A process for lining a steel pipe for the subsea transport of fluids comprises machining of an annular cavity in an inner wall of the pipe to be lined. The cavity is set back longitudinally relative to an end of the pipe. The deposition by welding of a first resurfacing layer includes a corrosion-resistant metal alloy on the inside of the cavity. Surface machining of the first resurfacing layer is done to the internal diameter of the pipe. A liner made of corrosion-resistant steel alloy is introduced into the pipe. Deposition by welding includes at least one second resurfacing layer made of corrosion-resistant metal alloy on the inner wall of the pipe between the end of the liner in contact with the first machined resurfacing layer and the corresponding end of the pipe. Surface machining of the second resurfacing layer is done to the internal diameter of the pipe.

A process for lining a steel pipe for the subsea transport of fluids comprises machining of an annular cavity in an inner wall of the pipe to be lined. The cavity is set back longitudinally relative to an end of the pipe. The deposition by welding of a first resurfacing layer includes a corrosion-resistant metal alloy on the inside of the cavity. Surface machining of the first resurfacing layer is done to the internal diameter of the pipe. A liner made of corrosion-resistant steel alloy is introduced into the pipe. Deposition by welding includes at least one second resurfacing layer made of corrosion-resistant metal alloy on the inner wall of the pipe between the end of the liner in contact with the first machined resurfacing layer and the corresponding end of the pipe. Surface machining of the second resurfacing layer is done to the internal diameter of the pipe.

A device (20) for installing a tubular junction sleeve inside a pipe (1), having a mandrel (20a) of longitudinal axis (XX) supporting on its surface at least a first peripheral chamber (21) having a wall (21a) that is radially expandable by inflation. The first wall including at least one electrical connector (21b) suitable for being connected to one end of said heater wire. The connector being connected to an umbilical (24) including at least a compressed air feed duct for inflating the first chamber and an electrical power supply duct connected to the electrical connector. The device being characterized in that the mandrel supports on its outer surface a second peripheral chamber (22) having a wall (22a) that is radially expandable by inflation, and also a weld inspection device (23) arranged in the longitudinal direction of the mandrel.

The invention relates to a method for producing a number of pipes (100) with a predetermined pipe diameter. The method includes feeding multiple pipe parts (101, 102) with the predetermined pipe diameter to a welding station (53), aligning in each case a first pipe part (101) and a second pipe part (102) coaxially with respect to one another and axially adjacent to one another, welding the pipe parts (101, 102) by means of a fully encircling weld seam (109) to form a pipe run (104), conveying the pipe run (104) to a cutting station (57) in a machine direction (A) downstream of the welding station (53), and cutting off the number of pipes (100) in a respectively designated length from the pipe run (104).

An integrity monitoring system for a lined pipeline is provided for monitoring the integrity of a polymer liner in a host pipe. Methods and apparatus are described by which a lined pipeline is provided with such an integrity monitoring system. Sensor cable is able to bridge a joint between sections of lined pipe, for example by routing the sensor cable across the joint via a channel in an electrofusion fitting or by connecting successive lengths of sensor cable via pass-throughs in an electrofusion fitting. Advantageously, the sensor cable is disposed within a continuous annulus between linings and host pipes, and the continuous annulus is maintained across pipe joints using electrofusion fittings.

The invention in one aspect provides a joining sleeve configured to connect internal liners of two internally lined pipe sections across a welded pipe section joint and a method of use. The joining sleeve comprises a sleeve body having a first end and a second end, the first and second ends configured to couple with opposing ends of first and second internal liners respectively. A collar is disposed around the outer surface of the sleeve body, the collar having a first retracted condition in which it has a first outer diameter, and a second expanded condition in which it has a second outer diameter, larger than the first outer diameter.

The present patent application corresponds to an easy-to-manufacture device which eliminates all possible internal corrosion in the areas of welded joints of carbon steel pipes because it prevents damage to the inner coating during the welding process, increasing its useful live importantly.

The device consists of two parts that are welded in the workshop to the ends of each pipe. These parts have the same external diameter where the welded joint is done during the construction of the pipeline. The heat released in this process is dissipated by the device which prevents the temperature of the pipe wall from exceeding 120+/20 C., a condition that can withstand all types of coatings with paints designed for fluid pipelines.

Described in the present disclosure is corrosion-resistant piping (for example, for transportation of oil, natural gas, petrochemicals, water, wastewater, utilities, or the like) and low-cost methods for manufacturing and using the same. In certain embodiments, a corrosion-resistant cladding sparingly disposed specifically on and near the weld joint(s) of the piping provides an improved resistance to microbiologically induced corrosion. The targeted cladding prevents or reduces chemical and physical changes to the surface of the piping in the heat-affected zone near each weld joint. Without wishing to be bound to any particular theory, it is thought that the cladding prevents or reduces bacterial adhesion and subsequent MIC. In certain embodiments, the corrosion-resistant cladding described in the present disclosure may be manufactured at a significantly decreased cost compared to that of clad piping. The present disclosure provides various configurations of corrosion-resistant piping and methods for manufacturing and using the same.

The invention relates to the field of pipeline construction, and in particular to means of protecting an internal weld of pipelines with an internal anti-corrosion coating. The technical result of the invention is an increase in the durability of the device during its operation. The device for protecting the inner part of the welded seam of the pipeline is made as a sleeve having flared ends and has a coating of polymer material applied to its entire surface. Stops and a heat-insulating material are provided on the outer surface of the sleeve in a heat affected zone during welding. Rubber collars are provided at a distance of L1=L(0.15?0.2) from the ends of the sleeve, where L is the length of the sleeve. The rubber collars are configured to form a sealing bead.

A method for producing a steel underwater pipe for carrying a corrosive fluid, includes the successive steps: applying a layer of corrosion-resistant steel alloy on a terminal part of the internal wall of each pipe element from its end to be welded; the application of a plastic coating, on the internal wall of each pipe element; covering only a first part of the layer of metal alloy, a terminal part of the layer of metal ally on the side of the end to be welded of each pipe element not being covered by the plastic coating; the coaxial insertion and the crimping of a compression ring against the terminal part of the plastic coating; and the assembly by welding directly together the ends of two pipe elements by a corrosion-resistant steel alloy weld.