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 is folded spiral and fixed metal tape placed on the outer surface of the coiled and impregnated with a polymeric binder strip. Pull on the device, the second pipe, collect the junction with the provision of the estimated gap between the ends of the joined pipes. The gap is the latch metal strip. The latch pull, metal tape expands and presses the pad to the inner surface area of the welded connection with the overlapping ends of the inner cover tube. Expands the Arsenal of technical means. 2 ad and 3 C.p. f-crystals, 4 Il.

The invention relates to the field of manufacturing and installation of pipelines internal corrosion-resistant coating and can be used for corrosion protection of internal surfaces of the zones of welded joints in the manufacture of pipe sections of a pipe having an internal coating along the length, but the ends, when mo is Varna 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 10thinternational 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 placing the device in a protected area. The shape and dimensions of the outer surfaces of the ends of the sleeve and the inner surfaces of the pipe ends carry out so that when they mate, there were no significant zagruzki, transportation, unloading, warehousing, etc. and also due to the potential for significant random geometric errors of shape and size of the pipes, the inner surface of the pipe ends are calibrated. The degree of accuracy should be such, which ensures the interchangeability of the elements of the connection.

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 the cost.

It is desirable to have a method and apparatus for internal corrosion protection zone of welded pipe joints, allowing for its use to exclude the operation of calibrating the internal surfaces of the pipe ends and to simplify the method and to reduce costs.

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 the sleeve, in the form of metal spirally coiled tape and spirally rolled and impregnated polymeric see 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 to the inside of the pipeline in this area is relatively difficult and only possible by free (neprimerenog) end of pipe. (Patent RF №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 - nel 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 of pipes by welding, there is a need for preliminary operations to release line of the weld zone from the effects of the executed works. These are in-line operations such as: cutting, welding deburring, 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 need to perform operations that require the use of technical means entered after the connection pipe welding in the.

It is desirable to have a method and apparatus for internal corrosion protection zone of welded pipe joints in which the device is placed in the cavity abutting pipe ends to be joined by welding and to simplify the method and to reduce costs.

The problem is solved in that in the method of internal corrosion protection zone of welded pipe joints, which consists in placing in the zone of the weld and the adjacent portions of the inner protective cover device containing the sleeve, in the form of metal spirally coiled tape and spirally 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, the new is that in the device of metal spirally coiled tape is amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy with a flexible closed locking element, fixing her from samorazvitiyu with deixarei by breaking a flexible retainer, spacer made of insulating material, in certain areas of the impregnated polymeric binder is internal cavity abutting the end of one of the pipes, assemble the joint between the pipes for welding slipped on easily by the end of the other pipe on the protruding portion of the device with the provision of the gap between the ends of the pipes and the location of the closed ends of the flexible retainer element in this gap and partially outside of the pipe, shall crowded with an estimated effort of metal spirally coiled tape strip to the inner surface area of the pipe joint by breaking a flexible retainer element and its subsequent retrieval through the gap between the ends of the pipes and occurring as a consequence of deixarei and partial samorazvitiyu tape through part accumulated in her mechanical energy, connect pipe welding.

The problem is solved in that the device for internal corrosion protection zone of a welded joint of pipe containing the sleeve, in the form of metal spirally coiled tape and spirally 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, the new is that the metal spirally coiled tape is amarasiriwardena spring, in which the settlement amount is samorazvitiyu with deixarei by breaking a flexible locking element, the seal is made of insulating material, in certain zones impregnated with a polymeric binder and attached to a metal tape. Metal spirally coiled strip may 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. Flexible locking element may have a different material options and, in the particular case, may represent a segment of braided cord.

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 by the time of disconnection of the flexible retainer element and its subsequent retrieval; Fig.4 shows a pipe joint after disconnection and retrieval of the flexible element, partial samorazvitiyu tape and pressing her strip to the inner surface area of the pipe joint.

The device comprises a sleeve made of metal spirally coiled tape 1, representing amarasiriwardena toponym element 2, fixing her from samorazvitiyu with deixarei, the gasket 3 made of insulating material. Strip 3 only in certain zones 4 impregnated with a 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.

The method is as follows. The device is placed part of its length to the connection pipe welding in the inner cavity of spliced one end of the pipe 5, having an inner coating 7. The transverse size of the device is substantially smaller than the inner diameter of joined pipes 5 and 6, that allows to avoid when placing the device in the internal cavities of joined pipe ends hit 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). The closed ends of the flexible locking element 2 is placed outside the pipe 5. Assemble the joint between the pipes 5 and 6 for welding by navigavable, for example, pipelayers, outer clamp, etc. While providing a gap 9 between the ends of the tubes, the ends of the closed flexible locking element 2 is placed in the gap 9 and partially outside of the pipes 5 and 6. Unlock the flexible locking element 2 and pull it through the gap 9. When opening, the flexible locking element 2 is deficate and partial samorazvitiya tape 1 at the expense of part of the mechanical energy accumulated in it, while the inner surface of the ends of the joined pipes 5 and 6 limit samorazvitiya tape 1. Left in the tape 1 in the estimated number of part accumulated in her mechanical energy provides pressure with an estimated effort of the strip 3 to the inner surface area of the pipe joint. Weld the ends of the pipes 5 and 6 according to the traditional technology with advanced tack or no tack. 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 obespechit and prevent excessive extrusion of the polymeric binder of the zones 4 of the strip 3. The required amount of mechanical energy that is left in the belt 1 after the implementation of the pressing strip 3, depends on the pipe diameter, the width of the strip 3, its physical-mechanical properties and other characteristics, which are calculated the required properties and parameters of the tape 1, the axial moments of inertia of its cross-sections, working length, and other Polymeric binder, partially extruded from zones 4 of the strip 3, forms a protective cushions around the perimeter of the gasket, which further increases the reliability of internal corrosion protection of the weld zone. The polymerization of the binder, which is shown in zone 4 of the strip 3 may be implemented with external heating of the junction from an external source, but it can be carried without special heating based on the properties of polymeric binder. In addition, 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. Metal spirally coiled tape is made of cold spring complex steel strip according to GOST 2283-79 thickness of 0.5 mm and the seal is made from heat resistant fiberglass thickness is Metallichesky the ribbon. The metal tape has a corrosion-resistant coating based on epoxy resin with a thickness of 0.5 mm Flexible locking element is a braided cord with a diameter of 2 mm 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 of welded pipe joints, which consists in placing in the zone of the weld and the adjacent portions of the inner protective cover device containing the sleeve, in the form of metal spirally coiled tape and spirally rolled impregnated polymeric binder strip, with the possibility of pressing the tape to the inner surface area of the pipe joint with an estimated force, characterized in that the device of metal spirally coiled tape is amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy, Oia flexible locking element, the seal is made of insulating material, in certain zones impregnated with a polymeric binder and attached to a metal tape, the device is placed part of its length to the connection pipe welding in the inner cavity abutting the end of one of the pipes, assemble the joint between the pipes for welding with navigantium the end of the other pipe on the protruding portion of the device with the provision of the gap between the ends of the pipes and the location of the closed ends of the flexible retainer element in this gap and partially outside of the pipe, exercise is clamped with an estimated effort of metal spirally coiled tape strip to the inner surface area of the pipe joint by breaking a flexible retainer element and its subsequent retrieval through the gap between the ends of the pipes and occurring as a consequence of deixarei and partial samorazvitiyu tape through part accumulated in her mechanical energy, connect pipe welding.

2. Device for internal corrosion protection zone of a welded joint of pipe containing the sleeve, in the form of metal spirally coiled tape and spirally rolled impregnated polymeric binder strip with the possibility of the practical spirally coiled tape is amarasiriwardena spring, where the estimated amount of accumulated mechanical energy, equipped with a flexible locking element, the locking her from samorazvitiyu with deixarei by breaking a flexible retainer, spacer made of insulating material, in certain zones impregnated with a polymeric binder and attached to a metal tape.

3. The device according to p. 2, characterized in that the metal spirally coiled tape is made of corrosion-resistant performance.

4. The device under item 2 or 3, characterized in that the insulating material of the strip is a glass cloth.

5. The device under item 2 or 3, or 4, characterized in that the flexible locking element is a segment of braided cord.

 

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EFFECT: enhanced reliability of the pipeline.

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EFFECT: enhanced reliability.

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EFFECT: enhanced reliability.

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