Published: 2014-12-09
ISBN: 978-91-7519-376-2
ISSN: 1650-3686 (print), 1650-3740 (online)
Direct electrical heating (DEH) is a technology for preventing hydrate formation and wax deposit inside oil and gas pipelines. Nexans Norway AS is researching and developing deep-water DEH solutions. The company has already produced a deep-water DEH piggyback cable that can carry its own weight at 1 070 m water depth. When this DEH system is installed outside the coast of Africa, it will be the world’s deepest DEH system. This paper derives axisymmetric cross section analysis calculations. The calculations are then applied to the deep-water DEH piggyback cable and compared to finite element method (FEM) simulations of the same cable. There are very good agreements between the analytical calculations and the FEM simulations. For three of five analysis results the differences are 0.6% or less. The largest difference is 4.2%, while the average difference (absolute values) is 1.8%.
Axial Stiffness; Axisymmetric Analysis; Cross Section Analysis; DEH; Direct Electrical Heating; Offshore Technology; Subsea Cable; Torsion Stiffness
