435 results about "Marine structure" patented technology

The present invention relates to a high-performance fire-resistant weather-resisting building steel and its production method. Said invention steel contains C, Si, Mn, P, S, Mo, Ti, Al, N, O, Cr, Ni, Cu, Ca, B and one or more than one kind of Nb, V and RE and the rest is Fe. After having been undergone the processes of smelting, rolling and heat treatment, said building steel possesses high strenght, high toughness and excellent fire-resisting and weather-resisting properties. The building steel can be used for providing various steel structural members whose thickness is 4-100 mm in the fields of building, civil engineering and marine structure. Under the large linear energy (50-100 kJ / cm) welding condition of gas-arc welding, electroslag welding and high-frequency resistance welding, its heat affected zone (HAZ) still possesses excellent toughness so as to greatly raise welding efficiency of engineering structure and reduce its manufacture cost.

Disclosed are marine coating compositions that are useful to inhibit the fouling of a marine structure by a broad spectrum of organisms. Generally, the marine coating composition comprises an antifouling agent and an organic vehicle.

A method and apparatus for deployment of mooring systems for buoyant marine structure such as mobile offshore drilling units (MODU's) and for connecting the same to the mooring lines thereof. An anchor handling vessel carries one or more anchors each having a deployment connection and a mooring connection and individually moves each anchor over its stern roller and deploys it to the sea bottom for installation. A handling line is disconnected by ROV from the deployment connection and is moved from the deployment connection to the mooring connection so as to become the main mooring line. Syntactic buoys are then mounted on the main mooring line for elevating it above the sea bottom for recovery. When MODU stationing is desired the anchor handling vessel then recovers the surface buoy and connects to the rig mooring line using a short section of mooring chain. A J-chaser stopper device is then installed in the mooring string and is connected to the mooring line of the MODU by a short section of chain. The J-chaser lowers the mooring string, completing the mooring connection between the anchor and the MODU. A plurality of mooring strings, typically eight, are deployed in this manner to properly station the MODU. Disconnection of the MODU is accomplished essentially by the reverse of the above deployment procedure.

A system for monitoring a physical change of a marine structure includes a complex optical measuring instrument configured to detect a behavior and structural change of the marine structure by using at least one optical sensor by means of optical fiber Bragg grating.

The invention is designed for providing a motion and resistance testing device for ship and marine structures, which comprises surge-motion sliding rails, sway-motion sliding rails, a heaving rod, a longitudinal motion block and transverse motion blocks, wherein the longitudinal motion block is arranged on the surge-motion sliding rail, the transverse motion blocks are arranged on the sway-motion sliding rails, the numbers of the surge-motion sliding rails, the sway-motion sliding rails and the transverse motion blocks are respectively two, the two surge-motion sliding rails are arranged in an up-and-down mode between the two transverse motion blocks, the two sway-motion sliding rails constitute a quadrilateral structure by two rods, the heaving rod is arranged on the longitudinal motion block, an end point of the heaving rod is located at the center of gravity of a tested marine structure and connected with the tested marine structure, and the heaving rod is provided with a line displacement sensor. The device disclosed by the invention can simultaneously measure the six-DOF (degrees of freedom) coupled motions such as rolling, pitching, yawing, heaving, surging and swaying of ship and marine structures in waves and the resistances of ship and marine structures in waves.

A method and apparatus for deployment of mooring systems for buoyant marine structures such as mobile offshore drilling units (MODU's) and for connecting the same to the mooring lines thereof. An anchor handling vessel carries one or more anchors each having a deployment connection and a mooring connection and individually moves each anchor over its stem roller and deploys it to the sea bottom for installation. A handling line is disconnected by ROV from the deployment connection and is moved from the deployment connection to the mooring connection so as to become the main mooring line. Syntactic buoys are then mounted on the main mooring line for elevating it above the sea bottom for recovery. When MODU stationing is desired the anchor handling vessel then recovers the surface buoy and connects to the rig mooring line using a short section of mooring chain. A J-chaser stopper device is then installed in the mooring string and is connected to the mooring line of the MODU by a short section of chain. The J-chaser lowers the mooring string, completing the mooring connection between the anchor and the MODU. A plurality of mooring strings, typically eight, are deployed in this manner to properly station the MODU. Disconnection of the MODU is accomplished essentially by the reverse of the above deployment procedure.

An electromagnetic active control device for longitudinal vibration of a marine shafting, belonging to the technical field of oceanographic engineering, comprises: an acceleration transducer, a tachometer, a signal analysis and control module, a power amplifier and an electromagnetic actuator, wherein the acceleration transducer and the tachometer are respectively located on a thrust bearing base and a middle shaft and output a measured vibration acceleration electric signal of the base and a photoelectric signal of the shafting to the signal analysis and control module; the signal analysis and control module receives the vibration acceleration electric signal and the photoelectric signal, performs spectrum analysis and characteristic signal extraction on the received signals to generate corresponding action control signals, and outputs the action control signals to the power amplifier for amplification; and the electromagnetic actuator is arranged on the middle shaft and receives the amplified control signals to generate a corresponding longitudinal actuation force applied on the middle shaft, thereby implementing the control for the longitudinal vibration of the shafting. The electromagnetic active control device for longitudinal vibration of the marine shafting effectively reduces the longitudinal vibration of the shafting, so that vibration response of a marine structure is reduced finally, and the control device not only is effective to low frequency line spectra, but also has excellent control effect on broadband random excitation.

Disclosed is a tie coat which is formed on a surface of a base or an undercoating film prior to formation of an organopolysiloxane-based antifouling coating film and is formed from a moisture-curing organopolysiloxane-based composition comprising (b1) organopolysiloxane having condensing functional groups at both ends of a molecule and / or (b2) a curing composition formed by subjecting the component (b1) and an extender pigment selected from the group consisting of silica, calcium carbonate, talc, mica, clay, kaolin and barium sulfate to contact treatment with heating or without heating. Also disclosed is a composite coating film wherein on a surface of the above tie coat is formed a finish coat formed from a three-pack type organopolysiloxane-based curing composition comprising (c1) a main agent comprising the component (b1), (c2) a curing agent component comprising tetraalkoxysilicate or its condensate and (c3) a curing accelerator component comprising a metallic compound. Further disclosed is a composite coating film wherein an epoxy-based sealer coat, the tie coat and the finish coat are formed in this order on a surface of an old antifouling coating film (G). There is provided by the invention a tie coat capable of forming a composite coating film having excellent interlaminar bond property. The composite coating film is favorably formed on a surface of a base, an undercoating film, an old antifouling coating film or the like, has excellent interlaminar bond strength and antifouling property and is preferably used for coating outer surfaces of ships, submerged parts of marine structures, water supply / drainage channels of atomic power plant, etc.

Universal Framed Cofferdam has prefabricated skeletal steel space framing formed from multiple steel vertical pipes and two levels of horizontal diaphragm trusses rigidly connected to pipe columns. Beams of each diaphragm truss are attached to vertical pipes of the framing with rigid moment connections creating a rigid space frame of the perfectly round form that is used as a false work of the Cofferdam. Wales of the Cofferdam and short pieces of the flat sheet piling are attached to the vertical pipes forming a skeleton of the Cellular structure. The Skeleton of the Universal Framed Cofferdam is prefabricated in the convenience of the Dry Dock and than floated to the site. Buoyancy of the framing allows Cofferdam skeleton transportation without using the barge or otherwise necessary floating devices. Once brought to the site of installation Cofferdam skeleton is installed vertically in position and leveled on the bottom of the river bed. If necessary river silt can be jetted and pumped out of pipe annular space and pipe columns of framing can be simultaneously lowered in position by using vibro—hummer. After space framing installation, rock sockets are predrilled through the annular space of vertical pipes and rock anchors installed. Sheet pile skin of the Cofferdam installed between pipe columns concludes Cofferdam Can erection. Universal Framed Cofferdam Can than filled with compacted gravel and becomes a Hybrid Gravity Caisson / Columnar water front or marine structure that has the best features of the Conventional Cellular Cofferdam and of Columnar Dolphin structure. It has enhanced sliding and overturning stability provided by Rock anchors preloaded by Cofferdam granular fill and has effective mechanism that prevents concave or convex surface of rupture failure that may be suffered by conventional Cellular Cofferdams, and has mechanism that more effectively resists deep surface sliding failure of the Cofferdam base.

Provided is a fuel supply system for a marine structure using a high-pressure natural gas injection engine, for example, an ME-GI engine, in which boil-off gas generated in an LNG storage tank is compressed to a medium pressure, reliquefied, compressed to a high pressure, gasified, and then supplied to the high-pressure natural gas injection engine. The fuel supply system for a high-pressure natural gas injection engine includes: a boil-off gas (BOG) compression unit configured to receive and compress BOG generated in a storage tank storing a liquefied gas; a reliquefaction apparatus configured to receive and liquefy the BOG compressed by the BOG compression unit; a buffer tank configured to receive the liquefied BOG from the reliquefaction apparatus and separate the reliquefied BOG into a gaseous component and a liquid component; a high-pressure pump configured to receive the liquid component from the buffer tank and compress the liquid component; and a high-pressure gasifier configured to gasify the liquid component compressed by the high-pressure pump and supply the gasified liquid component to the high-pressure natural gas injection engine. The liquid component supplied from the buffer tank to the high-pressure pump has a pressure of 12 to 45 bara (absolute pressure).

A conductive marine antifouling paint and a preparation method thereof, belonging to the technical field of preparation and application of marine antifouling paint and in particular relating to the preparation and application of nontoxic conductive marine antifouling paint. Firstly, a composite antifouling composition is prepared by taking super-fine tourmalin powder and nano zinc oxide powder as materials and coating a layer of silicon dioxide on the surface of the super-fine tourmalin powder and nano zinc oxide powder, and the nontoxic conductive marine antifouling paint is prepared by dispersing composite antifouling composition, film-forming matter, conductive powder and addition agent. The conductive marine antifouling paint is applicable to antifouling protection of boats and ocean structures and has the good effect of preventing the adhesion of halobios. The invention is mainly suitable for antifouling protection of boats and ocean structures.

Disclosed is a system and method for static and dynamic positioning or motion control of a marine structure by using real-time monitoring of at least one of a mooring line, marine environments, 6-dof movement of a marine structure, a tank state, a ship topside, the seabed, or their combinations. The static and dynamic real-time monitoring data of the mooring line is obtained and processed for positioning the marine structure or controlling and managing a motion thereof. Here, 1) a tension of a mooring line is measured by means of real-time monitoring of the mooring line, 2) various marine environment elements such as wind direction, wind speed, air humidity, atmospheric pressure, atmosphere temperature, cloud height, visibility, ocean wave, wave height, sea current speed, sea current direction, rain or the like are measured by means of real-time monitoring of the marine environments, 3) 6-dof movement of the marine structure is measured by means of real-time monitoring of the marine structure, 4) ullage and sloshing data of various tanks in the marine structure are measured by means of real-time monitoring of tank states, 5) damage and life of pipes, facilities or the like located at a ship topside of the marine structure are measured by means of real-time monitoring of the ship topside, 6) damage and life of umbilical cables, pipes, pumps and valves located on the seabed are measured by means of real-time monitoring of the seabed, and suitable static and dynamic positioning or motion control and management may be automatically performed based thereon.

A cantilever robot for both hydraulic and pyrologic jobs, such as building ship or water-surface structures and heat treating of metallic materials, is composed of a movable base, a rotary tower, a cantilever mechanism, and vertically lifting manipulator with rotary joints. Its advantages are large job space, high flexibility and reliability, and light weight.

The invention discloses a diving slamming experimentation device for an ocean structure. The diving slamming experimentation device for the ocean structure comprises the structure, a power system, a load rejection system, a control and measurement system, a buffer system and a substrate, the power system mainly comprises a motor seat, a screw rod, a vertical lead rail, an optical axis and a screw rod; the load rejection system comprises a primary load rejection carriage, a secondary load rejection carriage, an electromagnet and a slide block; the control and measurement system mainly comprises a computer, a data gatherer, a constant-voltage direct current power supply, and an upper and a lower limit switch, the buffer system comprises a buffer substrate, a spring bumper and a buffer platform, the control and measurement system controls through motor motion and magnetic force of the electromagnet to realize primary load rejection and secondary load rejection, the structure falls into the water, and a pressure sensor arranged on the structure returns the measured data to the computer through the data gatherer. The diving slamming experimentation device for the ocean structure is simple in structure, convenient to operate, stable in move and suitable for the diving slamming experiments for different types of ocean structures.

The invention relates to a rotatable fairing (1) for a marine riser (2) or other slender marine structure. The fairing (1) is arranged on the riser for reducing watercurrent-induced stresses on said riser (2), said fairing (1) having a tail portion (3) for trailing generally in the downstream direction behind said riser. The fairing (1) is provided with an attenuation unit (8) for counteracting the unstable rotation of said fairing (2) relative to said riser (2), in order to prevent undesired vibrations of said riser (2). The fairing is provided with one or more clamps (10) for attachment to and around a periphery of said riser (2), said clamps (10) arranged with a gear rim (12) for engagement with an actuating cogged wheel (14) of said attenuation unit (8).

Solid compositions containing low water solubility 3-isothiazolone compounds and carbon-based adsorbents that do not rapidly release the 3-isothiazolone when added to a locus to be protected are disclosed. In particular, methods of controlling or inhibiting the growth of marine organisms using the controlled release solid compositions in paints and coatings for marine structures is disclosed.

The invention relates to a preparation method of an antifouling material having a crossed regular microstructure on the surface. The method comprises the following steps of: etching a microstructure with a crossed pattern on a photomask, and arranging crossed cylindrical basic units with conical tail ends in a staggered way to form an array; forming a microstructure of a specified depth on the surface of a silicon chip by adopting a plasma deep silicon etching process; and preparing the antifouling material with themicrostructure by adopting a method for rolling over and copying polydimethylsiloxane. Due to the adoption of the crossed pattern of the microstructure and the arrangement mode, the contact area between a fouling organism and the material is reduced, the surface hydrophobicity of the material is enhanced, and adhesion of fouling organisms such as ulva spores, diatoms, barnacle larvae and the like can be effectively prevented. According to the material, an antifouling effectis achieved by using the microstructure on the surface, and loss is avoided; and moreover, the antifouling material can be self-cleaned under the action of water current erosion, is an environmentally-friendly antifouling material, and can be used for preventing and eliminating bio-fouling on the surfaces of ships and marine structural objects under marine environment.

The invention discloses a marine environment and dynamic load coupling test equipment system, which comprises marine environment simulation environment box equipment (1) and an electro-hydraulic servo dynamic and static testing machine (2), wherein the electro-hydraulic servo dynamic and static testing machine comprises a testing machine loading head which applies power load to a test piece, a dynamic load control circuit and an electronic control cabinet; the electronic control cabinet is used for providing saline water and compressed air for a saline water spraying device; the electronic control cabinet is connected with the saline water spraying device via an air pipe and a water pipe; the test piece is fixedly arranged on a test piece support in the body of the marine environment simulation environment box; and the test piece is subjected to loading compression, stretching and bending deformation loading under different environments of saline water dipping, saline water fluctuation and saline water atomization. According to the marine environment and dynamic load coupling test equipment system disclosed by the invention, dynamic load as well as the environments of saline water dipping, saline water fluctuation and saline water atomization can be simultaneously provided for the experiment test piece, the characteristics of marine structure service under the marine environment conditions, such as marine underwater areas, water table fluctuation areas, splash areas and the like, can be simulated.

Disclosed are marine coating compositions that are useful to inhibit the fouling of a marine structure by a broad spectrum of organisms. Generally, the marine coating composition comprises an antifouling agent and an organic vehicle.

The present invention relates to liquefied gas storage tanks and a marine structure comprising same. The storage tanks comprises a plurality of liquefied gas storage tanks which are respectively installed in plural spaces which are partitioned off by a coffer dam installed inside the hull of the marine structure, and are arranged in two lines inside the marine structure. The coffer dam comprises one or more longitudinal and widthwise coffer dams which are respectively extended in the longitudinal and widthwise directions of the hull. The liquefied gas storage tank is sealed and thermally insulated by consecutive sealing and thermal-insulating walls without disconnection. The longitudinal coffer dams support the load of upper structure, and simultaneously suppress the phenomenon of shaking.

The present application discloses a fouling control coating composition comprising a polysiloxane-based binder system, 0.01-20% by dry weight of one or more hydrophilic-modified polysiloxanes, and one or more biocides. The hydrophilic-modified polysiloxane may be a poly(oxyalkylene)-modified polysiloxane, e.g. a polysiloxane having grafted thereto poly(oxyalkylene) chains and / or having incorporated in the backbone thereof poly(oxyalkylene) chains. The poly(oxyalkylene) may e.g. be selected from polyoxyethylene, polyoxypropylene and poly(oxyethylene-co-oxypropylene) (polyethylene glycols / polypropylene glycols). The application further discloses a marine structure comprising on at least a part of the outer surface thereof an outermost coating prepared from the coating composition. Moreover, the application discloses the use of the combination of non-reactive hydrophilic-modified polysiloxanes and biocides, wherein the weight ratio between the hydrophilic-modified polysiloxanes and the biocides is in the range 1:0.2 to 1:6, for improving the antifouling properties of a polysiloxane based coating composition.

The present invention provides a process for obtaining a non-toxic coating suitable for preventing attachment of fouling organisms on marine structures which involves applying onto a substrate a coating composition and curing the coating composition to yield a water-insoluble hydrophilic coating wherein the coating composition includes at least one cellulose ester and at least one organic solvent which possesses a sufficiently slow evaporation rate in order to yield a coating which is substantially smooth and non-porous. The invention also pertains to the reaction of the cellulose esters in the coating compositions with crosslinkers to provide improved toughness for coatings on substrates that are submerged in water. The invention also relates to the application of the coating composition to a substrate to be subjected to a marine environment. In a further aspect, the coating composition is applied as a clearcoat to a previously coated substrate.

The invention discloses a novel nanometer reinforced, non-transition-layer, organosilicone and low-surface-energy type antifouling paint which can be directly coated to a base material and an epoxy primer without an intermediate transition layer. The antifouling paint comprises the following components in parts by weight: 10 to 20 parts of A, 2 to 10 parts of B, and 0.1 to 2 parts of C, wherein the component A comprises the following materials in parts by weight: 25.0 to 50.0 parts of nanometer pre-dispersed slurry, and 0.5 to 5.0 parts of silicone oil; the component B comprises the following materials in parts by weight: 3.0 to 50.0 parts of crosslinking curing agent, and 1.0 to 10.0 parts of silane coupling agent; the component C comprises the following materials in parts by weight: 0.1 to 3.0 parts of catalyst. The coating has the advantages of being high in intensity, high in attaching force, easy to be constructed, and high in recoatability, and can be applied to various ships, offshore oil platforms, ocean structures and facilities, and mariculture nets and the like.

The invention belongs to the field of metal material corrosion, and particularly relates to a method for enhancing the corrosion resistance and fatigue resistance of ocean structural steel, so as to prolong the engineering service life of the ocean structural steel. The method comprises the following steps: 1) surface purification treatment; 2), sand blasting for derusting; 3), electric arc spraying of zinc-aluminum alloy; 4), surface cleaning and spraying detection; 5), sealed treatment; 6), spraying or brushing of a seal coating. The ocean structural steel prepared according to the method is high in corrosion resistance and fatigue resistance, so as to be widely applied to ocean engineering conveniently.

The invention discloses a zinc-induced-crack-resistant steel plate and a manufacturing method thereof. Low alloy steel subjected to low C-ultralow Si-high Mn-low Als-(Ti+Nb) micro alloying treatment is taken as a basis, the Als content of the steel is appropriately reduced, situations that Mn / C is greater than or equal to 15, [(%Mn)+0.75 (%Mo)]* (%C) is less than or equal to 0.16, Nb / Ti is greater than or equal to 1.8, Ti / N is 1.50-3.40, CEZ is less than or equal to 0.44%, the B content is less than or equal to 2 ppm, and Ni / Cu is greater than or equal to 1.50 are controlled, the Ca treatment is performed, the Ca / S ratio is controlled to be 1.0-3.0, (%Ca)*(%S)0.28 is controlled to be less than or equal to 1.0*10<-3>, and a TMCP (Thermal Mechanical Control Process) is optimized, so that the micro-structure of a finished steel plate is a ferrite-dispersedly distributed tiny bainitic colony, the average grain size is less than 10 mu m, and homogeneous excellent mechanical properties, excellent weldability and zinc-induced-crack-resistant properties are obtained, therefore, the zinc-induced-crack-resistant steel plate is especially suitable for being used as a zinc-spray coating anti-corrosion steel plate for marine structures, a zinc-spray anti-corrosion steel plate for extra-high voltage power transmission structures, a zinc-spray coating anti-corrosion steel plate for coast bridge structures, and the like.

A system and method for mating equipment offshore to a spar buoy secured to a foundation without the use of a crane barge. The system comprises a floating vessel having a pair of forks defining a slot. A gimbal table, defining an opening, is positioned within the slot and connected to the vessel and a locking collar is mounted to the gimbal table. A mating member is attached to the spar buoy. The vessel is maneuvered to bring the spar buoy within the gimbal table opening. With the spar buoy positioned within the gimbal table opening, the locking collar is arranged and designed to releasably attach to the mating member of the spar buoy and restrict relative vertical motion between the spar buoy and the vessel while the gimbal table allows the floating vessel to roll and pitch without driving these motions into the spar buoy.

A method and a system are provided for safely mooring seagoing vessels on the high seas and in other unprotected waters. The present invention allows a large vessel to berth close enough to a marine structure side-by-side that the vessel can be loaded and unloaded in most environmental conditions using conventional loading arm equipment. Vessels may be moored side by side to the marine structure using one or more floating bollards anchored to the sea floor and provided with guards. The preferred type of floating bollard is a triangular semi-submerged anchored buoy structure comprising three buoy sections or "caissons" arranged in a vertical fashion, three buoy shell sections or "pontoons" which support and separate the buoyancy The column member provides movement damping to the anchored buoy structure, and three horizontal support members hold the top of the buoyant column member in place.

The invention belongs to the technical field of antifouling material processing and relates to a method for preparing an antifouling material with surface of spherically raised microstructure which is formed by direct film forming. The antifouling material prevents marine growth from adhering to the surfaces of the ship and marine structures under marine environment. The method is characterized by first utilizing hydrogen-containing silicone oil and allyl methacrylate for hydrosilylation to synthesize a silicone component containing polymerizable double bonds, carrying out free radical copolymerization on the silicone component and acrylonitrile and acrylate monomers to form acrylate resin mixed liquor hinged with silicone gel particles, mixing the mixed liquor with resins and then coating films, thus obtaining the antifouling material. The mixed resin material has the characteristic of low surface energy. The characteristic of spherically raised microstructure is formed, thus improving the hydrophobic property of the antifouling material, so that the antifouling material prevents marine organisms from being contaminated. With the hydrophobic property being improved, the antifouling material reduces the possibility of organism adhesion, has no devastating impacts on the environment and has good application prospect, reduced surface energy, strong capability of preventing adhesion of diatom, simple and easily controlled preparation process and low cost.

The invention is about a preparation method and high per formance mixture of cement. The desalting sea sand is the main material, and others are cement, flyash, grinded fine coal powder and water. The mixture has high strength, good service behavior and good durability. It is ideal bearing cement for ecotype structure. And it can be applied in building structure, marine structure and hydro-structure.