petroleumandnaturalgasindustries-Specificrequirementsforoffshorestructures-Part 5:Weight control during engineering and construction) ISO :19901-6 Particular requirements for offshore structures for the oil and gas industry - Part 6: Offshore operations (Petroleum and naturalgasindustries-Specificrequirementsforoffshorestructures-Part 6:Marineoperations) ISO :19901-7 Particular requirements for offshore structures for the oil and gas industry - Part 7: Floating offshore structures and mobile offshore structures Retention system for installations (Petroleum and naturalgasindustries-Specificrequirementsforoffshore structures-Part 7: Stationkeepingsystemsforfloatingoffshorestructuresandmobileoffshoreunits) ISO :19901-8 Particular requirements for marine structures in the oil and gas industry - Part 8: Technical regulations for marine geotechnical investigations (Petro- leumandnaturalgasindustries-Specificrequirementsforoffshorestructures-Part 8:Marinesoil ...