dnv offshore design presentation 1
TRANSCRIPT
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OFFSHORE OFFSHORE STRUCTURAL DESIGNSTRUCTURAL DESIGN
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Introduction Introduction
• Define the subject matterDefine the subject matter• Design philosophy;Design philosophy;
Taguchi’s theory of robust design; Deming’s Taguchi’s theory of robust design; Deming’s principles of quality control; Quality Function principles of quality control; Quality Function Deployment; Design for Manufacture; Concurrent Deployment; Design for Manufacture; Concurrent Engineering; etc.Engineering; etc.
• Accuracy of Factor of Design (LRFD v WSD)Accuracy of Factor of Design (LRFD v WSD)• LEAN APPROACH TO DESIGNLEAN APPROACH TO DESIGN• R4D – Research for DesignR4D – Research for Design• AEE - Advanced Engineering EnvironmentAEE - Advanced Engineering Environment
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Generic mechanical engineering design processGeneric mechanical engineering design process
START
Recognition of a need
Definition of the problem
Design synthesis
Evaluation of preliminary designs
Detailed design
END
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OFFSHORE FIELD DEVELOPMENT PLANOFFSHORE FIELD DEVELOPMENT PLAN
ACQUIRE
EXPLORE & APPRAISE
DEVELOP
OPERATE
DECOMMISSION
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Feasibility Studies
Preliminary Design
Final Design
Reservoir Management
Drilling & Well Plans
FacilitiesPlatform
Offtake
Economics
External Constraints
Environmental Criteria
Offshore Development Design Spiral
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DESIGN WORK;DESIGN WORK;ancient structures, ancient ancient structures, ancient thinkingthinking
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DESIGN WORK;DESIGN WORK;recent past offshore structuresrecent past offshore structures
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DESIGN WORK;DESIGN WORK;modern thinkingmodern thinking
Detailed Design
Design Synthesis
AEE
Need Recognition
LEAN DESIGN
R4D
Evaluation&
Selection
Problem Definition
Preliminary Designs
Continuou
s Learning
CL
AS
S
ST
AN
DA
RDTEAM
WORK
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OFFSHORE STRUCTURESOFFSHORE STRUCTURESMajor Classes of Loads Considerations
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TUBULAR JOINT DESIGNTUBULAR JOINT DESIGN
• Design Methods LRFD; WSDDesign Methods LRFD; WSD
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LRFD DNV OS C101LRFD DNV OS C101
• Load & Resistance Factor Design:Load & Resistance Factor Design:deterministic based, data gathered by observation of model testing or monitoring deterministic based, data gathered by observation of model testing or monitoring of full size structureof full size structure
• Limit States:Limit States: ULS, FLS, ALS, SLSULS, FLS, ALS, SLS
• Structural element design Ref. DNV OS C401Structural element design Ref. DNV OS C401
• Fatigue Ref. DNV RP C203Fatigue Ref. DNV RP C203
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WSD DNV OS C201WSD DNV OS C201
• Working or Allowable Stress Design:Working or Allowable Stress Design:deterministic based, data gathered by observation of model deterministic based, data gathered by observation of model testing or monitoring of full size structure; sensitive fatigue testing or monitoring of full size structure; sensitive fatigue analysis necessaryanalysis necessary
• Joints to be designed to minimise stress concentrations and Joints to be designed to minimise stress concentrations and reduce complex stress flow patternreduce complex stress flow pattern
• Structural element Ref. DNV OS C401Structural element Ref. DNV OS C401
• Fatigue Ref. DNV RP C203Fatigue Ref. DNV RP C203
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Summary Offshore Summary Offshore EngineeringEngineering
• Offshore engineering is a process of group Offshore engineering is a process of group activity and it brings together a large activity and it brings together a large number of expertise in order to fulfil it’s number of expertise in order to fulfil it’s objectives.objectives.
• The aims of structures & structural The aims of structures & structural element design are:element design are:
1.1. Sustain loadsSustain loads2.2. Maintain acceptable safetyMaintain acceptable safety3.3. Posses adequate durabilityPosses adequate durability