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Concept Verification & Optimization WP6 - Preliminary Model Test Results

Concept Verification & Optimization WP6 - Preliminary Model Test Results. Hans Cozijn - MARIN. Presentation Outline. Conclusions (short) Scale Models and Instrumentation Test Set-up Test Scope Model Test Results DIFIS System Alone (operational / survival)

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Concept Verification & Optimization WP6 - Preliminary Model Test Results

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  1. Concept Verification & OptimizationWP6 - Preliminary Model Test Results Hans Cozijn - MARIN

  2. Presentation Outline • Conclusions (short) • Scale Models and Instrumentation • Test Set-up • Test Scope • Model Test Results • DIFIS System Alone (operational / survival) • DIFIS System and DP Shuttle Tanker (operational) • Conclusions and Recommendations

  3. Conclusions (short) • Concept appears to be feasible • No un-expected or instable behaviour observed • Limited motions of Buffer Bell(even in survival conditions) • Load variations in the Dome mooring linesare larger than expected • Dome shape is hardly affected by current • DP Shuttle Tanker does not affect DIFIS system

  4. Scale Models • Scale 1:60 • Dome with mooring lines • Riser tube • Buffer bell • DP Shuttle tanker with Offloading Hose

  5. Riser Tube

  6. Dome with Mooring Lines and Tanker Wreck

  7. Detail of Dome Mooring Lines

  8. Detail of Anchor Point

  9. DP Shuttle Tanker model (1)

  10. DP Shuttle Tanker model (2)

  11. Applied Instrumentation • Motions (contactless optical system) • Accelerations (piezo-type, 3 components) • Line tensions (strain gauge transducers) • Current velocity (EMS) • Wave height (resistance wire) • Wind Velocity (propeller type anemometer) • Video recordings (above / under water) • Photographs (above / under water)

  12. DIFIS System in Test Set-up

  13. Buffer Bell in Test Set-up

  14. Test Scope (1) • DIFIS System Alone • Current Only conditions (4) • Operational environments (4) • Survival environments (4) • Buffer Bell (1,000 / 2,000 t) • Total 24 tests • 3 additional current only tests(1,000 t Buffer Bell only)

  15. Test Scope (2) • Offloading tests • Operational environments (4) • Buffer Bell (1,000 t) • Shuttle Ballast / Loaded • Total 8 tests

  16. Model Test Results - DIFIS System Alone • Plotted time traces / statistical analysis • Buffer bell displacements • Riser tube axial loads • Mooring line tensions • Contour plots showing system motions • Motion RAOs • Photographs, video recordings

  17. Model Test Results - DIFIS System Alone = Results of the Motion Decay Tests = Test No. 901009 - 1,000t Buffer Bell, Surge Decay

  18. Model Test Results - DIFIS System Alone = Results of the Motion Decay Tests = Test No. 902015 - 2,000t Buffer Bell, Heave Decay

  19. Model Test Results - DIFIS System Alone = Results of the Motion Decay Tests =

  20. Model Test Results - DIFIS System Alone = Results of Tests in Current=

  21. Model Test Results - DIFIS System Alone UR ~ 20 (1,000 t) UR ~ 12 (2,000 t) = Results of Tests in Current (no waves) =

  22. Model Test Results - DIFIS System Alone = Results of Tests in Current (no waves) =

  23. Model Test Results - DIFIS System Alone Test No. 905002 - Survival 3 Conditions (1,000 t) Test No. 907008 - Operational 1 Conditions (2,000 t) = Example Top-view XY Contour Plots =

  24. Model Test Results - DIFIS System Alone Test No. 905002 - Survival 3 Conditions (1,000 t) Test No. 907008 - Operational 1 Conditions (2,000 t) = Example Side-view XZ Contour Plots =

  25. Model Test Results - DIFIS System Alone Test No. 905002 - Survival 3 Conditions (1,000 t) Test No. 907008 - Operational 1 Conditions (2,000 t) = Example Front-view YZ Contour Plots =

  26. Model Test Results - DP Shuttle + DIFIS System • Plotted time traces / statistical analysis • Buffer bell displacements • Riser tube axial loads • Mooring line tensions • Shuttle tanker motions • Export riser loads • Contour plots showing system motions • Motion RAOs • Photographs, video recordings

  27. Model Test Results - DP Shuttle + DIFIS System Test No. 809005 Operational 3 Conditions Loaded Shuttle Tanker Buffer Bell 1,000 t = Example Top-view XY Contour Plots =

  28. Conclusions and Recommendations • Overall behaviour of DIFIS system meets expectations • No unexpected or instable behaviour observed • Dome shape remains intact in current • Variations in Dome mooring line loads (in waves)need to be addressed in the final design • Presence of DP Shuttle Tanker during offloadingdoes not affect the Buffer Bell / Riser Tube • Extrapolation of results to 4,000 m water depth

  29. Thank you.Questions ??

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