The way internal corrosion protection zone of welded pipe connections and device for its implementation

 

The invention relates to the construction and used for the construction and operation of pipelines for corrosion protection of internal surfaces of welded joints of pipes. Before Assembly connected by welding to the inside of one of them enter the device containing the sleeve, made in the form of a coiled spiral belt, spiral collapsed, impregnated with a polymeric binder strip, with the possibility of pressing the tape to the inner surface area of the pipe joint with the estimated effort and training on the perimeters of the ends of the protective sleeve platens of the partially extruded from the strip, a polymeric binder, and an elastic membrane placed inside the coiled tape. Pull on the device, the second pipe, collect the junction with the provision of the estimated gap between the ends of the joined pipes. In the gap posted by articulated Assembly and locking knot. The latch removing the tape expands and presses the pad to the inner surface of the weld joint area. Expands the Arsenal of technical means. 2 S. and 4 C.p. f-crystals, 6 ill.

The invention relates to the field of manufacturing and installation of pipelines internal corrosion behavior in the manufacture of pipe sections from the pipe, having an internal coating along the length, but the ends, when mounting the trunk, field and other pipelines intended for transportation of crude oil, produced water, gas, oil, water and other environments of the pipe sections or individual tubes.

The known method and device for internal corrosion protection zone of a welded joint of pipe having an internal corrosion-resistant coating on its entire length, but the ends of the pipes developed by the company "Tuboscope Vetco International (USA), which was shown at the 10th international exhibition "Oil and gas" in Moscow in June 2001 (see promotional material company "Tuboscope Vetco International"). The device includes a metal sleeve, an exterior grooves in its ends is placed an o-ring. In the Central part of the sleeve on its outer surface a groove in which is placed a heat insulating material. Before installing the unit into the internal cavity of the ends of adjacent pipes on the inner surface of the ends of these pipes is applied sealant. The device is set in the internal cavities of joined pipe ends during Assembly of the joint for welding to pipe joints by welding, which simplifies the operation of the host device to protect lnewt so, so that when they mate, there were no significant gap, therefore, subject to regulatory permissible deviations of the sizes and shapes of pipes, and also due to the potential for significant random geometric errors of the form and dimensions of pipes, acquired in the process of loading, transporting, unloading, warehousing and other inner surface of the ends of the tubes are calibrated. The degree of accuracy should be such, which ensures the interchangeability of the elements of the connection. During installation of the device, the excess sealant composition is extruded and moves the sealing rings to the ends of the sleeve with the formation at the perimeters of the end faces of the protective cushions.

The need to perform calibration of the internal surface of the pipe ends complicates the conditions of use of the method and of the device and increases costs, and formed a protective cushions have an arbitrary unstable shape and size, which determines the increased hydraulic resistance of the pipe joint, the protected device, the motion of the transported fluid through the pipeline.

It is desirable to have a method and apparatus for internal corrosion protection zone of welded pipe joints, allows the astiti way and reduce costs, and also to give a protective rollers certain stable shape and size, providing a reduced hydraulic resistance of the transported fluid through the pipeline.

The known method and device for internal corrosion protection zone of a welded joint of pipe having an internal corrosion-resistant coating on its entire length, but the ends of the pipes, which consists in placing upon connection pipe welding in the weld seam area and the adjacent portions of the inner protective cover device containing a sleeve, made in the form of a coiled spiral belt, spiral collapsed and impregnated with a polymeric binder strip, with the possibility of pressing the tape to the inner surface of the joint area with a calculated effort to inflate the elastic membrane placed inside a spirally coiled tape. After pressing the excess polymeric binder, extruded from the strip, forming the perimeters of the ends of the sleeve protective cushions. When using this method, and it is not necessary to perform calibration of the internal surfaces of the pipe ends. Due to the fact that the device is placed in the zone of the joint between the pipes after connection pipe welding introduction walnut ruby (RF patent 2133908, CL F 16 L 58/02, the application 97117309/06 from 16.10.97, published 27.07.99, authors: Moiseenko C. A., Swedes Century, the Swedes Century. N. Patentee: Scientific-production Association "Tris").

This method and the device closest to the claimed combination of essential features and is used as a prototype for method and device.

When using this method and device operation by placing the device inside a pipeline by injecting it with hand free (neprimerenog) end of the pipe causes the need for in-line operation delivery devices of free (neprimerenog) end of the pipe to the zone of the weld. When using the standard pipe length delivery device is a few meters, and using the usual two - techtronic sections - a few tens of meters, so to perform this operation requires appropriate transport module or other means of delivery. In addition, when using this method and device due to the placement of the device in the zone of the joint between the pipes after connection pipe welding occurs the necessity of preliminary operations to liberate vnutritrubnoj weld spatter, cleaning dirt from the products generated in the welding process, the removal of the products cutting and cleaning. To perform these in-line water treatment operations also require appropriate technical means which are injected into the pipeline in the weld seam area side free (neprimerenog) end of pipe. In the case of placing the device in the zone of the weld after connecting pipe welding without pre-execution in-line water treatment operations reduces the quality and reliability of corrosion protection zone of a welded joint, and in the presence of increased weld spatter the possibility of using this method and the device becomes problematic. The shape and size of the above-mentioned protective ridges formed along the perimeters of the ends of the sleeve, arbitrary and unstable.

The need to perform operations that require the use of technical means entered after the connection of the pipes by welding to the inside of the pipe to the free (neprimerenog) end of pipe, complicates the process and increases costs, and arbitrary unstable shape and size formed by protective cushions predetermine increased hydraulic fight is about to have a method and apparatus for internal corrosion protection zone of welded pipe connections, allowing when it is used to place the device in the cavity abutting pipe ends to be joined by welding and to simplify the method and to reduce costs, and make protective rollers certain stable shape and size, providing a reduced hydraulic resistance of the transported fluid through the pipeline.

The problem is solved in that in the method of internal corrosion protection zone of welded pipe joints, which consists in placing in the area of the pipe joint and the adjacent portions of the inner protective cover device containing a sleeve, made in the form of a coiled spiral belt, spiral collapsed, impregnated with a polymeric binder strip, with the possibility of pressing the tape to the inner surface area of the pipe joint with the estimated effort and training on the perimeters of the ends of the protective sleeve platens of the partially extruded from the strip, a polymeric binder, and an elastic membrane placed inside a spirally coiled tape, new, in the device, the flexible membrane is a camera, the outer surface of which has no adhesion to polymeric binder, pre-inflated the chickpeas position by means of articulated closed canopy Assembly retainer node, with the possibility of reducing the degree of compression of the elastic membrane due to its expansion in the transverse direction after breaking articulated Assembly of the stopper knot, elastic sheath has a length exceeding the length of the bushing part of it protruding from two sides of the sleeve, made with the possibility of forming their protective cushions, shape and dimensions are defined, stable, and provide a reduced hydraulic resistance, the seal is made of insulating material, in certain areas in the estimated amount of impregnated polymeric binder and attached to the ribbon, before joining pipes by welding at the abutting end of one of the pipes set articulated closed Assembly and locking knot that secures the sleeve from deployment and the degree of compression sleeve elastic shell, and the sleeve is part of its length and is centered in the inner cavity abutting the end of one of the pipes, assemble the joint between the pipes for welding by slipped on easily spliced end of the other pipe on the protruding portion of the device to form between the ends of the pipes gap, minimum value of which is regulated articulated with the Assembly and retaining the temporal expression part of the polymeric binder of the strip and forming thus protruding from the bushing parts elastic shell protective cushions certain stable shape and size on the perimeter ends of the sleeve by breaking articulated Assembly and locking of the site and its subsequent removal from the zone of the joint between the pipes and occur as a result of this lateral expansion of the elastic membrane and partial deployment of the tape under the action of excess pressure of the working medium in the elastic shell, connect pipe welding, perform the polymerization of the binder, remove the elastic shell.

The problem is solved in that the device for internal corrosion protection zone of welded pipe joints containing sleeve, made in the form of a coiled spiral belt, spiral collapsed, impregnated with a polymeric binder strip, with the possibility of pressing the tape to the inner surface area of the pipe joint with the estimated effort and training on the perimeters of the ends of the protective sleeve platens of the partially extruded from a strip of a polymeric binder, elastic membrane placed inside a spirally coiled tape, what's new is that the elastic membrane is a camera, the outer surface of which has no adhesion to polymeric binder, pre-stretched working environment under pressure and compressed outside spirally coiled ribbon held in collapsed position by means of articulated closed canopy Assembly and locking of the site, with the possibility of reducing the degree of compression of the elastic membrane due to its expansion in the transverse direction after breaking articulated Assembly retainer node, is received with the possibility of forming their protective rollers, shape and dimensions are defined, stable, and provide a reduced hydraulic resistance, the seal is made of insulating material, in certain areas, in the estimated amount of impregnated polymeric binder and attached to the ribbon. Coiled helical ribbon can be amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy. Coiled spiral tape can be made of corrosion-resistant performance. The insulating material of the gasket may have different performance and, in the particular case, may be in the form of fiberglass. Articulated Assembly and the locking Assembly can be made in the form of ticks.

The invention is illustrated by the graphic material, where Fig.1 shows the device placed part of its length in the inner cavity abutting the end of one of the pipes of Fig.2 - section a-a in Fig.1; Fig.3 shows the position of the device in the cavity of the pipe joint to the point of breaking articulated Assembly and locking of the site and its subsequent removal; Fig. 4 shows the articulated Assembly and the locking node after its opening in the joint area of Fig.5 p the deployment ribbon, pressing her strip to the inner surface area of the pipe joint and the formation of the protruding parts of the elastic shell protective rollers; Fig.6 presents a zone of welded pipe connections after polymerization of the binder and extract the elastic shell.

The device comprises a sleeve, made in the form of a spirally coiled tape 1, placed inside the sleeve elastic membrane 15, articulated closed Assembly and the locking node 2, spirally rolled strip 3 made of insulating material. Strip 3 only in certain zones 4 impregnated in the estimated amount of polymeric binder. The width of the strip 3 and the size of its zones 4, impregnated with a polymeric binder, provide overlap of the inner surface area of the joint between the pipes 5 and 6, do not have internal coatings 7 and 8, with partial capture of these coatings. Articulated Assembly and locking the node 2 includes a bracket-arm 11, the bracket-arm 12, the hinge 13 and the lock 14. Between the ends of the pipes 5 and 6 there is a gap 9. The length of the elastic membrane 15 is greater than the length of the sleeve and has speakers on both sides of the sleeve part 16 made with the possibility of forming their protective rollers 10 of the desired shape and size of polymer light. arnino dump closed Assembly and the locking node 2 with fixed them from the deployment sleeve, jaws elastic membrane 15, mounted on the end of one of the joined pipe 5 having an inner coating 7. Based on the outer surface of the pipe end 5, articulated closed Assembly and the locking node 2 centers sleeve disposed part of its length in the inner cavity abutting the end of the pipe 5. The transverse dimension of the tube with the gasket 3 and the protruding parts 16 pre objetos shell 15 is substantially smaller than the inner diameter of joined pipes 5 and 6, that allows to avoid a polymeric binder of the zones 4 of the strip 3 on the edge and near the adjacent area of the inner surface of the pipe 5 and the edge and near the adjacent area of the inner surface of the pipe end 6 (subsequent nadhani pipe 6 to the device). Assemble the joint between the pipes 5 and 6 for welding slipped on easily by the end of the pipe 6 on the protruding portion of the device with the provision of the gap 9. Unlock articulated sochinenii Assembly and the locking node 2 using the lock 14, attach the bracket to the lever 11 and the bracket-arm 12 angular movement around the hinge 13 and remove the articulated mounting-stopper who defecate tape 1, the expansion in the transverse direction of the elastic membrane 15 and the partial deployment of the tape 1 by the excess pressure in the expanding elastic casing 15, while the inner surface of the ends of the joined pipes 5 and 6 restrict the deployment of the tape 1 and the extension of the protrusions 16 of the membrane 15. Remaining in the estimated amount of excess pressure in the elastic membrane 15 provides pressure with an estimated effort of the strip 3 to the inner surface area of the pipe joint. Produce, if necessary, adjustment of the gap 9 by axial mixing one of the joined pipes. Polymer binder, partially extruded from zones 4 of the strip 3, fills the cavity formed by protruding parts 16 of the shell 15, the inner surfaces of the tubes and the ends of the sleeve, and forms the perimeter ends of the protective sleeve rollers 10, which further increases the reliability of internal corrosion protection of the weld zone, and the shape and dimensions of the protective rollers 10 defined, stable, and provide a reduced hydraulic resistance of the transported fluid through the pipeline. Weld the ends of the pipes 5 and 6 according to the traditional technology with advanced tack or Sposobov, for example, when cleaning the internal surface of pipelines. Not impregnated polymeric binder areas of the strip 3 made of insulating material having the required thermal resistance and heat resistance, exclude invalid heat welding on heat-sensitive polymer binder which is impregnated zone 4 of the strip 3. The estimated amount of force pressing the strip 1 strip 3 provides the necessary degree of sealing zone of a welded joint of pipe from the pumped on it product and prevent excessive extrusion of the polymeric binder of the zones 4 of the strip 3. The desired residual excessive pressure of the working medium in the elastic membrane 15, which takes place after the implementation of its clamping strip 3, depends on the pipe diameter, the width of the strip 3, its physical-mechanical properties and other characteristics, which are calculated source of excessive pressure of the working medium in the elastic membrane 15, the required properties and parameters of the tape 1, the axial moments of inertia of its cross-sections, working length and other Polymerization of the binder, which is shown in zone 4 of the strip 3 may be implemented with external heating of the junction from Roma, a certain amount of heat required for polymerization of the binder may be pre-stored in the body.

An example of a specific implementation of the device. Coiled spiral tape is a metal tape according to GOST 2283-79 thickness of 0.5 mm, an Elastic membrane made of a polymer film, the outer surface of which has no adhesion to the polymeric binder. The seal is made of heat resistant glass thickness of 3 mm, in certain areas of the impregnated polymer binder based on epoxy resin and attached to a metal tape. The tape has a corrosion-resistant coating based on epoxy resin with a thickness of 0.5 mm Articulated sochinenii Assembly and the locking unit is designed in the form of ticks. Tubing, welded joint which protects made from welded steel pipes according to GOST 20295-85 having an inner corrosion-resistant coating based on epoxy resin over the entire length, but the ends of the pipes. The outer diameter 219 mm, a wall thickness of 7 mm, an Outer transverse dimension of the device at 180 mm, length 240 mm

Claims

1. The way internal corrosion protection zone sworn the first coating device, contains sleeve, made in the form of a coiled spiral belt, spiral rolled impregnated polymeric binder strip, with the possibility of pressing the tape to the inner surface area of the pipe joint with the estimated effort and training on the perimeters of the ends of the protective sleeve platens of the partially extruded from a strip of a polymeric binder, and an elastic membrane placed inside a spirally coiled tape, characterized in that the elastic device shell is a camera, the outer surface of which has no adhesion to polymeric binder, pre-stretched working environment under pressure and compressed outside spirally coiled tape, held in collapsed position by means of articulated closed canopy Assembly and locking of the site, with the possibility of reducing the degree of compression of the elastic membrane due to its expansion in the transverse direction after breaking articulated Assembly of the stopper knot, elastic sheath has a length exceeding the length of the bushing part of it protruding from two sides of the sleeve, made with the possibility of forming their protective cushions, shape and dimensions are defined, p is the material, in certain areas, in the estimated amount of impregnated polymeric binder and attached to the ribbon, to the connection pipe welding abutting the end of one of the pipes set articulated closed Assembly and locking knot that secures the sleeve from deployment, and the degree of compression sleeve elastic shell, and the sleeve is part of its length and is centered in the inner cavity abutting the end of one of the pipes, assemble the joint between the pipes for welding by slipped on easily spliced end of the other pipe on the protruding portion of the device to form between the ends of the pipes gap, minimum value of which is regulated articulated with the Assembly and locking site, maintain pressure with an estimated effort of the strip to the inner surface area of the pipe joint with the simultaneous extrusion of part of the polymeric binder of the strip and forming thus protruding from the bushing parts elastic shell protective cushions certain stable shape and size on the perimeter ends of the sleeve by breaking articulated Assembly and locking of the site and its subsequent removal from the zone of the joint between the pipes and occur as a result of this transverse rarely in an elastic shell, connect pipe welding, perform the polymerization of the binder, remove the elastic shell.

2. Device for internal corrosion protection zone of welded pipe joints containing sleeve, made in the form of a coiled spiral belt, spiral rolled impregnated polymeric binder strip, with the possibility of pressing the tape to the inner surface area of the pipe joint with the estimated effort and training on the perimeters of the ends of the protective sleeve platens of the partially extruded from a strip of a polymeric binder, elastic membrane placed inside a spirally coiled tape, characterized in that the elastic membrane is a camera, the outer surface of which has no adhesion to polymeric binder, pre-stretched working environment under pressure and compressed outside spirally coiled ribbon held in collapsed position by means of articulated closed canopy Assembly and locking of the site, with the possibility of reducing the degree of compression of the elastic membrane due to its expansion in the transverse direction after breaking articulated Assembly of the stopper knot, elastic sheath has a length, previsite rollers, shape and dimensions are defined, stable, and provide a reduced hydraulic resistance, the seal is made of insulating material, in certain areas, in the estimated amount of impregnated polymeric binder and attached to the ribbon.

3. The device according to p. 2, characterized in that the spirally coiled tape is amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy.

4. The device under item 2 or 3, characterized in that the spirally coiled tape is made of corrosion-resistant performance.

5. The device according to p. 2, or 3, or 4, characterized in that the insulating material of the strip is a glass cloth.

6. The device according to p. 2, or 3, or 4, or 5, characterized in that the articulated Assembly and the locking unit is designed in the form of ticks.

 

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