Deep Down's patented Non-Helical Umbilical (NHU®) combines our experience manufacturing miles of loose steel tube flying leads, terminating conventional steel umbilicals, and observing installation behavior of all subsea umbilicals. The NHU can be manufactured in lengths up to 10 miles using super duplex tubes in standard sizes and in any configuration of hydraulic, electrical or optical elements. It is intended for long-term infield (static) or short-term dynamic service applications.
Multiple tubes are fed into the patented Deep Down NHU® manufacturing mechanism, bundled, then extruded with a HDPE outer jacket. Umbilicals are not torque balanced on their own, so rather than expending resources to balance and imparting stresses to helically wind them, the NHU® uses the imbalance to its advantage, resulting in a standard bundle.
The proprietary NHU® umbilical manufacturing concept is fully containerized, portable and easily transported for setup anywhere in the world. The ability to manufacture in close proximity to subsea fields offers the benefits of reduced lead times, the use of smaller installation vessels, use of compact Deep Down equipment, the incorporation of the appropriate percentages of local content, and more favorable economics.