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DNV GL DNV-RP-F105 Free Spanning Pipelines

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Det Norske Veritas - Germanischer Lloyd

Free Spanning Pipelines
 N DNV-RP-F105

 

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Scope and application

Detailed design criteria are specified for Ultimate Limit State (ULS) and Fatigue Limit State (FLS) due to in-line and cross-flow Vortex Induced Vibrations (VIV) and direct wave loading.

The following topics are considered:

— methodologies for free span analysis

— requirements for structural modelling

— geotechnical conditions

— environmental conditions and loads

— requirements for fatigue analysi

— VIV response and direct wave force analysis models

— acceptance criteria.

Free spans can be caused by:

— seabed unevenness

— change of seabed topology (e.g. scouring, sand waves)

— artificial supports/rock beams etc.

— strudel scours.

The following environmental flow conditions are described in this document:

— steady flow due to current

— oscillatory flow due to waves

— combined flow due to current and waves.

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