An arrangement and a method for installing a propulsion unit to a hull of a ship. The propulsion unit comprises an upper part of the propulsion unit attachable to the hull of the ship and a lower part of the propulsion unit where to a propeller shaft is rotatably supported, and the upper part of the propulsion unit having flanges to attach the flanges tightly to the hull, and wherein there is an aperture in bottom of hull where to the propulsion unit is to be installed. The arrangement comprises a plurality of watertight covers covering openings in the bottom of hull and a plurality of watertight covers covering openings in the top of the upper part of the propulsion unit, wherein the arrangement comprises a removable hull-side cover covering at least the opening under it, and at least one removable propulsion unit side cover covering the opening under it and facing the opening, and the removable covers are bolted from the hull-side.

A system assists the driving of a ship and is configured to estimate the structural loads of the ship due to the direct wave excitation, and structural loads of the ship due to the whipping effect caused by the wave slamming. The system includes at least one reference sensor adapted to provide an indication of a motion or stress magnitude at a predetermined point of the ship structure, and is further configured to calculate an estimate of the magnitude at the predetermined point in the ship structure, compare the indication of magnitude with the estimate of the magnitude so as to determine an offset value, and correct the estimates of the structural loads and/or the estimate of the magnitude on the basis of the offset value.

The present invention relates to a gantry tower crane for inspecting a cargo hold, comprising: two running rails which are installed to be spaced apart from each other in the longitudinal direction of the cargo hold; two prefabricated towers, each of which are installed to be able to move along respective running rails; and a basket which is installed to be able to move up and down along the prefabricated towers. Thus, as the basket installed in the prefabricated towers is installed to have a variable length and to be rotatable, it is possible to inspect both wall surfaces and a ceiling of the cargo hold, and to inspect the wall surfaces while moving along an overpass. Also, it is possible to obtain an effect of being able to perform inspection more precisely in a state where an operator comes closer to the wall surfaces by extending an auxiliary foothold of the overpass.

A sealing device for a vessel to achieve a fluid-tight seal in an aperture made in the lateral wall of said vessel, into which aperture a shaft is inserted. The sealing device comprises first sealing means disposed in contact with the shaft in the zone of said aperture, and second sealing means, comprising a containing body and a flexible connection element. The first sealing means comprise a plurality of sealing rings, disposed coaxial to the shaft and in contact with the latter, and a containing tube to contain the sealing rings. The lateral wall of the vessel comprises an interface flange. A closing flange is connected to the interface flange and to a flanged end of the containing body by means of attachment means and is positioned in contact with the containing tube and with the flexible connection element to keep the first sealing means in a determinate axial position with respect to the shaft.

A debris collection apparatus for a maritime vessel includes a shroud and a plurality of support structures. Each of the plurality support structures include a boot defining a cavity and configured to be secured to the vessel, a foot sized to fit within the cavity, a staff cap, a stabilizer base configured to be secured to the vessel, an elevational staff section connected to the foot and the staff cap terminal, and a horizontal staff section connected to the staff cap and the stabilizer base. The foot is inserted into the boot to secure the support structures in a rigid position, and the shroud is connected to both staff caps and the vessel. The stabilizer base can include a connection loop, and the shroud can be configured to be connected to the connection loop in order to connect the shroud to the vessel.

A wake test instrumentation and more particularly, systems and methods for determining wake velocities and directions are provided. The wake test instrument includes a linkage system mounted to a base and a pole pivotally mounted to the linkage system and which comprises a hydrofoil system. The wake test instrument further includes a hydrofoil system mounted to the pole. The wake test instrument further includes a water flow meter mounted to the pole which is structured to measure wake parameters.

An exemplary sensor device provides marine vessel data of a marine vessel without integration to the marine vessel's information systems. The sensor device includes a receiver configured to receive at least position and time information relating to the marine vessel. At least one sensor is configured to measure marine vessel performance data. The at least one sensor can measure the marine vessel performance data when the sensor device is affixed to the hull structure of the marine vessel. At least one processor is configured to perform frequency analysis of the measured marine vessel performance data and to generate marine vessel data based on the received at least position and time information and the frequency analyzed marine vessel performance data.

A collapsible boat hull (10) with at least one bottom panel (16,18) and two side panels (12,14), and a removable transom (32) with attachment means (36) to engage the transom with the two sides of the boat hull, such that, during installation of the transom member, the attachment means initially engages with the sides of the boat, and rotation of the transom to an upright position in the boat hull retains the attachment means and the respective sides of the boat hull together. Releasable latches (42,44) at the lower edge of the transom engage with retaining members (54) on the bottom panels. Seating or cross-bracing has (100) which releasably engage with retainers on the sides of the boat.

A sleeved pole-like cleaning device having a pole-like member with a head portion defining a working surface and a removably couplable sleeve with a distal end, a proximal end, a first layer being of a substantially deformably-resilient and polymer-based material, and a second layer coupled to the first layer. The removably couplable sleeve has a first position along a slideable path while the removably couplable sleeve is encapsulating the pole-like member with the distal end of the removably couplable sleeve not substantially adjacent to the head portion of the pole-like member and a second position along the slideable path while the removably couplable sleeve is encapsulating the pole-like member with the distal end of the removably couplable sleeve substantially adjacent to the head portion.

A ship breaking down arrangement (1) comprising,—two waterborne platforms (10, 20) having at least one removing means (60) for removing dismantled parts and/or fluids from a ship (40) which shall be broken;—a midsection (30) placed between and connected to said platforms lifting means provided on the platforms for lifting and lowering the ship between said platforms; and—at least one transporting means (90) for receiving and transporting said dismantled parts and/or fluids to a receiving location, wherein breaking down is performed while the ship is still located at sea. The application also relates to a method for breaking down ships.