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GB/T 35989.1-2018: Petroleum and natural gas industries -- Floating offshore structures -- Part 1: Monohulls, semi-submersibles and spars
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Petroleum and natural gas industries -- Floating offshore structures -- Part 1: Monohulls, semi-submersibles and spars
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Basic data | Standard ID | GB/T 35989.1-2018 (GB/T35989.1-2018) | | Description (Translated English) | Petroleum and natural gas industries -- Floating offshore structures -- Part 1: Monohulls, semi-submersibles and spars | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | E94 | | Classification of International Standard | 75.180.10 | | Word Count Estimation | 150,174 | | Date of Issue | 2018-02-06 | | Date of Implementation | 2018-09-01 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 35989.1-2018: Petroleum and natural gas industries -- Floating offshore structures -- Part 1: Monohulls, semi-submersibles and spars
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Petroleum and natural gas industries-Floating offshore structures-Part 1. Monohulls, semi-submersibles and spars
ICS 75.180.10
E94
National Standards of People's Republic of China
Oil and gas industry offshore floating structures - Part 1.
Monohull, semi-submersible platform and deep draft platform
Floatingoffshorestructures-Part 1. Monohuls, semi-submersiblesandspars
(ISO .19904-1.2006, IDT)
Published on.2018-02-06
2018-09-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China
China National Standardization Administration issued
Content
Foreword IX
1 Scope 1
2 Normative references 1
3 Terms and Definitions 1
4 symbols and abbreviations 6
4.1 Symbol 6
4.2 Abbreviations 6
5 Overall considerations 7
5.1 Functional Requirements 7
5.2 Security Requirements 8
5.3 Planning Requirements 8
5.3.1 Overview 8
5.3.2 Design basis 8
5.3.3 Design Practice 8
5.3.4 Inspection and Maintenance Principle 9
5.4 Standards and Recommended Practices 9
5.4.1 Overview 9
5.4.2 Application in project implementation 9
5.5 General requirements 9
5.5.1 Overview 9
5.5.2 Structural Design Principles 10
5.5.3 Design Guidelines 10
5.5.4 Operational and operational considerations 11
5.5.5 Hydrostatic stability 11
5.5.6 Subdivision 11
5.5.7 Weight Control 11
5.5.8 Overall response 11
5.5.9 Positioning System 12
5.5.10 Material 12
5.6 Independent verification 12
5.7 Analysis Tools 12
5.8 In-service inspection and maintenance 12
5.9 Existing Floating Structure Assessment 12
5.10 Reuse of existing platforms 13
6 Basic design requirements 13
6.1 Overview 13
6.2 Exposure level 13
6.2.1 Overview 13
6.2.2 Level of life safety 13
6.2.3 Consequence classification 14
6.2.4 Exposure level determination 15
6.3 Limit state 16
6.3.1 Overview 16
6.3.2 Restricted working conditions of floating structures 16
6.4 Design Status 16
6.4.1 Overview 16
6.4.2 Limit state design conditions 16
6.4.3 Operational Limits Design Conditions 16
6.4.4 Design conditions for fatigue control conditions 17
6.4.5 Design conditions for unexpected control conditions 17
6.4.6 Temporary status 17
7 role and effect 17
7.1 Overview 17
7.2 Permanent action (G) 17
7.3 Variable action (Q) 18
7.4 Unexpected effects (A) 18
7.4.1 Overview 18
7.4.2 Collision 18
7.4.3 Falling objects 19
7.4.4 Fires and explosions 19
7.5 Environmental role (E) 19
7.5.1 Overview 19
7.5.2 Environmental data for specific sites 19
7.5.3 Wind effect 20
7.5.4 Flow effect 21
7.5.5 Wave action 21
7.5.6 Vortex-induced vibration and motion 24
7.5.7 Sea creatures 24
7.5.8 Ice and snow accumulation 24
7.5.9 Direct action of ice 24
7.5.10 Temperature effect 25
7.5.11 Tidal effects 25
7.5.12 Geological disasters 25
7.6 Other effects 25
7.6.1 Positioning system function 25
7.6.2 Sloshing effect 25
7.7 Repetitive effects 25
7.8 Combination of functions 26
8 Overall analysis 26
8.1 Overview 26
8.2 Static and Average Response Analysis 26
8.2.1 Overview 26
8.2.2 Static balance under hydrostatic conditions 26
8.2.3 Average response analysis 26
8.3 Overall dynamic characteristics 27
8.3.1 Overview 27
8.3.2 Analysis model 27
8.3.3 Quality 27
8.3.4 Damping 28
8.3.5 Stiffness 28
8.3.6 Role classification 28
8.4 Frequency Domain Analysis 28
8.5 Time Domain Analysis 28
8.6 Uncoupled analysis 28
8.7 Coupling analysis 29
8.8 Resonance excitation and response 29
8.9 Platform Offset 29
8.10 Air gap 29
8.11 Platform motion and acceleration 29
8.12 Model test 30
8.13 Design scenario for structural analysis 30
8.13.1 Overview 30
8.13.2 Short-term response analysis 30
8.13.3 Long-term response analysis 30
8.13.4 Design Wave Analysis 30
9 Structural considerations 31
9.1 Overview 31
9.2 Typical value of action 31
9.2.1 Overview 31
9.2.2 The role of the operating state Typical value 31
9.2.3 The role of the temporary state Typical value 32
9.2.4 Force at the interface 32
9.3 Design dimensions 32
9.4 Model 33
9.4.1 Overview 33
9.4.2 Overall Model 33
9.4.3 Local model 33
9.4.4 Response Assessment 34
9.4.5 Model Validation 34
9.5 Structural Analysis 34
9.5.1 General principles 34
9.5.2 Linear Analysis 35
9.5.3 Nonlinear Analysis 35
9.6 Structural strength 36
9.6.1 Typical value of strength 36
9.6.2 Yield strength 36
9.6.3 Buckling strength 36
9.7 Design Check 36
9.7.1 Overview 36
9.7.2 Operating Limit Condition (SLS) Deformation Limit 36
9.7.3 Partial coefficient design method 37
9.7.4 Working stress design method 38
9.7.5 Reliability-based approach 39
9.8 Special Design Matters 40
9.8.1 Overview 40
9.8.2 Sniper 40
9.8.3 Shanglang 40
9.8.4 Sway 40
9.8.5 Wave impact on the elevated deck 40
9.8.6 Local structures and components 40
9.9 Material 41
9.9.1 Overview 41
9.9.2 Material selection 41
9.9.3 Pulling force in the thickness direction 42
9.9.4 Aluminum support structure 42
9.10 Corrosion protection of steel 42
9.11 Prefabrication and construction 42
9.11.1 Overview 42
9.11.2 Inspections and tests in prefabrication and construction 42
9.12 Offshore operations 43
9.13 Upper block/hull interface 43
10 Fatigue Analysis and Design 43
10.1 Overview 43
10.2 Fatigue damage design safety factor 44
10.3 Method Summary 44
10.4 Environmental Data 45
10.5 Structural Model 45
10.6 Hydrostatic Analysis 46
10.7 Response amplitude operator and action combination 46
10.8 Stress and Stress Concentration Factor (SCFs) 46
10.9 Stress amplitude calculation and distribution 46
10.10 Fatigue resistance 47
10.11 Cumulative damage 47
10.12 Fracture mechanics method 47
10.13 Fatigue Sensitive Components and Nodes 47
11 monohull 47
11.1 Overview 47
11.2 General Design Guidelines 48
11.2.1 Collision protection 48
11.2.2 Deck house requirements 48
11.2.3 Swaying 48
11.2.4 Dawn on the deck 48
11.3 Structural strength 48
11.3.1 Overview 48
11.3.2 Scale 48
11.3.3 Limit Limit Condition (ULS-a, ULS-b) Longitudinal Strength Check 49
11.3.4 Local strength and detail 50
11.3.5 Upper block support 50
11.3.6 Load Monitoring 50
12 semi-submersible platform 51
12.1 Overview 51
12.2 General Design Guidelines 51
12.2.1 Overview 51
12.2.2 Limit 51
12.2.3 Damage tolerance 51
12.3 Structural strength 51
12.3.1 Critical Connections 51
12.3.2 Structural details 52
13 Deep draft column platform 52
13.1 Overview 52
13.2 General Design Requirements 52
13.2.1 Model test 52
13.2.2 Static balance position 52
13.2.3 Overall role impact 52
13.2.4 Local effects 53
13.3 Structural strength 53
13.3.1 Key Interface 53
13.3.2 Fatigue 53
13.3.3 Structural details 53
14 Reconstruction and reuse 53
14.1 Overview 53
14.2 Minimum standards for design, construction and maintenance 54
14.3 Structural inspection before reconstruction 54
14.4 Effects before use for alteration 54
14.4.1 Overview 54
14.4.2 Monohull 54
14.4.3 Semi-submersible platform 55
14.4.4 Fatigue damage caused by previous use 55
14.5 Corrosion resistance and material suitability 55
14.5.1 Corrosion protection 55
14.5.2 Applicability of materials 55
14.6 Inspection and Maintenance 55
15 Hydrostatic stability and subdivision 56
15.1 Overview 56
15.2 Tilt test 56
15.3 Subdivision 56
15.4 Watertight and weathertight devices 56
15.5 Special requirements for monohulls 57
16 Mechanical System 57
16.1 Overview 57
16.2 Hull system 57
16.2.1 Overview 57
16.2.2 Bilge water system 57
16.2.3 Ballast system 59
16.2.4 Cabin sounding and ventilation systems 61
16.2.5 Cargo Operating System 61
16.2.6 Inert gas system 62
16.2.7 Crude Oil Washing (COW) System 63
16.3 Input and Output System 63
16.3.1 Overview 63
16.3.2 General functions of risers 63
16.3.3 riser connection 63
16.3.4 Unloading system 63
16.3.5 Material Delivery 64
16.3.6 Lifting device 64
16.4 Fire Protection System 65
16.4.1 Overview 65
16.4.2 Structural Fire Protection System 65
16.4.3 Fire Water System 65
16.4.4 Fixed fire extinguishing system 65
16.4.5 Alarm 65
17 positioning system 65
17.1 Overview 65
17.2 Mooring Equipment 66
17.2.1 Winch 66
17.2.2 Guide and chain stop 66
17.2.3 Monitoring and control equipment 66
17.2.4 Releasable mooring 66
17.3 turret 66
17.3.1 Overview 66
17.3.2 turret structure 67
17.3.3 Bearing system 67
17.3.4 Rotating and Locking System 68
18 Inspection, monitoring and maintenance during use 68
18.1 Overview 68
18.2 Structural Integrity Management System Principles 68
18.2.1 Overview 68
18.2.2 Establishing databases and obtaining data 69
18.2.3 Evaluation 69
18.2.4 Plan 70
18.2.5 Implementation 70
18.3 Plan to consider 70
18.3.1 Overview 70
18.3.2 Inspection Type 70
18.4 Implementation Matters 71
18.4.1 Staff qualification 71
18.4.2 Equipment Certificate 72
18.4.3 Inspection procedure 72
18.4.4 Inspection Preparation 72
18.4.5 Inspection results and actions 73
18.4.6 Maintenance procedures 73
18.4.7 Monitoring procedures 73
18.5 Minimum requirements 73
18.5.1 Overview 73
18.5.2 Minimum inspection requirements for the main structure 74
18.5.3 Minimum inspection requirements for structural and non-structural attachments 75
18.5.4 Inspection results and actions 76
18.5.5 Tank test and water tightness 76
Appendix A (informative) Additional information and guidance 78
References 131
Foreword
GB/T 35989 "Oil and Natural Gas Industry Floating Structure" is divided into two parts.
--- Part 1. Monohull, semi-submersible platform and deep draft column platform;
--- Part 2. Tension leg platform (TLP).
This part is the first part of GB/T 35989.
This part is drafted in accordance with the rules given in GB/T 1.1-2009.
This part uses the translation method equivalent to ISO .19904-1.2006 "Oil and natural gas industry offshore floating structure Part 1. Monomer
Boat, semi-submersible platform and deep draft platform.
This part is proposed and managed by the National Oil and Gas Standardization Technical Committee (SAC/TC355).
This section drafted by. CNOOC Research Institute.
The main drafters of this section. Shi Zhongmin, Qu Yan, Du Qinggui, Feng Wei, Xiao Yue, Jiang Zhe, Feng Jiaguo, Liu Wei.
Oil and gas industry offshore floating structures - Part 1.
Monohull, semi-submersible platform and deep draft platform
1 Scope
This part of GB/T 35989 specifies the design of offshore floating structures used by offshore oil for drilling, production, storage and external transmission functions.
Calculate and evaluate technical requirements.
This section applies to three types of steel floating structures of monohull, semi-submersible platform and deep draft column platform.
2 Normative references
The following documents are indispensable for the application of this document. For dated references, only dated versions apply to this article.
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 20660-2006 Requirements and guidelines for fire, explosion control and mitigation measures for offshore production units in the oil and gas industry
(ISO 13702.1999, IDT)
GB/T 23511-2009 General requirements for marine structures in the oil and gas industry (ISO .19900.2002, IDT)
ISO .19901-1.2005 Particular requirements for the marine structure of the oil and gas industry - Part 1
(Petroleum and naturalgasindustries- Specificrequirementsforoffshorestructures-Part 1.
Metoceandesignandoperatingconsiderations)
Petroleum and natural gas industries -- Particular requirements for marine structures - Part 7
Structure positioning system (Petroleum and naturalgasindustries-Specificrequirementsforoffshorestruc-
tures-Part 7.Stationkeepingsystemsforfloatingoffshorestructuresandmobileoffshoreunits)
ISO .19902.2007 Oil and gas industry fixed marine steel structure (Petroleum and naturalgasindustries-
Fixedsteeloffshorestructures)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Abnormal abnormal
Exceeding the normal design conditions, it is different from the minimum probability event.
3.2
Accident accidental
The structure or its affiliates are subject to accidents or abnormalities.
For example. impact, fire, explosion, partial failure or the pressure difference in the design disappears (eg buoyancy).
3.3
Action action
Structural external loads (direct effects) or factors that can cause deformation or acceleration factors (indirect effects).
For example, manufacturing errors, installation, seating, temperature changes, or humidity changes can cause structural deformation.
Note. Earthquake effects usually produce acceleration.
3.4
Action combination actioncombination
In the structural design check, a combination of different effects simultaneously applied to the structure in a specific limit state.
3.5
Action effect
The effect produced by the action of the structural members.
For example. internal forces, bending moments, stresses, strains, rigid body displacements or elastic deformations.
3.6
Air gap airgap
The gap between the highest point of the water surface in an extreme marine environment and the lowest point in the design that is not subject to the structure of the wave impact.
3.7
Basic parameter basicvariable
One of a series of parameters that characterize physical properties such as action, environmental impact, geometry, material properties, and soil properties.
3.8
Eigenvalue
A value inherent to a particular underlying variable, effect, or strength model that is not affected by other influencing factors.
Note. For a function and its corresponding characteristics, the eigenvalue is usually related to the period.
3.9
Design criteria designcriteria
Under each extreme operating condition, describe the formula or criteria that are required to meet the conditions.
3.10
Design form designformat
A mathematical expression for checking to verify that the limit state is not exceeded.
Note. In this section, the working stress method (WSD) and the partial coefficient method can be used.
3.11
Design service lifedesignservicelife
The expected life of a structural or structural component, provided that it can be implemented. Within this period, the structure can be allowed to enter
Maintenance, but no major repairs are required.
3.12
Design condition designation
A set of physical conditions in the structural design that do not exceed the limit state during a certain recurrence period.
3.13
Design value designvalue
The value of the underlying variables, effects, or strength models used in the design verification process.
Note 1. For the limit state (ULS) design check method based on the partial coefficient form, the design value of the strength variable or model can be divided by its typical value by the partial system.
The number is obtained and the design value of the action can be obtained by multiplying its typical value by the partial coefficient.
Note 2. For the fatigue limit state (FLS) based on the partial coefficient form, the normal operating limit state (SLS) or the accidental limit state (ALS) design checker
Method, all the partial coefficients take 1 and the design value is equal to the typical value.
Note 3. For any calibration method based on the working stress method, all the partial coefficients are taken as 1, and the design value is equal to the typical value. Approximate overall safety
The coefficient or the coefficient is used for design verification.
Note 4. For effects and related characteristics, the value can be related to the return period.
3.14
Dynamic action
The magnitude is large enough to cause structural or structural components to produce acceleration effects that require special consideration.
3.15
Dynamic positioning dynamicpositioning; DP
Dynamic positioning technology refers to the technology that mainly uses the ship's own propeller system for positioning. The propeller is resisted by generating thrust.
Often or slow drifting.
3.16
Exposure level exposurelevel
A grading system that determines structural requirements based on life safety, environmental, and economic consequences of structural failure.
3.17
Failure failure
Insufficient strength or incomplete function of structural or structural components or failure to meet their limit state requirements during structural verification.
3.18
Adaptive fit-for-purpose
Although the standard requirements for locality are not met, the design intent of the standard ensures that failure of the area does not result in failure.
Accepted life safety consequences or environmental hazards.
3.19
Floating structure floatingstructure
A structure in which all weight can be supported by buoyancy.
Note. All weights include empty ship weight, pre-tension of mooring system, riser pre-tension and operating weight.
3.20
Freeboard freeboard
The vertical distance between the upper deck of the hull (or the top of the continuous structure) and the average water surface for a given draught condition.
3.21
Shanglang greenwater
The waves romantically cross the deck, causing slamming and pressure on the deck structure.
3.22
Limit state limitstate
After the structure is exceeded, the structure no longer meets the design criteria.
3.23
Mobile movable drilling unit mobileoffshoredrilingunit;MODU
The structure of drilling and workover operations can be carried out during the exploration and development of subsea oil.
3.24
Marine mobile device mobileoffshoreunit; MOU
A structure that can be moved to different sea areas to perform its specific functions.
3.25
Monohull monohul
A floating structure consisting of a single continuous casing, similar in shape to sea vessels, barges, etc.
3.26
Nominal value
The values of the underlying variables, effects, or strength models determined based on non-statistical methods are usually obtained based on empirical or actual conditions.
For example. the values given in a recognized standard or specification.
3.27
Owner owner
Representatives of single or multiple companies with development rights may represent the parties with joint development rights as operators.
3.28
Platform platform
A complete structure consisting of a structural body, an upper block, a lower foundation, or a positioning system, if any.
3.29
Well-known classification society recognizedclassificationsociety; RCS
Member of the International Association of Classification Societies (IACS), with recognized qualifications and experience in the field of floating structures, and developed for oil or day
The classification/inspection certification procedures and procedures for the production of activity facilities (these facilities are located at a particular location for a long period of time).
3.30
Reliability
The ability of a structural or structural component to meet specified requirements.
3.31
Typical value
The value of the underlying variable, action, or strength model used to check a limit state.
Note 1. Typical values can be equal to eigenvalues, nominal values or other reasonably determined values.
Note 2. For the effect, the typical value may be related to the higher or lower eigenvalue, and the value depends on which condition causes the condition to be more unfavorable. Combination should
In the process, you can multiply the coefficient by more than or less than 1.
3.32
Resistance resistance
The ability of a structure, component, or component section to withstand effects and not exceed a limit state.
3.33
Return period returnperiod
The average time interval between occurrences of an event or the average time interval over which a particular value is exceeded.
Note. The ocean engineering community usually uses years to measure the return period of environmental events. The return period measured in years is equal to the reciprocal of the probability of occurrence beyond the year of the event.
3.34
Riser riser
A pipe that connects a treatment facility or drilling equipment on a floating structure to an underwater facility, a subsea pipeline, or an oil reservoir.
Note. Possible functions of the riser include drilling and workover, production, injection, underwater system control, and oil and gas transportation.
3.35
Robust robustness
The ability of the structure to resist events occurring at a reasonable probability level, ie the structure does not cause disproportionately serious damage due to a certain
as a result of.
Note. Possible causes such as fire, explosion or collision.
3.36
Semi-submersible platform semi-submersible
A floating structure usually consisting of a deck structure, some large-span large-section support columns, and underwater buoys connected to the columns.
Note. Reasonable selection of the geometry of the pontoon/column can reduce the overall motion response of the platform under a wide range of wave loads.
3.37
Slamming slamming
Part of the structure has an impact with high pressure peaks when it collides with water.
Note. Sniping may be caused by water in the lower part of the hull or due to wave slap on the structural components.
3.38
Sloshing
The impact of fluid movement in a non-full load tank on the bulkhead.
3.39
Deep draft column platform sparplatform/spar
An upright single-column platform with a deep draft (drinking more than 100m).
3.40
Special area specialareas
A particularly important area identified by the designer that affects structural integrity and safety.
3.41
Stability
Hydrostatic stability
The floating structure produces a returning moment that deviates from the equilibrium position to return the structure to an equilibrium state.
3.42
Static action
Does not cause significant acceleration effects of structural or structural components.
3.43
Positioning system stationkeepingsystem
A system capable of limiting the offset of the floating structure within a prescribed range.
3.44
Structure
A combination of components designed to withstand and provide sufficient stiffness.
3.45
Structural component
A physically distinguishable structural part.
3.46
Structural system
A combination of structural members that work together.
3.47
Upper module topsides
A collection of structures and equipment that are placed on a support structure (fixed or floating) to provide some or all of the platform's functionality.
Note. For a monohull, the deck is not part of the upper module.
3.48
Variable action
The effect that the amplitude varies with time compared to the mean cannot be ignored, or the effect of the point of action changes with time.
3.49
Verification verification
Verification to verify that an activity, a product, or a service meets the specified requirements.
3.50
Watertight watertight
The ability to prevent water from penetrating into or entering the structure under the design of water pressure conditions in the surrounding structure.
3.51
Weathertight
When the structure is temporarily exposed to water, it prevents the ability of water to penetrate the structure.
Note. Watertight closures are also considered to be weathertight.
4 symbols and abbreviations
4.1 symbol
The following symbols and definitions apply to this document.
A. Area, or unit length area, in square meters (m2), or meters (m).
Av. vibration amplitude in meters (m).
B. Type width, in meters (m).
C. Coefficient, if not specified, is a dimensionless quantity.
d. member diameter in meters (m).
E. Material modulus of elasticity (Young's modulus) in Newtons per square meter (N/m2).
F. The unit length acts in units of Newtons per meter (N/m).
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