1474 results about "Submarine pipeline" patented technology

A method and apparatus for repairing a submerged pipeline. The method comprises installing a pair of hot tap tees on either side of the damaged section of pipeline, cutting a hole in the pipeline through each hot tap tee, inserting and securing plugging pigs into the pipeline, cutting and removing the damaged section of pipeline, and installing a new section of pipeline. The apparatus includes a plugging pig for use during repair of a damaged pipeline comprising a body shaft, a cup seal secured to the body shaft for engaging an interior wall of the pipeline, a cam attached to the exterior of the body shaft, a slip assembly for sliding on the cam and engaging a slip against the pipeline wall, and a control mechanism for engaging and releasing the slip from the wall.

A apparatus and method of using the apparatus for removing a blockage in a subsea pipeline without retrieval of the pipeline to the surface. The apparatus components include a hot tap saddle, a drill assembly, a fluid blaster assembly and a support frame. The hot tap saddle component has a first portion and a second portion, with the first and second portions being configured to clampingly engage in a sealing relationship to the subsea pipeline. The first portion of the saddle includes a first and second opening with the first opening extending generally upwardly and configured for connecting to a drill assembly and the second opening being positioned generally at an angle to the first opening and configured for connecting to a fluid blaster assembly. The fluid blaster assembly including a nozzle, a hose and a high pressure pump with the fluid blaster assembly being contained within a pressure vessel. The fluid blaster assembly is configured for mounting to the second opening of the hot tap saddle component. The support frame assembly is configured for gripping and supporting the subsea pipeline on the sea floor while the fluid blaster assembly operates to remove a blockage in the subsea pipeline with the pipeline being under pressure and without severing the pipeline.

The method of taking a remotely operated vehicle to the ocean floor to land on and move along a subsea pipeline above or below the seafloor and repeatedly circulate seawater which has been heated electrically, mechanically, or chemically across the outer surface of the pipeline to melt hydrates or paraffins which have formed on the inside of the pipeline.

The disclosed detector comprises: a driver, a magnetic-leakage probe, a magnetic-leakage signal process device with a rotary coder, a power, an ultrasonic probe, and a ultrasonic signal processor with a roller carried a milometer all connected by gimbals in turn. This invention integrates both magnetic-leakage and ultrasound, realizes precise positioning to defect in pipeline, and can detect the defect and hidden danger all round.

The present invention relates to an installation providing a bottom-to-surface connection for an undersea pipe resting on the sea bottom, in particular at great depth, the installation being of the hybrid tower type having a static base placed on the sea bottom. In the installation of the present invention, said pipe resting on the sea bottom is connected by a flexible pipe element constituting a bend to a vertical riser whose bottom end is held in fixed position relative to said base.

The present invention provides an insulated pipe comprising a pipe and a composite insulation system, said composite insulation system comprising: (a) a first insulation layer comprising a first insulation material having a thermal conductivity k-factor value of less than 0.023 W / m-K at 38° C.; and (b) at least one additional insulation layer comprising an insulation material having a thermal conductivity k-factor greater than that of the first insulation material and a maximum operating temperature limit less than that of the first insulation layer. The composite insulation system is bonded to an exterior surface of the pipe with the first insulation layer facing towards said exterior surface of the pipe. At least one of said first insulation layer or said at least one additional layer extends continuously about the exterior surface of the pipe. The present invention further provides an insulated pipe for use in an undersea pipeline and an insulated pipe for use in a subterranean pipeline.

Apparatus and methods are described for subsea pipeline servicing, including line-pack testing, physical integrity testing, recovery of damaged sections of pipelines, and product removal from subsea structures. In one embodiment of the invention, a subsea pipeline service skid is provided including at least one sample collection bladder affixed to the skid and in fluid communication with a skid mounted pump dimensioned to pull a sample from the subsea pipeline. In another embodiment, a product removal bladder is provided for removal of the hydrocarbons from a subsea structure.

A marine pipeline comprising (a) pipe, (b) a coating that electrically insulates the pipe from sea water, and (c) an alternating current heating circuit comprising the pipe in series with ambient sea water, wherein the heat generated by alternating current flowing in the pipe is for improving flow of fluids through the pipeline. A marine pipeline comprising: a) pipe, b) a coating that electrically insulates the pipe from ambient sea water, and c) an alternating current heating circuit that is grounded to the ambient sea water and comprises the pipe in series with a return conductor, wherein the heat generated by the alternating current flow in the pipe is for improving flow of fluids through the pipeline.

A liquefied natural gas carrier uses a diesel engine or gas turbine propulsion plant fitted with a shipboard regasification system. The propulsion plant can provide either a direct mechanical drive of the propeller shaft and propeller, or can be fitted with an integrated electric power plant using an electric motor or motors to drive the propeller shaft and propeller. The regasification system includes a heat input source of exhaust gas heat exchangers, electric water heaters and supplemental heaters to provide an additional heat source to a hot water circulating loop. The liquefied natural gas contacts the hot water or heating medium circulating loop and is regasified. An undersea conduit from the ship transmits the regasified natural gas to an on shore plant.

A method for forming a field joints between sections of coated or insulated pipe which are to be welded together and incorporated into an undersea pipeline for carrying single or multi-phase fluids such as oil, gas and water. The method includes the application of a liquid epoxy layer which overlaps a lip of the factory-applied FBE coating protruding beyond a chamfered end of the factory-applied insulation layer, and which may be applied over the entire weld joint area. The liquid epoxy layer is partially cured by application of heat, and a layer of powdered adhesive is applied onto the partially cured liquid epoxy layer. The adhesive is subsequently sintered and activated by application of heat to its outer surface. The outer surfaces of the adhesive layer and the chamfers are then preheated and the thermal joint insulation is injection molded over the entire joint area. Throughout the entire method the temperature of the factory-applied FBE coating is maintained below its glass transition temperature so as to avoid weakening the bond between the FBE coating and the underlying steel pipe. The number and sequence of steps can be varied, depending at least partly on whether the liquid epoxy and adhesive layers are applied in a pipe coating facility or in the field.

The present invention relates to steel plate for making submarine pipeline and its rolling process. The steel plate has the chemical components including C 0.030-0.075 wt%, Si 0.10-0.30 wt%, Mn 1.40-1.60 wt%, P not more than 0.015 wt%, S not more than 0.003 wt%, Cu not more than 0.20 wt%, Ni 0.10-0.25 wt%, Mo 0.07-0.20 wt%, Nb 0.03-0.05 wt%, V not more than 0.060 wt%, Ti 0.001-0.02 wt%, Al 0.01-0.06 wt%, Cr not more than 0.20 wt%, N not more than 0.009 wt%, Ca 0.001-0.005 wt%, B not more than 0.0005 wt%, Sn not more than 0.010 wt%, As not more than 0.030 wt%, and Fe for the rest. The steel plate has high cleanliness, high strength and high toughness, and is used in producing submerged arc welded submarine pipeline.

An LNG terminal is disclosed which includes an offshore mooring turret, an LNG storage vessel operatively coupled to the mooring turret, the LNG storage vessel including at least one LNG storage tank for the storage of liquid natural gas and a regasification vessel operatively coupled to the LNG storage vessel. A method of operating an offshore LNG terminal is also disclosed which includes obtaining liquefied natural gas from at least one LNG storage tank on an LNG storage vessel that is operatively coupled to a mooring turret, regasifying the liquefied natural gas from the LNG storage vessel using a regasification vessel operatively coupled to the LNG storage vessel, and supplying the regasified gas to at least one subsea pipeline via the mooring turret.

A method of monitoring a subsea pipeline system connecting one or more wells to a floating production system, wherein the pipeline system is at least partially flexible, the method comprises installing a continuous optical fibre distributed sensor as part of the pipeline system, the sensor capable of providing a distributed measurement of temperature, vibration, pressure or strain, or any combination thereof; using the sensor to obtain a distributed measurement of temperature, vibration, pressure and / or strain along at least part of the pipeline system indexed to a length thereof; and using the distributed measurement to predict the actual condition of the fluid, the pipeline system and / or the adjacent sea water using a model. A subsea pipeline system for connecting one or more wells to a floating production system, wherein the pipeline system comprises at least one partially flexible pipeline; a continuous optical fibre distributed sensor installed as part of the pipeline capable of providing a distributed measurement of temperature and / or strain; means for obtaining a distributed measurement of temperature, vibration or strain, or combinations thereof, along at least part of the pipeline system indexed to a length thereof from the sensor; and means for using the distributed measurement to manage operation of the system. Preferably, the system comprises means for modelling expected pipeline behaviour using the distributed measurement as an input; and means for using the modelled behaviour to manage operation of the system.

PCT No. PCT / GB97 / 00721 Sec. 371 Date Mar. 18, 1999 Sec. 102(e) Date Mar. 18, 1999 PCT Filed Mar. 11, 1997 PCT Pub. No. WO97 / 39273 PCT Pub. Date Oct. 23, 1997This invention relates to a method and equipment whereby a pig (11) launched into a gas injection line (5) can be inserted into a hydrocarbon flow line (2) in a position close to the subsea wellhead or manifold (1) without interrupting the flow of hydrocarbons and with minimum interference to the process of gas injection.

A gelled composition for pipeline, flowline, pipeline jumper or flowline jumper dewatering or preventing ingress of seawater into open pipeline systems or components during tie-in operations of jumpers or additional pipe, valving, manifolds, subsea pipeline architecture or flow conduits operations is disclosed, where the composition includes a concentrated metal formate solution and a hydratable polymer. The gelled formate compositions have improved dewatering properties with 100% or 360 pipe coverage. The gelled formate compositions have can also be reused by breaking and reformulation.

A system is described for offloading LNG (liquified natural gas) from a tanker for eventual delivery to an onshore gas distribution station. The system includes a floating structure that floats at the sea surface and that is connected to the tanker so they weathervane together. The floating structure carries a regas unit that heats the LNG to produce gas, and delivers the gas through a riser to an underground cavern that stores the gas. Gas from the cavern is delivered through a seafloor pipeline to an onshore gas distribution station. The regas unit includes water pumps and other equipment that is powered by electricity. The electricity can be obtained from an electric generator on the floating structure, with surplus electricity delivered through a sea floor electric power line that extends along the sea floor to an onshore electricity distribution facility. The electricity can instead be obtained by delivery from an onshore facility though a sea floor electric power line that extends up to the floating structure and to the regas unit.

Methods and apparatus for the installation of VIV suppression during the S-Lay installation of a subsea pipeline. A locking member will be interposed between a pipe and a fairing rotatably mounted on the pipe, sufficient to bias the fairing against rotating. Upon marine application, the locking member will degrade, thereby releasing the fairing.

The method of prevention of hydrate formation inside a subsea pipe of a first temperature during an increase in flow within the pipe comprising containing a volume of water outside the pipe, heating the volume of water to a second temperature higher than the first temperature such that the pipe is heated to a temperature high enough to stop the formation of the hydrates, and increasing the flow in the pipe.

The invention discloses a multi-channel data acquisition device for a submarine pipeline magnetic flux leakage internal detector. The multi-channel data acquisition device comprises a hall sensor, a multi-path switch, an instrument amplifier, an analog-to-digital (AD) conversion module, a field programmable gate array (FPGA), a digital signal processor (DSP) and a secure digital memory (SD) card, wherein the multi-path switch has a two-stage series structure; the multi-channel data acquisition device is provided with heat insulation cotton so as to adapt to a specific high-temperature and high-corrosion environment of a submarine pipeline; the hall sensor converts the magnetic induction density into voltage; the voltage is switched by the multi-path switch, so that a signal is transmitted to the instrument amplifier; the instrument amplifier amplifies a weak signal; the AD conversion module sets sampling for eight times through software, performs analog-to-digital conversion, and transmits a digital value to the FPGA after the conversion; and the DSP receives FPGA cached data, digitally filters and compresses the cached data, and finally stores the data into the SD card. Due to a dual central processing unit (CPU) structure consisting of the FPGA and the DSP, a large amount of data can be stored and processed; the device has the characteristics of high speed, multiple channels, high resolution and the like; furthermore, pipeline transportation safety is guaranteed; and early maintenance is facilitated.

The invention discloses a method and device for simulating axial interaction between an undersea pipe system structure and a seabed soil body. The method includes the following steps that a model pipeline is selected, counterweight is conducted on the model pipeline according to the requirement, and then a tension sensor for measuring axial sliding resistance of the model pipeline is installed in the model pipeline; a water tank is selected, and a simulated seabed with the needed slope is manufactured in the water tank; a guide restraint device is installed on the model pipeline, the model pipeline is made to horizontally move only in the axial direction of the model pipeline and the direction perpendicular to the bed surface of the simulated seabed, meanwhile a displacement measurement device for measuring displacement of the model pipeline in the axial direction of the model pipeline and the direction perpendicular to the bed surface of the simulated seabed is installed on the guide restraint device, and the model pipeline is arranged on the simulated seabed; axial loading is conducted on the model pipeline, the model pipeline is made to axially slide, and meanwhile a data synchronous acquisition system is used for synchronously acquiring measurement data. An ideal means is provided for research on axial interaction between an undersea pipeline and the seabed.

The invention discloses a greenhouse seedling culturing, irrigating and fertilizing integrated system which comprises a water supply system, a fertilizer infusing system, a sensor water fertilizer detection device and a PLC (Programmable Logic Controller) control system, wherein the fertilizer infusing system is respectively connected with the water supply system and a fertilizer storage tank; the water supply system is connected with an irrigating pipeline system by virtue of a main pipeline; the water supply system comprises a water pump and a main pipeline; the main pipeline is provided with a filter; the main pipeline is respectively provided with pressure gauges and an electromagnetic valve switch; the fertilizer infusing system comprises a fertilizer mixing tank; the pipeline is provided with an electromagnetic flow regulator and a fertilizer infusing electromagnetic valve switch; the PLC control system is respectively connected with an HMI (Human Machine Interface), the sensor water fertilizer detection device, the front pressure gauge, the rear pressure gauge, the front electromagnetic valve switch of the main pipeline, the rear electromagnetic valve switch of the main pipeline, the electromagnetic flow regulator and the fertilizer infusing electromagnetic valve switch.The greenhouse seedling culturing, irrigating and fertilizing integrated system is high in degree of automation, can be conveniently moved in an indoor soft and wet ground, and can be used for enlarging the irrigating range, improving the working efficiency and lowering the labor intensity of users.

The invention discloses a resistance choke type tiny particle and cell detection micro-fluidic chip and a preparation method. A PDMS (polydimethylsiloxane) cover plate (1) and a substrate (2) are bonded to form the resistance choke type tiny particle and cell detection micro-fluidic chip, the shape and the size of the substrate (2) adapt to those of the cover plate, at least one pair of tiny electrodes (8) are arranged on the substrate (2), a micro-fluidic pipeline is arranged on the cover plate, one surface of the substrate (2) with the tiny electrodes and a contact surface of the micro-fluidic pipeline contacting with the substrate are bonded in an aligned manner, the micro-fluidic pipeline is closed and comprises a sample inlet (4), a main pipeline (7) and a sample outlet (3), and the main pipeline (7) is provided with a sample inlet pipeline (10), a shrinkage detection pipeline (11) and the narrowest portion (5). A complex pipeline and fluid control system needed by sheath fluid focusing technology is avoided, flow resistance increase effect caused by pipeline size reduction is avoided by optimized structural size parameters, and detection throughput and sensitivity are improved.

The invention discloses a simulation method for detecting the side direction stability of a directly paved submarine pipeline and a simulation device; the invention firstly prepares a soil sample to simulate a seabed, mounts a test pipeline, releases the pipeline to lead the pipeline to generate initial sedimentation under the action of self-gravity when the pipeline is just contacted with the seabed and simultaneously adopts a laser displacement sensor to measure the initial sedimentation amount of the pipeline in a soil body, applies an incline pull to the pipeline through a stepping motor to simulate the actions of a horizontal daggling force and a vertical lifting force of a sea flow to the pipeline, and simultaneously measures the pull of the stepping motor, a horizontal displacement and an additive sedimentation amount during the side direction destabilization process of the pipeline, a displacement field of the soil body at the lower side during the side direction destabilization process of the pipeline, and a soil pressure of the side direction. The utilization of the simulation method and the simulation device of the invention can effectively simulate a bearing soil body, the horizontal dragging force and the vertical lifting force of the single-direction sea flow to the pipeline, etc., of the directly paved submarine pipeline and can monitor the stability parameters like the limit side direction soil resistance of a pipeline foundation in real time, thus being capable of simulating the side stability of the directly paved submarine pipeline.

A 'cabin-in-cabin' working cabin for ordinary-pressure dry welding of underwater pipeline is composed of primary regulating frame, secondary regulating frame, high-pressure cabin, and ordinary-pressure cabin positioned in said high-pressure cabin. Said orindary-pressure cabin is divided into left and right cabins and only welding is conducted in the ordinary-pressure cabin. Its advantage is high welding quality.

The invention provides a seabed pipeline simulation impact test system. The test system comprises a door-shaped support frame across an earth pond, a pipeline for simulating a seabed pipeline is arranged in the earth pond, a crossbeam of the door-shaped support frame is provided with a moving seat capable of performing translation along the crossbeam, a slide guide rail is vertically arranged below the crossbeam from the moving seat in an extending manner, the moving seat is provided with a lifting winch, the lower end of the lifting winch is suspended with a simulation impact object arranged along the slide guide rail in a sliding manner, the seabed pipeline is positioned right below the crossbeam of the door-shaped support frame, one end of the seabed pipeline is connected with a fixed support frame, the other end of the seabed pipeline is connected with a loading axial load device and a translation support frame in sequence, the seabed pipeline is a sealed pipe body, and one end of the seabed pipeline is connected with a loading internal pressure device. According to the simulation test system, impact test simulation of falling objects for the pipeline can be realized in the conditions of pre-added axial load and internal pressure of the pipeline, and simulation impact tests of the pipelines in the conditions of different lengths, embedding depths, impact positions, and impact contact surface shapes can be conducted.

The invention provides a deep water submarine pipeline axial aiming machine, comprising a main body frame, an underwater robot connecting frame, a jointing device, clamping devices and adjusting devices; wherein the two sides of the bottom of the main body frame are provided with a foundation beam, the jointing device is respectively arranged on the foundation beams at the two sides, two cross beams opposite at the upper part of the main body frame are respectively provided with a clamping device and an adjusting device; and the upper part of the main body frame is connected with the underwater robot connecting frame. The machine clamps a new pipeline on a working mother boat, the machine and the new pipeline are dragged onto a designated H-shaped frame by an ROV, or the machine is directly dragged onto a new pipeline placed on the H-shaped frame by an ROV and then the pipeline is clamped by the clamping device, adjusting on the distance between the new pipeline and a butt pipeline and jointing operation are carried out with the coordination of a jointing tool, and meanwhile longitudinal position and transverse position of the new pipeline can be adjusted, so that the aiming accuracy of new and old pipelines can satisfy the requirement of bolt flange connection machine and deep water submarine pipeline butt quality is effectively improved.

The invention relates to an ocean floor PE tube edge application edge burying construction method, the method integrates submerged pipeline and undersea cable construction technique, the PE tubes solders segment by segment on the application tube ship, then applied into ocean floor with support tube frames, meanwhile the tails of the support tube frames directly connect to a submerged pipeline burying machine, the tube application reaches the plough groove bottom at same time of reaching the ocean floor, then the pipeline is buried under sea floor by nature back silting. The method may secure continuous welding construction of the whole pipeline, and prevent flange connector of pipeline in medium sea; the invention conserves plentiful manpower, physical resources, reduces destruction to surroundings, and resolves problem that the underwater plough groove digging back silting is quick at same time; application and depth of burial of the pipeline can be achieved by integrating the pipe-laying ship and the burying vessel into one, and construction cost is greatly reduced.

The invention discloses a method for mounting a main return loop of a nuclear power station pressurized water reactor coolant system, which is characterized in that: a main pipeline heat section bend (16) and a main pipeline transition section bend (17) are welded at a loop nozzle of a lower seal end of the used steam generator (1); during mounting, a welding line (9) between a main pipeline heat section (13) and the main pipeline heat section bend (16) on the lower part of the steam generator (11) and a welding line (2) between the main pipeline heat section (13) and a reactor pressure container (10) can be assembled and welded simultaneously. In addition, the working amount for a welding line (5) is reduced during mounting. The mounting method can better control and guarantee the assembling and welding quality, improve the working efficiency, reduce the mounting time, and shorten the construction period.