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FPSO-DLA_Guide_e - Guide for `Dynamic Loading Approach for...

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Guide for ‘Dynamic Loading Approach’ for Floating Production, Storage and Offloading (FPSO) Installations GUIDE FOR ‘DYNAMIC LOADING APPROACH’ FOR FLOATING PRODUCTION, STORAGE AND OFFLOADING (FPSO) INSTALLATIONS MAY 2010 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright © 2010 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA
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ii ABS GUIDE FOR ‘DYNAMIC LOADING APPROACH’ FOR FPSO INSTALLATIONS . 2010 Foreword Foreword This Guide provides information about the optional classification notation, Dynamic Loading Approach ( DLA ), which is available to qualifying ship-type “Floating Production Installations” (FPIs). This type of offshore installation is usually referred to as a “Floating Storage and Offloading (FSO) System”; or “Floating Production, Storage and Offloading (FPSO) System”, and “FPSO” is the term that will be used herein to denote these ship-type Floating Production Installations. Also, in the text herein, this document is referred to as the “Guide”. Section 1-1-2 of the ABS Guide for Building and Classing Floating Production Installations ( FPI Guide ) contains descriptions of the various, basic and optional classification notations available. Part 5A of the FPI Guid e gives the specific design and analysis criteria applicable to ship-type FPIs (new build ship-type installations and conversions to FPI). In addition to the Rule design criteria, Dynamic Loading Approach based on first-principle direct calculations is acceptable with respect to the determination of design loads and the establishment of strength criteria for ship-type FPIs. In case of any conflict between this Guide and the FPI Guide , the latter has precedence. This Guide represents the most current and advanced ABS DLA analysis procedure including linear and nonlinear seakeeping analysis. This Guide is issued May 2010, and is an extended edition of the ABS Guidance Notes on SafeHull-Dynamic Loading Approach for Floating Production, Storage and Offloading (FPSO) Systems , published in December 2001. Users of this Guide are welcomed to contact ABS with any questions or comments concerning this Guide. Users are advised to check periodically with ABS that this version of this Guide is current.
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ABS GUIDE FOR ‘DYNAMIC LOADING APPROACH’ FOR FPSO INSTALLATIONS . 2010 iii Table of Contents GUIDE FOR ‘DYNAMIC LOADING APPROACH’ FOR FLOATING PRODUCTION, STORAGE AND OFFLOADING (FPSO) INSTALLATIONS CONTENTS SECTION 1 Introduction ............................................................................................ 1 1 Background ......................................................................................... 1 3 Concepts and Benefits of DLA Analysis ............................................. 1 3.1 Concepts ......................................................................................... 1 3.3 Benefits ........................................................................................... 2 3.5 Load Case Development for DLA Analysis ...................................... 2 3.7 General Modeling Considerations ................................................... 3 5 Notations ............................................................................................. 4 7 Scope and Overview of the Following Sections ................................. 4 FIGURE 1 Schematic Representation of the DLA Analysis Procedure ..... 6 SECTION 2 Load Cases ............................................................................................. 7 1 Basic Considerations .......................................................................... 7 3 Vessel Speed ...................................................................................... 7 5 Operational Loading Conditions ......................................................... 7 7 Dominant Load Parameters ................................................................ 8 7.1 Maximum VBM ................................................................................ 8 7.3 Maximum VSF .................................................................................. 9 7.5 Maximum HBM ................................................................................ 9 7.7 Maximum HSF ................................................................................. 9 7.9 Maximum V acc .................................................................................. 9 7.11 Maximum L acc ................................................................................ 10 7.13
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