VARYING RADIAL ORIENTATION OF A POWER CABLE ALONG THE LENGTH OF AN UMBILICAL

摘要

A power triad of an umbilical may be rotated during multiple transition lengths to position each power cable of the power triad equally at radial orientation over the length of the umbilical. A first portion of the umbilical includes the triad in a first radial orientation, a second portion of the umbilical includes the triad in a second radial orientation, and a third portion of the umbilical includes the triad in a third radial orientation. The triad is rotated a first one hundred twenty degrees from the first radial orientation to the second radial orientation during a first transition length. The triad is rotated a second one hundred twenty degrees from the second radial orientation to the third radial orientation during a second transition length. The use of three radial orientations along the length of the umbilical may reduce imbalances between the power cables of the triad.

主权项

1. A method for positioning a triad of a power cable of an umbilical, the method comprising:
positioning a first end of an umbilical at a first location, the umbilical comprising a first power triad within an exterior sheath of the umbilical, the first power triad comprising a first power cable, a second power cable, and a third power cable; extending a second end of the umbilical to a second location positioned a determined distance from the first location; positioning the first power triad at a first radial orientation at the first location, wherein the first power cable, second power cable, and third power cable are radially spaced around a center axis of the first power triad; selectively securing the first power triad at the first radial orientation from the first location to approximately one third of the determined distance; releasing the first power triad from the first orientation at approximately one third of the determined distance; rotating the first power triad to a second radial orientation around the center axis of the first power triad at approximately one third of the determined distance; selectively securing the first power triad in the second radial orientation from approximately one third of the determined distance to approximately two thirds of the determined distance; releasing the first power triad from the second radial orientation at approximately two thirds of the determined distance; rotating the first power triad to a third radial orientation around the center axis of the first power triad at approximately two thirds of the determined distance; and selectively securing the first power triad in the third radial orientation from approximately two thirds of the determined distance to the second location.