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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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Presentation Transcript
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
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