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Chapter 20 Spectral Fatigue Analysis and Design                       389

                 20.5.6  Drawing Verification
                 Design  drawings corresponding to  this design task  should be  verified  according to  design
                 results, for correctness and acceptability.  Non-conforming drawings are to be revised and/or
                documented depending on their acceptability in the task technical report.


                20.6  Classification Society Interface
                20.6.1  Submittal and Approval of Design Brief
                The design brief is submitted to the classification society for review, comments, and approval.
                The classification society’s comments are to be  incorporated into the  design brief and  the
                revised design brief will be reissued. If necessary, the analysis should be repeated to verify and
                validate the analysis results and design brief revisions.

                20.6.2  Submittal and Approval of Task Report
                A technical task report is issued after the analysis is completed to document the analysis and
                design results. This report should follow the analysis methodology documented in the design
                brief  and  discuss any variations from the design brief.  The task report includes supporting
                information, hand calculations and computer output.
                This task report and  supplemental calculations are submitted to the classification society for
                review,  comment,  and  approval  and  will  be  available to  the  post-design  personnel  for
                reference during fabrication.
                20.6.3  Incorporation of Comments from Classification Society
                Comments on the design brief and the task report should be incorporated into the applicable
                revised document. The revised document is issued for record and final approval, if required.

                20.7  References
                1.   ABS  (2002), “Rule  for  Building and  Classing Steel Vessels”, American  Bureau  of
                     Shipping.
                2.   API (1997), “Recommended Practice for Planning, Designing, and Constructing Tension
                     Leg  Platforms”, API Recommended  Practice  2T  (RP  2T),  First  Edition,  American
                     Petroleum Institute.
                3.   API  (2001),  “API RP  2FPS,  Recommended  Practice  for  Planning,  Designing  and
                     Constructing Floating Production Systems”, First Edition.
                4.   AWS  (1997),  “AWS  Structural Welding  Code  -  Steel,  AWS  Dl.1-96”,  American
                     Welding Society.
                5.   Bai, Y. (2001), “Pipelines and Risers”, Elsevier Ocean Engineering Book Series, Vol. 3.
                6.   BSI (1993),  “BSI 7608-Code for Practice for Fatigue Design and Assessment of Steel
                     Structures”, British Institute of Standards.
                7.   DNV  (2000), “RP-C203, Fatigue Strength Analysis of Offshore Steel Structures”, Det
                     Norske Veritas.
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