System and system elements for direct electrical heating of subsea pipelines

摘要

A device for high efficiency induction heating or direct electrical heating, DEH, of a number, M, Mε[1, N of a group of parallel subsea pipelines N, where Nε[2, ∞, and where a number of conductor cables, W, supplies electrical power from at least one top side power supply to M of the parallel subsea pipelines N, wherein the number of electric conductors, W, from the at least one top side power supply connected to the M pipelines is defined to be in the group Wε[N, N+1], where N, W and M are natural numbers.

主权项

1. A device for high efficiency induction heating or direct electrical heating, of a plurality, M, of pipelines, where Mε[1, N of a group of parallel subsea pipelines N arranged adjacent to each other, where Nε[2, ∞, and where a number of conductor cables, W, supplies electrical power from at least one top side power supply to M of the parallel subsea pipelines N, wherein the numbers of electric conductors, W, from the at least one top side power supply connected to the M pipelines is defined to be in the group Wε[N, N+1], where N, W and M are natural numbers, and wherein a second power supply G2 is provided to supply current in a reduction transfer current cable routed in parallel to the heated pipeline(s) M at a distance, d, the current through the reduction transfer current cable is adjusted to equal the absolute value of a steady state current in seawater, thereby reducing current transfer through CTZ.