ISO 19903:2019
Petroleum and natural gas industries — Concrete offshore structures
This document specifies requirements and provides recommendations applicable to fixed, floating and grounded concrete offshore structures for the petroleum and natural gas industries and for structures supporting nationally-important power generation, transmission or distribution facility. This document specifically addresses
— the design, construction, transportation and installation of new structures, including requirements for in-service inspection and possible removal of structures,
— the assessment of structures in service, and
— the assessment of structures for reuse at other locations.
This document is intended to cover the engineering processes needed for the major engineering disciplines to establish a facility for offshore operation.
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 General requirements
5.1 General
5.2 Overall planning requirements
5.2.1 General
5.2.2 Quality system
5.2.3 Qualifications of personnel
5.2.4 Documentation
5.3 Functional requirements
5.3.1 General
5.3.2 Position on site
5.3.3 Environmental considerations
5.3.4 Platform operational requirements
5.4 Structural requirements
5.4.1 General
5.4.2 Structural concept requirements
5.4.3 Materials requirements
5.4.4 Execution requirements
5.4.5 Temporary phases requirements
5.5 Design requirements
5.5.1 General
5.5.2 Design actions
5.5.3 Design resistance
5.5.4 Characteristic values for material strength
5.5.5 Partial factors for structural materials
5.5.6 Design by testing
6 Action and action effects
6.1 General
6.1.1 Classification of actions
6.1.2 Determination of action effects
6.2 Environmental actions
6.2.1 General
6.2.2 Wave actions
6.2.3 Current actions
6.2.4 Seismic actions
6.2.5 Ice actions
6.3 Other actions
6.3.1 Permanent actions
6.3.2 Variable actions
6.3.3 Actions from imposed deformations
6.3.4 Accidental actions
6.4 Partial factors for actions
6.5 Combinations of actions
6.6 Exposure levels
7 Structural analyses
7.1 General
7.2 General principles
7.2.1 Planning
7.2.2 Extent of analyses
7.2.3 Analysis requirements
7.2.4 Calculation methods
7.2.5 Verification of analysis results
7.2.6 Documentation
7.3 Physical representation
7.3.1 Geometrical definition
7.3.2 Material properties
7.3.3 Soil-structure interaction
7.3.4 Other support conditions
7.3.5 Actions
7.3.6 Mass simulation
7.3.7 Damping
7.4 Types of analysis
7.4.1 Static linear elastic analysis
7.4.2 Dynamic analysis
7.4.3 Non-linear analysis
7.4.4 Probabilistic analysis
7.4.5 Reliability analysis
7.4.6 Discontinuity region analysis
7.5 Analysis requirements
7.5.1 General
7.5.2 Analysis of construction stages
7.5.3 Transportation analysis
7.5.4 Installation and deck mating analysis
7.5.5 In-service strength and serviceability analysis
7.5.6 Fatigue analysis
7.5.7 Seismic analysis
7.5.8 Analysis of accidental or abnormal design situations
8 Concrete works
8.1 Design
8.1.1 Reference standard for design
8.1.2 Design principles for shell members
8.1.3 Design principles for transverse shear
8.1.4 Design principles for fatigue
8.1.5 Design principles for durability
8.1.6 Design principles for liquid tightness
8.1.7 Design principles for prestressed concrete
8.1.8 Design principles for second order effects
8.1.9 Principles for handling water pressure in pores and cracks
8.1.10 Design principles for discontinuity regions
8.1.11 Design principles for imposed deformations
8.1.12 Increase in strength of concrete with time
8.1.13 Design for fire resistance
8.1.14 Design for earthquakes
8.1.15 Design of embedments
8.1.16 Treatment of early-age and drying shrinkage effects
8.1.17 Partial factors for material
8.2 Materials requirements
8.2.1 General
8.2.2 Concrete constituents
8.2.3 Concrete
8.2.4 Reinforcement
8.2.5 Prestressing steel
8.2.6 Embedded materials
8.3 Execution
8.3.1 Falsework and formwork
8.3.2 Reinforcement
8.3.3 Pre- and post-tensioning
8.3.4 Concreting
8.3.5 Execution with precast concrete elements
8.3.6 Embedded components
8.4 Geometrical tolerances
8.4.1 General
8.4.2 Reference system
8.4.3 Tolerances of structural members
8.4.4 Cross-sectional tolerances
8.4.5 Embedments and penetrations
8.5 Quality control — Inspection, testing and corrective actions
8.5.1 General
8.5.2 Inspection of materials and products
8.5.3 Inspection of execution
9 Foundation design
9.1 General
9.2 Principal elements
9.3 Marine site investigation
9.3.1 Purpose of investigation
9.3.2 Soil investigation
9.3.3 Laboratory investigation
9.4 Characteristic soil parameters
9.5 Partial factors for actions and materials
9.5.1 General
9.5.2 Partial factors for actions
9.5.3 Partial factors for materials
9.6 Geotechnical design principles
9.6.1 General
9.6.2 Dynamic analysis for action effects
9.6.3 SLS
9.6.4 FLS
9.6.5 ULS
9.6.6 ALS
9.7 Bearing capacity
9.8 Soil reactions on structures
9.9 Installation and removal
9.9.1 Sea floor preparation
9.9.2 Installation
9.9.3 Removal
9.10 Scour
10 Mechanical systems
10.1 General
10.2 Permanent mechanical systems
10.2.1 General
10.2.2 Crude oil storage system
10.2.3 Other storage systems
10.2.4 Refrigerated gas storage systems
10.2.5 Permanent ballast water system
10.2.6 Sea water systems
10.2.7 Drains, sumps and bilge
10.2.8 Vents
10.2.9 Safety systems
10.2.10 Decks
10.2.11 Elevators
10.2.12 Lifting devices
10.2.13 Risers and J-tubes
10.2.14 Conductors and shale chutes
10.2.15 Access
10.2.16 HVAC
10.2.17 Structure and foundation condition monitoring
10.2.18 External markings
10.2.19 Other
10.3 Temporary mechanical systems
10.3.1 General
10.3.2 Air cushion system
10.3.3 Temporary ballasting/de-ballasting water system
10.3.4 Grouting and skirt evacuation systems
10.3.5 Instrumentation for construction, tow and installation of the structure
10.3.6 Other systems
10.4 Attachments and penetrations
10.4.1 Attachments
10.4.2 Penetrations
10.4.3 Welding
10.4.4 Corrosion protection
10.5 Special considerations
10.5.1 Design, installation and testing of piping
10.5.2 Design of pipe supports
10.5.3 Design of steel structures
10.5.4 Design of equipment
10.5.5 Dropped object protection
11 Marine operations and construction afloat
11.1 General
11.2 Engineering and planning
12 Corrosion control
12.1 General
12.1.1 Corrosion control in concrete structures
12.1.2 Corrosion zones and environmental parameters affecting corrosivity
12.1.3 Forms of corrosion and associated corrosion rates
12.2 Design for corrosion control
12.2.1 General
12.2.2 Criteria for design of corrosion control
12.2.3 Coatings and linings
12.2.4 Cathodic protection
12.2.5 Corrosion-resistant materials
12.2.6 Corrosion allowance
12.3 Fabrication and installation of systems for corrosion control
12.3.1 General
12.3.2 Coatings and linings
12.3.3 Cathodic protection
12.3.4 Corrosion-resistant materials
13 Topsides interface design
13.1 General
13.2 Basis for design
13.3 Deck/shaft structural connection
13.4 Topsides installation
13.5 Transportation, tow-to-field
14 Inspection and condition monitoring
14.1 General
14.2 Objective
14.3 Personnel qualifications
14.4 Planning
14.4.1 General
14.4.2 Basis for planning of inspection and condition monitoring
14.4.3 Programme for inspection and condition monitoring
14.4.4 Inspection and condition monitoring intervals
14.5 Documentation
14.6 Important items related to inspection and condition monitoring
14.6.1 General
14.6.2 Atmospheric zone
14.6.3 Splash zone
14.6.4 Submerged zone
14.6.5 Internal
14.6.6 Concrete durability
14.6.7 Corrosion protection
14.7 Inspection and condition monitoring types
14.7.1 General
14.7.2 Structural monitoring and structural safety systems
14.8 Marking
14.9 Guidance for inspection of special areas
14.9.1 General concrete surface
14.9.2 Steel transition ring/concrete interface
14.9.3 Construction joints
14.9.4 Penetrations
14.9.5 Vertical intersections between different structural parts
14.9.6 Embedded plates
14.9.7 Repaired areas
14.9.8 Splash zone
14.9.9 Debris
14.9.10 Scour
14.9.11 Differential hydrostatic pressure (drawdown)
14.9.12 Temperature of oil sent to storage
14.9.13 Sulphate reducing bacteria
14.9.14 Post-tensioning
15 Assessment of existing structures
15.1 General
15.2 Structural assessment initiators
15.3 Planning for decommissioning
15.3.1 Planning
15.3.2 Analysis for removal
Bibliography
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Foreword
Introduction
1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 General requirements
5.1 General
5.2 Overall planning requirements
5.2.1 General
5.2.2 Quality system
5.2.3 Qualifications of personnel
5.2.4 Documentation
5.3 Functional requirements
5.3.1 General
5.3.2 Position on site
5.3.3 Environmental considerations
5.3.4 Platform operational requirements
5.4 Structural requirements
5.4.1 General
5.4.2 Structural concept requirements
5.4.3 Materials requirements
5.4.4 Execution requirements
5.4.5 Temporary phases requirements
5.5 Design requirements
5.5.1 General
5.5.2 Design actions
5.5.3 Design resistance
5.5.4 Characteristic values for material strength
5.5.5 Partial factors for structural materials
5.5.6 Design by testing
6 Action and action effects
6.1 General
6.1.1 Classification of actions
6.1.2 Determination of action effects
6.2 Environmental actions
6.2.1 General
6.2.2 Wave actions
6.2.3 Current actions
6.2.4 Seismic actions
6.2.5 Ice actions
6.3 Other actions
6.3.1 Permanent actions
6.3.2 Variable actions
6.3.3 Actions from imposed deformations
6.3.4 Accidental actions
6.4 Partial factors for actions
6.5 Combinations of actions
6.6 Exposure levels
7 Structural analyses
7.1 General
7.2 General principles
7.2.1 Planning
7.2.2 Extent of analyses
7.2.3 Analysis requirements
7.2.4 Calculation methods
7.2.5 Verification of analysis results
7.2.6 Documentation
7.3 Physical representation
7.3.1 Geometrical definition
7.3.2 Material properties
7.3.3 Soil-structure interaction
7.3.4 Other support conditions
7.3.5 Actions
7.3.6 Mass simulation
7.3.7 Damping
7.4 Types of analysis
7.4.1 Static linear elastic analysis
7.4.2 Dynamic analysis
7.4.3 Non-linear analysis
7.4.4 Probabilistic analysis
7.4.5 Reliability analysis
7.4.6 Discontinuity region analysis
7.5 Analysis requirements
7.5.1 General
7.5.2 Analysis of construction stages
7.5.3 Transportation analysis
7.5.4 Installation and deck mating analysis
7.5.5 In-service strength and serviceability analysis
7.5.6 Fatigue analysis
7.5.7 Seismic analysis
7.5.8 Analysis of accidental or abnormal design situations
8 Concrete works
8.1 Design
8.1.1 Reference standard for design
8.1.2 Design principles for shell members
8.1.3 Design principles for transverse shear
8.1.4 Design principles for fatigue
8.1.5 Design principles for durability
8.1.6 Design principles for liquid tightness
8.1.7 Design principles for prestressed concrete
8.1.8 Design principles for second order effects
8.1.9 Principles for handling water pressure in pores and cracks
8.1.10 Design principles for discontinuity regions
8.1.11 Design principles for imposed deformations
8.1.12 Increase in strength of concrete with time
8.1.13 Design for fire resistance
8.1.14 Design for earthquakes
8.1.15 Design of embedments
8.1.16 Treatment of early-age and drying shrinkage effects
8.1.17 Partial factors for material
8.2 Materials requirements
8.2.1 General
8.2.2 Concrete constituents
8.2.3 Concrete
8.2.4 Reinforcement
8.2.5 Prestressing steel
8.2.6 Embedded materials
8.3 Execution
8.3.1 Falsework and formwork
8.3.2 Reinforcement
8.3.3 Pre- and post-tensioning
8.3.4 Concreting
8.3.5 Execution with precast concrete elements
8.3.6 Embedded components
8.4 Geometrical tolerances
8.4.1 General
8.4.2 Reference system
8.4.3 Tolerances of structural members
8.4.4 Cross-sectional tolerances
8.4.5 Embedments and penetrations
8.5 Quality control — Inspection, testing and corrective actions
8.5.1 General
8.5.2 Inspection of materials and products
8.5.3 Inspection of execution
9 Foundation design
9.1 General
9.2 Principal elements
9.3 Marine site investigation
9.3.1 Purpose of investigation
9.3.2 Soil investigation
9.3.3 Laboratory investigation
9.4 Characteristic soil parameters
9.5 Partial factors for actions and materials
9.5.1 General
9.5.2 Partial factors for actions
9.5.3 Partial factors for materials
9.6 Geotechnical design principles
9.6.1 General
9.6.2 Dynamic analysis for action effects
9.6.3 SLS
9.6.4 FLS
9.6.5 ULS
9.6.6 ALS
9.7 Bearing capacity
9.8 Soil reactions on structures
9.9 Installation and removal
9.9.1 Sea floor preparation
9.9.2 Installation
9.9.3 Removal
9.10 Scour
10 Mechanical systems
10.1 General
10.2 Permanent mechanical systems
10.2.1 General
10.2.2 Crude oil storage system
10.2.3 Other storage systems
10.2.4 Refrigerated gas storage systems
10.2.5 Permanent ballast water system
10.2.6 Sea water systems
10.2.7 Drains, sumps and bilge
10.2.8 Vents
10.2.9 Safety systems
10.2.10 Decks
10.2.11 Elevators
10.2.12 Lifting devices
10.2.13 Risers and J-tubes
10.2.14 Conductors and shale chutes
10.2.15 Access
10.2.16 HVAC
10.2.17 Structure and foundation condition monitoring
10.2.18 External markings
10.2.19 Other
10.3 Temporary mechanical systems
10.3.1 General
10.3.2 Air cushion system
10.3.3 Temporary ballasting/de-ballasting water system
10.3.4 Grouting and skirt evacuation systems
10.3.5 Instrumentation for construction, tow and installation of the structure
10.3.6 Other systems
10.4 Attachments and penetrations
10.4.1 Attachments
10.4.2 Penetrations
10.4.3 Welding
10.4.4 Corrosion protection
10.5 Special considerations
10.5.1 Design, installation and testing of piping
10.5.2 Design of pipe supports
10.5.3 Design of steel structures
10.5.4 Design of equipment
10.5.5 Dropped object protection
11 Marine operations and construction afloat
11.1 General
11.2 Engineering and planning
12 Corrosion control
12.1 General
12.1.1 Corrosion control in concrete structures
12.1.2 Corrosion zones and environmental parameters affecting corrosivity
12.1.3 Forms of corrosion and associated corrosion rates
12.2 Design for corrosion control
12.2.1 General
12.2.2 Criteria for design of corrosion control
12.2.3 Coatings and linings
12.2.4 Cathodic protection
12.2.5 Corrosion-resistant materials
12.2.6 Corrosion allowance
12.3 Fabrication and installation of systems for corrosion control
12.3.1 General
12.3.2 Coatings and linings
12.3.3 Cathodic protection
12.3.4 Corrosion-resistant materials
13 Topsides interface design
13.1 General
13.2 Basis for design
13.3 Deck/shaft structural connection
13.4 Topsides installation
13.5 Transportation, tow-to-field
14 Inspection and condition monitoring
14.1 General
14.2 Objective
14.3 Personnel qualifications
14.4 Planning
14.4.1 General
14.4.2 Basis for planning of inspection and condition monitoring
14.4.3 Programme for inspection and condition monitoring
14.4.4 Inspection and condition monitoring intervals
14.5 Documentation
14.6 Important items related to inspection and condition monitoring
14.6.1 General
14.6.2 Atmospheric zone
14.6.3 Splash zone
14.6.4 Submerged zone
14.6.5 Internal
14.6.6 Concrete durability
14.6.7 Corrosion protection
14.7 Inspection and condition monitoring types
14.7.1 General
14.7.2 Structural monitoring and structural safety systems
14.8 Marking
14.9 Guidance for inspection of special areas
14.9.1 General concrete surface
14.9.2 Steel transition ring/concrete interface
14.9.3 Construction joints
14.9.4 Penetrations
14.9.5 Vertical intersections between different structural parts
14.9.6 Embedded plates
14.9.7 Repaired areas
14.9.8 Splash zone
14.9.9 Debris
14.9.10 Scour
14.9.11 Differential hydrostatic pressure (drawdown)
14.9.12 Temperature of oil sent to storage
14.9.13 Sulphate reducing bacteria
14.9.14 Post-tensioning
15 Assessment of existing structures
15.1 General
15.2 Structural assessment initiators
15.3 Planning for decommissioning
15.3.1 Planning
15.3.2 Analysis for removal
Bibliography