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. An umbilical that extends from a first location to a second location, the umbilical comprising:
an exterior sheath that extends from a first end of the umbilical at the first location to a second end of the umbilical at the second location; a first power triad having a center axis positioned within the exterior sheath, the first power triad extends from the first end of the umbilical to the second end of the umbilical, the first power triad is adapted to selectively rotate about the center axis; a first power cable positioned within the first power triad, the first power cable extends from the first end of the umbilical to the second end of the umbilical; a second power cable positioned within the first power triad, the second power cable extends from the first end of the umbilical to the second end of the umbilical; a third power cable positioned within the first power triad, the third power cable extends from the first end of the umbilical to the second end of the umbilical; wherein the first power triad is locked in a first radial orientation along a length of a first portion of the umbilical, is locked in a second radial orientation along a length of a second portion of the umbilical, and is locked in a third radial orientation along a length of a third portion of the umbilical.