The method of cleaning of pipelines, the method of coating pipes and devices (options) for their implementation
(57) Abstract:The invention relates to construction and is used in the construction and repair of pipelines. The pipeline move the treatment device on the periphery of which form a liquid jet, with the latter affected by electro-hydraulic or pneumatic-hydraulic punches. Cleaning products mixed with mortar and after application to the internal surface of the pipeline in the solution is pressed against the mesh sleeve. Recommendations on technological regimes and the choice of materials. Improves the reliability of the pipeline through the application of robust and resilient coating. 8 C. and 15 C.p. f-crystals, 10 ill. The technical field
The invention relates to pipeline transport, namely the restoration of the destroyed corrosion of piping systems and to the construction of new pipelines.Art
A known method of cleaning pipelines from deposits, namely, that the pipeline pressure fluid move Trubodetal device, the fluid flow through the treatment device in the form of jets which remove deposits from the inner surface of the pipe, is not effectively cleans the coal slurry pipeline, for example, from these sediments, as phosphogypsum.The closest prototype is the best way to clean the pipelines, including the move by pipeline to a water treatment device, forming them on the periphery of the device of the jets of fluid removal from the pipe wall deposits and take away their flow of fluid from the pipeline, A. C. the USSR 995910 08 In 9/04, E 03 F 3/00, 1983The disadvantage of this method is that it is not very effective for the treatment of solid deposits type of phosphogypsum or barium salts.The known device for carrying out the method, for example, A. C. the USSR In 8 In 9/04 995910, 1983, A. C. the USSR In 8 In 9/04 1744844, 1988, A. C. the USSR In 8 In 9/04 1688503, 1989, A. C. the USSR In 08 In 9/04 1744844, 1988, the Disadvantage of these devices is that they are not very effectively clean the piping from very solid deposits.The closest prototype is the device according to A. C. of the USSR In 8 In 9/04 995910, 1983There is a method of coating the internal surface of the pipeline when the pipeline move the covering composition, and they cover the surface of the pipeline, for example, A. USSR 1041179 22 F 7/04, 1981 or WO 86/02425 A1, 24.04.1986,The disadvantage of these methods is that they work well with edges is their separation.The known device for coating the internal surface of the pipeline, consisting of a fluid supply system agent, the mechanism of coating, for example, EPO patent 0082212 class. F 16 L 55/16, 1981 A. 730379, CL In 05 With 7/08, 1980, patent RU 20157465 IN 05 WITH 7/08, 1992, patent RU 2015742, 5 IN 05 WITH 1/08, 1992, A. C. the USSR 1512682 CL In 05 With 1/08, 1989, A. C. the USSR 1445810, CL In 05 With 1/8, 1988The disadvantage of these devices is that they are not very effective when applied cement-sand mixture.The closest prototype is the device according to EN 2015742 C1, B 05 C 1/08, 1994A disadvantage of this device is that it is not very effective when applied cement-sand mixture.The invention
The objective of the invention is to provide opportunities coatings of pipelines cement-sand mixtures and increasing the length of the covered pipeline segment.The second object of the invention is to improve the quality and strength of the coating.A third object of the invention is to create a resilient coating, operating at temperatures from +5-180oC.The task is solved by the fact that at the optimum pressure in the pipeline cosdecs is in the pipeline. The maximum number of cavitary occurs in the range of the number of evenly spaced jets 9-36, since the number of streams is less than 9 is not an cavitate on the entire surface of the circumference of the pipe. When the number of jets over 36 a number of cavitary decreases. When pressure in the pipe begins to develop vortex flow pressure, which pulls cavitation from the pipe wall. Cavitation in this case does not produce cleaning of the pipeline from deposits. Increasing pressure agent increases the number of accidents in the pipeline.The influence of electro-hydraulic impact on the formation of the jet increases the mechanical suspension in the fluid flow, which increases the number of cavitary, in addition to three orders of magnitude increases the speed of the jets.The implementation of electric discharge between the cuffs or before the first on-the-go cleaning the cuff caused by the presence of reflected waves and provides shock wave.Removing deposits from the pipe wall, crushing and mixing improves the adhesion of the pipeline, and also improves the quality of the solution and increases its durability.The increase in pressure of the solution reduces the number of pores in the coating, which increases strongly is 2">The use of two sleeves at the indentation of the cover, which is installed coaxially, while the outer sleeve has a thinner structure netting sleeves, the inner sleeve. This allows you to get a higher pyramid post coating that provides superior adhesion of the coating to the sleeve.Re-applying a layer of adhesive allows you to increase the coating thickness.Removing the second sleeve of the pipeline reduces the flow of polymer (sleeves).The number of petals in the range 9-36 allows you to increase the number of cavitary and increase the speed of treatment.Bond hubs rods between themselves and the establishment between the electrode allows additional devices to produce discharges in different sections of the pipeline diameter, which increases the specific energy of impact, and therefore speeds up the cleaning process.The implementation of cuffs from a single drive, you can increase the unit pressure of the impact, and improve treatment quality and execution of grooves on the periphery of the disks allows you to increase the speed of the jets and accelerates the speed of treatment.The device for coating of cleaning, covering and smoothing IU is the substance of the solution.The formation of holes for the passage of gas in smoothing mechanism can dramatically reduce the fluidity of the solution deposited on the pipe wall, due to ejection of the flowing gas, and prevents the formation of hills before smoothing device.The execution of the pneumatic device of perekachivayuschih sleeve allows 10,000 times to increase the volume of gas than in the known pneumopathy, also improves the tightness of the unit.The implementation of the holes in the sleeve allows you to simplify the management hydropercussion machine.The use of a sling and a flexible connection allows you to accelerate the release of air from the sleeve and to increase the force of impact.The execution mechanism of indentation of the Torah allows you to increase the unit pressure pushing the sleeve into the solution without significantly increasing the gas pressure in the pipeline.Supply device moving warehouse sleeve reduces friction sleeve, and consequently, to increase the length of coverage.Installation in the pipeline receiver allows the floor with the increasing speed of the coating, which ensures an increase in the height of the filling in the cavity of the pipeline before mechanismo"ptx2">Cover the pipe with increasing speed allows two to five times lower fluidity applied to the pipeline coating.List of drawings
In Fig.1 shows a treatment device.In Fig.2 shows the device with the electrode.In Fig. 3 shows a device for cleaning of pipelines with pneumoelectroservice.In Fig.4 shows pneumohydraulic with an opening end of the sleeve.In Fig.5 shows a device for coating pipe,
In Fig.6 shows a device for pushing the sleeve into the solution.In Fig. 7 shows a device for coating pipe with moving stock sleeves.In Fig.8 shows a device for coating system gas accumulation.In Fig. 9 shows the covering device of the elastic petals or cones.In Fig. 10 depicts the covering device of the elastic cones or petals and tori mounted on the shaft.Information confirming the possibility of carrying out the invention
Cleaned pipe 500 mm from deposits of phosphogypsum.Pipe length 450 mm, the Thickness of the deposits 80 mm, which was equal to 8. For pipeline created the water pressure is 1.6 MPa. Trubochista the cleaning device is not produced.Then set trubochista device with nine petals in each row.At a pressure of 1.6 MPa trubochista the device began to move through the pipeline 7 m/h.In the pipeline is installed trubochista device with 15 petals. At a pressure of 1.6 MPa trubochista the device is moved through the pipeline with a speed of 0.3 km/h. After that, the pipeline was installed trubochista device 36 petals in each row.When the pressure is 1.6 MPa, trubochista the device is moved through the pipeline at a speed of 12 m/h.In the pipeline is installed trubochista device 37 petals in each row. At a pressure of 1.6 MPa trubochista device is moved with a speed of 9 m/h.As a result of numerous experiments after purification over 240,000 km of pipelines for various purposes and diameters was found the optimum number of blades in each row 12-15.A sharp decrease in purification at 8 and 37 petals in each row.Purified similar pipeline cleaning device We repeated the experiment, but additionally between the cuffs produced a discharge voltage of 50 kV with a frequency of 3 Hz, the cumulative capacity of the station was 3 microfarad.Device when the water pressure is 1.6 MPa, clean the pipe with a speed of 3 km/h.The device used is shown in Fig. 2.Purified similar to the pipeline device shown in Fig. 3. The number of blades in the device is equal to 15. The water pressure in the pipeline was equal to 1.6 MPa.For robocity device in the pipeline introduced sleeve with a diameter of 450 mm and a length of 80 mm With a frequency of 0.2 Hz sleeve filled with air under pressure, equal to 1.8 MPa, and through the open end thereof produced in the pipeline.The cleaning rate was 5 km/h.Example
After cleaning, the pipe was covered with a cement-sand mixture. The implementation of the method was performed with the device shown in Fig.5.Prepared cement-sand mixture of the following composition, in weight parts:
Cement (Portland cement 500) - 1 hQuartz sand - 2 hoursPVA glue - 0,03 hWater / cement ratio W/C - 4
Set the device in the pipe is compressed air under a pressure of 0.6 MPa.Opened the latch receiver. After 6.5 minutes all mechanisms out of the pipeline.On the wall of the pipe was coated with a thickness of 2-3 mmFloor for 4 hours passed before hardening.Then repeated the experiment and similarly made the second coating layer.Simultaneously with the application layer in the pipeline with the help of the device shown in Fig. 7, introduced in the folded condition of the two sleeves, made of yarn of polypropylene.The structure of the weave of the outer sleeve 30% was less than the inner sleeve.After that, the inner sleeve installed tor 500 mm inflated with air under pressure of 0.2 MPa.Air pressure equal to 0.03 MPa, Thor moved on the inner sleeve.After the release of the Torah from the pipeline inner sleeve method of its wrenching pulled from the pipeline. Withstood the pipeline within 4 hours for hardening of cement.Then decide on the surface of the sleeve caused laitance.The pipeline has stood for 48 h before formation of the cement stone. Then the pipeline tested the efficiency of the pipeline was smooth and even.Design description of the device
In Fig. 1 shows a device for cleaning the pipeline.In the pipe 1 installed trubochista device 2. The pipe 2 communicates with the system 3 water supply.Trubochista device 2 is made of shaft 4. running the hub 5. The hub 5 in a checkerboard pattern set 6 elastic and elastic 7 petals.The device shown in Fig.2, is made of two hubs 5 staggered fixed elastic 6 and 7 elastic petals. The hub 5 is connected between a three or four rods (studs) 8. Between the rods 8 in the center of the hub 5 has an electrode 9, which is a high-voltage cable 10 connected to the discharge station 11 (electric station).The device shown in Fig. 3, made of trubochistah device 2 camera 12 provided with the system 13 of the compressed air. In the chamber 12 is set to drive the reversing drum 14 on which is wound a cable 15 which is connected through lines 16 with the end of the sleeve 17, the other end of which is bent and fixed on the perimeter of the socket 18.On the part of the sleeve 17 with holes 19.The device shown in Fig.4, made sfig.5, made of abatement mechanism 2 (trubochista device), covering mechanism 21, a smoothing mechanism 22.Covering 21 and the smoothing mechanism 22 and rod 23 are interconnected. Between the cleaning mechanism 2 and the covering mechanism 21 is placed a solution of 24. System 13, an air supply connected to the pipeline 1.The covering mechanism 22 is made of a shaft 4 on which the hub 5. The hub 5 in a checkerboard pattern pinned elastic 6 and 7 elastic petals, and elastic petals attached with both sides of the elastic petals 7.The covering device of Fig. 9, 10 can be made of a set of elastic cones 25 or elastic petals 6, mounted on a rigid or flexible shaft 4. Between the cones 25 on the shaft installed Torah 26 or spacers 27.The device shown in Fig.6, is made of system 13, communicates with the pipe 1, which laid braided sleeve 27 or sleeves 28, 29.On the wall of the pipeline 1 applied layer of the solution 30. The sleeve 29 is installed tor 31.The device shown in Fig.7, is made of a covering mechanism 21, which the cable 15 is connected with the warehouse sleeve 28, which is made of TransPac which is fixed to the pipeline 1.The device shown in Fig.8, made of a system 13 of the gas flow of the drive gas 34 (receiver), which is connected to the pipeline 1. As the drive gas can be applied to any known generator, rocket engine, explosion of the combustible mixture, and so on, the Volume of gas must exceed the volume of the pipeline in 2-5 times.Description of the device
The device shown in Fig. 1, operates as follows. System 3 in the pipe 1 serves water 6, which moves the cleaning device 2 to line 1. Trubochista device 2 begins to move through the pipeline 1. Part of the flow of water through cracks formed of elastic petals 7, forms a jet that cleans the pipeline from deposits, the formation of cavitation, which break down fat.The device shown in Fig. 2, operates as follows.The system serves water, which pushes the treatment device (mechanism) through the pipeline 1, the slits are formed in the jet. Streams erode sediments. Periodically to the electrode 9 is applied with a high voltage. Between the electrode 9 and the rods 8 breakdown occurs. During the breakdown occurs electro-shock accelerating jet. When ecotraction the interaction between a number of cavitary increased tenfold. Therefore, the destruction of the sediments is more intense.The spark occurs each time with different rods. Therefore, the formed vortex field of electrohydraulic shock, which also speeds up the process of destruction of the sediments. In addition, electrohydraulic shock force elastic petals to vibrate and transmit those vibrations on deposits and the pipeline. As these vibrations do not match the frequencies and phases, there is intense destruction deposits. During electro-shock during the reflection of waves from a pipeline deposits are very considerable force, pulling them from the wall of the pipeline. Therefore, deposits are destroyed very intensely. In addition, in a confined space appear vortices carrying particles with velocities 340-720 m/C. This effect also contributes to the acceleration of the destruction of the sediments. Joint use of electrohydraulic and barodynamics effects of several forms of third elements such as tension and compression pipeline and sediment in opposite phases, which would accelerate the process of destruction deposits.The device shown in Fig.3, operates as follows.Evo 2 creates a jet of water, which flow through the gap formed by the elastic petals 7 water jets destroy fat. The system 13 is constantly circulates air in the sleeve 17. The drum means 14 rotates. The sleeve 17 is moved in the pipe 1 reciprocating. At that moment, when part of the sleeve 17, having a hole, pull themselves together, the holes 19 will be on the outer surface of the sleeve 17. Compressed air is supplied to the pipeline, producing a pneumatic shock that affects the pipeline, deposits and trubochista device 2.The wall of the pipeline and sediment begins to vibrate, but because they have different elastic limits and linear expansion coefficients, the sediments are separated from the pipe wall.Formed by water jets are also beginning to pulsate, their speed increases 6-15 times, and the number of cavitation increases 12 times. There is intense destruction deposits. The destroyed fat water taken out of the pipeline.The device shown in Fig. 4 operates similarly to the device shown in Fig.3.In it the air in the pipe exits through the open end of the sleeve 17, when the sleeve 17 is completely slips out, the sterile air.Because in the cavity of the pipe 1 enters several tens of cubic meters of compressed air, the pneumatic impact impact extends several kilometers away from the sleeve. Therefore, the intensity of the destruction of deposits increases many times.The device shown in Fig.5, operates as follows.It trubochista device 2 is used for a new purpose.First, it clears the pipeline pneumatology mixture coming through the slit of the elastic petals 7, and also due to vibration petals 7.Secondly, the resistance to movement of the device 2 to line 1 is chosen so that it was the largest, more than the efforts of the covering 21 and smoothing 22 mechanisms.System 13 in the pipe 1 serves compressed air, which passes through a hole in the smoothing mechanism 22 and presses on the covering mechanism 21. Covering 21 mechanism presses the solution 24, which presses on the cleaning mechanism 2 (trubochista device). Mechanisms 2, 21, 22 begin to move through the pipeline 1 with a solution of 24.Solution 24, penetrating through cracks formed of elastic 7 petals, is deposited on the wall of the pipe is and the wall of the pipeline 1.The covering mechanism 22 pulls on the formed layer of solution 24 smoothing mechanism 22, which smoothes the solution layer 24 and forms a smooth coating. Through the cavity of the pipeline 1 with the coating is continuously hot air as it is compressed.The air removes from the applied layer moisture and reduces the fluidity of the solution. Therefore, the solution does not slip from the top of the pipe, as it occurs in all known piston devices. In the device smoothing mechanism in addition to the basic functions of the smoothing down of the applied layer of the solution also performs an additional function - creates through ejection vacuum. Under these conditions the moisture from the coating intensively removed. Without this condition cannot be applied to the surface of the pipe solution with high turnover, because after application to the surface of the pipeline caused the solution will slip to the bottom of the pipe.After the air passes through slit coating solution, it surrounds the mortar on all sides. The solution begins to move in the annular air bag. The sliding friction of the solution 24 on the wall of the pipe 1 is reduced in 3-7 times, so large portions of the solution, you re the C solution 24 and through the gap, educated elastic 7 petals, it expands. The air velocity in the pipe increases, and it goes into the environment (atmosphere).When the air outlet of the cleaning mechanism 2 it is mixed with the sediment particles removed from the pipe wall. The air bears from solution aerosol cement-sand mixture, which interacts with the wall of the pipeline 1. Is the application of the aerosol solution on the wall of the pipe by the method of gunning. Therefore, the pipeline throughout covered with a thin layer of cement-sand mixture. This layer has a high adhesion to the metal surface of the pipeline 1. Passing air mixture is dried.When the ingress of liquid solution on this layer it sticks to it. Therefore, on the wall of the pipeline can hold thicker layer of liquid solution.Creating sub-layer before applying the liquid coating applied for the first time. This has significantly increased the length of the covered pipeline segment 1.The device shown in Fig.6, operates as follows.On the freshly applied layer 30 solution in the folded position laid one or two sleeves 28, 29, which have a mesh structure of the plet is, 9 fixed before this to the wall of the pipeline 1. Top 31 begins to roll in the hole(s) 28, 29, pushing him to the wall of the pipeline 1 and pressing the outer sleeve 2 in the solution. After tor 31 reaches the end of the covered area of the inner sleeve 29 can be removed or left in the pipeline 1.The device shown in Fig. 7, operates as follows.System 13 in the pipeline serves the air that moves through the pipeline covering mechanism 21. The covering mechanism pulls the warehouse 32 of the sleeve 28 (29). Slay 33 of the sleeve 28 (29) are reset and due to the tension sleeve is arranged on the lower part of the pipeline 1 for all its length.The device shown in Fig.8, works as follows.System 13 in the memory 34 (receiver) pumped the air. In the pipe 1 installed mechanisms 2, 21, 22 and bathed in the solution (Fig.5). After accumulation of the calculated quantity of air open valve 35. The air from the drive 34 enters the pipeline and expanding, where its temperature falls. The air rapidly begins to move through the pipeline mechanisms 2, 21, 22 and the solution 24, which produce the floor.To create pressure for covering mechanism 22 in Tr known manner, for example blow up the TNT, amoral or gas form through the use of a rocket engine. The use of "shot" (instantaneous expansion of the product) to cover the pipeline gave some unexpected effects:
- changed the structure of cement stone,
the strength of the coating increased two to four times,
- adhesion coating has increased three times.The mechanism of "shot" we have not been studied. It is assumed that during the shot is the activation of a pipe, its polarization and activation of the solution, due to the impact of high specific loads. It is also possible that formed electromagnetic tornado that special effect on the formation of the coating.The device shown in Fig.9, operates as follows.Device (covering mechanism 22) is installed in the pipeline 1 and give the air. Work covering 22 mechanism similar to the cover 22 of the mechanism shown in Fig.5.The device shown in Fig.10, is similar covering mechanism 22, shown in Fig. 5, Fig.9. Top 26 is pressed cone to the surface of the pipeline 1. Therefore, the tension nut can be adjusted force is actively sanitize pipelines, used and also to make cleaning and coating of new pipelines. 1. The method of cleaning a pipeline from deposits, namely, that the fluid flow through the pipeline move Trubodetal mechanism with cuffs, on the periphery of which form a liquid jet that removes deposits from the pipe wall, characterized in that the number of generated jets is in the range 9-36 jets.2. The method according to p. 1, characterized in that a jet of fluid in the cavity of the pipeline affected by the discharges.3. The method according to p. 1 or 2, characterized in that the electric discharge is produced between the cuffs or before the first cuff.4. The method of coating of the pipeline, including cleaning of the pipeline from deposits, transfer adhesive through the pipeline, marking the inner surface of the pipeline, the smoothing of the coating, characterized in that the displacement of the adhesive through the pipeline and the destruction of its walls sediments are performed simultaneously, the products remove sediments are mixed with the adhesive and the resulting composition is applied to the cleaned surface of the pipeline with the application of pressure to the applied composition.
the Torno put a layer of adhesive and coating smooth down.6. The method according to p. 4, characterized in that the press simultaneously two sleeve, while the outer sleeve has a more sparse structure of the weave than the inner sleeve.7. The method according to p. 6, wherein remove the inner sleeve.8. A device for cleaning the pipeline containing the shaft and hub are staggered fixed elastic and elastic petals, characterized in that the number of elastic petals in each row is equal 9-36.9. Device for cleaning a pipeline containing bonded between a hub with cuffs, which are on the periphery made the gap, characterized in that the fastening hub made rods, between which was installed in the center electrode connected to the electric station.10. The device according to p. 9, wherein the cuff is made whole, and the slits are in the form of grooves.11. The device according to p. 9, wherein the cuff is made of are installed on the hub in a checkerboard pattern elastic petals with education on the periphery of the cuff slits.12. A device for cleaning the pipeline containing the delivery system and liquid moving through the pipeline cleaning mechanism, soie cracks on the periphery of the device, characterized in that it is provided with a traction body and the mechanism of creation of the pneumatic-hydraulic shock, which is placed behind a cleansing mechanism.13. The device according to p. 12, characterized in that the mechanism for creating pneumatic-hydraulic shock-contains a compressed gas, which is in communication with the camera, and the camera is the mechanism for reciprocating movement of the sleeve, the end of which is connected with the traction body and the second end of the sleeve bent and fixed on the perimeter of the socket, and the sleeve has openings for air outlet.14. The device according to p. 13, characterized in that the connection end sleeve with traction body is made through a flexible rod and slings.15. Device for coating of the pipeline containing the mechanism for applying the solution, the solution supply system, compressed gas, characterized in that it is equipped with a cleaning mechanism pipeline from deposits, the mechanism for the creation of back pressure, which is set during the first cover, and the mechanism of application solution is connected with a smoothing mechanism, which has openings for the passage of gas.16. The device according to p. 15, characterized in that the mechanisms achievab with acceleration.17. Device for coating of the pipeline containing the movement of solution through the pipeline and applying it to the surface of the pipeline, the gas supply system, the supply system solution, characterized in that it is provided with a mechanism for moving the sleeve on the pipe, mechanism for pushing the sleeves applied to the pipe surface layer of the solution, and the mechanism for moving the sleeve along the pipeline includes a tool storage sleeve, a flexible connection connected to the mechanism for moving the sleeves.18. The device under item 17, characterized in that the mechanism for pushing the sleeve contains a compressed gas and Thor placed in sleeves.19. The device under item 17 or 18, characterized in that it is equipped with a system of accumulation of compressed gas, which is communicated with the compressed gas to the pipeline.20. The device according to p. 19, characterized in that the system capacity and accumulation is 2 to 5 volumes of the pipeline.21. The device according to p. 19, characterized in that the movement of the solution and the mechanism of its application is provided by instantaneous feed the compressed gas, the volume of which exceeds the amount of the covered pipeline.
recent performed as mounted on the hubs elastic cones or placed in a checkerboard pattern elastic and elastic petals.23. The mechanism under item 2, characterized in that the shaft with the hub of the flexible coupling are connected in series, while the shaft is made rigid or flexible.
SUBSTANCE: device comprises the assembling-arresting unit which locks the bushing against self-unscrewing. The bushing is provided with a heat insulating material and sealing composition and is made of the self-unscrewing spring, which accumulates mechanical energy. The inner end of the spiral belt is provided with a blade, which is mounted in the vicinity of the face edge of the inner end of the belt and the ends of which are provided with guiding projections. The method comprises setting the assembling-locking unit with the bushing on the pipe end to be welded, assembling the pipe butt by moving the end of the pipe to be welded onto the projections of the bushing and heat insulating material to provide a gap between the pipe faces, unlocking the bushing, and removing the assembling-locking unit. The spiral belt is unwound with sliding with respect to the inner end. The gap size depends on the thickness of the assembling-locking unit. The projections of the blade cooperate with the side edges of the belt turns and cause the sealing composition to move thus providing a protecting roll.
EFFECT: enhanced reliability of the pipeline.
3 cl, 6 dwg
FIELD: corrosion prevention technologies.
SUBSTANCE: method includes serial application of layers of polymer compositions to metallic surface, while serial layers of polymer compositions are made with various thermal expansion coefficients. As said polymer composition polyurethane compound is used with special admixtures and filling agent, influencing thermal expansion coefficient of covering layer, and content of said filling agent in each following layer is set less than content of said filling agent in previous layer.
EFFECT: higher efficiency.
2 cl, 9 ex
SUBSTANCE: protecting coating comprises several layers. One of the layers is made of an elastomer. The elastomeric sealing layer is made of a calendered raw rubber which is protected with the fiber glass fabric from both sides. The fiber glass fabric is impregnated with phenol-formaldehyde resin with subsequent solidifying and vulcanizing the rubber.
EFFECT: enhanced reliability.
SUBSTANCE: method comprises removing the exhaust insulation from the pipeline, preparing the outer side, applying the primer coat, and winding belt coating made of oil polymer. The belt coating is reinforced with glass net.
EFFECT: enhanced reliability.
FIELD: pipeline transport.
SUBSTANCE: method comprises fusing corrosion-resisting metal on the zone of the inner surface directly adjacent to the faces of pipes, lining the inner surface of the pipe ends including the surface of the fusing by adhesion coating made of heat-resistant corrosion-resisting material, applying anticorrosion coating on the inner surface of pipes including the surface of lining, and joining pipes by welding. The adhesive coating made of the heat-resistant corrosion-resistant material is made by gas-thermal spraying of the corrosion-resistive metal.
EFFECT: enhanced reliability.
1 cl, 2 dwg
FIELD: protection of metals against corrosion; protection of extended underground gas lines against corrosion.
SUBSTANCE: proposed method includes restoration of defective sections of gas lines by application of insulating protective coats and connection with cathode protection system; defective section of gas line is preliminarily disconnected from gas main and is freed from natural gas; gas released from this section is compressed and is charged in reservoirs under pressure; gas line surface is cleaned from soil and defective coat by forming temperature gradient and stresses between defective coat and gas line; then finish cleaning of outer surface of gas line is performed at simultaneous suction of dust and gas line is heated to temperature of 70 to 175°C, after which layers of adhesive composition and dielectric insulating coat are applied at succession at overlapping joints between steel pipes of gas line and layer of spiral-shaped coat made from metal at potential more negative as compared with potential of gas line being protected; metal coat is applied in form of tape or foil whose ends are brought out at distance of (0.01-1)d, where d is diameter of pipe. Then, insulating plastic coat is applied on metal coat and after erection of gas line, ends of tape or foil are electrically connected at points of joints of steel pipe over entire length of gas line through switching units and parameter measuring units.
EFFECT: enhanced reliability of corrosion protection; considerable reduction of energy expenses; increased service life of metal coat.
3 cl, 10 dwg
SUBSTANCE: method comprises setting the tip in the end section of the pipe lined by a plastic shell. A protector is fit in the tip with interference. The tip clamps the end of the plastic shell by mandrelling. The tip is fit in the pipe with interference. The tip is mandrelled out of the zone of protector.
EFFECT: enhanced reliability.
FIELD: protection of pipe against corrosion.
SUBSTANCE: method comprises applying prime coat on metallic surface at a temperature of no less than 10°C, applying insulating polymeric belt coating on metallic surface, and heating the coating to provide its shrinking.
EFFECT: enhanced corrosion protection.
6 cl, 1 tbl, 3 ex
FIELD: pipeline construction.
SUBSTANCE: method comprises applying interrupted layer of concrete-sand coating along the section of the pipeline to be repaired, allowing the layer to solidify, and applying the coating throughout the length of the pipeline section to be repaired. The coating mixture is supplied through the step hose thus allowing the thickness of the coating to be up to 400 mm for the diameter of the pipeline up to 5000 mm.
EFFECT: enhanced reliability.
2 cl, 5 dwg
SUBSTANCE: method comprises applying epoxy primary layer and thermo-shrinking adhesion belt provided with a protecting layer on the surfaces to be insulated. The epoxy primary layer is applied on the surface heated up to a temperature of 60-90°C.
EFFECT: enhanced reliability.
4 cl, 1 tbl