RU2795493C1 - Lining hose, injection line section with lining hose, method for refurbishing an old fluid pipeline, as well as a method for supplementing an injection pipeline - Google Patents

Abstract

FIELD: hoses.

SUBSTANCE: invention relates to a lining hose (2) formed from at least three layers (4, 6, 8) of the hose, in particular for the restoration of fluid-conducting systems, comprising a) at least one inner layer (4) of the hose , b) at least one middle layer (6) of the hose, which has a seamless fabric (16) formed from the warp threads (12) and weft threads (10), with the warp threads (12) running in the longitudinal direction, and the weft threads ( 10) in the circumferential direction of the lining hose (2), and c) at least one outer layer (8) of the hose, the weft threads (10) being more elastic than the warp threads (12). In addition, the invention relates to a section (18) of the injection pipeline with this lining hose (2), as well as a method for restoring an already laid old fluid pipeline and for supplementing the injection pipeline with this lining hose (2).

EFFECT: effective design.

12 cl, 5 dwg, 1 tbl

Description

The present invention relates to a lining hose formed from a minimum of three layers of hose, in particular to restore or reinforce/complement fluid-conducting systems. The lining hose includes at least one inner layer of the hose, at least one middle layer of the hose, having a seamless fabric formed from warp and weft yarns, with the warp threads running in the longitudinal direction, and the weft threads in the circumferential direction of the lining hose, and at least one outer layer of the hose. Further, the invention relates to a section of the injection pipe with this lining hose, as well as a method of repairing an already laid old (worn) fluid pipe and for supplementing a (newly laid) injection pipe using a lining hose.

In the case of generic hose systems, which are used, for example, to refurbish old fluid pipelines, such as existing fresh water or wastewater pipelines, the so-called fabric hose reline process is used. In this case, a fabric hose - the so-called liner (Inliner) - with the resin-impregnated inner layer turned outwards, is placed in the pipeline to be restored, so that the resin-impregnated layer is on the outside. By applying pressure, it is achieved that the resin-impregnated outer layer adheres to the inside of the fluid conduit. Thus, pipelines that require restoration are restored.

In this regard, for example, DE 10 2016 109 843 A1 describes a liner hose for the restoration of fluid-conducting systems with an inner film hose based on thermoplastic polymer, with an outer film hose based on thermoplastic polymer and with at least one fiber hose impregnated with a curable resin between internal and external film hose based on a composite material of industrially obtained inorganic fibers, natural fibers or mineral fibers and man-made fibers.

These known, curable resin-impregnated fiber hoses have, however, the disadvantage that the recovery hose must be glued to the old fluid conduit over its entire surface in a secure fit. Accurate and reliable bonding requires extremely expensive pre-treatment of the metal surface on the inside of the old fluid conduit (cleaning, sandblasting, deburring), which is associated with high costs. This recovery hose has a low gas tightness due to the material. Because of this, a place of poor (missing) adhesion leads to the formation of gas pressure between the pipe and the hose, which can lead to separation of the recovery hose. In addition, placing the recovery hose in the old pipe using the compressed air reversal method and the reversing chamber limits the length of the recovery to a maximum of 250 meters.

Other fabric hoses are known, such as DE 199 41 669 C2 discloses, which can be used for high-pressure fluid pipelines with a fabric of high strength fibers formed from warp and weft yarns, this fabric being located between the inner and outer coating of thermoplastic polymer .

Despite the fact that these known fabric hoses reliably restore pressure lines, they still have other disadvantages. Known lining hoses can only be used to a relatively limited extent in pressure lines with more highly variable diameters. In particular, due to corrosion or prior minor repairs, the relatively highly variable inner diameter of old fluid lines requires that the lining hose conform to these diameter changes without the risk of damage to the layers, or, for example, fabric, under pressure loading. Also in the region of the connectors, by means of which two sections of the injection pipeline are connected to each other, the lining hose is subjected to relatively high radial forces. Because of this, it is often necessary to provide correspondingly different liner hoses with adapted diameters for different diameters of systems to be rehabilitated.

Therefore, the object of the present invention is to provide a lining hose which, while providing the lowest possible installation costs, is formed to be more resistant to changing diameters in the fluid-conducting systems to be supplemented.

According to the invention, this is solved in that the weft threads have a greater elasticity than the warp threads.

Thus, a liner hose is provided whose flexibility in the radial direction is greatly increased. In this way, pressure pipes with larger deviations in diameter from the nominal diameter can also be restored or supplemented. The liner hose fabric is not damaged even after re-pressurization of the injection line equipped with the liner hose, and is therefore made to be as durable as possible. In addition, the warp threads can be made as low stretch/rigid as possible to allow the liner hose to be drawn into the existing injection piping.

Further preferred embodiments are claimed in the dependent claims and further explained in more detail.

Accordingly, it is also preferable if the weft threads have two to twenty times, preferably seven times to twelve times more elasticity than the warp threads. This further increases the radial flexibility of the entire liner hose.

In addition, it is preferable if said at least three hose layers are formed in such a way that the liner hose between the pressure-free state and the pressure-loaded state of its interior undergoes a diameter expansion of between 5% and 50%, preferably between 10% and 20%. , particularly preferably by 15%. As a result, the usually occurring diameter fluctuations are maximally deftly leveled. The pressure-loaded state should be understood as a state in which a certain pressure is applied in the interior of the liner hose (depending on the selected outer diameter) so that the liner hose fits snugly against the inner walls of the pipe to be restored (“tight fit” - tight fit).

If the lining hose (in pressurized/expanded state) has an outside diameter between 100 mm and 1000 mm, it can be inserted in the most varied ways into the available pressure pipes.

In addition, it has turned out to be particularly advantageous if the weft threads and/or the warp threads (and/or all other components of the lining hose) are resistant to (extracted/occurring, in particular in oil production) fluids, preferably to crude oil and/ or crude oil derived fuel/combustibles such as gasoline or diesel and/or other crude oil derivatives and/or aggressive industrial effluents. Thanks to this, the lining hose is used in the most diverse ways.

In addition, it is preferred if the weft threads contain polyphenylene sulfide (PPS) fibers or consist entirely of polyphenylene sulfide (PPS). This results in the most versatile lining hose.

If the weft threads and/or the warp threads (and/or all other components of the lining hose) are resistant to temperatures up to 80°C, further preferably to temperatures up to 120°C, then the area of use of the lining hose, in particular, oil and gas industry is further expanding. Overall, this provides an aging-resistant lining hose for use.

As an alternative to the previously described preferred application of the liner hose for conveying crude oil etc., the liner hose according to one other preferred embodiment is used for conveying (cold) fresh water/drinking water pipelines. In this context, it is particularly preferred if the weft threads consist of PBT, PET, PA and/or PES. In this case, it is further preferred if the weft threads have a stretchability of 40%.

With respect to the inner and outer layers of the hose, it has also proven to be beneficial for efficient manufacturing if the material of the inner layer of the hose and/or the material of the outer layer of the hose is a polymeric, preferably a thermoplastic material.

With regard to the material of the inner layer of the hose, it has also proved to be advantageous for economical manufacture if the thermoplastic polymer of the inner layer of the hose is selected from the group consisting of polyolefin, polyamide, polyether, polyester, polyurethane, fluoropolymers such as, for example, polyvinylidene fluoride, or mixtures thereof.

With respect to the outer layer material of the hose, it has also proven to be advantageous for economical manufacture if the thermoplastic polymer is selected from the group consisting of polyolefin, polyamide, polyether, polyester, polyurethane, fluoropolymers such as, for example, polyvinylidene fluoride, or mixtures thereof.

If the warps contain fibers of aramid, aramid copolymer, basalt, carbon and/or glass fibers, or consist entirely of aramid, aramid copolymer, basalt, carbon and/or glass fibers, then these warp threads can be produced as efficiently as possible.

In this case, the respective hose layers (inner hose layer, middle hose layer and outer hose layer) are preferably in contact with each other. In particular, the layers of the hose are in contact with each other through their sheath surfaces (inner sheath surface and/or outer sheath surface).

It has proven to be advantageous if the inner layer of the hose and/or the outer layer of the hose have a thickness between 1 mm and 4 mm, preferably a thickness of 2 mm.

If the lining hose has a length between 1000 m and 4000 m, the longest lengths of pressure lines or old fluid lines can be completed in one run (without interruption and without intermediate connections).

Preferably the warp thread count of the fabric is at least 4,000 dtex and at most 15,000 dtex.

Preferably, the weft count of the fabric is at least 15,000 dtex and at most 25,000 dtex.

Further, the invention relates to a section of an injection pipeline for transporting a fluid medium, preferably consisting of a metal, such as steel, an outer pipe and a liner hose according to the invention according to at least one of the previously described embodiments adjacent to the outer pipe from the inside according to the invention.

In addition, the invention relates to a method of restoring an already laid old fluid pipeline, wherein first the lining hose according to the invention according to at least one of the previously described embodiments is drawn into the old fluid pipeline, and then the lining hose is loaded with internal pressure in such a way that the liner hose was internally adjacent to the old fluid conduit.

The invention also relates to a method for supplementing a (newly laid) injection pipeline, comprising the following steps:

a) provision of injection piping, and

b) drawing the lining hose according to the invention according to at least one of the previously described designs into the injection pipeline.

As a fluid medium, specifically, in general, is meant a medium that does not resist arbitrarily slow shear. The concept of “fluid medium” standing above denotes gases and liquids, since most physical laws are equally valid for both states of aggregation, and many of the properties differ only quantitatively, but not qualitatively.

Fabrics are generally understood as flat textiles of at least two systems of threads crossed at right angles, the so-called warp thread running in the longitudinal direction and the so-called weft thread perpendicular to it.

The rest of the details, aspects and advantages of the present invention will follow from the following description of the embodiments based on the drawings.

Shown:

Fig. 1 is a perspective view of a local section of a liner hose according to the invention, formed according to one preferred embodiment, the three-layer structure of the liner hose being clearly visible,

Fig. 2 is a detailed view of the one preferably used in FIG. 1 fabric showing various warp and weft threads,

Fig. 3 is a detailed view, alternatively to FIG. 2 applied fabrics showing different warp and weft threads,

Fig. 4 is a schematic representation of the three-layer structure used in the lining hose of FIG. 1 and also

Fig. 5 is a schematic representation of the sequence of steps of a method for manufacturing a section of an injection pipe using a lining hose according to the invention.

The figures are only of a schematic nature and therefore serve solely for understanding the invention. Like elements are provided with the same reference numerals.

The lining hose 2 according to the invention has, according to FIG. 1 and 4 a three-layer structure consisting of an inner hose layer 4, a middle hose layer 6 including a fabric 16, and an outer hose layer 8. The lining hose 2 is used according to the invention, as will be explained further in conjunction with FIG. 5, either for lining new sections 18 of the injection pipe, for supplementing/reinforcing already laid new injection pipes or alternatively for the restoration (reconstruction) of already laid old fluid pipelines, which, for example, due to corrosion have lost their strength.

The lining hose 2 has a generally flexible structure. Preferably, the lining hose 2 is wound on a transport reel before being placed in the pressure line. In this case, the lining hose 2 is formed flexible in such a way that it is folded in this state of transport, i.e. so that at least two opposing regions of the inner perimeter of the liner hose 2 touch each other. Typically, the liner hose 2 is folded into a double-walled U-shape.

The inner layer 4 of the hose usually has a high degree of impermeability and resistance to the transported fluid. Further, it protects the middle layer 6 of the hose from the inside of the hose.

In one preferred field of application of the lining hose 2 in crude oil-carrying injection lines, the material of the inner layer 4 of the hose is a flexible thermoplastic polymer, here thermoplastic polyurethane. Other designs also use other materials, such as polyolefin, polyamide, polyether, polyester, fluoropolymers, such as, for example, polyvinylidene fluoride, or mixtures thereof, as material for the inner layer 4 of the hose.

In the case of water pipes, flexible polyethylene is preferably used for the material of the inner layer 4 of the hose.

The outer layer 8 of the hose has the function of protecting the middle layer 6 of the hose from external influences. This includes, in particular, mechanical stress when the hose is retracted and the influence of weather conditions, such as moisture and micro-organisms. The material for the outer layer 8 of the hose is preferably a flexible thermoplastic polymer. Depending on the purpose of use and the characteristics of the surface of the inner circumferential wall of the pipe to be restored, for example, polyethylene (m-LLD-PE, LLD-PE, LD-PE and MD-PE), polypropylene, thermoplastic polyurethane or soft PVC are suitable. Also polyolefin, polyamide, polyether, polyester, polyurethane, fluoropolymers such as, for example, polyvinylidene fluoride, or mixtures thereof, are also suitable for the material of the outer layer 8 of the hose.

The fabric 16 of the lining hose 2 contained in the middle layer 6 of the hose is woven on a circular loom from weft threads 10 and warp threads 12, shown in more detail in FIG. 2. The weft yarns 10 run in the circumferential direction of the liner hose 2, and the warp yarns 12 run in the longitudinal direction of the liner hose 2. The warp yarns 12 use high tenacity and high modulus fibers with high yarn count and high weave density of aramid. Other embodiments vary in the material of the warp threads 12, alternatively using fibers of aramid copolymer, basalt, carbon and/or glass fibers, or warp threads 12 made entirely of these fibers.

According to the invention, the weft threads 10 are made of a different material than the warp threads 12, and the weft threads 10 have greater elasticity, i. higher stretchability without breaking than the warp threads 12. In this way, it is possible to adapt the lining hose 2 in diameter to varying ratios of the diameter of the injection line or the old fluid line.

In the exemplary embodiment shown with FIG. 1 and 2, the weft threads 10 consist entirely of polyphenylene sulfide. In this way, an efficient and aging-resistant liner hose 2 is obtained, which is formed to be resistant both to fluids transported during oil production, in particular crude oil, and resistant to temperatures up to 120 ° C without damage or breakage of the weft threads 10.

For the sake of completeness, it should be pointed out that the lining hose 2 is alternatively used for transporting cold fresh water/drinking water. For this, polymers in the form of PBT, PET, PA or PES for the weft threads 10 have proven to be particularly preferred.

It is also possible, according to FIG. 3 to weave the fabric 16 of the middle layer 6 of the hose alternatively to the first embodiment with double weft threads 10 and/or according to other embodiments with double warp threads 12. Reference is made in this connection to EP 0 535 203 B1, which discloses a circular loom with a constant heddle stroke, which leads to a particularly high quality of the middle layer 6 of the hose, which includes the fabric 16.

The hose layers 4, 6, 8 can also in principle be provided multiple times, respectively. Therefore, in other, for brevity, not shown in more detail, versions also have more than one inner layer 4 of the hose and/or more than one outer layer 8 of the hose, and/or more than one middle layer 6 of the hose.

With the help of FIG. 5 is a schematic representation of a method for manufacturing a section 18 of an injection conduit. In this case, in the first step, an outer tube 14 is made available, preferably in the form of a steel tube. A lining hose 2 is also provided. This can be seen in the upper part of the image of FIG. 5.

This is followed in a second step by the liner hose 2 being drawn into the outer tube 14 as can be seen in the middle part of the image of FIG. 5. To this end, the lining hose 2 is folded, preferably in its cross-sectional shape.

Finally, in the third step, the lining hose 2 is pressurized from the inside, so that the lining hose 2 is unfolded and (with its outer layer 8 of the hose) is applied from the inside all the way to the outer pipe 14 to form the finished section 18 of the injection pipeline.

In this regard, it should be pointed out that with a method not shown separately for clarity, the process for reinforcing/completing a (new) injection line or for restoring an old fluid line is carried out in the same way. Then, in the first step, the injection pipeline or the old fluid pipeline is already present as an XYZ system; additionally, a lining hose 2 is provided that is the same length or longer than the injection line or the old fluid line.

In a second step, the lining hose 2 is passed back into the injection line already laid underground or into the already existing old fluid line. In the third step, the lining hose 2 is pressurized and is thereby applied from the inside to the injection line or to the old fluid line.

The following Table 1 summarizes the essential data of preferred embodiments of the lining hose 2 according to the invention according to the figures.

Table 1 Fabric hose based on polyphenylene sulfide Inner layer of the hose Thermoplastic polyurethane (TPU)
2 mm outer layer of hose TPU
2 mm Fabric fiber warp threads: aramid; weft threads: PPS The linear density of the main thread 8000 dtex Linear density of the weft thread 18000 dtex Fabric type twill burst pressure 5-30 bar Hose length 4000 m

List of reference positions

2 lining hose

4 inner layer hose

6 middle layer hose

8 outer hose layer

10 weft thread

12 main thread

14 outer tube

16 cloth

18 section of the discharge pipeline

Claims (19)

1. Lining hose (2), formed from at least three layers (4, 6, 8) of the hose, in particular for the restoration of fluid-conducting systems, including a) at least one inner layer (4) of the hose, b) at least one middle layer (6) of the hose, having a seamless fabric (16) formed from warp threads (12) and weft threads (10), wherein warp threads (12) run in the longitudinal direction, and weft threads (10) in the circumferential direction of the lining hose (2), and c) at least one outer layer (8) of the hose, characterized in that the weft threads (10) have more elasticity than the warp threads (12). 2. Lining hose (2) according to claim 1, characterized in that the weft threads (10) have from two to twenty times higher elasticity than the warp threads (12). 3. Lining hose (2) according to claim 1 or 2, characterized in that said at least three layers (4, 6, 8) of the hose are formed in such a way that the lining hose (2) between the pressure-free state and the pressure loaded state state performs diameter expansion between 5% and 50%. 4. Liner hose (2) according to one of claims 1 to 3, characterized in that the liner hose (2) has an outer diameter between 100 mm and 1000 mm. 5. Liner hose (2) according to one of claims 1 to 4, characterized in that the weft threads (10) and/or warp threads (12) are resistant to crude oil and/or fuel derived from crude oil. 6. Lining hose (2) according to one of claims 1 to 5, characterized in that the weft threads (10) contain polyphenylene sulphide fibers or consist entirely of polyphenylene sulphide. 7. Lining hose (2) according to one of claims 1 to 6, characterized in that the weft threads (10) and/or warp threads (12) are resistant to temperatures up to 120°C. 8. Lining hose (2) according to one of claims 1 to 7, characterized in that the material of the inner layer (4) of the hose and/or the outer layer (8) of the hose is a polymeric material. 9. Lining hose (2) according to one of claims 1 to 8, characterized in that the warp threads (12) contain fibers of aramid, aramid copolymer, basalt, carbon and/or glass fibers or consist entirely of aramid, aramid copolymer , basalt, carbon and/or fiberglass. 10. Section (18) of the injection pipeline for transporting fluid with an outer pipe (14) and with a lining hose (2) adjacent to the outer pipe (14) according to one of claims 1-9. 11. A method for restoring an already laid old fluid pipeline, wherein first the lining hose (2) according to one of claims 1 to 9 is drawn into the old fluid pipeline, and then the lining hose (2) is loaded with internal pressure so that the lining the hose (2) is against the inside of the old fluid line. 12. A method for supplementing an injection pipeline, including the following steps: a) provision of injection piping, and b) retracting the lining hose (2) according to one of claims 1 to 9 into the injection pipeline.

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