Submarine Cable Design
Two basic designs are used: loose tube or slotted core. The loose tube design is based on fibers protected in a hermetical stainless steel tube. The slotted core design incorporates fibers arranged in ribbons. The slotted core is protected in a copper tube.
A polyethylene sheath and one or two layers of steel wire armoring is used to provide high tensile strength and good mechanical protection. The cables are armored depending on where they are going to be installed. Double armored (DA) cables are installed in shallow water with depths of 0 to 500 m.
Most commonly the DA cables are installed no deeper than 200 m. For depths greater than 500 m single armored (SA) cable is used and for depths greater than 1000 m lightweight protected (LWP) cable is used. An outer wrapping, normally made of high tensile polypropylene yarn is wrapped around the armoring to facilitate the handling of the cable during installation.
The product range comprises of cables and joints for depths down to 5000 m. The loose tube cables are designed for both Universal Joint (UJ) and Universal Quick Joint (UQJ) qualification and are offered with or without electroding capabilities. Electroding allows the cable to be detected and tracked in case it has been broken or moved on the seabed, or to verify burial depth.