Influence of Route Changes on Subsea Pipeline On-Bottom Roughness Analysis
摘要
In the present study, the importance of analyzing route data and its impact on pipeline on-bottom roughness (OBR) has been discussed. The presence of seabed features in the form of debris, pinnacles, boulders, depressions, spudcan depressions, and rig leg impressions can lead to wrong estimation of spanning of pipeline. Further detected sonar contacts along the route corridor have confirmed the debris/linear contacts. To avoid debris, undulations route has been modified to get new route and revised route length increases by 18.1 m. On-bottom roughness analysis has been performed considering the revised route, and the explicit FE program SAGE profile has been utilized for this purpose. The OBR analysis has been conducted for this pipeline with modified route, and acceptance with respect to DNV criteria has been assessed.