EFFECT OF HYDRODYNAMIC FORCES ON OFFSHORE PIPELINES

The pipelines can be subjected to the combined effect of steady currents, oscillatory currents, and wave-induced forces while resting on the seabed. The parameters of pipeline should becarefully evaluated and selected to ensure maximum stability. To study the stability of pipeline due to acting these forces a modeling diagram of these forces acting on the pipe cross section is presented. The parameters as well as, practical and effective velocity havebeen studded to showing the effect of hydrodynamic forces on pipelines with various water depths. These forces are friction resistance force, combined drag force, combined lift force,inertia force and submerged weight of the pipe. Estimation of the submerged weight and theforces acting on the pipeline was performed at different water depths to facilitate of pipeline design parameters with respect to the on-bottom stability. A computer program written in BASIC language has been used in this work.

Keywords:

Offshore pipelines , Stability , Hydrodynamic Forces , Water depths