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Loose Steel Tube Flying Leads (LSFL)


Deep Down is a leader in flying lead design, manufacture and installation; in particular steel tube flying leads. Our flagship product, the LSFL® (Loose Steel Tube Flying Lead), was developed to eliminate the residual memory left in traditional flying leads due to the bundling process. The loose lay of the tubes significantly reduces stiffness of the assembly, allows the bundle to lay flat on the sea floor, follow the prescribed lay path precisely, bend in a tight radius with minimal resistance and offer maximum compliance for easy makeup in lengths up to 1,000’. When greater lengths up to 10,000’ are required, we utilize our patented NHU® (Non-Helical Umbilical) in conjunction with a complaint section on each end of the assembly to achieve the same result. We also offer hybrid LSFL® assemblies which can include any number and combination of electrical, optical, hose and steel tube elements. Hybrid LSFL® technology provides installation savings in both time and money as fewer operations are required to install the combined unit.

Deep Down employs the patented Moray® termination system on each end of the LSFL®. The Moray® termination is a light weight, high-strength, configurable and field serviceable framework used to connect any commercially available MQC (Multi-Quick Connect) plate to the LSFL® bundle. The Moray® termination assembly allows the installation load from the steel tubes or strength member to be transmitted directly to the framework and through to the installation rigging while isolating couplers from the load to maintain maximum compliance. The Moray® termination with compliant section is ideal for umbilical end terminations, it eliminates the need for bulky armor pots and is more manageable than a traditional umbilical end termination. In this application, the Moray® termination can be used to house multiple electrical, optical and auxiliary hydraulic interfaces in integrated ROV panels. Moray® termination assemblies can be outfitted with integrated buoyancy allowing quicker installation times by eliminating the need to recover buoyancy modules. Additionally, this allows for the use of a smaller class ROV on a vessel of opportunity should the need for rework arise.

Deep Down has been involved in the umbilical flying leads industry since its inception and has pioneered the development of the LSFL through cooperation with operators and industry partners. Deep Down has supplied LSFL based flying leads for over a decade without a failure.