1、 Guidance Notes on Life Extension Methodology for Floating Production Installations GUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS MAY 2017 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 2017 American Bureau of Shippin
2、g. All rights reserved. ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Foreword Foreword (1 May 2017) The Guidance Notes on Life Extension Methodology for Floating Production Installations have been developed to provide guidance for assessment of existing floating production installations wh
3、en the intended period of operation at the original site or the cumulated operating time at both the original and relocated sites is extended beyond the original design life period. These Guidance Notes supplement the requirements for life extension and relocation of floating production installation
4、s in accordance with the ABS Rules for Building and Classing Floating Production Installations (FPI Rules). These Guidance Notes outline the life extension process that includes a reassessment of the structure, mooring system, stability, and machinery and systems, etc., for the entire installation.
5、This reassessment includes engineering and survey activities. The following major changes are incorporated in this revision: In Section 2, two scenarios are considered separately when life extension is at the same location. For first life extension up to five years, an abbreviated approval procedure
6、 without reassessment may be followed. For life extension over five years, a general approval procedure is to be followed. New Section 7 introduces an alternative route for life extension when an installation is under Asset Integrity Management (AIM). These Guidance Notes become effective on the fir
7、st day of the month 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. Terms of Use Th
8、e information presented herein is intended solely to assist the reader in the methodologies and/or techniques discussed. These Guidance Notes do not and cannot replace the analysis and/or advice of a qualified professional. It is the responsibility of the reader to perform their own assessment and o
9、btain professional advice. Information contained herein is considered to be pertinent at the time of publication, but may be invalidated as a result of subsequent legislations, regulations, standards, methods, and/or more updated information and the reader assumes full responsibility for compliance.
10、 This publication may not be copied or redistributed in part or in whole without prior written consent from ABS. ii ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2017 Table of Contents GUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTA
11、LLATIONS CONTENTS SECTION 1 Introduction 1 1 General . 1 SECTION 2 Life Extension Process Overview . 2 1 General . 2 3 Life Extension of Floating Production Installations . 2 3.1 Procedure for Life Extension up to 5 Years at the Same Location . 4 3.3 Procedure for Life Extension Over 5 Years at the
12、Same Location . 6 3.5 Life Extension Procedure for an Installation Relocating to a New Location . 8 3.7 Remaining Fatigue Life . 8 FIGURE 1A Life Extension Process Flow Chart Based on Phases 3 FIGURE 1B Life Extension Abbreviated Procedure (For life extension up to 5 years at the same location) . 5
13、FIGURE 1C Life Extension Procedure (For life extension of over 5 years at the same location) . 7 SECTION 3 Baseline Information 9 1 General . 9 1.1 Documentation to be Provided during Life Extension Process 9 1.3 Initial Assessment of Baseline Information 10 SECTION 4 Baseline Survey . 11 1 General
14、. 11 3 Structures 11 5 Mooring Systems 11 7 Tendons 12 9 Machinery and Systems 12 11 Outfitting 12 13 Additional Scope of Survey and Analysis . 13 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2017 iii SECTION 5 Reassessment 14 1 General . 14 3 Environmental
15、Conditions . 14 5 Hull Structures 14 5.1 Ship-Type Installations 14 5.3 Non-Ship Type Installations . 15 5.5 Cathodic Protection Reassessment . 16 5.7 Stability Reassessment . 16 5.9 Review of Reassessment Results . 16 7 Hull Interface Structures . 17 7.1 Strength Reassessment 17 7.3 Remaining Fatig
16、ue Strength Assessment 17 7.5 Review of Reassessment Results . 17 9 Topside Structures 17 9.1 Strength Reassessment 17 9.3 Remaining Fatigue Strength Assessment for Non-Ship Type Installations 18 9.5 Review of Reassessment Results . 18 11 Mooring Systems 18 11.1 Reassessment Analysis . 18 11.3 Catho
17、dic Protection Reassessment . 18 11.5 Review of Reassessment Results . 18 13 TLP Tendons and Tendon Connectors . 19 13.1 Reassessment Analysis . 19 13.3 Cathodic Protection Reassessment . 19 13.5 Tendon Connectors with Nonmetallic Components . 19 13.7 Tendon Tension Monitoring Systems 19 13.9 Review
18、 of Reassessment Results . 19 15 Marine and Industrial Machinery and Systems . 19 TABLE 1 Extent of Strength and Fatigue Analysis Scenarios for Life Extension 15 SECTION 6 Additional Survey/Repairs/ISIP . 20 1 General . 20 3 Additional Surveys 20 5 Repairs and Modifications . 20 7 Revision of In-Ser
19、vice Inspection Plan (ISIP) . 20 SECTION 7 Asset Integrity Management (AIM) 21 1 General . 21 3 AIM Process 21 5 Life Extension in AIM Process 21 FIGURE 1 Assessment for Life Extension within the AIM Process 22 iv ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS
20、.2017 SECTION 8 Risk Assessment . 23 1 Risk Assessment 23 APPENDIX 1 Procedure for Fatigue Reassessment of Floating Production Installations (Except for Hull Structures of Ship-Type Installations) . 24 1 Remaining Fatigue Strength of Hull Structures and Hull Interface Structures Non-Ship Type Instal
21、lations 24 1.1 Accumulated Fatigue Damage Dp . 24 1.3 Safety Factors for Fatigue Life of the Accumulated Damages . 24 1.5 Predicted Damage for Life Extension 25 1.7 Remaining Fatigue Strength Check . 25 1.9 Calculation Example of Non-inspectable Critical Areas . 26 3 Remaining Fatigue Strength of To
22、pside Structures All FPIs and Major Hull Interface Structures Ship-Type Installations . 26 APPENDIX 2 Procedure for Strength and Fatigue Reassessment of Ship-Type FPIs . 27 1 General . 27 3 Initial Scantling Evaluation (ISE) for Life Extension 27 3.1 Strength Evaluation . 27 3.3 Simplified Fatigue E
23、valuation 27 5 Total Strength Assessment (Simplified Fatigue Analysis) for Life Extension 27 5.1 Model Requirements and Assessment Procedures for Life Extension . 27 5.3 Use of As-gauged Scantlings 28 5.5 Loads and Load Cases . 28 5.7 Fatigue Acceptance Criteria 28 7 Dynamic Loading Approach and Spe
24、ctral Fatigue Analyses for Life Extension . 29 7.1 Model Requirements and Reassessment Procedures 29 7.3 Loads and Load Cases . 29 7.5 Acceptance Criteria . 29 APPENDIX 3 References 30 1 Application of Codes and Standards 30 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INS
25、TALLATIONS .2017 v This Page Intentionally Left Blank Section 1: Introduction SECTION 1 Introduction 1 General (1 May 2017) Floating production installations (FPIs) are facilities designed for site-specific application based on a design life usually defined by the Owner/Operator. A typical default s
26、tructural design life is 20 years, though there are installations with other specified design lives. For different reasons, Owner/Operators may seek to keep the unit in operation beyond the original design life, either in the same location or at a different site. In these instances, the Owner/Operat
27、or is advised to initiate a life extension process with the assistance of 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
28、 activities 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),
29、 Spar Installations (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. Thes
30、e Guidance Notes cover the following life extension scenarios: i) Life extension for continued services at the same location Option 1: Life extension of up to five years for an installation remaining at the same location. This option presents an abbreviated procedure per 2/3.1. Option 2: Life extens
31、ion of over five years for an installation remaining at the same location. This procedure is presented in 2/3.3. ii) Life extension procedure for continued services at a different area of operation (See 2/3.5) The requirements for the Life Extension of an installation that remains at the same site a
32、re 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 order to assess an installation for a possible life extension, and also covers t
33、hose cases where there are changes in the original design parameters or arrangements, for continued operations. These Guidance Notes are not intended to serve as a design standard, but rather to highlight the primary activities relating to the life extension procedure for floating production install
34、ations. These Guidance Notes present a methodology that can be applied in the life extension for continued services process. As such, it may be applied to units classed by ABS, not classed by ABS or without class. ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS
35、.2017 1 Section 2: Life Extension Process Overview SECTION 2 Life Extension Process Overview 1 General Floating installations designed and built to the requirements in the Rules and maintained in accordance with the applicable ABS requirements are typically intended to have a structural design life
36、of 20 years. Many are designed for uninterrupted operation onsite without any dry docking. When a floating installation exceeds the original design life, an evaluation 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
37、site-specific environmental conditions. 3 Life Extension of Floating Production Installations (1 May 2017) The requirements for the life extension of an installation that remains in the same site are given in 1-1-2/5.11.5 of the FPI Rules. In general, the classification or continuance of classificat
38、ion 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 order to re-verify the adequacy of the installation for its extended services. The following procedure will provide more deta
39、ils 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 design parameters and/or arrangements. The general reviews and surveys procedures are described in 2/3.1 and 2/3.3. The life
40、extension process generally follows the three phases listed below and is also shown in Section 2, Figure 1A: i) Investigation phase Data collection and engineering assessment Baseline survey ii) Determination phase Reassessment Provision of conditions for life extension iii) Implementation phase Con
41、ditions implemented The detailed life extension process is shown in Section 2, Figures 1B and 1C. Details pertaining to the life extension process are given in Sections 3 through 8. 2 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2017 Section 2 Life Extension
42、 Process Overview FIGURE 1A Life Extension Process Flow Chart Based on Phases (1 May 2017) ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2017 3 Section 2 Life Extension Process Overview 3.1 Procedure for Life Extension up to 5 Years at the Same Location If th
43、e first life extension request for an installation remaining at the same location is five years or less, the following abbreviated approval procedure is to be followed. If a baseline survey is performed and all required structural repairs are completed, the life extension may be granted without the
44、need for data collection. The life extension process is shown in Section 2, Figure 1B. To be granted life extension under these terms, the following conditions are to be satisfied: Any modifications to the structure have class approval. Critical areas of the original design have been re-examined usi
45、ng NDT techniques and verified to be satisfactory. Additional items to be determined on a case-by-case basis during the life extension process have been resolved. Life extension is a continuous process that extends the original life. This abbreviated process can only be applied once in the lifecycle
46、 of a Floating Production Installation. Once a unit has been granted life extension under this option (abbreviated process), additional requests for life extension will be considered as the total additional life beyond the original design life in accordance with the full procedure as described in 2/
47、3.3. For example, if the design life of an installation is 20 years and it receives a life extension of five years, a second five-year life extension will be a ten-year extension to the original design life. If FL or RFL notation was granted for the unit under consideration, to use this abbreviate p
48、rocedure, the original fatigue analysis is to show that the fatigue lives of all joints/critical details are sufficient to cover the extension of use. When the original fatigue analysis show insufficient remaining fatigue life for the requested extension, the FL or RFL notation needs to be specially
49、 considered. 4 ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2017 Section 2 Life Extension Process Overview FIGURE 1B Life Extension Abbreviated Procedure (For life extension up to 5 years at the same location) (1 May 2017) ABSGUIDANCE NOTES ON LIFE EXTENSION METHODOLOGY FOR FLOATING PRODUCTION INSTALLATIONS .2017 5 Section 2 Life Extension Process Overview 3.3 Procedure for Life Extension Over 5 Years at the Same Location The general procedure, which is shown in Section 2, Figure 1C, for the classification of an existin
