1、Guidance Notes on Life Extension Methodology for Floating Production InstallationsGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS JULY 2015 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2015 American Bureau o
2、f Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Foreword Foreword The Guidance Notes on Life Extension Methodology for Floating Production Installations have been developed to provide guidance for assessment of existing floating production installations when the intended period of
3、operation in the original site is extended beyond the original design life period. These Guidance Notes supplement the requirements for life extension of floating production installations in accordance with the ABS Rules for Building and Classing Floating Production Installations. These Guidance Not
4、es outline the life extension process that includes a reassessment of the structure, mooring system, stability, and machinery and systems, etc., for the entire installation. This reassessment includes engineering and survey activities. These Guidance Notes become effective on the first day of the mo
5、nth of publication. Users are advised to check periodically on the ABS website www.eagle.org to verify that this version of these Guidance Notes is the most current. We welcome your feedback. Comments or suggestions can be sent electronically by email to rsdeagle.org. ii ABSGUIDANCE NOTES ON LIFE EX
6、TENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 Table of Contents GUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS CONTENTS SECTION 1 Introduction 1 1 General . 1 SECTION 2 Life Extension Process Overview . 2 1 General . 2 3 Life Extension of Floatin
7、g Production Installations . 2 3.1 Life Extension Procedure 4 3.3 Remaining Fatigue Life . 4 5 Relocation of Floating Production Installations . 4 FIGURE 1 Life Extension Process Flow Chart . 3 SECTION 3 Baseline Information 5 1 General . 5 1.1 Documentation to be Made Available for the Life Extensi
8、on . 5 1.3 Initial Assessment of Baseline Information 6 SECTION 4 Baseline Survey . 7 1 General . 7 3 Structures 7 5 Mooring Systems 7 7 Tendons 8 9 Machinery and Systems 8 11 Additional Scope of Survey and Analysis . 8 SECTION 5 Reassessment 9 1 General . 9 3 Environmental Conditions . 9 5 Hull Str
9、uctures 9 5.1 Ship-Type Installations 9 5.3 Non-Ship Type Installations . 10 5.5 Cathodic Protection Reassessment 11 5.7 Stability Reassessment . 11 5.9 Review of Reassessment Results . 11 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 iii 7 Hull Interfac
10、e Structures . 12 7.1 Strength Reassessment 12 7.3 Remaining Fatigue Strength Assessment 12 7.5 Review of Reassessment Results . 12 9 Topside Structures 12 9.1 Strength Reassessment 12 9.3 Remaining Fatigue Strength Assessment for Non-Ship Type Installations 13 9.5 Review of Reassessment Results . 1
11、3 11 Mooring Systems 13 11.1 Reassessment Analysis . 13 11.3 Cathodic Protection Reassessment . 13 11.5 Review of Reassessment Results . 13 13 TLP Tendons and Tendon Connectors . 14 13.1 Reassessment Analysis . 14 13.3 Cathodic Protection Reassessment . 14 13.5 Tendon Connectors with Nonmetallic Com
12、ponents . 14 13.7 Tendon Tension Monitoring Systems 14 13.9 Review of Reassessment Results . 14 15 Marine and Industrial Machinery and Systems . 14 TABLE 1 Extent of Strength and Fatigue Analysis Scenarios for Life Extension 10 SECTION 6 Re-Inspection/Repairs/ISIP or Survey Plan Revision 15 1 Genera
13、l . 15 3 Additional Surveys 15 5 Repairs and Modifications . 15 7 In-Service Inspection Program 15 SECTION 7 Risk Assessment and Inspection 16 1 Risk Assessment 16 3 Risk-Based Inspection 16 3.1 Risk-Based Inspection Plan Development . 16 3.3 Risk-Based Inspection Plan Execution 17 APPENDIX 1 Proced
14、ure for Fatigue Reassessment of Floating Production Installations (Except for Hull Structures of Ship-Type Installations) . 18 1 Remaining Fatigue Strength of Hull Structures and Hull Interface Structures Non-Ship Type Installations . 18 1.1 Accumulated Fatigue Damage Dp 18 1.3 Safety Factors for Fa
15、tigue Life of the Accumulated Damages . 18 1.5 Predicted Damage for Life Extension 19 1.7 Remaining Fatigue Strength Check . 19 1.9 Calculation Example of Non-inspectable Critical Areas . 20 3 Remaining Fatigue Strength of Topside Structures All FPIs and Major Hull Interface Structures Ship-Type Ins
16、tallations . 20 iv ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 APPENDIX 2 Procedure for Strength and Fatigue Reassessment of Ship-Type FPIs . 21 1 General . 21 3 Initial Scantling Evaluation (ISE) for Life Extension 21 3.1 Strength Evaluation . 21 3.3
17、Simplified Fatigue Evaluation 21 5 Total Strength Assessment (Simplified Fatigue Analysis) for Life Extension . 21 5.1 Model Requirements and Assessment Procedures for Life Extension 21 5.3 Use of As-gauged Scantlings 22 5.5 Loads and Load Cases . 22 5.7 Fatigue Acceptance Criteria 22 7 Dynamic Load
18、ing Approach and Spectral Fatigue Analyses for Life Extension . 23 7.1 Model Requirements and Reassessment Procedures 23 7.3 Loads and Load Cases . 23 7.5 Acceptance Criteria . 23 APPENDIX 3 References 24 1 Application of Codes and Standards 24 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLO
19、ATING PRODUCTION INSTALLATIONS .2015 v This Page Intentionally Left Blank Section 1: Introduction SECTION 1 Introduction 1 General Floating production installations (FPIs) are installed at locations with a specific design life usually aligned with the design field life. A typical default structural
20、design life is 20 years, though there are installations installed with design lives greater or less than 20 years. When an installation approaches the end of its design service life, the Owner/Operator may desire to have it remain on its location and continue in operation. In these instances, the Ow
21、ner/Operator is advised to initiate a life extension process with the Classification Society. This process includes a reassessment of the structure, mooring, tendon systems, stability, machinery and systems, etc., for the entire installation. This reassessment includes engineering and survey activit
22、ies as outlined in Section 2 of this document. These Guidance Notes highlighting the process and methodology for life extension are applicable to floating production installations of all hull forms (i.e., ship-type installations, column stabilized installations, tension leg platforms (TLPs), Spar In
23、stallations (Spars) and hybrid designs, etc.) with the Floating Production and Storage System, Floating Production, Storage and Offloading System, Floating Storage and Offloading System and Floating Offshore Installation notations. It is not applicable to mobile offshore drilling units. The requirem
24、ents for the Life Extension of an installation that remains at the same site are specified in 1-1-2/5.11.5 of the ABS Rules for Building and Classing Floating Production Installations (FPI Rules). The procedure in these Guidance Notes provides further details regarding the steps to be followed in or
25、der to assess an installation for a possible life extension, and also covers those cases where there are changes in the original design parameters or arrangements, for continued operations at the same location. These Guidance Notes are not intended to serve as a design standard, but rather to highli
26、ght the primary activities relating to the life extension procedure for floating production installations. The applicability of this ABS Life Extension process is contingent upon the installation currently being in Class with ABS. Installations with class suspended, unclassed or classed with another
27、 society will be considered on a case-by-case basis. ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 1 Section 2: Life Extension Process Overview SECTION 2 Life Extension Process Overview 1 General Floating installations designed and built to the requireme
28、nts in the Rules and maintained in accordance with the applicable ABS requirements are typically intended to have a structural design life of 20 years. Many are designed for uninterrupted operation onsite without any dry docking. When a floating installation exceeds the original design life, an eval
29、uation is to be made and appropriate actions are to be taken to extend the life up to the new operating life of the installation under the site-specific environmental conditions. 3 Life Extension of Floating Production Installations The requirements for the life extension of an installation that rem
30、ains in the same site are given in 1-1-2/5.11.5 of the FPI Rules. In general, the classification or continuance of classification of an existing installation for extension of service beyond the design life requires special considerations with respect to the review, surveys and structural analyses in
31、 order to re-verify the adequacy of the installation for its extended services. The following procedure will provide more details regarding the steps to be followed in order to assess an installation for a possible life extension, in particular for those cases where there are changes in the original
32、 design parameters and/or arrangements. The general reviews and surveys procedures are described in 2/3.1. The high-level approach for the life extension process is shown in Section 2, Figure 1. Details pertaining to the life extension process are given in Sections 3 through 7. 2 ABSGUIDANCE NOTES O
33、N LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 Section 2 Life Extension Process Overview ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 3 FIGURE 1 Life Extension Process Flow Chart * Note: Risk assessment and Risk-based Inspectio
34、n Plan (Section 7) may be used to supplement the In-Service Inspection Program. Section 2 Life Extension Process Overview 3.1 Life Extension Procedure The general procedure for the classification of an existing installation for extended service is as follows: i) Review original design documentation,
35、 plans, modification records, if any, and survey reports, etc. ii) Survey structure, mooring and machinery to establish condition of installation. The structural surfaces are to be made accessible and cleaned to the Surveyors satisfaction to enable inspection. iii) Review the results of the structur
36、al analysis utilizing results of survey, original plans, MetOcean data and proposed modifications which affect the dead, live, and environmental loads, if applicable, on the structures. iv) Re-survey installation to include updates on critical areas and structural modification deemed necessary based
37、 on any reassessment performed. Make any alterations necessary for extending the service of the installation. v) Verify completion of conditions for granting the life extension. Make any required repairs and modifications. Re-submit the required documents, modified to reflect any warranted changes,
38、for approval (i.e., In-service Inspection Plan (ISIP) or Survey Plan, operations manual, loading manual, etc.). vi) Review the scope of the in-service inspection program or risk-based inspection program to verify the plan modifications as necessary to address results obtained in ii) through iv) abov
39、e that may be necessary to verify the adequacy of the continued service of the installation. Installations under Risk Based Inspection (RBI) where the plan is being adapted/modified for the life extension period will be subject to special consideration. ABS records are to be updated to reflect the e
40、xtended life condition. Class certificate is to be issued for life extension. Where applicable, the existing spectral fatigue analysis (SFA), fatigue life (FL) or remaining fatigue life (RFL) notation with year of maturation is to be updated accordingly. 3.3 Remaining Fatigue Life The remaining fati
41、gue life can be calculated by means of an analysis as described in Appendices 1 and 2. This analysis is sensitive to waves encountered and operating loads during the past service and future prediction, therefore the long-term environmental data are to be properly represented. The fatigue analysis ma
42、y not be needed provided all of the following conditions are satisfied: i) The original fatigue analysis indicates that the fatigue lives of all joints/critical details are sufficient to cover the extension of use. ii) The fatigue environmental data used in the original fatigue analysis remain valid
43、 or are deemed to be more conservative. iii) No cracks are found during the condition survey or damaged joints, members, and their connections are being repaired. iv) Marine growth has been cleaned to the surveyors satisfaction and corrosion is found to be within the allowable design limits. A criti
44、cal area or critical detail is defined in 5A-3-A5/5 and 5A-3-A5/7 of the FPI Rules. 5 Relocation of Floating Production Installations The requirements for relocation of FPIs or significant change in operating conditions are not covered within the scope of these Guidance Notes. These requirements are
45、 specified in the following sections of the FPI Rules: 1-1-2/5.9.3 for strength requirements for ship-shaped FPIs and 1-1-2/5.10.2 for strength requirements for other types of offshore installations and 1-1-2/5.11.4 for fatigue requirements for all types of FPIs, and 1-1-2/15 for significant changes
46、 to the operating conditions. 4 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 Section 3: Baseline Information SECTION 3 Baseline Information 1 General Floating production installation design and operational information is to be collected to allow an engi
47、neering assessment of an installations overall structural integrity. It is essential to have the original design reports, documents, original and as-is plans, specifications, survey records during fabrication, installation and past service. The operator should ensure that any assumptions made are re
48、asonable and information gathered is both accurate and representative of actual conditions at the time of the assessment. If the information cannot be provided, reassessment of the installation is to be required. Actual measurements or testing may be utilized for the reassessment. 1.1 Documentation
49、to be Made Available for the Life Extension i) Drawings General arrangements, tank capacity plan, key structural plans, machinery diagrams and system drawings, foundations connected to hull structure along with associated underdeck reinforcement if added, tank vents and overflow arrangement, corrosion protection plan, T in some cases the extent of analysis may be increased or reduced. 8 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2015 Section 5: Reassessment SECTION 5 Reassessment 1 General The reassessment of an existing installation i
