Abstract

The purpose of route roughness analysis is to give a guided idea about rectifying of the roughness seabed for installation contractor. The bottom roughness analysis is performed and considering the seabed profile to establish, the over spans locations along this segment pipeline route for installation condition, hydro test condition, operational condition and temporary over station transportation condition. The locations of the roughness of the seabed that need rectifying are determined and pipeline spans on rectified seabed are checked. The predicted number of spans and span height will be evaluated for the all conditions. Then the program will results in the pipeline the predicted free spans and span height. With the pipe-in-pipe model, the analysis result can be more in line with the actual situation.

INTRODUCTION

This article performs the bottom roughness of 12′/18′ subsea multiphase pipeline. The purpose of this analysis is to give a guided idea about rectifying of the roughness seabed for installation contractor. The bottom roughness analysis is performed and considering the seabed profile to establish, the over spans locations along this segment pipeline route for installation condition, hydro test condition, operational condition and temporary over station transportation condition. The locations of the roughness of the seabed that need rectifying are determined and pipeline spans on rectified seabed are checked.

The route on-bottom roughness analysis is carried out for the entire length of the pipeline using the finite element software "SAGE Profile 3.1". The on-bottom roughness analysis is performed considering the seabed profile of proposed pipeline route to establish the over spans' locations along the entire pipeline route for the various design conditions to give an idea about the unevenness of the seabed profile and the predicted over spans. The design conditions that are considered are installation, hydro test, operation and temporary over station . SAGE Profile is a finite element suite of programs for performing pipeline profile analysis. It is capable of performing analysis on nonlinear pipe bending, non-linear soil response (bearing capacity, axial and lateral friction resistance), and touch down and lift-off modeling in 3D configurations.

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