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APPENDIX 1 - FREE SPAN ANALYSIS - 12INCH 12INCH PRODUCTION PRODUCTION PIPE SU TU NAU PROJECT-DNV RP-F105 FREE SPANNING PIPELINE Project_info
"SU TU NAU FIELD DEVELOPMENT"
"As-Laid Case "
Pipeline_Description
"12inch Production Pipeline from STN-N (KP0) to STN-S (KP6.55)"
1.0 INTRODUCTION
This Mathcad sheet has been written in order to calculate in-line and cross flow vortex induced vibration onset and screening lengths of pipelines in accorda DNV-RPF105 Free Spanning Pipelines 2006 (Reference [1]). The sheet calculates the following span limits: VIV onset Fatigue screening ULS criterion (according to Reference [2]) considering both static and dynamic loading On-bottom wave and current velocities are calculated using methodology contained within both Reference [1] and Reference [2]. The sheet is set up to perf an untrenched pipeline configuration. Screening data is always 1 year return period wave data, and 100 year return period current data. Onset lengths can be based upon 1, 10 or 100 year data depending upon the loadcase under consideration. ULS check should consider 100 year current for conditions, and 10 year for temporary conditions, it is a project decision whether maximum wave height and period should be used. Cyclonic conditions will evaluation of overall velocities and dissemination of these into suitable wave and current components. Sheet performs calculations for the length of the pipeline route of the above for the as-laid, flooded, hydrotest and operating loadcases. For VIV calculations, operating pressures and temperatures are used. Half of any corrosion allowance should be considered - Guidance Note in Section 2.2.5 Reference [1]. NOTE THAT THIS MAY VARY ON A PROJEC Corrosion not considered for calculation of effective axial force [and hence frequencies, onset and screening lengths] but is included for stress calculations Reference [1]. For ULS criterion check, corrosion allowance is conservatively EXCLUDED when calculating pipeline loading, but INCLUDED when considering pipeline ca For ULS criterion check, MAXIMUM wave height and associated period is considered for static loading. Dynamic loading uses SIGNIFICANT values. Des and pressures are used. Simplified soils damping criteria are used for this calculation It is currently assumed that functional loading does not reduced the combined loading effect, refer to Note 1 of Table 4-4 Reference [2]. Sheet is set up for single, non-interacting spans only - interacting spans require FE Analysis to determine natural frequencies. Sheet assumes pipe is fully restrained. If this is not the case, an effective axial force may require to be manually input for the operational loadcase.
References 1. Det Norske Veritas, DNV-RP-F105 - Free Spanning Pipelines, 2006. 2. Det Norske Veritas, DNV-OS-F101 - Submarine Pipeline Systems, 2012 3. Det Norske Veritas, DNV-RP-F109 - On-bottom Stability Design of Submarine Pipelines, 2007. 4. Det Norske Veritas, DNV-GL-14 - Free Spanning Pipelines, 1998. 5. Det Norske Veritas, DNV-RP-C205 - Environmental Conditions and Environmental Loads April 2010 Appendix 1: Free Span Span Analysis Analysis - 12inch Production Production Pipeline(As-Laid Pipeline(As-Laid Case)
APPENDIX 1 - FREE SPAN ANALYSIS - 12INCH 12INCH PRODUCTION PRODUCTION PIPE General Functions / Unit Definition
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col matrixcol 0 match ma max ma matrix
Sign up to vote on this title trim_rows trim_rows( matrix matrix max_row max_rows s) return submatrix matrix 0 max_rows 0 cols( matrix matrix) useful Useful Not max_fi max_find nd( matrix matrix col)
