6047results about "Pipe laying and repair" patented technology

A device for cutting a length of pipe includes a clamp portion for clamping around a length of pipe and a bow moveable with respect to the clamp portion that retains a loop of diamond embedded wire. The device further includes a feed for driving the bow with respect to the clamp portion and a detector for detecting bending of the wire and a control responsive to the detector for controlling feed rates. The device is made of modular parts and has synchronizing arms for clamping around a length of pipe. In one embodiment, the wheels are retained in enclosures with slots through which the cutting wire passes.

An apparatus and method for controlling a hybrid motor, The hybrid motor, uses a permanent magnet instead of a field coil for a rotor, winds a coil round a stator in a multi-phase independent parallel manner, fixes a rectifying type encoder to the rotor and connects a sensor to a driving circuit. The apparatus comprises: an encoder attached to a rotor in cooperation with a pole sensor a speed input unit for generating a speed instruction signal a power switching circuit to generate motor driving signals; a drive module receiving the speed instruction signal and the sensor signal and outputting the speed instruction signal synchronized with the sensor signal as a driving motor signal; a power supply for applying a DC voltage to the power switching circuit; A logic power supply for converting the DC voltage into a logic voltage, and applying logic voltage to the drive module. The motor has n phases, n power switching circuits and n drive modules.

A downhole tractor is provided that includes a housing and a first wheel assembly coupled to the housing that is operable to translate away from the housing in a first direction. The first wheel assembly has a first electric motor, a first wheel, and a first reduction gear assembly coupled between the first electric motor and the first wheel. A second wheel assembly is coupled to the housing and is operable to translate away from the housing in a second direction that is opposite to the first direction. The second wheel assembly has a second electric motor, a second wheel, and a second reduction gear assembly coupled between the second electric motor and the second wheel. A fluid ram is coupled to the first and second wheel assemblies for selectively translating the first and second wheel assemblies toward and away from the housing. A first controller is provided for controlling the flow of current to the first and second electric motors. On-board and surface control systems may be incorporated to permit selective active of the wheels assemblies. In addition, couplings and connectors employing shape-memory materials may be included to secure the tractor to coiled tubing or a wireline.

Certain spin-coatable liquids and application techniques are described, which can be used to form nanotube films or fabrics of controlled properties. A spin-coatable liquid for formation of a nanotube film includes a liquid medium containing a controlled concentration of purified nanotubes, wherein the controlled concentration is sufficient to form a nanotube fabric or film of preselected density and uniformity, and wherein the spin-coatable liquid comprises less than 1×1018 atoms / cm3 of metal impurities. The spin-coatable liquid is substantially free of particle impurities having a diameter of greater than about 500 nm.

The present invention provides a nonwoven web laminate having at least a bimodal pore size distribution. The laminate has a first layer with pores having a mean equivalent pore radius greater than about 100 μm and a second layer with pores having a mean equivalent pore radius less than about 100 μm. Generally, the first layer has a mean equivalent pore size radius in the range of about 1 μm to about 100 μm and the second layer has a mean equivalent pore size radius in the range of about 100 μm to about 1000 μm. The layer having an average pore size radius greater than 100 μm provides rapid fluid release from the laminate to facilitate cleaning by providing a cleaning solution to solubilize particles or viscous liquids on the surface. In addition, the large pore size allows particles and viscous liquids to be captured and trapped within the pores of the laminate, thereby effectively cleaning the surface to be cleaned. The layer with the small pore size provides a fluid reservoir function by absorbing fluid and holding the fluid in the laminate, or by holding a cleaning fluid to be released during a cleaning operation. The nonwoven web laminate of the present invention is an effective wiper.

A reinforcement liner and methods of manufacturing the liner are disclosed. The liner includes a fabric material having first and second support layers. Each of the layers includes reinforcing fibers. The first and second support layers are oriented in different directions to provide support to the liner in those directions. The liner includes a stitching material that is used to couple the first and second support layers together. The stitching material is preferably an elastic yarn. One of the support layers includes long, chopped strands that are oriented parallel to each other. The long, chopped strands are directed so that they are in the peripheral direction of the finished reinforcement liner. The long, chopped fibers can be distributed continuously or only along portions of the width of the fabric. The disclosed methods of manufacturing a liner include alternative processes by which the liner can be made. The fabric is manufactured in the form of a continuous roll. One method involves winding the roll in a helical pattern about a fixed mandrel. Another method involves mounting several rolls circumferentially about a mandrel. The rolls are mounted so that strips of fabric from each roll overlap a portion of adjacent fabric strips to provide a continuous liner surface on the mandrel.

An electronic marker locator with a digital architecture for providing accurate and consistent estimation of the signal strength is presented. The marker locator includes a Digital Phase-Locked Loop (DPLL) structure. The electronic marker locator transmits known and adjustable frequency bursts corresponding to the markers to be located while synchronously capturing the signals returned from the markers. Because of the convergence properties of the DPLL, very consistent measurements of the reflected marker signal field strength are possible, resulting in both an improvement of maximum detection depth and depth accuracy. Further, the analog front-end hardware can be reduced, offering wider resistance to component tolerances, lower calibration and test times, and flexible frequency selectivity.

A liquid filled dike is described. The dike is formed of a flexible material selected to contain water. The dike includes at least two bladders which extend at least a portion of the length of the dike. The dike can be transported in empty condition and filled on site. When it is no longer required at a particular site, the dike can be emptied and stored for later use. The dike is self-leveling and may include a leak detection system.

The present invention comprises a skid that includes at least one stackable pedestal having a continuous wall, the continuous wall enclosing an opening that extends from a first pedestal end to a second pedestal end. The stackable pedestal includes at least two support blocks, each support block having a top surface height that places a stacked pedestal at a raised position over a previously placed pedestal to prevent surface-to-surface contact between the adjacent stacked pedestal walls. A yoke is demountably coupled to the second pedestal end of a single pedestal, or to the second pedestal end of a last stacked pedestal in the skid, and the yoke includes a cradle shaped to support a pipe.

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.