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Assessment Levels • Freespan Assessment
1
Level 1
VIV Screening
Level 2
VIV Fatigue Analysis (FLS)
Level 3
VIV Fatigue Analysis (FLS) FEA
Stress Analysis (ULS)
Stress Analysis (ULS) FEA
WGIM Company Confidential
24/06/2010
Level 1 Actual single span length (from survey)
Static allowable span length from design
Level 1 Span & touch down length and seabed type (survey)
Lactual
Lallow Interactivity Assessment
Level 2
Lactual < Lallow
Lallow
Lactual
Pipe / Environmental Input Data
Yes
VIV allowable span length criteria [Ref. 2]
Yes Lactual < Lallow
Calculate fatigue life using DNV FatFree Fatigue Life (tf)
No
Exposure Time (te)
No
Level 3 Pipe / Environmental and Profile Input Data
te < tf
Level 3
BMallow
Pipe / Environmental and Profile Input Data
Pipeline In-Place FE Analysis (ABAQUS) Yes BMactual
Yes
BMactual < BMallow
Exposure Time (te) Pipeline In-Place FE Analysis (ABAQUS)
Use natural frequency to calculate fatigue life in FatFree
No
No
Fatigue Life (tf)
No
te < tf
Yes
Yes
Span Requires Rectification Review history and consider rectification for spans that are not expected to “self-rectify” due to seabed movement.
Span does not require Rectification
Span Requires Rectification Review history and consider rectification for spans that are not expected to “self-rectify” due to seabed movement.
