Mohamed F. Shehada
A Finite Element Model for Subsea Pipeline Stability and Free Span Screening
An approach for the screening of subsea pipelines against on bottom lateral instability and free spanning is presented in this paper. The approach is based on the use of a nonlinear finite element model. Combined stresses/lateral displacement acting on offshore pipelines due to combined hydrodynamic loads including wave/current effects are computed using the finite
element model for both on bottom stability and free
spans. Results are compared with those obtained
from pipeline design codes. A case study is presented
for an actual pipeline off the shore of Saudi Arabia.
Results show that computed stresses/lateral displacements are within the specified code values.
The proposed approach can be a valuable tool for the
pipeline designer/operator for assessment of pipeline
stability and free spans.|