An active towed sonar comprises an emission antenna integrated into a submersible object called a towfish, a submersible receive antenna called a streamer and a tow cable to tow the towfish and the streamer. The tow cable comprises a termination connected mechanically and electrically to the streamer. The termination comprises means of removable mechanical and electrical connection of the towfish to the tow cable, independently of the connection of the streamer.

Apparatus and techniques are disclosed relating to towing marine equipment. In some embodiments, a vessel tows equipment through a body of water using a towing member with an associated fairing that includes a slit, such that an axis of the slit is non-perpendicular to a portion of the towing member from which the fairing extends.

Apparatus and techniques are disclosed relating to towing marine equipment. In some embodiments, a vessel tows equipment through a body of water using a towing member with an associated fairing that includes a slit, such that an axis of the slit is non-perpendicular to a portion of the towing member from which the fairing extends.

A fairing device and method for the reduction of vortex-induced vibrations or motions, the minimization of drag about a substantially cylindrical element immersed in a fluid medium, comprising; a fairing rotatably mounted about the cylindrical element, the fairing comprising a shell with a mainly cylindrical cross-sectional shape with an outer diameter (D) following the outer diameter of the cylindrical element from an upward stagnation point of 0 degrees to at least +/90 degrees, and which at +/90 degrees continues as two fin-like portions in an aft direction, further comprising that the fin-like portions are convexly curved aft of +/90 degrees thus tapering towards each other and defining a tail end opening or gap less than the fairing standoff height. A method for mounting, storage, and deployment of the fairing device is also disclosed.

A fairing device and method for the reduction of vortex-induced vibrations or motions, the minimization of drag about a substantially cylindrical element immersed in a fluid medium, comprising; a fairing rotatably mounted about the cylindrical element, the fairing comprising a shell with a mainly cylindrical cross-sectional shape with an outer diameter (D) following the outer diameter of the cylindrical element from an upward stagnation point of 0 degrees to at least 90 degrees, and which at 90 degrees continues as two fin-like portions in an aft direction, further comprising that the fin-like portions are convexly curved aft of 90 degrees thus tapering towards each other and defining a tail end opening or gap less than the fairing standoff height. A method for mounting, storage, and deployment of the fairing device is also disclosed.

A fairing device for the reduction of vortex-induced vibrations or motions, and for minimizing the drag about a substantially cylindrical element immersed in a fluid medium, comprising; a fairing rotatably mounted about the cylindrical element, the fairing comprising a shell with a mainly cylindrical cross-sectional shape with an outer diameter (D) following the outer diameter of the cylindrical element from an upward stagnation point of 0 degrees to at least +/90 degrees, and which at +/90 degrees continues as two fin-like portions in an aft direction, whereby the fin-like portions are convexly curved aft of +/90 degrees thus tapering towards each other and are defining a tail end opening or gap less than the fairing standoff height. A method for mounting, storage, and deployment of the fairing device is also disclosed.

An active towed sonar comprises an emission antenna integrated into a submersible object called a towfish, a submersible receive antenna called a streamer and a tow cable to tow the towfish and the streamer. The tow cable comprises a termination connected mechanically and electrically to the streamer. The termination comprises means of removable mechanical and electrical connection of the towfish to the tow cable, independently of the connection of the streamer.

A marine deflector handling system includes a seismic survey vessel with a deflector towing sheave with a towing line to a seismic deflector bridle block. The bridle block includes, as counted from its outer end to its inner end: two triple head arms with each its triple head in their outer ends for fore and aft sets of bridle lines to a deflector, wherein said triple head arms in their inner ends are coupled together in a hinge bearing block which further holds an outer end of a grip adapter stem, wherein said grip adapter stem in its opposite, inner end is provided with a grip adapter axle block with a transverse through extending and protruding grip adapter axle arranged for being gripped by a crane jaw, wherein said grip adapter axle further holds an outer end of a sheave block stem with an inner end provided with a sheave block for said towing line.

A variable rigidity tow cable for attaching a first vehicle with a second vehicle. The tow cable includes a tension control cable having a first end and a second end. Tension on at least one of the ends of the tension control cable can be controlled to increase or decrease the length of the tension control cable. A plurality of beads are slidingly disposed on the tension control cable between the first end and the second end. The beads are free to move relative to one another on the tension control cable when the tension control cable is slack, and the beads are engaged with each other to form a rigid structure around the tension control cable when tension is applied to the tension control cable.

A vortex-induced vibration (VIV) suppression device including a fairing comprising a fairing body having a nose dimensioned to partially encircle an underlying tubular and a first arm and a second arm extending from the nose, wherein the nose, the first arm and the second arm are one integrally formed unit and the first arm and the second arm are spaced a distance from one another along their entire length so as to define a gap therebetween; and a securing element dimensioned to fit within the gap between the first arm and the second arm and secure the fairing to an underlying tubular. Methods for securing a U-shaped fairing to a tubular and manufacturing a U-shaped fairing are also disclosed.