L3 Technologies
Marine Cable Installation

L3 MariPro has supplied a broad range of marine cable services for design engineering, route engineering, shore landings, platform riser systems, installation, inspection and repair to the offshore oil and gas, utilities, renewable energy and telecommunication industries for over 50 years. We have an extensive track record of installing and repairing a wide variety of power and fiber optic cable types. We offer a full range of cable installation and repair equipment to meet demanding installation parameters and because our cable installation equipment is modular, we can cost effectively perform projects at locations where it would otherwise be prohibitive to mobilize high-cost dedicated cable ships or lay barges. We also have a broad understanding of local, state, federal and international permitting mitigation requirements and international customs regulations.

For new construction projects our highly experienced engineering staff is able to assist our customers with the proper cable selection for their specific marine application, along with associated cable accessories and cable landings designs. For many companies, cable procurement is complex and confusing.

L3 MariPro has frequent dealings with many cable manufacturers and understand the products that each offer. We also understand that the purchase of cable is a considerable investment. For that reason L3 MariPro also offers cable quality assurance services to oversee the manufacturing and acceptance testing processes ensuring the quality of the product.

L3 MariPro also offers many cable accessories for a wide variety of cable types including subsea cable terminations, cable joints or splice boxes, various hang-off fixture designs and pressure housings. Some cable manufacturers have not developed, or do not offer complete cable repair kits for the cable that they manufacture; however, with our cable experience L3 MariPro is able to cost effectively supply certified splice kits for many cable types.

L3 MariPro is an industry leader in cable route engineering services. Conducting a detailed survey of the proposed marine cable route is paramount for enabling the route designer to fully understand the bathometry, currents, areas of hard-bottom habitat, sub-bottom soils stratum and location of debris. L3 MariPro operates MakaiPlanPro®and MakaiLay® marine cable installation software products which are recognized as state of the art by industry leaders. These unique software systems allow powerful tools to perform route engineering evaluation, precise desktop 3-D dynamic installation simulations and also integrate into the installation vessels Differential Global Positioning System (DGPS) navigation and cable handling systems.

MakaiPlanPro® helps minimize cable damage caused from improper route selection. Cable placement accuracy requirements within a permitted cable route of less than 75 meters, in depths of down to 5,000 meters, can be typical. The MakaiLay® navigation and installation system gives the Installation Director an understanding of the effects of various installation parameters including turns by the installation vessel, ocean currents acting upon the cable and cable tension; enabling adjustments in navigation to ensure accurate cable placement. The system also automatically accumulates diverse deployment records.

L3 MariPro has been responsible for installing 159 various cable landings at 82 worldwide locations utilizing a variety of technologies. Our experience includes, designing and installing deep water oil platform I-tube and J-tube riser systems, use of abandoned outfall and pipeline conduits, purpose built horizontal directionally drilled (HDD) conduits, as well as using standard trenched shore landing approaches with heavy armor split pipe. 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. HDD has become the leading shore landing of choice eliminating many environmental impact concerns.

We have installed over 300 marine cable strings totaling over 8,400 km of fiber-optic and power cables. Each marine cable installation is unique and requires detailed evaluation, design, permit mitigation, planning and procedures specific to the cable specification, water depth, cable landings, accuracy of placement, burial requirement and available floating equipment. Our experienced engineers validate that the correct marine cable deployment and floating equipment is utilized for each application, ensuring the installation process does not violate any cable specification parameters. Based on confirmed installation requirements we have extensive experience utilizing dedicated cable ships, Dynamic Positioning II (DPII) Offshore Supply Vessels (OSV), lay barges and a variety of utility and support vessels. We have installed cable both while live-boating DPII OSVs and cable ships and have utilized leap-frog anchored deployments from 4-point lay barges when necessary; depending on available floating equipment near the jobsite. Inherently, all of our operations typically include surface supplied diving and Remotely Operated Vehicle (ROV) support, and occasionally atmospheric diving intervention.

Cable installations in water depths shallower than 1,000 meters or in the Gulf of Mexico generally require burial to protect the cable from damage due to external aggression threats and fishing operations.
L3 MariPro has performed cable burial with direct burial plows, jet sleds, Post Lay Inspection and Burial (PLIB) ROVs and burial trenchers for near shore shallow water cable burial operations.

After installation, L3 MariPro continues to support our clients with detailed as-built final reports, ongoing system maintenance and system operation and the occasional cable repair when cable becomes damaged due to external aggression or cable manufacturing flaws. To date, we have performed 124 cable repairs on many cable types including fault location, cable recovery, supply of cable joints and splice boxes, testing and redeployment.