Submersible transducer includes a transducer housing configured to be submerged within an aqueous liquid and a pressure sensor operable to obtain data for determining a pressure of the aqueous liquid. The pressure sensor may be disposed within the transducer housing. The submersible transducer also includes a submersible cable having an electrical conductor and a venting tube operably coupled to the pressure sensor. The pressure sensor uses an atmospheric pressure of an external environment that is detected through the venting tube to determine the pressure of the aqueous liquid. The submersible cable also includes a cable jacket and an inner layer that is surrounded by the cable jacket. The inner layer surrounds the electrical conductor and the venting tube. The inner layer includes a non-hygroscopic polymer that is more resistant to absorbing the aqueous liquid than the cable jacket.

A subsea umbilical comprising a plurality of longitudinal strength members, wherein at least one longitudinal strength member is a steel longitudinal strength member and has a semi-conductive coating. The invention can be used both in static, deepwater applications when substantial loading is to be applied to the umbilical, and in dynamic applications when the umbilical is too light and ballast is needed.

Submersible transducer includes a transducer housing configured to be submerged within an aqueous liquid and a pressure sensor operable to obtain data for determining a pressure of the aqueous liquid. The pressure sensor may be disposed within the transducer housing. The submersible transducer also includes a submersible cable having an electrical conductor and a venting tube operably coupled to the pressure sensor. The pressure sensor uses an atmospheric pressure of an external environment that is detected through the venting tube to determine the pressure of the aqueous liquid. The submersible cable also includes a cable jacket and an inner layer that is surrounded by the cable jacket. The inner layer surrounds the electrical conductor and the venting tube. The inner layer includes a non-hygroscopic polymer that is more resistant to absorbing the aqueous liquid than the cable jacket.

A production method for a headline sonar cable characterized by steps of: a. providing a first strength member (14); b. coupling to strength member (14) a conductor (122); c. forming a layer of polymeric material about the combination of strength member (14) and conductor (122) while ensuring that the conductor remains slack; d. forming a flow shield around the layer of polymeric material, thus forming an elongatable internally located conductive structure; and e. braiding a strength-member jacket layer (52) of polymeric material around the elongatable internally located conductive, structure while ensuring that the conductor is slack when surrounded by the jacket layer (52).
For another embodiment, an optical fibre is wrapped around the exterior of the layer of polymeric material within which is enclosed a braided conductor formed about the first strength member (14). Other embodiments employ further thermo-plastic layers and further sheaths and further conductors.

A dynamic submarine power cable having: a conductor, an insulation system including an inner semiconducting layer arranged around the conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer, a metallic water-blocking layer arranged around the insulation system, and a bedding layer arranged between the outer semiconducting layer and the metallic water-blocking layer, wherein the static friction coefficient between an outer surface of the bedding layer and the metallic water-blocking layer is at least 0.4, and the static friction coefficient between an inner surface of the bedding layer and the outer semiconducting layer is at least 0.4.

A production method for a headline sonar cable (20, 120) that exhibits a high breaking-strength and lighter weight than a conventional steel headline sonar cable. Producing the headline sonar cable (20, 120) is characterized by the steps of: a. providing an elongatable internally-located conductive structure (34, 134) that is adapted for data signal transmission; and b. braiding a strength-member jacket layer (52) of polymeric material around the structure (34, 134) while ensuring that the structure (34, 134) is slack when surrounded by the jacket layer (52). The structure (34, 134) of the cable (20, 120) retains conductivity upon stretching of the jacket layer (52) surrounding the structure (34, 134) that lengthens the cable (20, 120). For one embodiment of the method a conductor (20) wrapped around a rod (24) and enclosed within a sheath layer (32) forms the structure (34, 134). For another embodiment of the method a braided conductor (122) enclosed within a braided sheath (124) and a polymeric layer (132) forms the structure (34, 134).

A production method for a headline sonar cable characterized by steps of: a. providing a first strength member (14); b. coupling to strength member (14) a conductor (122); c. forming a layer of polymeric material about the combination of strength member (14) and conductor (122) while ensuring that the conductor remains slack; d. forming a flow shield around the layer of polymeric material, thus forming an elongatable internally located conductive structure; and e. braiding a strength-member jacket layer (52) of polymeric material around the elongatable internally located conductive, structure while ensuring that the conductor is slack when surrounded by the jacket layer (52). For another embodiment, an optical fibre is wrapped around the exterior of the layer of polymeric material within which is enclosed a braided conductor formed about the first strength member (14). Other embodiments employ further thermo-plastic layers and further sheaths and further conductors.

A dynamic submarine power cable for deep-sea applications, including: a conductor, an insulation system arranged around the conductor, the insulation system including an inner semiconducting layer arranged around the conductor, an insulation layer arranged around the inner semiconducting layer, and an outer semiconducting layer arranged around the insulation layer, a bedding layer arranged around the insulation system, and a longitudinally welded corrugated metallic water barrier arranged around the bedding layer, wherein the bedding layer fills the corrugations of the corrugated metallic water barrier, wherein the bedding layer includes a single layer which has an initial stiffness at onset of compressive stress to provide structural support against external hydrostatic pressure exerted on the metallic water barrier, and an increased elasticity as compared to the initial stiffness when the compressive stress has reached a stress threshold to absorb cyclic thermal expansion and contraction of the insulation layer, or wherein the bedding layer includes an outer layer and an inner layer, wherein the outer layer fills the corrugations and is stiffer than the inner layer and provides structural support against external hydrostatic pressure exerted on the corrugated metallic water barrier, the inner layer providing elasticity to absorb cyclic thermal expansion and contraction of the insulation layer.