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 the Assembly is connected by welding to the inside of one of them enter the sleeve is rolled spirally and recorded tape placed on the outer surface of the annular insulating material. At the ends of the sleeve are placed annular layers of sealing material. 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 release of the tape. The latch removing the tape expands and is pressed against the inner surface of the weld joint area overlapping the ends of the inner cover tube and the sealing zone of the weld. Expands the Arsenal of technical means. 2 S. and 3 C.p. f-crystals, 5 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, crane 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 (RF patent 2080510, CL F 16 L 13/02, the application 95108103/06 from 18.05.95, published 27.05.97, Authors: Cossacks C. A. , Kolesne S. C., Syntin E. P., Canasuc N. And.). The device comprises a hard metal sleeve, the grooves of which outside 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 welding joint to connect the pipes by welding. To obtain the corrosion protection of an acceptable quality when using this device and method, however, requires, on the one hand, the external diameter of the device would always be smaller than the inner diameter of joined pipes, and on the other, so that when this form of standard pipes are that does not guarantee the fulfillment of the conditions specified above. In addition, if we consider that there can be substantial random geometric errors of shape and size of the pipe ends, acquired in the process of loading, transporting, unloading, warehousing, and others, the possibility of effective use of the method becomes problematic.

It is desirable to have a method and apparatus to compensate for deviations of the geometrical sizes and shapes of the inner surfaces of the ends of the joined pipes.

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 comprises a hard metal sleeve, the grooves of which outside 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 formed in the form of an annular belt. Before installing your internal is. The device is set in the internal cavities of joined pipe ends during Assembly of the welding joint to connect the pipes by welding. 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 would place the required gap. To this end, taking into account the above possible deviations of the sizes and shapes of pipes, the inner surface of the ends of all the tubes are calibrated. The degree of accuracy should be such, which ensures the interchangeability of the elements of the connection.

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

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 to compensate for deviations of the geometrical sizes and shapes of the inner surfaces of the ends of the joined pipe and to exclude the operation of the calibration, making it easier this way and reducing costs.

Postavlennaya in accommodation in the area of the pipe joint and the adjacent portions of the inner protective cover device, contains sleeve and a heat insulating material formed in the form of an annular zone that is hosted on its external surface in the Central part, what's new is that in the device the sleeve is made in the form of a coiled ribbon, equipped with a sealing composition, representing amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy that is temporarily covered by articulated with the Assembly and locking knot that secures it from samorazvitiyu with deixarei by breaking articulated Assembly and locking of the site and its subsequent removal, and formed in the form of an annular zone heat insulating material is made stretchable, before joining pipes by welding at the abutting end of one of the pipes set articulated closed Assembly and the locking node covering sleeve and locking it from samorazvitiyu, when this 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, Westlaw pressure with an estimated force of coiled tape, equipped with a sealing composition to the inner surface area of the pipe joint by breaking articulated Assembly and locking of the site and its subsequent removal from the zone of the joint between 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 welded pipe joints containing sleeve and a heat insulating material formed in the form of an annular zone that is hosted on its external surface in the Central part, it is new that the sleeve is made in the form of a coiled ribbon, equipped with a sealing composition, representing amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy that is temporarily covered by articulated with the Assembly and locking knot, fixing her from samorazvitiyu with deixarei by breaking articulated Assembly and locking of the site and its subsequent removal, and formed in the form of an annular zone heat insulating material made rastapopolous material may be fiberglass appropriate weave. 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 shows a pipe joint after disconnection and removal of the articulated Assembly of the stopper node and pressing the tape, are equipped with a sealing composition to the inner surface area of the pipe joint.

The device comprises a sleeve, made in the form of coiled tape 1, equipped with a sealing composition 4 and representing amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy that is temporarily covered by articulated with the Assembly and locking node 2, locking it from samorazvitiyu with deixarei and subsequent removal, and heat insulating material 3. The width of youdim composition 4, from heat during welding of the pipe joint. 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. Sealant 3, partially extruded in partial samorazvitiya coiled tape 1, forms a protective cushions 10.

The method is as follows. Articulated closed Assembly and the locking node 2 with fixed them from samorazvitiyu sleeve 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, equipped with a sealing composition 4 and the insulating material 3, is substantially less than the internal diameter of joined pipes 5 and 6, that allows to avoid sealing compound 4 as an edge and near the adjacent area of the inner surface of the pipe end 5 and the edge and near the adjacent area of the inner surface of the pipe end 6 (subsequent nadhani pipe 6 to eliminate the CTB with the provision of the gap 9, the value of which is regulated by the brackets-levers 11 and 12 of the articulated Assembly of the stopper node 2. Unlock articulated sochinenii Assembly and the locking node 2 using the lock 14, attach the bracket to rachau 11 and the bracket-arm 12 angular movement around the hinge 13 and remove the articulated Assembly and the locking node 2 from the zone of the joint between the pipes 5 and 6. When opened, the hinge-sochinenia Assembly retainer node 2 is deficate and partial samorazvitiya tape 1 at the expense of part of the mechanical energy accumulated in it, and stretch the ring belt of the heat insulating material 3, while the inner surface of the ends of the joined pipes 5 and 6 limit samorazvitiya tape 1. Remaining in the tape 1, equipped with a sealing composition 4, the estimated number of part accumulated in her mechanical energy provides its pressure with the calculated force to the inner surface area of the pipe joint. Produce, if necessary, adjustment of the gap 9 by an axial displacement of one of the joined pipes. Weld the ends of the pipes 5 and 6 according to the traditional technology with advanced tack or no tack. A heat insulating material 3 has the required thermal resistance is eitherwise part 4, which is equipped with a tape 1. The estimated effort of the pressing belt 1 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 sealing compound 4. The required amount of mechanical energy that is left in the tape 1 after receiving its pressure depends on the diameter of the pipeline, physico-mechanical properties of the sealing composition and a heat insulating material, and other characteristics, which are calculated the required properties and parameters of the tape 1, the axial moment of inertia of its cross section working length and other Partially extruded in the process of partial deployment ribbon 1 sealant 4 forms a protective rollers 10 around the perimeter of the folded tape 1, which further increases the reliability of internal corrosion protection of the weld zone. Thus, the execution of the sleeve in the form of a coiled ribbon, equipped with a sealing composition and representing amarasiriwardena spring, considering the fact that the limiting factor of samorazvitiyu every time is the specific surface of the ends of the joined pipe, having concrete is and every time I get the desired pair in the system "sleeve - the ends of the pipes". Curing the sealing composition 4 can be carried out with external heating of the pipe joint from an external source, but it can be carried without special heating based on the properties of the sealing composition. In addition, a certain amount of heat required for curing the sealing composition may be previously accumulated 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, a heat Insulating material is a heat resistant stretchable glass thickness of 3 mm are formed in the form of an annular belt. As the sealing compound is used thixotropic (nesteia) epoxy mastic. The metal tape has a corrosion-resistant utverjdenie 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, Kreta about 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 sleeve and a heat insulating material formed in the form of an annular zone that is hosted on its external surface in the Central part, characterized in that the device sleeve is made in the form of a coiled ribbon, equipped with a sealing composition, representing amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy that is temporarily covered by articulated with the Assembly and locking knot, fixing her from samorazvitiyu with deixarei by breaking articulated Assembly and locking of the site and its subsequent removal, and formed in the form of an annular zone heat insulating material is made stretchable, before joining pipes by welding at the abutting end of one of the pipes set articulated closed Assembly and the locking node covering sleeve and locking it from samorazvitiyu, and the bushing Assembly of the pipe joint 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 force of coiled tape, equipped with a sealing composition to the inner surface area of the pipe joint by breaking articulated Assembly and locking of the site and its subsequent removal from the zone of the joint between 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 welded pipe joints containing sleeve and a heat insulating material formed in the form of an annular zone that is hosted on its external surface in the Central part, wherein the sleeve is made in the form of a coiled ribbon, equipped with a sealing composition, representing amarasiriwardena spring, in which the estimated amount of accumulated mechanical energy that is temporarily covered by articulated with the Assembly and locking knot that secures it from samorazvitiyu with deixarei by breaking articulated mon material is made stretchable.

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

4. The device under item 2 or 3, characterized in that the stretchable insulating material is fiberglass appropriate weave.

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

 

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