Concept verification optimization wp6 preliminary model test results
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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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Concept verification optimization wp6 preliminary model test results

Concept Verification & OptimizationWP6 - Preliminary Model Test Results

Hans Cozijn - MARIN


Presentation outline

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


  • Conclusions short

    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


    Scale models

    Scale Models

    • Scale 1:60

    • Dome with mooring lines

    • Riser tube

    • Buffer bell

    • DP Shuttle tanker with Offloading Hose


    Riser tube

    Riser Tube


    Dome with mooring lines and tanker wreck

    Dome with Mooring Lines and Tanker Wreck


    Detail of dome mooring lines

    Detail of Dome Mooring Lines


    Detail of anchor point

    Detail of Anchor Point


    Dp shuttle tanker model 1

    DP Shuttle Tanker model (1)


    Dp shuttle tanker model 2

    DP Shuttle Tanker model (2)


    Applied instrumentation

    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)


    Difis system in test set up

    DIFIS System in Test Set-up


    Buffer bell in test set up

    Buffer Bell in Test Set-up


    Test scope 1

    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)


    Test scope 2

    Test Scope (2)

    • Offloading tests

      • Operational environments (4)

      • Buffer Bell (1,000 t)

      • Shuttle Ballast / Loaded

      • Total 8 tests


    Model test results difis system alone

    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


    Model test results difis system alone1

    Model Test Results - DIFIS System Alone

    = Results of the Motion Decay Tests =

    Test No. 901009 - 1,000t Buffer Bell, Surge Decay


    Model test results difis system alone2

    Model Test Results - DIFIS System Alone

    = Results of the Motion Decay Tests =

    Test No. 902015 - 2,000t Buffer Bell, Heave Decay


    Model test results difis system alone3

    Model Test Results - DIFIS System Alone

    = Results of the Motion Decay Tests =


    Model test results difis system alone4

    Model Test Results - DIFIS System Alone

    = Results of Tests in Current=


    Model test results difis system alone5

    Model Test Results - DIFIS System Alone

    UR ~ 20

    (1,000 t)

    UR ~ 12

    (2,000 t)

    = Results of Tests in Current (no waves) =


    Model test results difis system alone6

    Model Test Results - DIFIS System Alone

    = Results of Tests in Current (no waves) =


    Model test results difis system alone7

    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 =


    Model test results difis system alone8

    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 =


    Model test results difis system alone9

    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 =


    Model test results dp shuttle difis system

    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


    Model test results dp shuttle difis system1

    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 =


    Conclusions and recommendations

    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


    Thank you questions

    Thank you.Questions ??


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