Levetidsforlengelser for oljeplattformer

Digitalt kurs 26-27. mai
Aldring og levetidsforlengelser for offshore plattformer - utfordringen i å kontrollere strukturell integritet
// Ageing and Life Extension of Offshore Structures - The Challenge of Managing Structural Integrity
2021-05-26 - 2021-05-27 09:00 - 16:30
Siste påmeldingsdag: 2021-05-24 16:00

26 May : Part 1 Focus on ageing mechanisms, codes for life extension and strength and fatigue analysis for life extension
27 May : Part 2 Focus on SIM, inspection, monitoring and repair of ageing structures

Description

Ekofisk
Ekofisk

Many platforms in the Oil and Gas industry have been in production for decades and are reaching the limit of their design life. As they are still used in oil and gas production there is a need for life extension.

This course in 2 Parts will provide a brief understanding of the key ageing issues affecting structures in late life and in life extension and the main problem areas in providing assurance for structural integrity in the life extension phase. This includes recognizing the ageing factors, the relevant regulations and standards such as PSA regulation & HSE Safety Case regulation 14, ISO 19902, ISO 19901-9, NORSOK N-005 and NORSOK N-006. Further, a brief introduction to the assessment of ageing structures, analysis of ageing structures and integrity management of ageing structures, including inspection and repair, will be presented.

The course will be based on the book (included in the course fee!):
Ageing and Life extension of offshore structures
, Wiley 2019. Authors: Ersdal, G., Sharp, J.V, Stacey, A.
Including also separate presentations as pdf.

Lecturers

Gerhard Ersdal, John Sharp, Arne Fjeldstad and Ole Tom Vårdal

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Program 26 May: Part 1
Ageing mechanisms, codes for life extension and strength and fatigue analysis for life extension

09.00 Registration/Login

09.15 Introduction to ageing and life extension
• Offshore facilities: types, demographics and age
• Deterioration and failure statistics of ageing platforms and structures
• Design life, service life and life extension
• Drivers and limits for life extension (economic, environmental, regulatory)
By John Sharp and Gerhard Ersdal

09.45 Ageing factors: changes and issues for life extension
• Main changes, hazards and issues for life extension
• Ageing mechanisms: Corrosion, fatigue, wear, accidental damage, foundation issues, subsidence, extreme weather and other physical ageing effects
• Effects of these ageing changes on the structures
• Non-physical and technological changes
• Historic development in codes and standards
By John Sharp and Gerhard Ersdal

10.45 Coffee

11.00 Relevant regulations, codes, standards and available guidance
• Examples of national regulatory requirements
• Current codes and standards for structures (e.g. ISO & API)
• Available guidance relating to ageing structures and life extension
• Principles for safety of structures in operation and ageing
By John Sharp and Gerhard Ersdal

11.45 Lunch

12:30 Assessment for life extension – part I
• Principles for life extension assessment for structures
• Major hazard management in a life extension context
• Strength analysis for damaged and deteriorated structures
• Evaluation of ageing facilities for watertight integrity
By John Sharp and Gerhard Ersdal

13:30 Advanced methods for strength assessment (DNVGL-RP-C208)
• Issues related to more advanced methods for assessing the safety and robustness of ageing structures
• Non-linear analysis methods
• Relation to codes and standards
By Arne Fjeldstad

14.30 Coffee

14.45 Assessment for life extension – part II
• Fatigue analysis for damaged and deteriorated structures
• Areas of difficulty (Lack of information and uncertainty; un-inspectable components, subsidence, cathodic protection, caissons)
• Decision making
By John Sharp and Gerhard Ersdal

15.45 Case studies – MOU and Jackets – ageing mechanisms and assessment of ageing structures
• Experience of ageing structures – typical results from inspections
• The effect of the fabrication and modifications quality
• Knowledge acquired through examination of more than 1000 fatigue cracks observed in North Sea offshore structures
By Ole Tom Vårdal

16.30 Conclusions
• Major issues for a safe life extension of ageing structures
• Discussion: What improvements and R & D are needed?
• Feedback

16.45 Close of introductory course
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Program 27 May: Part 2
SIM, inspection, monitoring and repair of ageing structures

08.30 Welcome Registration/Login

09.00 Introduction to part 2 – part 1 in a nutshell
• Offshore facilities: types, demographics and age
• Deterioration and failure statistics of ageing platforms and structures
• Relevant regulations, codes, standards and available guidance
• Assessment for life extension
By John Sharp and Gerhard Ersdal

09.15 Managing structural integrity in the life extension phase
• Structural integrity management in ageing and terminal phases
• Development of surveillance plans and inspection plans
• Inspection execution
• Data management
• Evaluation of integrity and introduction to defect assessment
• The role of the structural engineer in emergency response
By John Sharp and Gerhard Ersdal

09.45 Inspection and monitoring method for ageing structures
• Introduction
• Inspection and monitoring methods overview
• Deployment methods
• Competency of inspection personnel
• Reliability of inspection methods
• Inspection of steel and concrete structures, fixed and floating
By John Sharp and Gerhard Ersdal

10.45 Coffee

11.00 Probabilistic fatigue analysis and inspection planning (DNVGL RP-C210)
• Special issues in fatigue analysis of ageing structures
• Probabilistic fatigue analysis and probabilistic inspection planning
Ved Arne Fjeldstad

11:45 Lunch

12.30 Robustness of probabilistic fatigue analysis models and potential for non-conservative conclusions
• The first models from 1985 and present models
• The need to collect data and “validate” your models to avoid unconservative results
• HSE OTO 99 059-61 study
o Over prediction of number of fatigue cracks
o Fatigue cracks not identified by the theoretic analyses
o The importance of gross errors
• Scheduling of detail and weld improvements and inspection that ensure safety for the structure
By Ole Tom Vårdal

13.00 Repair and mitigation of ageing structures
• Introduction
• Repair of steel structures
• Repair of concrete structures
• Repair of corrosion and corrosion protection
• Repair of mooring systems
• Performance of repaired structures
• Challenges related to ceasing production
By John Sharp and Gerhard Ersdal

14.00 Coffee

14.15 Repair of structures. Case Study
• Repair of findings (crack, corrosion, dents, buckling). Examples for jacket structures, semi-Submersibles and FPSO’s
By Arne Fjeldstad

15.15 Experience and inspection of ageing structures – Case Studies – MOU and Jackets
• Quality and management of the inspection process
• Competence requirement for inspection, repair and integrity engineering
• Maintenance of inspection data
• Experience of ageing structures and the effect of the fabrication and modifications quality
By Ole Tom Vårdal

15:45 The Case Veslefrikk B and updated model for the fatigue failure potential
• The findings and repairs performed for Veslefrikk B
• Crack growth from internal defects
• The crack classification (fatigue, fabrication error and other)
• The effect of the weld improvement methods
By Ole Tom Vårdal

16.15 Conclusions
• Basis for a safe life extension of structures
• Sources of further information
• What improvements and R&D is needed?
By Gerhard Ersdal and John Sharp

16.45 Close of course

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Praktiske opplysninger

Tid: Onsdag 26. mai og torsdag 27. mai 2021

Sted: Digitalt kurs via Teams (en lenke til innlogging vil bli sendt deltakerne før kursstart)

Deltakeravgift:
kr. 4 900 per kursdag, for medlemmer i Norsk Forening for Stålkonstruksjoner og Norsk Stålforbund
kr. 5 900 per kursdag, for ikke-medlemmer

Kursene kan tas hver for seg eller samlet:
For deltakelse på begge kursdager får man 10% rabatt på begge kurs.
Det gis ytterligere 10% rabatt dersom man melder på 3 personer fra samme firma.

For medlemmer blir da prisen:
kr. 3 969 per kursdag (min. 3 påmeldte og 2 dagers kurs)
Og for ikke-medlemmer blir prisen:
kr. 4 779 per kursdag (min. 3 påmeldte og 2 dagers kurs)

For søknad om medlemskap, send epost til: post@stalforbund.com

Dokumenter:
Kurset inkluderer kurspresentasjoner som pdf + boka Ageing and Life extension of offshore structures

Administrasjon:
Norsk Stålforbund NFS sekretariat post@stalforbund.com Tel. 41 02 15 98


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