Numeric Simulation for a J-Lay Subsea Pipeline Launching System

Over the last decade deepwater pipe laying has gone through a spectacular development. In the early 90s a water depth of 300 meters was considered deep, while today depths of 2000 meters are common practice. The unprecedented global demand for oil and gas is the main drive in the offshore petroleum industry, which in turn demands improved pipeline technology. The installation of pipelines and flowlines constitutes some of the most challenging offshore operations handled. The required engineering sophistication, as well as the share size and complexity of the vessels used, has developed pipe laying into an engineering discipline of its own accord. Present trends in the market indicate an increase in deepwater projects as well in length and depth. In this paper, following the trend of involving the Finite Element Models and using Ansys 15 software advanced features, a J-Lay subsea pipe J-Lay launching system shall be approached, in order to determine the main stresses and strains inflicted by the upper structure of a launching system of a vessel over the pipe. The integrity of the subsea pipe during launching from a J-Lay vessel is the most important criteria to judge in a successful launching. In the J-Lay systems as the one presented in this paper the vessel launching structure is stressing the pipe sometimes beyond the elastic domain and the verification of the stresses inside the pipe is of a paramount importance. This paper is providing a modern involvement of Finite Element Methods in calculating stresses and strains during launching, being the basis for any optimization studies. The optimization of the launching geometry will be the object of another paper.


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  • Accession Number: 01606920
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Jul 28 2016 10:58PM