ISO 19901-3:2010
Petroleum and natural gas industries — Specific requirements for offshore structures — Part 3: Topsides structure
ISO 19901-3:2010 gives requirements for the design, fabrication, installation, modification and structural integrity management for the topsides structure for an oil and gas platform. It complements ISO 19902, ISO 19903, ISO 19904‑1, ISO 19905‑1 and ISO 19906, which give requirements for various forms of support structure. Requirements in ISO 19901-3:2010 concerning modifications and maintenance relate only to those aspects that are of direct relevance to the structural integrity of the topsides structure.
The actions on (structural components of) the topsides structure are derived from ISO 19901-3:2010, where necessary in combination with other International Standards in the ISO 19901 series. The resistances of structural components of the topsides structure can be determined by the use of international or national building codes, as specified in ISO 19901-3:2010. If any part of the topsides structure forms a primary structural component of the overall structural system of the whole platform, the requirements of ISO 19901-3:2010 are supplemented with applicable requirements in ISO 19902, ISO 19903, ISO 19904‑1, ISO 19905‑1 and ISO 19906.
ISO 19901-3:2010 is applicable to the topsides of offshore structures for the petroleum and natural gas industries, as follows:
- topsides of fixed offshore structures;
- discrete structural units placed on the hull structures of floating offshore structures and mobile offshore units;
- certain aspects of the topsides of arctic structures.
ISO 19901-3:2010 is not applicable to those parts of the superstructure of floating structures that form part of the overall structural system of the floating structure; these parts come under the provisions of ISO 19904‑1. ISO 19901-3:2010 only applies to the structure of modules on a floating structure that do not contribute to the overall integrity of the floating structural system.
ISO 19901-3:2010 is not applicable to the structure of hulls of mobile offshore units.
ISO 19901-3:2010 does not apply to those parts of floating offshore structures and mobile offshore units that are governed by the rules of a recognized certifying authority and which are wholly within the class rules.
Some aspects of ISO 19901-3:2010 are also applicable to those parts of the hulls of floating offshore structures and mobile offshore units that contain hydrocarbon processing, piping or storage.
ISO 19901-3:2010 contains requirements for, and guidance and information on, the following aspects of topsides structures:
- design, fabrication, installation and modification;
- in-service inspection and structural integrity management;
- assessment of existing topsides structures;
- reuse;
- decommissioning, removal and disposal;
- prevention, control and assessment of fire, explosions and other accidental events.
ISO 19901-3:2010 applies to structural components including the following:
- primary and secondary structure in decks, module support frames and modules;
- flare structures;
- crane pedestal and other crane support arrangements;
- helicopter landing decks (helidecks);
- permanent bridges between separate offshore structures;
- masts, towers and booms on offshore structures.
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1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 Overall considerations
5.1 Design situations
5.2 Codes and standards
5.2.1 Limit state and allowable stress design philosophies
5.2.2 Use of national codes and standards
5.3 Deck elevation and green water
5.4 Exposure level
5.5 Operational considerations
5.5.1 Function
5.5.2 Spillage and containment
5.6 Selecting the design environmental conditions
5.7 Assessment of existing topsides structures
5.8 Reuse of topsides structure
5.9 Modifications and refurbishment
6 Design requirements
6.1 General
6.2 Materials selection
6.3 Design conditions
6.4 Structural interfaces
6.5 Design for serviceability limit states (SLS)
6.5.1 General
6.5.2 Vibrations
6.5.2.1 Sources of vibration
6.5.2.2 Design limits
6.5.2.3 Long-period vibrations
6.5.2.4 Dynamic analysis and avoidance of resonance
6.5.3 Deflections
6.6 Design for ultimate limit states (ULS)
6.7 Design for fatigue limit states (FLS)
6.8 Design for accidental limit states (ALS)
6.9 Robustness
6.10 Corrosion control
6.11 Design for fabrication and inspection
6.12 Design considerations for structural integrity management
6.13 Design for decommissioning, removal and disposal
6.13.1 General
6.13.2 Structural releases
6.13.3 Lifting appurtenances
6.13.4 Heavy lift and set-down operations
7 Actions
7.1 General
7.2 In-place actions
7.3 Action factors
7.3.1 Design action for in-place situations with permanent and variable actions only
7.3.2 Design actions for equipment testing
7.3.3 Design action for in-place situations due to extreme environmental actions
7.3.4 Design actions for in-place situations with operating environmental actions
7.4 Vortex-induced vibrations
7.5 Deformations
7.6 Wave and current actions
7.7 Wind actions
7.8 Seismic actions
7.8.1 General
7.8.2 Minimum lateral acceleration
7.8.3 Equipment and appurtenances
7.9 Actions during fabrication and installation
7.9.1 General
7.9.2 Fabrication
7.9.3 Loadout, transportation and installation
7.10 Accidental situations
7.10.1 General
7.10.2 Evaluation of accidental situations
7.10.2.1 General
7.10.2.2 Probability of occurrence and severity of accidental events
7.10.2.3 Risk assessment
7.10.2.3.1 General
7.10.2.3.2 Risk matrix
7.10.3 Hydrocarbon incidents
7.10.4 Explosion
7.10.5 Fire
7.10.6 Explosion and fire interaction
7.10.7 Vessel collision
7.10.8 Dropped and swinging objects and projectiles
7.10.9 Loss of buoyancy
7.10.10 Strong vibration
7.11 Other actions
7.11.1 Drilling operations
7.11.2 Conductors
7.11.3 Risers
7.11.4 Caissons
7.11.5 Maintenance, mechanical handling and lifting aids
7.11.6 Bridge supports
8 Strength and resistance of structural components
8.1 Use of local building standards
8.2 Cylindrical tubular member design
8.3 Design of non-cylindrical sections
8.3.1 General
8.3.2 Plate girder design
8.3.3 Box girder sections
8.3.4 Stiffened plate structures
8.3.5 Stressed skin structures
8.4 Connections
8.4.1 General
8.4.2 Restraint and shrinkage
8.4.3 Bolted connections
8.5 Castings
9 Structural systems
9.1 Topsides design
9.1.1 General
9.1.2 Topsides on concrete support structures
9.1.3 Topsides on floating structures
9.2 Topsides structure design models
9.2.1 General
9.2.2 Support structure model for topsides design
9.2.3 Topsides model for topsides design
9.2.4 Modelling for design of equipment and piping supports
9.3 Support structure interface
9.3.1 Responsibility
9.3.2 Static strength design
9.3.3 Fatigue design
9.4 Flare towers, booms, vents and similar structures
9.5 Helicopter landing facilities (helidecks)
9.5.1 General
9.5.2 Construction
9.5.3 Design actions and resistances
9.5.3.1 Design situations
9.5.3.2 Design requirements
9.5.3.3 Helicopter emergency landing situation
9.5.3.4 Helicopter-at-rest situation
9.5.3.5 Representative strengths and partial resistance factors
9.5.3.6 Safety net arms and framing
9.5.3.7 Helicopter tie-down points
9.5.4 Reassessment of existing helidecks
9.6 Crane support structure
9.6.1 General
9.6.2 Static design
9.6.3 Dynamic design
9.6.4 Fatigue design
9.7 Derrick design
9.8 Bridges
9.9 Bridge bearings
9.10 Anti-vibration mountings for modules and major equipment skids
9.11 System interface assumptions
9.12 Fire protection systems
9.13 Penetrations
9.14 Difficult-to-inspect areas
9.15 Drainage
9.16 Actions due to drilling operations
9.17 Strength reduction due to heat
9.18 Walkways, laydown areas and equipment maintenance
9.19 Muster areas and lifeboat stations
10 Materials
10.1 General
10.2 Carbon steel
10.3 Stainless steel
10.3.1 General
10.3.2 Types of stainless steel
10.3.3 Material properties
10.4 Aluminium alloys
10.4.1 General
10.4.2 Types of aluminium
10.4.3 Material properties
10.4.4 Thermite sparking
10.5 Fibre-reinforced composites
10.6 Timber
11 Fabrication, quality control, quality assurance and documentation
11.1 Assembly
11.1.1 General
11.1.2 Grating
11.1.3 Landing and stairways
11.1.4 Temporary attachments
11.2 Welding
11.3 Fabrication inspection
11.4 Quality control, quality assurance and documentation
11.5 Corrosion protection
11.5.1 Coatings
11.5.2 Under deck areas
12 Corrosion control
12.1 General
12.2 Forms of corrosion, associated corrosion rates and corrosion damage
12.3 Design of corrosion control
12.3.1 General
12.3.2 Considerations in the design of corrosion control
12.3.3 Coatings, linings and wrappings
12.3.4 Corrosion-resistant materials
12.3.5 Corrosion allowance
12.4 Fabrication and installation of corrosion control
12.4.1 General
12.4.2 Coatings and linings
12.4.3 Corrosion-resistant materials
12.5 In-service inspection, monitoring and maintenance of corrosion control
12.5.1 General
12.5.2 Coatings and linings
12.5.3 Corrosion-resistant materials
13 Loadout, transportation and installation
14 In-service inspection and structural integrity management
14.1 General
14.2 Particular considerations applying to topsides structures
14.2.1 Corrosion protection systems
14.2.2 Access routes, floors and gratings
14.2.3 Supports for safety-critical equipment, including communications, electrical and firewater systems
14.2.4 Control of hot work (e.g. welding and cutting)
14.2.5 Accidental actions
14.2.6 Change control
14.3 Topsides structure default inspection scopes
14.3.1 General
14.3.2 Baseline inspection
14.3.3 Periodic inspection
14.3.4 Special inspections
14.3.5 Unscheduled inspections
15 Assessment of existing topsides structures
16 Reuse of topsides structure
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1 Scope
2 Normative references
3 Terms and definitions
4 Symbols and abbreviated terms
4.1 Symbols
4.2 Abbreviated terms
5 Overall considerations
5.1 Design situations
5.2 Codes and standards
5.2.1 Limit state and allowable stress design philosophies
5.2.2 Use of national codes and standards
5.3 Deck elevation and green water
5.4 Exposure level
5.5 Operational considerations
5.5.1 Function
5.5.2 Spillage and containment
5.6 Selecting the design environmental conditions
5.7 Assessment of existing topsides structures
5.8 Reuse of topsides structure
5.9 Modifications and refurbishment
6 Design requirements
6.1 General
6.2 Materials selection
6.3 Design conditions
6.4 Structural interfaces
6.5 Design for serviceability limit states (SLS)
6.5.1 General
6.5.2 Vibrations
6.5.2.1 Sources of vibration
6.5.2.2 Design limits
6.5.2.3 Long-period vibrations
6.5.2.4 Dynamic analysis and avoidance of resonance
6.5.3 Deflections
6.6 Design for ultimate limit states (ULS)
6.7 Design for fatigue limit states (FLS)
6.8 Design for accidental limit states (ALS)
6.9 Robustness
6.10 Corrosion control
6.11 Design for fabrication and inspection
6.12 Design considerations for structural integrity management
6.13 Design for decommissioning, removal and disposal
6.13.1 General
6.13.2 Structural releases
6.13.3 Lifting appurtenances
6.13.4 Heavy lift and set-down operations
7 Actions
7.1 General
7.2 In-place actions
7.3 Action factors
7.3.1 Design action for in-place situations with permanent and variable actions only
7.3.2 Design actions for equipment testing
7.3.3 Design action for in-place situations due to extreme environmental actions
7.3.4 Design actions for in-place situations with operating environmental actions
7.4 Vortex-induced vibrations
7.5 Deformations
7.6 Wave and current actions
7.7 Wind actions
7.8 Seismic actions
7.8.1 General
7.8.2 Minimum lateral acceleration
7.8.3 Equipment and appurtenances
7.9 Actions during fabrication and installation
7.9.1 General
7.9.2 Fabrication
7.9.3 Loadout, transportation and installation
7.10 Accidental situations
7.10.1 General
7.10.2 Evaluation of accidental situations
7.10.2.1 General
7.10.2.2 Probability of occurrence and severity of accidental events
7.10.2.3 Risk assessment
7.10.2.3.1 General
7.10.2.3.2 Risk matrix
7.10.3 Hydrocarbon incidents
7.10.4 Explosion
7.10.5 Fire
7.10.6 Explosion and fire interaction
7.10.7 Vessel collision
7.10.8 Dropped and swinging objects and projectiles
7.10.9 Loss of buoyancy
7.10.10 Strong vibration
7.11 Other actions
7.11.1 Drilling operations
7.11.2 Conductors
7.11.3 Risers
7.11.4 Caissons
7.11.5 Maintenance, mechanical handling and lifting aids
7.11.6 Bridge supports
8 Strength and resistance of structural components
8.1 Use of local building standards
8.2 Cylindrical tubular member design
8.3 Design of non-cylindrical sections
8.3.1 General
8.3.2 Plate girder design
8.3.3 Box girder sections
8.3.4 Stiffened plate structures
8.3.5 Stressed skin structures
8.4 Connections
8.4.1 General
8.4.2 Restraint and shrinkage
8.4.3 Bolted connections
8.5 Castings
9 Structural systems
9.1 Topsides design
9.1.1 General
9.1.2 Topsides on concrete support structures
9.1.3 Topsides on floating structures
9.2 Topsides structure design models
9.2.1 General
9.2.2 Support structure model for topsides design
9.2.3 Topsides model for topsides design
9.2.4 Modelling for design of equipment and piping supports
9.3 Support structure interface
9.3.1 Responsibility
9.3.2 Static strength design
9.3.3 Fatigue design
9.4 Flare towers, booms, vents and similar structures
9.5 Helicopter landing facilities (helidecks)
9.5.1 General
9.5.2 Construction
9.5.3 Design actions and resistances
9.5.3.1 Design situations
9.5.3.2 Design requirements
9.5.3.3 Helicopter emergency landing situation
9.5.3.4 Helicopter-at-rest situation
9.5.3.5 Representative strengths and partial resistance factors
9.5.3.6 Safety net arms and framing
9.5.3.7 Helicopter tie-down points
9.5.4 Reassessment of existing helidecks
9.6 Crane support structure
9.6.1 General
9.6.2 Static design
9.6.3 Dynamic design
9.6.4 Fatigue design
9.7 Derrick design
9.8 Bridges
9.9 Bridge bearings
9.10 Anti-vibration mountings for modules and major equipment skids
9.11 System interface assumptions
9.12 Fire protection systems
9.13 Penetrations
9.14 Difficult-to-inspect areas
9.15 Drainage
9.16 Actions due to drilling operations
9.17 Strength reduction due to heat
9.18 Walkways, laydown areas and equipment maintenance
9.19 Muster areas and lifeboat stations
10 Materials
10.1 General
10.2 Carbon steel
10.3 Stainless steel
10.3.1 General
10.3.2 Types of stainless steel
10.3.3 Material properties
10.4 Aluminium alloys
10.4.1 General
10.4.2 Types of aluminium
10.4.3 Material properties
10.4.4 Thermite sparking
10.5 Fibre-reinforced composites
10.6 Timber
11 Fabrication, quality control, quality assurance and documentation
11.1 Assembly
11.1.1 General
11.1.2 Grating
11.1.3 Landing and stairways
11.1.4 Temporary attachments
11.2 Welding
11.3 Fabrication inspection
11.4 Quality control, quality assurance and documentation
11.5 Corrosion protection
11.5.1 Coatings
11.5.2 Under deck areas
12 Corrosion control
12.1 General
12.2 Forms of corrosion, associated corrosion rates and corrosion damage
12.3 Design of corrosion control
12.3.1 General
12.3.2 Considerations in the design of corrosion control
12.3.3 Coatings, linings and wrappings
12.3.4 Corrosion-resistant materials
12.3.5 Corrosion allowance
12.4 Fabrication and installation of corrosion control
12.4.1 General
12.4.2 Coatings and linings
12.4.3 Corrosion-resistant materials
12.5 In-service inspection, monitoring and maintenance of corrosion control
12.5.1 General
12.5.2 Coatings and linings
12.5.3 Corrosion-resistant materials
13 Loadout, transportation and installation
14 In-service inspection and structural integrity management
14.1 General
14.2 Particular considerations applying to topsides structures
14.2.1 Corrosion protection systems
14.2.2 Access routes, floors and gratings
14.2.3 Supports for safety-critical equipment, including communications, electrical and firewater systems
14.2.4 Control of hot work (e.g. welding and cutting)
14.2.5 Accidental actions
14.2.6 Change control
14.3 Topsides structure default inspection scopes
14.3.1 General
14.3.2 Baseline inspection
14.3.3 Periodic inspection
14.3.4 Special inspections
14.3.5 Unscheduled inspections
15 Assessment of existing topsides structures
16 Reuse of topsides structure