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. In the gap posted by the latch metal strip. The latch pull, metal tape expands and presses the pad to the inner surface area of the welded connection with precrition all internal coating of pipes. The invention allows to expand the Arsenal of technical means. 2 S. and 6 C.p. f-crystals, 6 ill.

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, KROHNE 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 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 their mate was absent snotrenna 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.

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 connections, which would allow their 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 with a polymeric binder strip, with the possibility of pressing the tape to the inner surface of the joint area with the estimated effort. When using this method, and it is not necessary V the joint area of the pipe after pipe joints by welding, introduction into the pipeline in this area is relatively difficult and only possible by free (neprimerenog) end of pipe. (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 from which of release operations in-line weld zone from the effects of the executed works. These are in-line operations as cutting and 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 of the pipes by welding to the inside of the pipe to the free (neprimerenog) end of pipe, complicates the process and increases costs.

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 fashion internal corrosion protection zone of welded pipe connections, 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 strip is a spring, in which the estimated amount of accumulated mechanical energy, are equipped with a locking element, the locking her from samorazvitiyu with deixarei, peripheral coils of metal spirally coiled tape is narrower, than pricewe coils of the tape, the peripheral coils of a tape made in the form of two branches by dividing the peripheral part of the tape on the specific length of the longitudinal groove, the peripheral coils of tape spatially fragmented with pricewise coils of tape, peripheral coils of tape across their width are equipped with insulating material, attached to the belt and having a specific length of the longitudinal groove, and pricewise coils of tape equipped with coiled impregnated polymer of the locking element, 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 pipes on the device with the provision of the gap between the ends of the pipes and the location of the ends of the retainer in the gap and partially outside of the pipes, perform the pressing strip of tape to the inner surface area of the pipe joint with a calculated effort by extracting the locking element through the gap between the ends of the pipes and occurring as a consequence of deixarei and 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 strip is a spring, in which the estimated amount of accumulated Electromechanical the peripheral port metal coils spirally coiled tape is narrower, than pricewe coils of the tape, the peripheral coils of tape spatially fragmented with pricewise coils of tape, peripheral coils of tape across their width are equipped with insulating material, attached to the belt and having a specific length of the longitudinal groove, and pricewise coils of tape equipped with coiled impregnated polymeric binder strip, tape, thermal insulation material and gasket have holes that have the locking element. Metal spirally coiled strip may be made of corrosion-resistant performance. The insulating material can have different performance and in the particular case may be in the form of fiberglass. Pricewe coils of tape equipped with coiled impregnated polymeric binder strip, impregnated with a polymeric binder material strip can be different and, in some cases, may be in the form of non-woven polyester material or fiberglass. In the performance of the heat insulating layer of the same material as the gasket material, impregnated polymeric binder, for example, of glass, heat insulating material and the gasket can be interconnected. The locking element moderations material, where in Fig.1 shows the device placed part of its length to the connection pipe welding in the inner cavity abutting the end of one of the pipes of Fig.2 - section a-a in Fig. 1; Fig.3 and 4 show, respectively, the nodes a and B in Fig.1; Fig.5 shows the position of the device in the cavity of the pipe joint to the point of extraction from the device retainer; Fig.6 shows a fragment of the pipe joint after removing retainer, samorazvitiyu tape and pressing her strip to the inner surface of the joint area.

The device comprises a sleeve made of metal spirally coiled tape 1, which is a spring, in which the estimated amount of accumulated mechanical energy, are equipped with a locking element 2, locking it from samorazvitiyu with deixarei by extracting the locking element 2. Peripheral coils 3 tape 1, the width of which is less than the width pricewhich turns 4 tape 1, come across their entire width of the insulating material 5 having a specific length of the longitudinal groove 13. Pricewe coils 4 tape 1 is equipped with coiled impregnated polymeric binder strip 6. Tape 1, a heat insulating material 5 and the spacer 6 are otrisovany coils 4 tape 1 and this form of tape 1 is stored to retrieve the locking element 2 of the holes 7 and only after the extraction of the spatial separation of the peripheral coils 3 tape 1 with pricewise coils 4 tape 1 is wound up. Fixing tape from samorazvitiyu the locking element 2 is installed in the holes 7 so that it can be extracted from them by pulling one of its ends in a direction close to radial. The width of the strip 6, which is equipped pricewe coils 4 tape 1, provides an overlap of the inner surface of the joint area without coverage, with partial capture internal coating of pipes.

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 8 having an inner coating 9. It relies outer peripheral coil, equipped with insulating material 5, on the inner surface of this pipe. Under unit design spatial separation pricewhich coils 4, equipped with a gasket 6, impregnated with a polymeric binder, with the peripheral coils 3 guarantees the distance between the inner surface of the pipe 8 and the polymer matrix which is impregnated strip 6, which is necessary to exclude the presence of a polymeric binder on the edge and near the adjacent area of the inner surface of the pipe 8 and the edge and CL is the moving of the pipe 10 to the device). Both ends of the locking element 2 is placed outside the pipe 8. Assemble the joint between the pipes 8 and 10 for welding with navigantium the end of the pipe 10 to the device using conventional techniques, equipment and fixtures such as pipe layers, outer clamp, etc. While providing a gap 12 between the ends of the pipe and both ends of the locking element 2 is placed in the gap 12 and partially outside of the tubes 8 and 10. Pull through the gap 12 of the locking element 2 of the holes 7 of the device by pulling one of its ends in a direction close to radial. Due to the extraction of the stopper element 2 of the holes 7 of the device is deixaria tape 1, while the spatial separation between field coils 3 tape 1 and pricewise coils 4 tape 1 is wound up, and the tape 1 at the expense of part of the mechanical energy accumulated in it, samorazvitiya. Left in the tape 1 in the estimated number of part accumulated in her mechanical energy provides the estimated contact force tape 1 strip 6, impregnated with a polymeric binder, to the inner surface area of the pipe joint. When samorazvitiya tape 1 is slippage and displacement of its orbits relative to the other the tape, equipped with a gasket 6 or insulating material 5. A longitudinal groove 13, available for a specific length of the heat insulating material 5 forms not covered by thermal insulating material 5 in the ring groove, contributing to the formation of the reverse roller weld in the implementation of the fusion of the edges of the pipes. Weld the ends of the pipes according to the traditional technology with advanced tack or no tack. A heat insulating material 5 having the necessary thermal resistance and heat resistance, eliminates invalid heat welding on heat-sensitive polymer binder and soaked them with the gasket 6. The estimated amount of force pressing the strip 1 strip 6 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 strip 6.

The required amount of mechanical energy that is left in the tape 1 after making it compress the strip 6 to the inner surface of the joint area, depends on the pipe diameter, the width of the strip 6, of its physico-mechanical properties and other characteristics, in accordance with which resitive, expanded working length and other parameters. Polymer binder, partially extruded from the strip 6, forms a protective cushions around the perimeter of the gasket, which further increases the reliability of the corrosion protection zone of welded joints of pipelines. The polymerization of the binder which is impregnated strip 6 may be carried out 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 needed to accelerate the 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. Tape thickness of 0.5 mm, the Width of the peripheral turns of tape 153 mm; width pricewhich turns of tape 240 mm Peripheral coils of tape across their width feature attached to the insulating material in the form of heat resistant glass with a thickness of 1 mm, with a specific length of the longitudinal groove width 10 mm Pricewe turns of tape are corrosion-resistant coating thickness of 0.5 mm is retannage polymeric binder based on epoxy enamel. The locking element is a segment of a steel strip of steel according to GOST 2284-79 section 10x2 mm Pipe, welded joint which protects made from welded steel pipes GOST 20295-85 having an inner corrosion-resistant coating based on epoxy enamel thickness of 0.5 mm over the entire length, but the ends of the pipes. Outer pipe diameter 219 mm, a wall thickness of 7 mm, an Outer transverse dimension of the peripheral coils spirally coiled ribbon of about 190 mm, the maximum outer transverse dimension pricewhich turns spirally coiled tape 150 mm total wall thickness of the obtained protective bandage depends on the number of turns and layers, folded spiral.

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 ostrowia mechanical energy, equipped with a locking element, the locking her from samorazvitiyu with deixarei, peripheral coils of metal spirally coiled tape is narrower than pricewe coils of the tape, the peripheral coils of a tape made in the form of two branches by dividing the peripheral part of the tape on the specific length of the longitudinal groove, the peripheral coils of tape spatially fragmented with pricewise coils of tape, peripheral coils of tape across their width are equipped with insulating material, attached to the belt and having a specific length of the longitudinal groove, and pricewise coils of tape equipped with coiled impregnated polymeric binder strip, tape, thermal insulation material and gasket have holes, have the locking element, 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 pipes on the device, ensuring a gap between the ends of the pipes and the location of the ends of the retainer in the gap and partially outside of the pipes, perform the pressing strip of tape to the inner surface area of the article is appropriate as a result of deixarei and samorazvitiyu tape through part accumulated in her mechanical energy, connect pipe welding.

2. Device for internal corrosion protection zone of welded pipe joints containing placed in the zone of the welded connection nut made of metal spirally coiled tape and spirally rolled impregnated polymeric binder strip can be pressed to the inner surface area of the pipe joint with an estimated force, characterized in that the metal spirally coiled strip is a spring, in which the estimated amount of accumulated mechanical energy, are equipped with a locking element, the locking her from samorazvitiyu with deixarei, peripheral coils of metal spirally coiled tape is narrower than pricewe coils of the tape, peripheral coils of tape spatially fragmented with pricewise coils of tape, peripheral coils of tape across their width are equipped with insulating material, attached to the belt and having a specific length of the longitudinal groove, and pricewise coils of tape equipped with coiled impregnated polymeric binder strip, tape, thermal insulation material and gasket have holes that have the snap in corrosion-resistant modification.

4. The device under item 2 or 3, characterized in that the peripheral coils of tape across their width feature attached to the belt and having the specific length of the longitudinal groove of the insulating material in the form of fiberglass.

5. The device according to p. 2, or 3, or 4, characterized in that the helically coiled impregnated polymeric binder strip made of non-woven polyester material.

6. The device according to p. 2, or 3, or 4, characterized in that spiralne rolled impregnated polymeric binder strip is made of fiberglass.

7. The device according to p. 4 or 6, characterized in that the helically coiled impregnated polymeric binder strip and a heat insulating material made of fiberglass and are interconnected.

8. The device according to p. 2, or 3, or 4, or 5, or p. 6, or 7, characterized in that the locking element is a segment of a metal strip of rectangular cross-section.

 

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