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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

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








    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)




    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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