... behaviour, i.e. buckling load, length, amplitude and distance between adjacent but independent pipe deformations, are presented. friction coefficient deformation prediction vertical displacement analytical approach equivalent coefficient offshore pipeline upstream oil & gas tommeliten...

..., May 1990 8 Guijt, J , "Research on Upheaval Buckling of Offshore Pipelines", OPT Paris 1990 Table 1 Stress-strain parameters for API 5L materials Material ay 011 eu N (N/mm2) (N/mm2) B 241 413 0270 790 X42 289 413 0270 1209 X46 316 433 0260 1370 X52 358 454 0230 1825 X60 413 516 0225 1938 X65 448 551...

... ABSTRACT Interaction of dragging anchors with offshore pipelines is one of the most serious accidents the pipeline may experience. In case the risk of a rupture with leakage is considered not acceptable, a trench and a cover so deep and protective to reduce significantly the risk...

.... Keywords: Pipeline, Pree Span, Boundary Conditions, Soil-Pipe (Pipe-Soil) 1. INTRODUCTION Soil-Pipe Interaction under Oscillating Loads, is a key topic of free span assessment for submarine pipelines exposed to hydrodynamic loads. The hazard for offshore pipelines may be significant where either irregular...

... stiffness of restraints could be adjusted, to simulate different pipe-soil interactions at the free-span shoulders. static condition application gap ratio modal plane onset frequency displacement houston offshore pipeline rotation plane vortex axis oscillation amplitude artificial...

... wave force wavelength keulegan-carpenter number coefficient marine pipeline undertow reservoir characterization force sleeve experiment cylinder diameter irregular wave diameter force model positive upward wave height buoyancy regular wave test cylinder trough offshore pipeline...