Configuration of Submarine Pipeline for Deepwater S-lay Technique

摘要

The safety of submarine pipeline has become an important problemrnduring installation in deep water due to the combined action of highrnexternal water pressure, axial tension and bending moment. The specialrnstudies are focused on the deepwater S-lay technique in the presentrnpaper. The stiffened catenary theory is applied to establish the staticrnequilibrium governing differential equation of a pipe element, and thernsolution equations of total configuration of the pipeline from a laybargernover a stinger to the seabed are completely derived. Thernnumerical iteration method for solving pipeline configuration isrnpresented in detail, and the corresponding program is developed byrnauthors to carry out the analysis of effects of various parameters such asrnwater depth, pipe diameter, thickness of concrete weighted coatingrnlayer, stinger length and control strain on pipe-laying configuration.rnThe results show that as the inclination angle at the lower end of stingerrnis larger or smaller, the effects of these parameters on the configurationrnof pipeline are different; however, the thickness of concrete weightedrncoating layer has little effect on the configuration.