Flexible conducting element for transporting hydrogen-containing fluids

Abstract

The subject matter of the invention is a flexible conducting element (12) for transporting a hydrogen-containing fluid, having an inner layer (14), conducting the hydrogen-containing fluid, and an outer layer (13), surrounding the inner layer (14). The inner layer (14) consists of a first material and the outer layer (13) consists of a second material. According to the invention, the conducting element has the following features: - a hydrogen permeability at a temperature of 293 K of the first material is 1.5 · 10-9 mol / (m s MPa) or less, - the inner layer (14) and the outer layer (13) are designed in such a way that, for a predefined temperature and a predefined partial pressure difference, a hydrogen permeability rate of the inner layer (14) is lower by a factor of 2 or more than a hydrogen permeability rate of the outer layer (13), and - a Shore A hardness of the first material and a Shore A hardness of the second material are less than 90. As a result of its advantageous properties, the conducting element according to the invention can be flexibly and dependably used for transporting hydrogen.

Description

[0001] Flexible pipe element for transporting hydrogen-containing fluids

[0002] The present invention relates to a flexible conduit element for transporting hydrogen-containing fluids. The conduit element comprises an inner layer conducting the hydrogen-containing fluid and an outer layer surrounding the inner layer, wherein the inner layer consists of a first material and the outer layer consists of a second material.

[0003] Such line elements for the transport of hydrogen-containing fluids are used, for example, in gas supply networks, in the field of refueling technology and as supply lines within fuel cells or gas heaters (which are at least partially powered by hydrogen). The material of the inner layer can be designed in such a way that it has the best possible resistance to the transported medium, while the material of the outer layer can be designed in such a way that it is as resistant as possible to the prevailing environmental influences (for example to abrasion or other mechanical stress, UV radiation, ozone, etc.). Under the given operating conditions, the line element must be sufficiently permeation-tight to prevent the escape of large quantities of hydrogen from the line element and the formation of explosive atmospheres outside the line element.

[0004] US 6,213,155 B1 discloses a fluid-impermeable composite hose with a metal foil in its wall, wherein one of several layers forming the wall of the hose is a laminated layer formed by laminating the metal foil, a reinforcing material with high tensile strength, and a resin film. Against this background, the object of the present invention is to provide a conduit element for transporting hydrogen-containing fluids that can be used flexibly and ensures high operational reliability.

[0005] The line element according to the invention is characterized by the following features: a hydrogen permeability at a temperature of 293 K of the first material is 4.0 ■ 10 -9mol / (ms MPa) or less, the inner layer and the outer layer are designed such that, at a given temperature and a given partial pressure difference, a hydrogen permeability rate of the inner layer is lower by a factor of 2 or more than a hydrogen permeability rate of the outer layer, a Shore A hardness of the first material and a Shore A hardness of the second material are less than 90.

[0006] First, some terms used in this description will be explained. The term hydrogen-containing fluid refers to a gaseous, liquid or a mixture of gaseous and liquid components that contains gaseous hydrogen. The hydrogen-containing fluid may also have other components. For example, the hydrogen-containing fluid may be a mixture of gaseous hydrogen with one or more gaseous hydrocarbons (e.g. natural gas) or a mixture of gaseous hydrogen with a liquefied gas (e.g. LPG). The temperature-dependent hydrogen permeability (hereinafter also referred to as where T is the temperature) of a material refers to the amount of hydrogen particles (hereinafter also referred to as N Hrepresented) , which per unit of time (hereinafter also represented by t), unit of area (hereinafter also represented by A) and partial pressure difference (hereinafter also represented by where p and p2 represent the hydrogen partial pressures prevailing on both sides of the material layer in question) passes through a non-porous barrier formed from the material with a certain layer thickness (hereinafter also referred to as L). The following relationship applies to hydrogen permeability:

[0007] The hydrogen permeability can be determined according to DIN 53536 and expressed, for example, in the unit mol / (ms MPa) (moles per (meter times second times megapascal)).

[0008] The hydrogen permeability rate of a layer refers to the mass of hydrogen in the hydrogen-containing fluid that passes through the layer per unit time under specified conditions, in particular given the parameters of hydrogen partial pressure difference, temperature, area, and layer thickness of the barrier formed by the layer. The hydrogen permeability rate of a non-porous layer, at a given temperature and hydrogen partial pressure difference, results from the hydrogen permeability of the material, the particle weight, the area of ​​the layer available for passage, and the layer thickness. If the layer is porous or has passage channels, hydrogen can also pass through these channels. Such channels can be introduced into the layer mechanically, for example by so-called "pricking."

[0009] The Shore A hardness can be determined, for example, according to DIN ISO 7619-1.

[0010] The pipe element can be designed for a maximum pressure between 6 bar and 100 bar. Furthermore, the pipe element can be designed for a temperature range between -50 °C and 150 °C. The inner layer can be bonded to the outer layer by means of an adhesive layer. Furthermore, one or more reinforcements can be provided between the inner and outer layers.

[0011] The second material is preferably different from the first material.

[0012] Due to the low hydrogen permeability of the first material, it can be ensured that during operation only very small amounts of hydrogen can escape from the transport channel enclosed by the inner layer through the inner layer to the outside. Within the scope of the invention, it was recognized that this alone is not sufficient, however, to provide a line element that is safe and stable over longer periods of time. In particular, it was recognized that over longer periods of time a quantity of hydrogen can accumulate between the inner layer and the outer layer. The resulting build-up of pressure between the layers can lead to the outer layer detaching from the inner layer and thus to the destruction of the line element.To prevent such gas accumulation in an intermediate space (for example, in the area of ​​the bonding layer or in the area of ​​the reinforcement), the inner and outer layers are designed such that the hydrogen permeability rate of the inner layer (under the same test conditions) is lower than that of the outer layer. This measure ensures that hydrogen particles that escape from the interior (within the inner layer) through the inner layer to the outside at a certain rate continue to migrate through the outer layer at a higher rate and are thus released into the environment without any gas accumulating between the layers.

[0013] In an advantageous embodiment, it is provided that the ratio of the hydrogen permeability of the first material <p (T) zu einer Schichtdicke der Innenschicht is smaller than the ratio of a hydrogen permeability of the second material 2 ( ) (at the same temperature) to a layer thickness L2 of the outer layer. In this case, therefore, (f>±(T') / L1< 2(r) / L2 applies. Furthermore, the hydrogen permeability rate of the inner layer can be smaller than the hydrogen permeability rate of the outer layer by a factor of more than or equal to 2, preferably by a factor of more than or equal to 5, more preferably by a factor of more than or equal to 10, and particularly preferably by a factor of more than or equal to 15. It is understood that the ratios given above are based on test conditions that are identical for the inner layer and the outer layer.The above-mentioned features make it possible to particularly reliably prevent gas accumulation between the inner layer and the outer layer, while the low hydrogen permeability of the inner layer simultaneously ensures that only a small amount of hydrogen escapes from the line element.

[0014] A layer thickness of the inner layer can, for example, be between 0.4 and 5.0 mm, preferably between 1.0 and 3.0 mm. A layer thickness L2 of the outer layer can be between 1.0 and 5.0 mm, preferably between 1.5 and 5.0 mm. In the prior art, it was common practice to use a material with a large layer thickness for the inner layer and to create a mechanically stable and strong connection between the inner and outer layers in order to prevent the outer layer from detaching from the inner layer. This often led to line elements with low flexibility or bendability. Since regular bending of the line element can lead to increased friction between the inner and outer layers, which accelerates the process of the outer layer detaching from the inner layer, the low flexibility offered additional advantages in terms of the durability of the connection between the inner and outer layers.However, within the scope of the invention, due to the different hydrogen permeability rates of the inner layer and the outer layer according to the invention, as well as the low hydrogen permeability of the first material, the problem of detachment of the outer layer from the inner layer is significantly reduced. For this reason, it is possible to use a first material with a low Shore A hardness in the line element according to the invention, which tends to be associated with high elasticity. The invention thus enables the production of very flexible line elements, while at the same time keeping the risk of detachment of the outer layer from the inner layer to a minimum. The area of ​​application of the line element is thereby significantly expanded and user-friendliness improved. In particular, smaller bending radii can be achieved. The use of the line element e.g.in the context of refueling applications is made significantly easier.

[0015] Furthermore, it was recognized that the pipe element can be used in an expansion joint to compensate for or absorb movements, vibrations, or length changes in stationary pipelines. Due to the low Shore A hardness of the first material, it is possible to absorb movements and vibrations in a particularly efficient manner.

[0016] The Shore A hardness of the first material can be less than 85, preferably less than 80, more preferably less than or equal to 75. The Shore A hardness of the second material can also be less than or equal to 85, preferably less than or equal to 80, more preferably less than or equal to 75. The flexibility is thereby further increased. Furthermore, it can be provided that a Shore A hardness of the first material is more than 30, preferably more than 50, more preferably more than 60.

[0017] The flexible line element can have at least one of the following further features:

[0018] - the first material has a hydrogen permeability at a temperature of 293 K of 2.4 ■ 10 -9 mol / (ms MPa) or less, preferably 1.8 ■ 10 -9 mol / (ms MPa) or less, more preferably 1.2 ■ 10 -9 mol / (ms MPa) or less, more preferably 1.0 ■ 10 -9mol / (ms MPa) or less,

[0019] - a hydrogen permeability at a temperature of 293 K of the first material is lower than a hydrogen permeability at a temperature of 293 K of the second material.

[0020] The outer layer may be provided with mechanically produced hydrogen permeation channels designed to increase the hydrogen permeability rate of the outer layer. The hydrogen permeation channels represent perforations in the outer layer and can be created by so-called "pricking," in which the outer layer is pierced with dimensionally stable needles of very small diameter.

[0021] The first material is preferably an elastomer in a temperature range between -50°C and 150°C or has elastomeric properties in this temperature range. The aforementioned temperature range can preferably be between -40°C and 120°C, more preferably between -30°C and 100°C, and more preferably between -20°C and 90°C. This means that the material deforms in a rubber-like manner (i.e., "entropy-elastic") under tensile or compressive stress and essentially returns to its original shape after the stress is removed. Below the glass-rubber transition temperature, the first material has thermoplastic properties. In particular, the elasticity of the material can decrease by several orders of magnitude during the transition.For an elastomer, there is a fixed relationship between the Shore A hardness and the compressive modulus of elasticity (see, for example, "Determining the compressive modulus of elasticity of elastomers using Shore A hardness" (reprint from the journal Kunststoffe 6 / 2006, pages 92-94, Carl Hanser Verlag, Munich, 2006). It has been shown that, particularly when the first material is an elastomer, the low Shore A hardness according to the invention is accompanied by a low modulus of elasticity.

[0022] In an advantageous embodiment, the first material comprises chlorosulfonated polyethylene rubber or epichlorohydrin rubber. The first material may consist predominantly or exclusively of chlorosulfonated polyethylene rubber or epichlorohydrin rubber.

[0023] The second material is preferably an elastomer in a temperature range between -65°C and 150°C or has elastomeric properties in this temperature range. In one embodiment, the second material comprises chloroprene rubber. It can be provided that the second material consists predominantly or exclusively of chloroprene rubber. Using the materials mentioned, a conduit element can be produced that is sufficiently permeation-tight and simultaneously has the inventive ratio of hydrogen permeability rates, low hardness, and high flexibility.

[0024] In one embodiment, the flexible conduit element comprises one or more strength members which is / are arranged between the inner layer and the outer layer. Alternatively, the strength member can also be embedded in the inner layer or in the outer layer or applied to the outer layer. This configuration is used in particular for transporting fluids under high pressure, for example for transporting gases liquefied under pressure. The strength member or parts of the strength member can be formed from a metal. It is preferably provided that the strength member comprises or consists of a chromium-nickel-molybdenum steel. The carbon content of the chromium-nickel-molybdenum steel can more preferably be 0.03 wt. % or less. Alternatively or additionally, the nickel content of the chromium-nickel-molybdenum steel can be 12 wt. % or more.Alternatively or additionally, the chromium-nickel-molybdenum steel can be X2CrNiMol 7-12-2 according to AIS I 316L or X2CrNiMol 8-14-3 according to AIS I 316L or X6Cr-Ni-Mo-Ti l 7-12-2 according to AIS I 316Ti. The aforementioned metallic strength members are characterized by low hydrogen embrittlement.

[0025] In one embodiment, the conducting element is designed such that an electrical resistance measured between the inner layer and the outer layer is less than 10 9 Ohm, preferably less than 10 6Ohm. The electrical resistance between the inner layer and the outer layer can be measured by electrically contacting the conducting element at a first surface element on the outer surface of the outer layer and a second surface element opposite the first surface element on the inner surface of the inner layer, and measuring the resistance between the surface elements. In addition, an electrical resistance measured between the ends of the conducting element can be less than 10 9 Ohm, preferably less than 10 6 Ohm, further preferably less than 10 5 Ohms. The electrical resistance measured between the ends of the conducting element is obtained by electrically contacting the inner and outer layers at each end and measuring the resistance between the two contacts. The specific resistance of the conducting element can be less than 10 10Ohm / m, preferably less than 10 7 Ohm / m, more preferably less than 10 6 Ohm / m. The above-mentioned specific resistance is obtained by simultaneously electrically contacting both layers at two longitudinally spaced surface elements and determining the resistance per unit length between the two surface elements. In one embodiment, a specific resistance of the outer layer or the inner layer of the conductive element is less than 10 10 Ohm / m ( Ohm per meter ), preferably less than 10 7 Ohm / m further preferably less than 10 6Ohm / m . The above-mentioned specific resistance of a layer is obtained by measuring each layer independently of the other layer (i.e. without being electrically connected to the other layer). It has been shown that the above-mentioned (specific) electrical resistances enable reliable dissipation of electrical charges and can thus prevent sparking. In doing so, it is preferably ensured that in each of the two layers there is sufficient dissipation of charge along the longitudinal direction and that electrical charges can also be dissipated from one layer to the other. The above-mentioned resistance values ​​(along and between the conducting elements) can be obtained in a basically known manner, for example by adding conductive additives (e.g. carbon black) to the material of the respective layer.The measurement of the aforementioned resistance values ​​can be carried out in particular in the manner described in DIN EN ISO 8031. By preferably designing both the inner layer and the outer layer to be electrically conductive, as explained above, the invention differs from the specifications of DIN EN ISO 8031, according to which, in multi-layer hoses, either only the inner layer or only the outer layer should be electrically conductive.

[0026] The invention further relates to a compensator which comprises a flexible line element according to the invention, a first compensator fitting connected to a first end of the flexible line element, and a second compensator fitting connected to a second end of the flexible line element. The compensator fitting preferably has an outwardly projecting flange element. The flange element can be plate-shaped and extend outwards from a circumferential surface of the line element substantially perpendicular to an axial direction of the line element. The flange element can have a plurality of through-holes extending in the axial direction and, viewed in the axial direction, have a thickness of between 0.5 cm and 5 cm, preferably between 1 and 3 cm.

[0027] The compensator fittings can each be connected to a suitable counterpart. The connection can be realized, for example, by a screw connection. In this way, the compensator can be connected in particular to fixed pipelines and serves to absorb or compensate for movements, changes in length, or vibrations in the fixed pipelines. It has been shown that the pipe element according to the invention is particularly suitable for this purpose due to its low hardness.

[0028] In one embodiment, the inner diameter of the pipe element can be between 20 mm and 500 mm, preferably between 25 mm and 150 mm. The inner diameter of the pipe element is determined by the inner diameter of the inner layer. In the prior art, pipe elements with inner diameters of this size were unsuitable for expansion joints, since the flexibility and bendability of the pipe element were significantly too low at these diameters.

[0029] In one embodiment, an electrical resistance measured between the compensator fittings is less than 10 9 Ohm, preferably less than 10 6 Ohm, further preferably less than 10 5Ohm. These measures can also ensure that electrical charges on the compensator are safely dissipated through the line element and that large static charges do not build up. This prevents sparking and the associated risk of explosion.

[0030] The invention further relates to a flexible hose line comprising a flexible line element according to the invention and at least one, preferably two, hose fittings connected to the flexible line element at the end. With the aid of the hose fitting, the hose line can be connected to a suitable connection. In one embodiment, an electrical resistance measured between the hose fittings (which is essentially determined by the resistance of the line element) is less than 10 9 Ohm, preferably less than 10 6 Ohm, further preferably less than 105 Ohm . The advantages already mentioned above are also realized here .

[0031] The inner diameter of the pipe element can, for example, be between 8 mm and 50 mm, preferably between 13 mm and 25 mm. In the prior art, pipe elements for transporting hydrogen were extremely inflexible, especially with larger inner diameters.

[0032] Advantageous embodiments of the invention are explained below by way of example with reference to the accompanying drawings. They show:

[0033] Figure 1: a partially sectioned view of an embodiment of a line element according to the invention;

[0034] Figure 2: a partially sectioned side view of a compensator according to the invention;

[0035] Figure 3 : a side view of two inventive

[0036] hose elements.

[0037] Figure 1 shows a three-dimensional, partially sectioned side view of a conduit element 12 according to the invention for transporting a hydrogen-containing fluid. The conduit element 12 comprises a cylindrical inner layer 14, which serves to conduct the hydrogen-containing fluid. The inner layer 14 is made of chlorosulfonated polyethylene rubber, which has a Shore A hardness of 75 and a hydrogen permeability at a temperature of 293 K of 1.0 - 10 9 mol / (ms MPa). The thickness of the inner layer is 2 mm. The inner diameter of the inner layer is 20 mm.

[0038] Outside the inner layer 14 there is an outer layer 13, which is also cylindrical and which is in full contact with the inner layer 14 and is bonded to the inner layer 14 by the manufacturing process. The outer layer 13 is made of chloroprene rubber, which has a Shore A hardness of 60 and a hydrogen permeability at a temperature of 293 K of 10 ■ 10 -9mol / (ms MPa). The thickness of the outer layer 13 is also 2 mm. The hydrogen permeability rate of the inner layer is presently approximately 10 times lower than the hydrogen permeability rate of the outer layer. In an alternative embodiment, the hydrogen permeability rate of the outer layer can also be (additionally) increased by the introduction of hydrogen passage channels; therefore, it is not absolutely necessary for the hydrogen permeabilities of the materials of the inner layer and the outer layer to differ by a factor of 10.

[0039] During manufacture of the conducting element, a first strength member 15 formed by a metal braid and a second strength member 16 formed by a metal coil are embedded between the inner layer and the outer layer. The strength members 15, 16 are formed from X2CrNiMol 7-12-2. In one embodiment, it can be provided that a further strength member formed by a metal braid is provided, which is arranged outside the metal coil (not shown). In this case, the metal coil is surrounded by metal braids on both sides.

[0040] Figure 2 shows a partially sectioned side view of a compensator according to the invention. The compensator comprises a line element 12 according to the invention, wherein the elements already mentioned above in connection with Figure 1 are provided with the same reference numerals in Figure 2. Furthermore, the compensator comprises compensator fittings 18 which are connected to the ends 20, 21 of the line element and which in this case are formed by flange elements projecting outwards perpendicular to an axial direction of the line element 12. The compensator fittings 18 comprise through holes 19 extending in the axial direction, through which fastening elements can be passed in order to establish a connection with a corresponding flange element.

[0041] In contrast to the embodiment of Figure 1, the pipe element 12 in the embodiment of Figure 2 is not cylindrical, but rather curved outward in the center between the compensator fittings 18. This allows for better compensation of movements and vibrations of pipe elements that are connected to the compensator by means of the compensator fittings 18.

[0042] In contrast to the line element in Figure 1, an additional strength member 17 is embedded in the material of the inner layer 14 at each of the ends 20, 21 of the line element 12. The strength member 17 is formed from a metal wire made of X2CrNiMol 8-14-3 and extends in a circle along the circumference of the line element 12. At the front ends of the compensator fittings 18 there is a circular groove into which the strength member 17 is inserted together with the respective end 20, 21 of the line element. When producing a connection between a compensator fitting 18 and a corresponding flange element, an end face of the compensator fitting 18 is pressed against an end face of the corresponding flange element.During this process, the part of the pipe element (connecting section 23) which is inserted into the groove is clamped between the compensator fitting and the corresponding flange element and is thus fixed.

[0043] Figure 3 shows a side view of two flexible hose lines according to the invention. Each of the hose lines comprises a line element 12 according to the invention and a hose fitting 22 mounted at one end of the line element 12.

Claims

Patent claims 1. Flexible conduit element (12) for transporting a hydrogen-containing fluid, comprising an inner layer (14) conducting the hydrogen-containing fluid and an outer layer (13) surrounding the inner layer (14), wherein the inner layer (14) consists of a first material and the outer layer (13) consists of a second material, characterized by the following features: - a hydrogen permeability at a temperature of 293 K of the first material is 4.0 ■ 10 -9 mol / (ms MPa) or less, - the inner layer (14) and the outer layer (13) are designed such that, at a given temperature and a given partial pressure difference, a hydrogen permeability rate of the inner layer (14) is lower by a factor of 2 or more than a hydrogen permeability rate of the outer layer (13), and - a Shore A hardness of the first material and a Shore A hardness of the second material are less than or equal to 90.

2. Flexible conduit element (12) according to claim 1, wherein the Shore A hardness of the first material and / or the Shore A hardness of the second material is less than or equal to 85, preferably less than or equal to 80, more preferably less than or equal to 75.

3. Flexible conduit element (12) according to claim 1 or 2, wherein the hydrogen permeability rate of the inner layer (14) is increased by a factor of 5 or more, preferably by a Factor 10 or more, more preferably by a factor of 15 or more lower than the hydrogen permeability rate of the outer layer (13).

4. Flexible conduit element (12) according to one of claims 1 to 3, characterized by at least one of the further features: - the first material has a hydrogen permeability at a temperature of 293 K of 2.4 ■ 10 -9 mol / (ms MPa) or less, preferably 1.8 ■ 10 -9 mol / (ms MPa) or less, more preferably 1.2 ■ 10 -9 mol / (ms MPa) or less, more preferably 1.0 -10 9 mol / (ms MPa) or less, - a hydrogen permeability at a temperature of 293 K of the first material is lower than a hydrogen permeability at a temperature of 293 K of the second material.

5. Flexible conduit element (12) according to one of claims 1 to 4, wherein the outer layer (13) has mechanically produced hydrogen passage channels designed to increase a hydrogen permeability rate of the outer layer (13).

6. Flexible conduit element (12) according to one of claims 1 to 5, wherein a Shore A hardness of the first material is more than 50, preferably more than 60.

7. Flexible conduit element (12) according to one of claims 1 to 6, wherein the first material in a temperature range between -50°C and 150°C, preferably between -40°C and 120°C, more preferably between -30°C and 100°C, further preferably has elastomeric properties between -20°C and 90°C.

8. Flexible conduit element (12) according to one of claims 1 to 7, wherein the first material comprises or consists of chlorosulfonated polyethylene rubber or epichlorohydrin rubber.

9. Flexible conduit element (12) according to one of claims 1 to 8, wherein the second material has elastomeric properties in a temperature range between -50°C and 150°C, preferably between -40°C and 120°C, more preferably between -30°C and 100°C, more preferably between -20°C and 90°C.

10. Flexible conduit element (12) according to one of claims 1 to 9, wherein the second material preferably comprises or consists of chloroprene rubber.

11. Flexible conduit element (12) according to one of claims 1 to 10, which further comprises at least one strength member (15, 16, 17) which is arranged between the inner layer (14) and the outer layer (13) or is embedded in the inner layer (14) and / or the outer layer (13) or is applied to the outer layer.

12. Flexible conduit element (12) according to claim 11, wherein the at least one strength member (15, 16, 17) is formed from a metal and preferably comprises or consists of chromium-nickel-molybdenum steel, wherein the carbon content of the chromium-nickel-molybdenum steel is more preferably 0.03 wt.% or less and / or the nickel content of the chromium-nickel-molybdenum steel is 12 wt.% or more and / or the chromium-nickel-molybdenum steel X2CrNiMol7-12-2 according to AISI 316L or X2CrNiMol8-14-3 according to AISI 316L or X6Cr-Ni-Mo-Til7-12-2 according to AISI 316T1.

13. Flexible conduit element according to one of claims 1 to 12, which is designed such that - an electrical resistance measured between the inner layer (14) and the outer layer (13) of less than 10 9 Ohm, preferably less than 10 6 Ohm, and / or - an electrical resistance measured between the ends of the conducting element of less than 10 9 Ohm, preferably less than 10 6 Ohm, further preferably less than 10 5 Ohm, and / or - a specific resistance of the outer layer or the inner layer of the conducting element of less than 10 10 Ohm / m, preferably less than 10 7 Ohm / m further preferably less than 10 6 Ohm / m, and / or - a specific resistance of the conducting element less than 10 10 Ohm / m, preferably less than 10 7 Ohm / m, more preferably less than 10 6 Ohm / m is .

14. Compensator, comprising a flexible line element (12) according to one of claims 1 to 13, a first compensator fitting (18) connectable or connected to a first end (20) of the flexible line element (12) and a second compensator fitting (18) connectable or connected to a second end (21) of the flexible line element (12), wherein the flexible line element preferably has an end-side connecting section (23) which when establishing a connection between one of the compensator fittings and a corresponding connecting element between the compensator fitting and the connecting element , wherein the compensator fitting further preferably has a circumferential groove positioned in an end face for receiving the connecting section , wherein the connecting section ( 23 ) further preferably has a reinforcing element ( 17 ) which is embedded in the line element , wherein after establishing the connection an electrical resistance measured between the compensator fittings ( 18 ) is preferably less than 10 9 Ohm, further preferably less than 10 6 Ohm, further preferably less than 10 5 Ohm is . 15 . Flexible hose line comprising a flexible line element ( 12 ) according to one of claims 1 to 12 and two hose fittings ( 22 ) mounted on the ends of the flexible line element ( 12 ), wherein preferably an electrical resistance measured between the hose fittings is less than 10 6 Ohm, further preferably less than 10 5 Ohm is .

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