## Proceedings of the ... International Conference on Offshore Mechanics and Arctic Engineering, Volume 2American Society of Mechanical Engineers, 2001 - Arctic regions |

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Page 148

... the wave - induced current , and the opposing soil resistance force , which in

turn is a function of the

currents , the pipeline weight , wt , and the soil friction , with friction

... the wave - induced current , and the opposing soil resistance force , which in

turn is a function of the

**lift**force , Fi , arising from the wave - induced and steadycurrents , the pipeline weight , wt , and the soil friction , with friction

**coefficient**, f .Page 343

At present a full 3D FEA models are used for global stress analysis which is a

combination of sub - models of the heavy

sea fastening capacity is evaluated separately assuming a small friction

At present a full 3D FEA models are used for global stress analysis which is a

combination of sub - models of the heavy

**lift**vessel , the ... For these reasons thesea fastening capacity is evaluated separately assuming a small friction

**coefficient**.Page 376

The hydrodynamic module calculates drag - and

instantaneous relative position between the risers An efficient model for ... The

load model accounts for these effects in terms of pre - defined coefficient tables .

The hydrodynamic module calculates drag - and

**lift coefficients**based on theinstantaneous relative position between the risers An efficient model for ... The

load model accounts for these effects in terms of pre - defined coefficient tables .

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acceptable analysis applied approach assessment associated assumed calculated coefficient combined components considered corresponding corrosion cost crack criteria damage defined dependent depth determined developed direction distribution dynamic effect element Engineering environmental equation estimate evaluated event example expressed extreme factor failure fatigue Figure force frequency function fuzzy given important increase initial inspection International limit load loss maintenance maximum mean measured Mechanics method motion normal obtained offshore operational parameters peak performed period pipe pipeline platform possible predicted present probability probability of failure procedure production random range relative reliability represents response return period riser risk safety ship shown shows simulation spectral spectrum statistical storm strength stress structure surface Table theory typical ultimate uncertainties variables wave height wind