L3 Technologies
Cable Landings

L3 MariPro has been responsible for landing of cable systems using a variety of technologies. These range from standard trenched approaches with heavy armor or split-pipe to innovative use of drill-pipe or existing oil or gas lines, and horizontal directional drilling.

Cable Crossings
L3 MariPro developed the procedures and performed 123 cable crossings of pipelines and cables during the installation of 850 kilometers of fiber optic telecommunication cables linking 7 oil platforms in the Gulf of Mexico. In order to protect and separate the cables from the pipelines, a very high density polyurethane segmented covering was applied to the fiber optic cables as they were deployed over the pipelines. L3 MariPro has also successfully performed both cable and pipeline crossings for numerous other customers at worldwide locations.

Shore Landings
L3 MariPro pioneered the application of split-pipe on the system cable aboard the installation vessel while deploying cable and floating it to shore. This methodology precludes the need for a near-shore joint or splice; decreasing installation time, risk and cost. L3 MariPro has also successfully utilized reconditioned oil drill-pipe assembled on shipboard or shore side and pulled or floated into position for a number of installations. Further, L3 MariPro has installed cables in abandoned gas pipelines. On the first such project 16 km of cable was successfully installed in two different pipelines (8 km per pipe).

Shorelanding split-pipe
Chile, 2003
Shore landing split-pipe
Indian Ocean, 2000

Shore landing directional drilling
Wake, 2007

Horizontal Directional Drilling
Horizontal Directional Drilling (HDD), or directional boring, provides a trenchless method of installing conduits from shore to off-shore. The system cable is then pulled through the conduit to shore for connection to the system's on-shore equipment. HDD is used when trenching or excavation is not practical or environmentally desirable. HDD is often the preferred method for landing submarine cables onto shore.

L3 MariPro often works with our customers and qualified HDD suppliers to oversee the shore landing process to insure overall marine installation and project success of the cabled undersea sensor system.

Example of HDD in progress Example of HDD in progress


Offshore Platform Cable J-Tube & I-Tube Risers
L3 MariPro has experience in offshore platform cable landings in water depths from 60 to 300 meters. L3 MariPro has developed a unique offshore platform cable landing procedure that conforms to API standards utilizing standard platform cable landing hardware such as riser clamps and J-Tube or I-Tube cable riser systems combined with novel underwater cable storage bins and shipboard deployment rigging. L3 MariPro has completed the installation of nine J-Tube or I-Tube risers for both power and fiber optic cables on nine separate oil field platform structures. As on previous similar programs L3 MariPro also designed and manufactured the I tubes and clamps in addition to performing cable installation, including pull-in and testing.

Tube Construction and installation of Platform Landing



Design and Fabrication Straight Four Cable J Tube Section

Lower Trumpet Section