Wear-resistant flexible pipeline

Abstract

FIELD: pipelines.SUBSTANCE: invention relates to flexible pipelines and slurry pipelines for transferring highly abrasive mixtures and media. A wear-resistant flexible pipeline includes an outer polyurethane layer, a reinforcing frame and an inner polyurethane layer with a filler of wear-resistant macroscopic particles. The dimensions of the wear-resistant macroscopic particles do not exceed the thickness of the inner polyurethane layer. The abrasion resistance of the wear-resistant macroscopic particles is higher than that of polyurethane.EFFECT: high reliability with a long service life in highly abrasive environments, and convenience during installation, dismantling and operation.10 cl, 7 dwg

Description

Field of technology

[0001] The present invention relates to flexible pipelines and slurry pipelines for transporting highly abrasive mixtures and media. Prior art

[0002] Flexible pipelines are made of various polymeric materials, most commonly rubber, due to their durability, high abrasion and corrosion resistance, light weight, reduced noise and vibration, and other advantages. Flexible pipelines can be either lay-flat or non-lay-flat, have a small bending radius, and can be used in various fields, depending on their type, the design of the materials they are made from, the media they must transport, and other factors. Wear-resistant pipelines are commonly used as slurry pipelines. Slurry pipelines are used for hydraulic delivery of saturated slurries, mixtures of water with large particles, sand, rock, abrasive waste, and other materials in hydromechanization. They are also used for dredging and cleaning reservoirs, mining operations, quarrying, and other purposes.The flexibility of slurry pipelines facilitates their installation on uneven surfaces, assembly and disassembly for one-time jobs, and installation in confined spaces. It also increases their resistance to pressure changes and thermal expansion, and offers other advantages during installation and operation. However, bends in slurry pipelines create additional abrasive loads in these areas. Despite the high abrasive resistance of polymers, this is insufficient for heavily loaded slurry pipelines with highly abrasive mixtures, increasing the likelihood of rupture and the need for replacement or repair. Increasing the wear resistance of polymers will reduce their flexibility, while other materials with higher wear resistance are often hard. Consequently, there is a need for pipelines with increased abrasion resistance without sacrificing flexibility.

[0003] The prior art discloses a technical solution disclosed in international patent application WO2013137770 (published: 19.09.2013, IPC: F16L 9 / 12; B29C 47 / 06; F16L 19 / 02; B29D 23 / 00; F16L 47 / 02; F16L 15 / 00), which relates to polymer pipes reinforced with a metal frame, which are used for transporting oil and gas, acids, alkaline products, drinking and industrial water, as well as for transporting aggressive and neutral pulps, for example, during underground leaching of rock. A metal-polymer reinforced pipe is declared, containing a welded metal frame and a polymer matrix having a molecular structure based on an amorphous phase. The metal-polymer reinforced pipe is obtained by extrusion molding with the simultaneous feeding of a polymer melt and a reinforcing metal frame into the molding cavity, followed by intensive cooling of the inner and outer surfaces of the formed pipe.The technical result of the invention is an increase in the quality and long-term strength in the radial direction of a metal-polymer reinforced pipe, while increasing the productivity of the manufacturing process, as well as an increase in the strength and manufacturability of a pipeline constructed from the pipes obtained.

[0004] The disadvantages of this alternative are that these pipes are rigid and cannot bend, which greatly increases the difficulty of their installation and dismantling, especially over long sections. Furthermore, the polymer-reinforced matrix is ​​subject to high wear, and many metals have lower wear resistance than some polymers used to make slurry pipelines. Polyurethane slurry pipelines have higher wear resistance than rubber ones and are equally flexible; however, the wear resistance of polyurethane may also be insufficient for the efficient and long-lasting operation of slurry pipelines.

[0005] The prior art also includes internet resources that describe the construction of slurry pipelines using wear-resistant polyurethane. For example, the internet resource "Flexible Pipelines with an Inner Polyurethane Layer Steelblast" (http: / / mmining.ru / gibkie-truboprovody-s-vnutrennim-sloem-iz-poliuretana.html) describes the construction of a flexible pipeline with an inner polyurethane layer for transporting extremely abrasive materials. Also known is the internet resource “Polymer Flat-Layable Pulp Pipelines” (http: / / www.baltrti.ru / produktsiya / mobilnyie-truboprovodyi-i-gibkie-emkosti / rukava-polimernyie-ploskie / primenenie-truboprovodov1 / pulpoprovodyi-polimernyie-ploskosvorachivaemyie1), which also describes polyurethane slurry pipelines for highly loaded pipelines (pressure, bending) and transportation of highly abrasive mixtures (coal, ore, sand).The high chemical resistance of thermoplastic polyurethane (TPU) increases its service life compared to rubber-fabric pulp pipelines.

[0006] However, the disadvantage of these analogues is also the insufficient wear resistance of polyurethane pipelines, since abrasive wear can increase locally, for example, due to bends.

[0007] Also known is the technical solution disclosed in the invention patent US10543985B2 (published: 14.01.2016, IPC: B65G 11 / 16, B02C 17 / 22, B32B 3 / 12, B32B 3 / 266), which relates to wear-resistant panels for the mining industry and material processing. The wear-resistant panel includes a housing matrix with an upper surface, a lower surface opposite the upper surface, and at least one cavity with cavity walls. The cavity passes through the upper surface and the lower surface. The wear-resistant panel also includes at least one wear-resistant element with a pre-formed shape. At least one wear-resistant element has an upper surface and a lower surface opposite the upper surface. The wear-resistant elements are located in the cavity and are fixed in place by their pre-formed shape and the cavity walls.The purpose of the present invention is to create an improved wear-resistant panel that is inexpensive, not subject to delamination, cracking, with a reliable connection of elements, etc.

[0008] A disadvantage of this invention is its inability to be used in flexible elements due to its use as a surface lining, the need for bolting to solid surfaces, and its panel configuration. Such panels also cannot be used inside pipelines due to the need to attach them to the inner surface and their lack of flexibility during operation.

[0009] Also known from the prior art is a product from Teknikum Group Ltd, namely Teknikum GRANIT® CERAMIC Antistatic (https: / / teknikum.com / product / teknikum-granit-sd-ceramic-material-handling-hose / ). The product description states that this is an extremely wear-resistant and durable version of the Teknikum GRANIT® hose. The hose's interior is made of ceramic, and a special manufacturing and vulcanization process ensures excellent adhesion between the rubber and ceramic. This hose also offers a longer service life than rubber hoses and is highly flexible with a small bending radius thanks to its corrugated coating and ceramic-rubber lining.

[0010] The disadvantage of this analogue is that it is made of rubber, the abrasive resistance and adhesion to ceramics of which is lower than that of polyurethane, which leads to its wear, as well as to the possible loss of ceramic elements from the ceramic-rubber lining, which also leads to a decrease in the reliability of the pipeline.

[0011] The main disadvantages of all the mentioned solutions are insufficient wear resistance of pipelines, lack of flexibility or the impossibility of using lining elements with pipelines. The essence of the invention

[0012] The objective of the present invention is to develop a flexible, wear-resistant pipeline that provides high reliability and a long service life in highly abrasive environments, as well as ease of installation, dismantling, and operation. This objective is achieved by improving the pipeline's operational characteristics, including its reliability and ease of use.

[0013] The stated technical result is achieved through a wear-resistant flexible pipeline, including an outer polyurethane layer, a reinforcing frame and an inner polyurethane layer with a filler of wear-resistant macroscopic particles, the dimensions of which do not exceed the thickness of the inner polyurethane layer.

[0014] A pipeline is a multi-layer cylindrical hollow element (a pipe with a multi-layer wall) within which the transported fluid moves. This multi-layer design allows for both improving the overall performance of the pipeline and selecting materials for interaction with specific conditions and environments. Wear-resistant flexible pipelines are most often used as slurry pipelines, as the wear-resistant inner polyurethane layer withstands abrasive wear well, increasing its reliability, while also offering high flexibility with a bending radius comparable to that of wear-resistant rubber.This is useful during installation, dismantling, and operation of the slurry pipeline, as, unlike rigid pipelines, they are much easier to install on uneven surfaces or in areas with elevation changes, eliminating the need for additional elements that deflect the pipeline at an angle. These pipelines can also be used on the water surface in conjunction with floats, as the water surface is fluid. Furthermore, the polyurethane inner layer allows for the transfer of certain weak acid and alkali solutions, is less susceptible to vibration and other physical stress, reduces the pipeline's weight, and is not susceptible to corrosion, unlike metal pipelines.The outer layer of the pipeline must also be protected from wear, as it can be exposed to various weather conditions, machinery, the surface on which the pipeline is laid, and other factors. Therefore, to increase pipeline reliability, it is also made of polyurethane. Multilayer construction allows for the selection of different polyurethane types depending on operating conditions. For example, the outer layer can be thinner than the inner layer, electrically conductive and heat-resistant, while the inner layer can be thicker for greater abrasion resistance and non-conductive properties, but not heat-resistant. This, in turn, directly influences the selection of specific polyurethane types to improve pipeline reliability and ease of use.Between the outer and inner layers is a reinforcing cage, which protects the pipeline from excessive kinks and increases its resistance to various types of stress, such as stretching, compression, torsion, localized pressure increases, and the like. It also allows the pipeline to withstand high pressures, for example, up to 16 atmospheres (PN16), and vacuum, which is also necessary to ensure the pipeline's reliability. The cage can be made of any flexible and durable material, such as metal or various types of plastic. In some embodiments, the reinforcing cage may be a metal mesh or spiral.

[0015] Also, in some embodiments of the present pipeline, it may have additional intermediate layers. In one embodiment, it may have at least one intermediate polyurethane layer. This layer may be necessary due to its different properties from the inner and outer layers, may be necessary for additional protection against leakage and pipeline rupture, and so on. The various properties that polyurethane may have, and the embodiments and purposes of the intermediate polyurethane layer, are obvious to those skilled in the art.

[0016] The pipeline may also have at least one intermediate reinforcing layer. For example, the intermediate reinforcing layer may be in the form of a cord. The cord may be made of fabric, metal, or composite fibers, threads, cords, or fabric. This layer can provide additional rigidity or strength to the pipeline, depending on the required pipeline characteristics.

[0017] However, as noted earlier, even a wear-resistant polyurethane layer may not withstand abrasive wear from the material being transported, especially if the wear increases locally, for example, at sharp bends in the pipeline, during pressure surges, or in already worn sections of the pipeline. To increase wear resistance, the inner polyurethane layer is filled with wear-resistant macroscopic particles whose size does not exceed the thickness of the inner polyurethane layer. It is necessary to select a particle material that can withstand higher abrasive wear than polyurethane. For example, this could be ceramic, as it is often used as a lining for various surfaces subject to wear. However, ceramics, like most materials with higher wear resistance than polyurethane, are hard materials, so constructing a flexible pipeline with an inner layer entirely made of such materials is impossible.To maintain the flexible properties of the pipeline, wear-resistant particles are incorporated into the polyurethane inner layer. These particles can be located both on the surface and within the polyurethane layer itself. Many types of polyurethane also exhibit superior adhesion compared to rubber. Due to the particles on the surface, the inner surface of the polyurethane inner layer partially matches the surface area of ​​these particles, increasing its wear resistance. Over time, due to abrasive wear, the polyurethane inner layer gradually wears away, causing even some of the particles that were within the layer itself to emerge on the surface, further increasing wear resistance.Moreover, the particles are not interconnected, and even if one particle cracks, the crack will not spread to the entire inner surface or other particles. The presence of polyurethane between the filler particles maintains the high flexibility of the entire pipeline. All this also contributes to the technical result, namely, increased reliability and ease of use of the pipeline.

[0018] In one embodiment of the pipeline, the filler of macroscopic wear-resistant particles can also be formed as flat inserts on the inner surface of the inner polyurethane layer. This increases the area of ​​the inner surface covered by the wear-resistant inserts, which also increases wear resistance and reduces potential turbulence during interaction between the liquid transported medium and the irregularly shaped macroscopic particles.

[0019] In another embodiment of the present invention, the pipeline may have a coupling, flange, weld, or other connecting element at at least one of its ends. Furthermore, the coupling fastening method allows for the installation of a flange coupling on any section of the pipeline, enabling installation under any routing conditions. To accommodate various connecting elements, the outer layer of the pipeline may also be chamfered or threaded, and additional sealing rings, end caps, and so on may be used. These connecting elements can be used to connect multiple pipelines to each other, connect to branch pipes, rigid elbows, or connect to various system components, such as slurry discharge openings in various ore processing devices in the mining industry, openings for the supply and / or discharge of water and various solutions, and so on.Other types of systems and devices, as well as other connecting elements, are obvious to those skilled in the art.

[0020] In one embodiment, the pipeline may also have sections with a reinforced inner layer, for example, in areas with sharp changes in pipeline direction, in sections with strong bends, or near elbows or connecting elements. In these areas, the pipeline can be made less bendable by providing an inner layer with a greater number of wear-resistant particles, increasing their size, or by increasing the thickness and size of the wear-resistant inserts. Description of the drawings

[0021] The subject matter of the present application is described point by point and clearly stated in the claims. The above-mentioned objectives, features, and advantages of the group of inventions are apparent from the following detailed description, taken in conjunction with the accompanying drawings, which show:

[0022] Fig. 1 shows a schematic sectional view of a wear-resistant flexible pipeline.

[0023] Fig. 2 shows a schematic cross-sectional view of a wear-resistant flexible pipeline with additional polyurethane and reinforcing layers.

[0024] Fig. 3 shows a schematic cross-sectional view of a wear-resistant flexible pipeline with a filler of wear-resistant particles made in the form of flat inserts on the inner surface of the inner polyurethane layer.

[0025] Fig. 4 shows a schematic view of a wear-resistant flexible pipeline with flanged connecting elements.

[0026] Fig. 5 shows a schematic view of a wear-resistant flexible pipeline with a reinforcing frame made in the form of a spiral.

[0027] Fig. 6 shows a schematic view of a wear-resistant flexible pipeline with a reinforced inner layer in the bending area of ​​the pipeline.

[0028] Fig. 7 shows a schematic view of a wear-resistant flexible pipeline with additional polyurethane and reinforcing layers, a reinforcing frame made in the form of a spiral, a filler of wear-resistant particles made in the form of flat inserts on the inner surface of the inner polyurethane layer and a welded connecting element in section.

[0029] These figures are explained by the following positions: 1 - inner polyurethane layer; 2 - outer polyurethane layer; 3 - reinforcing frame; 4 - filler of wear-resistant particles; 5 - intermediate polyurethane layer; 6 - intermediate reinforcing layer; 7 - connecting element; 8 - filler of wear-resistant particles made in the form of inserts.Detailed description

[0030] The following detailed description of the invention includes numerous implementation details to provide a clear understanding of the present invention. However, it will be apparent to one skilled in the art how the present invention may be used with or without these implementation details. In other instances, well-known methods, procedures, and components have not been described in detail to avoid unnecessarily obscuring the features of the present invention.

[0031] Furthermore, it is clear from the foregoing description that the invention is not limited to the embodiment described. Numerous possible modifications, changes, variations, and substitutions, while preserving the spirit and form of the present invention, are obvious to those skilled in the art.

[0032] The pipeline is a multi-layer cylindrical hollow element within which the transported medium moves. A schematic cross-sectional view of the wear-resistant flexible pipeline is shown in Fig. 1. The wear-resistant flexible pipeline includes an outer polyurethane layer 2, a reinforcing frame 3, and an inner polyurethane layer 1 with a filler of wear-resistant macroscopic particles 4, the dimensions of which do not exceed the thickness of the inner polyurethane layer 1. Multilayering makes it possible to both improve the overall characteristics of the pipeline and select materials for interaction with specific conditions and environments. As described above, the manufacture of the pipeline from materials with flexible properties ensures ease of installation, dismantling, and operation of the pipeline on various surfaces, among other advantages.Moreover, constructing the inner 1 and outer 2 layers of the pipeline from polyurethane ensures not only flexibility but also high resistance to many corrosive substances and impacts. This also directly increases pipeline reliability, reduces the likelihood of necessary repairs, and extends the pipeline's service life by 8-12 years compared to metal pipelines. Furthermore, the multilayer design allows for the selection of different polyurethane types depending on operating conditions. For example, the outer 2 layer can be thinner than the inner 1 layer and be electrically conductive and heat-resistant, while the inner 1 layer can be thicker for greater abrasion resistance and is non-conductive, but not heat-resistant. All of this, in turn, directly influences the selection of specific polyurethane types to improve the reliability and ease of use of the pipeline.The polyurethane inner layer 1 can also be selected based on its adhesion to the wear-resistant filler 4. Many types of polyurethane exhibit greater adhesion to various wear-resistant materials than rubber. A high degree of adhesion increases pipeline reliability by reducing the likelihood of filler 4 particles breaking off from the inner layer 1, increasing its wear resistance. The multilayer nature of the pipeline allows the properties of each layer to be selected based not only on external conditions and operating parameters, such as rigidity, electrical conductivity, and abrasion resistance, but also on the required interaction parameters with other pipeline elements, such as adhesion to other elements, thereby increasing product reliability. Pipeline diameters can range from 30 to 1500 mm, and the thickness of each layer from 2 to 100 mm.

[0033] Between the outer and inner layers 1 and 2, there is also a reinforcing cage 3, which protects the pipeline from excessive kinks, increases the pipeline's resistance to various types of impacts, such as stretching, compression, twisting, localized pressure increases, and the like, and also allows the pipeline to provide a high pressure regime, for example, up to 16 atmospheres (PN16), and strong vacuum, which is also necessary to increase the pipeline's reliability. The reinforcing cage 3 can be made of any elastic and durable material, for example, metals or various types of plastic. In some embodiments, the reinforcing cage 3 can be implemented in the form of a metal mesh or spiral, as shown in Fig. 5.In this case, reinforcing cage 3 is not made too thick or from too rigid materials, as this could negatively impact the flexibility of the entire pipeline. However, these parameters are selected based on other pipeline parameters, including its thickness, weight, diameter, and length, the number, type, and thickness of each layer, as well as the parameters of the transported medium and the environmental conditions in which it is used. The typical thickness of reinforcing cage 3, whether constructed in a mesh or spiral, ranges from 1 to 25 mm.

[0034] Also, in some embodiments of the present pipeline, it may have additional intermediate layers. In one embodiment, it may have at least one intermediate polyurethane layer 5. This layer may be necessary due to its implementation with properties different from the inner and outer layers, and may be necessary for additional protection against leakage and pipeline rupture, etc. The various properties that polyurethane may have, and the embodiments and purposes of the intermediate polyurethane layer are obvious to those skilled in the art. The pipeline may also have at least one intermediate reinforcing layer 6. For example, the intermediate reinforcing layer 6 may be in the form of a cord. Fabric, metal, or composite fibers, threads, cords, and fabric may be used as cords.This layer can provide additional rigidity or strength to the pipeline, depending on the required pipeline characteristics. A schematic cross-section of a wear-resistant flexible pipeline with additional polyurethane and reinforcing layers is shown in Figs. 2 and 6. These additional layers 5 and 6 enhance the pipeline's reliability.

[0035] To improve pipeline reliability, specifically to increase the resistance of inner layer 1 to abrasive and impact wear, especially if it increases locally, for example, in areas of severe bending of the pipeline, during pressure surges, or in already worn sections of the pipeline, inner polyurethane layer 1 is filled with wear-resistant macroscopic particles 4, the size of which does not exceed the thickness of inner polyurethane layer 1. Wear-resistant filler particles 4 can be made of various shapes and sizes, for example, they can be made in the form of balls, flat plates, irregularly shaped particles, and so on. The sizes can be the same or different, and it is best if they are fractions of the thickness of inner polyurethane layer 1.Furthermore, the size of the macroscopic filler particles 4 does not exceed the thickness of the inner layer 1. If the thickness and size of the filler particles 4 were to match, then the detachment or destruction of such a particle could result in a through hole in the inner layer 1, which would reduce the pipeline's reliability. The use of wear-resistant materials in the form of filler 4 within the inner polyurethane layer 1 is necessary to maintain the pipeline's flexible properties, which directly impacts its ease of operation. The wear-resistant filler particles 4 located within the inner layer 1 may partially protrude on the surface and partially be contained within the polyurethane layer 1 itself. Due to the surface particles, the inner surface of the inner polyurethane layer 1 is partially covered by wear-resistant materials, increasing its abrasion resistance.The combined use of a polyurethane inner layer 1 and a filler made of wear-resistant particles 4, which have a higher abrasion resistance than polyurethane, significantly increases the abrasion resistance of the entire pipeline and reduces the likelihood of filler particles 4 being detached from the inner layer 1, significantly enhancing the pipeline's reliability. Over time, due to abrasive wear, the inner polyurethane layer 1 can gradually wear away, causing some of the particles 4 that were within layer 1 to emerge on the surface, further enhancing the pipeline's wear resistance. Furthermore, the filler particles 4 are not bonded to each other, and even if one particle cracks, the crack will not spread to the entire inner surface or other particles. All of this contributes to the technical result, namely, increased reliability and ease of use of the pipeline.The filler material of wear-resistant particles 4 may be corundum, electrocorundum, silicon carbide, ceramics or other materials with a wear resistance higher than that of the polyurethane used for the inner layer 1.

[00369] In one embodiment of the pipeline, the filler of macroscopic wear-resistant particles 4 may also be made in the form of flat inserts 8 on the inner surface of the inner polyurethane layer 1. This increases the area of ​​the inner surface covered with wear-resistant material, which also increases the abrasive resistance of the pipeline, and also reduces possible swirls during the interaction of the liquid transported medium with the macroscopic particles 4 of irregular shape, which also increases the reliability of the pipeline. The inserts of wear-resistant particles 8 may be arranged on the inner surface in an orderly or random manner.A schematic view of a wear-resistant flexible pipeline with a filler of wear-resistant particles 4, made in the form of flat inserts 8 on the inner surface of the inner polyurethane layer 1, in section is shown in Fig. 3 and 7.

[0037] In another embodiment of the present invention, the pipeline may have a coupling, flange, welded, or other connecting element 7 at at least one of its ends for a detachable or welded connection of pipelines or for connecting pipelines to elements of various systems, for example, with openings for the discharge of pulp of various ore processing devices in the mining industry, with openings for the supply and / or discharge of water and various solutions, as well as with other devices or elements, such as adapters, tees, and so on. Furthermore, the coupling fastening method allows for the installation of the flange coupling 7 on any section of the pipeline, which ensures installation under any routing conditions. The pipeline may also have various connecting elements 7 at its ends.A welded connection can be achieved by using connecting elements that are pushed or screwed onto the outer layer 2 of the pipeline end and the second pipeline, an element, or structure that can melt and weld together. Other additional elements can also be used to enhance the reliability of such a connection, such as an additional coupling or flange attachment, or other elements known in the art. For a flanged connection, a chamfered groove can be made on the outer layer 2 of the pipeline to accommodate flanges, with an internal mating conical side. Bolts and nuts can be used to tighten the flanges. For connections using coupling elements, a thread can also be applied to the outer layer of the pipeline at the end to accommodate the mating thread of the inner side of the coupling, which is screwed onto it. Additional sealing rings, end caps, and other fittings can also be used.Other types of systems and devices, as well as other connecting elements, are obvious to those skilled in the art. A schematic of one version of a wear-resistant flexible pipeline with flanged connecting elements at the ends is shown in Fig. 4. These connection types improve the reliability and ease of operation, installation, and dismantling of the pipeline.

[0038] In one embodiment of the pipeline, it can also have sections with a reinforced inner layer 1, for example, in places with a sharp change in the direction of the pipeline, in sections with a strong bend, near branches or connecting elements 7. In these sections, the pipeline can be made slightly bendable by making the inner layer 1 with a greater number of wear-resistant particles 4, increasing their size, or by increasing the thickness and size of the inserts 8, as shown in Fig. 6. This, in turn, also increases the reliability of the pipeline due to a local increase in its wear resistance in areas with increased abrasive wear.

[0039] A wear-resistant flexible pipeline, in one of its embodiments, is shown in Fig. 7. The wear-resistant flexible pipeline includes an outer heat-resistant, electrically conductive polyurethane layer 2, 10 mm thick, providing protection from external influences, possessing sufficient flexibility and not accumulating a charge that could lead to injury or equipment failure. Beneath this is an intermediate, non-conductive polyurethane layer 5, 3 mm thick, providing additional protection from mechanical influences and insulating the inner layers from current. Next, there is a spiral reinforcing frame 3 made of 5 mm thick steel wire, ensuring the pipeline's shape is maintained and protecting it from excessive deformation, bending, etc.Beneath this is another intermediate polyurethane layer 5, 2 mm thick, followed by a reinforcing layer of polymer fiber cord 6, which increases the pipeline's strength and ability to withstand large pressure drops. The cord thickness is approximately 0.1-2 mm. Beneath the reinforcing cord 6 is an inner polyurethane layer 1 filled with wear-resistant particles 4, formed as inserts 8 on its inner surface. This layer is 15 mm thick and ensures extremely high wear resistance and, consequently, pipeline reliability. At one end of the pipeline, a welded connecting element 7 is also provided for convenient connection to other components. In this embodiment, the pipeline wall thickness is approximately 35-36 mm, and the diameter is 130 mm. The pipeline length is selected based on production requirements.

[0040] Thus, the design of wear-resistant flexible pipeline ensures increased reliability and ease of operation, installation and dismantling of the pipeline.

[0041] These application materials present a preferred disclosure of the implementation of the claimed technical solution, which should not be used as limiting other, particular embodiments of its implementation that do not go beyond the scope of the requested scope of legal protection and are obvious to specialists in the relevant field of technology.

Claims

1. A wear-resistant flexible pipeline comprising an outer polyurethane layer, a reinforcing frame and an inner polyurethane layer filled with wear-resistant macroscopic particles whose dimensions do not exceed the thickness of the inner polyurethane layer and whose abrasion resistance is higher than that of polyurethane.

2. A wear-resistant flexible pipeline according to paragraph 1, characterized in that it contains at least one intermediate polyurethane layer.

3. A wear-resistant flexible pipeline according to paragraph 1, characterized in that the wear-resistant macroscopic particles are made of ceramics, corundum or silicon carbide.

4. A wear-resistant flexible pipeline according to paragraph 1, characterized in that it contains at least one intermediate reinforcing layer.

5. A wear-resistant flexible pipeline according to paragraph 4, characterized in that the intermediate reinforcing layer is made in the form of a cord.

6. A wear-resistant flexible pipeline according to paragraph 1, characterized in that the filler made of wear-resistant particles is made in the form of flat inserts on the inner surface of the inner polyurethane layer.

7. A wear-resistant flexible pipeline according to paragraph 1, characterized in that it contains a coupling, flange or welded connecting element at at least one end of the pipeline.

8. A wear-resistant flexible pipeline according to paragraph 1, characterized in that the reinforcing frame is made in the form of a metal mesh.

9. A wear-resistant flexible pipeline according to paragraph 1, characterized in that the reinforcing frame is made in the form of a metal spiral.

10. A wear-resistant flexible pipeline according to paragraph 1, characterized in that it contains a section with a reinforced inner layer.

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