Improved compression sealing washer and sealing system

Abstract

The invention relates to a sealing system comprising two components (10, 10 ') which are part of a high-pressure or medium-pressure device containing a gas, where each of the components (10, 10') comprises an end face or assembly face (12) facing an end face or assembly face (12) of the other component (10), and where a compression sealing gasket (14, 14 ') is compressed between the end faces or assembly faces (12, 12') of the components (10, 10 '), the compression seal gasket (14, 14 ') comprises a body (18, 38) made of elastomeric material and comprises a radially outer face (20, 30) and a radially inner face (22, 32) coaxial with each other wherein at least one of the radially outer face (20, 30) and the radially inner face (22, 32) comprises at least one first thin layer (23, 33) made of metal or soft metal or PTFE and having a thickness of between 1 nm and 1 mm.

Description

Technical Field

[0001] The invention relates to a compression sealing gasket designed to reduce its permeability with respect to gases and / or with respect to external water or water vapor.

[0002] Sealing gaskets are intended for implementation at the connection between two parts on medium and high pressure gas isolation equipment. Background Art

[0003] Some medium voltage and high voltage equipment include hollow members in which conductors are arranged.

[0004] An insulating gas fills these members to isolate the conductors carrying electrical current at high voltage from the hollow members which are at ground potential.

[0005] The insulating gas can also withstand electric fields over short distances between conductors arranged in the component.

[0006] The connection between the two components comprises, for example, a tubular portion for each component and a sealing gasket placed between the tubular portions.

[0007] According to a known embodiment, the sealing gasket is made of an elastomer and is compressed between two components, for example two tubular portions or a tubular portion and a flat plate.

[0008] The compression of the two components or parts produces elastic deformation of the gasket, improving the tightness of the connection.

[0009] However, the gasket is generally made of an elastomer having permeability with respect to the barrier gas.

[0010] An object of the present invention is to provide a sealing gasket with significantly lower permeability in order to reduce the leakage rate of the entire device.

[0011] The goal is to achieve a leakage rate of less than 0.5% vol / year for the whole arrangement as described in the relevant IEC standards for switchgear, such as IEC 62271-203 for gas-disconnected switchgear.

[0012] This improvement is of particular interest as the industry moves toward barrier gases consisting of different mixtures and different gases than the popular SF6 gas used for decades, which exhibit additional effects of leakage due to the different properties of those new molecules used.

[0013] In particular, a gas comprising heptafluoroisobutyronitrile mixed with a diluent gas comprising carbon dioxide and oxygen is used to replace SF6. CO2 has a strong tendency to leak. O2 and N2 also leak, but less than CO2. These three gases have a stronger tendency to leak than SF6. These leaks are problematic, in particular because of the adverse effects of CO2 on the environment; in addition, the lost gas must also be replaced, which involves additional costs.

[0014] Another object of the present invention is to provide a sealing gasket which has a significantly lower permeability to heptafluoroisobutyronitrile and / or heptafluoroisopropyltrifluoromethylketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7) and / or to CO2 and / or O2 and / or N2 and / or to water or water vapor, in particular in gas isolation devices of the type mentioned above or in the present application, more generally in any high-voltage or medium-voltage component (such as a disconnector, or a switch, or a circuit breaker, or a gas isolation line), and / or in gas isolation devices implemented in medium-voltage or high-voltage applications. In practice, such a gas may contain:

[0015] - Heptafluoroisobutyronitrile, alone or in a mixture with O2 and / or CO2 and / or N2;

[0016] - and / or heptafluoroisopropyltrifluoromethyl ketone alone or in a mixture with O2 and / or CO2 and / or N2;

[0017] - or CO2 alone or mixed with O2 and / or with N2;

[0018] - N2 alone or mixed with O2 and / or CO2.

[0019] Furthermore, H2O is not desired inside such devices, and another object of the present invention is to provide a sealing gasket that reduces or limits or avoids the penetration of H2O (water and / or water vapor) from the outside of such gas isolation devices implemented in medium or high pressure applications. Summary of the invention

[0020] The present invention relates to a gasket (or a sealing gasket, or a compression sealing gasket, or a sealing system, or a sealing gasket system, or a compression sealing gasket system (any of these expressions may be used in the rest of this specification)), which comprises an annular body made of an elastomeric material and comprises a radially inner face and a radially outer face, wherein at least one of the radially inner face and the radially outer face comprises at least one first thin layer, which is made of metal or soft metal or PTFE, or comprises metal or soft metal or PTFE.

[0021] Thus, at least one first thin layer is deposited or formed on at least part of said radially inner face and / or said radially outer face.

[0022] In particular, in applications where gases such as heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7) are used, for example, at pressures between 1 bar and 20 bar, possibly mixed with diluent gases such as carbon dioxide and oxygen and / or oxygen-containing compounds, the first thin layer effectively prevents leakage of heptafluoroisobutyronitrile and / or heptafluoroisopropyl trifluoromethyl ketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7)) and / or CO2 and / or O2 and / or N2.

[0023] It also effectively prevents the penetration of H2O (incoming water and / or water vapor).

[0024] Preferably, the first thin layer:

[0025] - has a thickness between 1 nm and 1 mm, for example 300 nm or 1 μm;

[0026] - and / or at least partially or completely covers at least one of said radially inner face and said radially outer face.

[0027] In a particular embodiment, each of the radially outer face and the radially inner face carries a thin layer of the above type.

[0028] In a more particular embodiment:

[0029] - the first thin layer completely covers the radially outer face; and a thin layer made of metal or PTFE and having a thickness, for example, between 1 nm and 1 mm, partially or completely covers the inner face;

[0030] - Either the first thin layer partially covers the radially outer face; and a thin layer made of metal or PTFE and having a thickness between 1 nm and 1 mm completely or partially covers the inner face.

[0031] The body may further include end surfaces connecting the radially inner surface and the radially outer surface, at least one of the end surfaces including a second thin layer of metal or soft metal or PTFE.

[0032] The second thin layer:

[0033] - may partially or completely cover at least one of said end faces;

[0034] - and / or may have a thickness between 1 nm and 1 μm.

[0035] In the gasket, or sealing gasket, or compression sealing gasket, or sealing system, or sealing gasket system, or compression sealing gasket system according to the invention:

[0036] - if at least one of the first thin layer and / or the second thin layer is made of or comprises a metal or a soft metal, the metal or soft metal may be chosen, for example, from Ag, Al2O3, tin, copper, gold, iron or a mixture of these elements and / or any oxide of these elements;

[0037] If at least one of the first thin layer and / or the second thin layer is made of PTFE or comprises PTFE, the PTFE may be charged or uncharged (neat or with filler(s)).

[0038] The gasket, or sealing gasket, or compression sealing gasket, or sealing system, or sealing gasket system, or compression sealing gasket system according to the present invention may include at least two superimposed first thin layers of different materials, each layer, for example from the above list of metals or PTFE, one or both of the layers preferably having a thickness between 1 nm and 1 μm, the upper layer for example being used to protect the lower layer; in a particular instance, the lower layer is for example a metal or a soft metal from the above list or includes the metal or soft metal, and the upper layer protects the lower layer from corrosion.

[0039] In an embodiment of the gasket, or the sealing gasket, or the compression sealing gasket, or the sealing system, or the sealing gasket system, or the compression sealing gasket system according to the present invention, the radially outer surface and the radially inner surface may be parallel and / or coaxial to each other.

[0040] In another embodiment of the gasket, or sealing gasket, or compression sealing gasket, or sealing system, or sealing gasket system, or compression sealing gasket system according to the present invention:

[0041] - at least one of the radially outer surface and the radially inner surface has a wave or corrugated shape;

[0042] - and / or at least one end face has a wave shape.

[0043] The present invention also relates to a sealing system comprising two components, wherein each of the components comprises an end face or an assembly face facing the end face or the assembly face of the other component, and wherein a compression sealing gasket, or a sealing gasket, or a sealing system, or a sealing gasket system, or a compression sealing gasket system according to the present invention is arranged and compressed between the end faces or the assembly faces of the components.

[0044] The component or the sealing system may form part of a gas-insulated section of a high-pressure or medium-pressure installation, the gas-insulated section:

[0045] *To accommodate or be designed to accommodate:

[0046] - gases, possibly mixed with a gas or diluent gas comprising at least CO2 and / or O2 and / or N2 and / or oxygen-containing compounds and / or water vapour, such as heptafluoroisobutyronitrile and / or heptafluoroisopropyltrifluoromethylketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7));

[0047] - or at least CO2 and / or O2 and / or N2 and / or oxygen-containing compounds and / or water vapor;

[0048] * and / or the gas isolation portion or the device is surrounded or intended to be surrounded by an external atmosphere containing some water and / or water vapor.

[0049] The invention also relates to a gas isolation part of a high-voltage or medium-voltage device, the gas isolation part:

[0050] * containing or intended to contain a gas, such as heptafluoroisobutyronitrile and / or heptafluoroisopropyltrifluoromethylketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7)), which may be mixed with a gas or diluent gas comprising at least CO2 and / or O2 and / or N2 and / or oxygen-containing compounds and / or water vapor, or the part contains a gas comprising at least CO2 and / or O2 and / or N2 and / or oxygen-containing compounds and / or water vapor,

[0051] * and / or the gas-insulated portion is surrounded, or is intended to be surrounded, by an external atmosphere containing some water and / or water vapour,

[0052] The device further comprises a gas isolation part or two components according to the present invention, wherein each of the components comprises an end face or an assembly face facing the end face or the assembly face of the other component, and wherein a gasket, or a sealing gasket, or a sealing system, or a compression sealing gasket, or a compression sealing gasket system according to the present invention is arranged and compressed between the end faces or the assembly faces of the components.

[0053] The components may be at least partially cylindrical and may be arranged coaxially with each other and with the main axis A, the end face or assembly face of each component extending in a plane perpendicular to said main axis A.

[0054] Preferably, at least one of the end face or the assembly face comprises an annular recess in which the compression sealing gasket according to the invention fits.

[0055] Preferably, the gasket according to the invention is axially compressed by the end face or assembly face.

[0056] The invention also relates to a method for insulating a gas-insulated section of a high-voltage or medium-voltage installation, said gas-insulated section:

[0057] * containing a gas which may be mixed with a gas or a diluent gas comprising at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor, such as heptafluoroisobutyronitrile and / or heptafluoroisopropyltrifluoromethylketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7)), or the part containing a gas comprising at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor,

[0058] * and / or the gas-insulated portion is surrounded, or is intended to be surrounded, by an external atmosphere containing some water and / or water vapour,

[0059] The device further comprises two components, wherein each of the components comprises an end face or an assembly face facing an end face or an assembly face of the other component, and wherein a gasket, or a sealing gasket, or a sealing system, or a compression sealing gasket, or a compression sealing gasket system according to the present invention is arranged and compressed between the end faces or assembly faces of the components.

[0060] The gas may be contained in the apparatus at a pressure between 1 bar and 20 bar. BRIEF DESCRIPTION OF THE DRAWINGS

[0061] Figure 1 is a schematic diagram of a high pressure device comprising two components assembled together using the gasket of the present invention.

[0062] Figure 2A and 2B It is a detail of the assembly of the components, which shows how the gasket is received between the two components.

[0063] Figure 3 1 is a diagram showing a first embodiment of a gasket according to the present invention.

[0064] Figure 4 A diagram is shown representing a second embodiment of a gasket according to the invention.

[0065] Figure 5A-5B are front views of various embodiments of gaskets according to the present invention.

[0066] Figure 6 is a schematic diagram of a high-pressure device comprising a hole of a gas compartment closed by a flange and comprising a gasket according to the invention. DETAILED DESCRIPTION

[0067] Figure 1Part of a high-voltage device is shown, which includes components 10 assembled to each other. Here, each component 10 is represented as a cylindrical and tubular component. It will be understood that the gasket 14, 14' or the compression sealing gasket according to the present invention, or the sealing gasket, or the sealing gasket system, or the sealing system, or the compression sealing gasket system is suitable for Figure 1 The invention may be applied to a cylindrical member on the surface of the invention, or alternatively, to a member that may be of any other shape, including, for example:

[0068] - non-cylindrical tubular portion;

[0069] - or a non-tubular part, such as a hole 100 of a gas compartment closed by a flange 101 ( Figure 6 ); the end face 111 of the flange faces the assembly face 102 of the gas compartment, and the assembly face 102 includes a recess 16 to receive the gasket 14; alternatively, the recess may be partially or completely formed in the flange 101.

[0070] Alternatively, the gasket, or compression sealing gasket, or sealing gasket, or sealing gasket system, or sealing system, or compression sealing gasket system according to the invention may be used, for example, at the interface between two flanges.

[0071] The following description is made with reference to tubular elements, but the invention is applicable to any other pair of elements whose interface must be sealed, in particular with respect to:

[0072] - gases which may be mixed with a gas or diluent gas comprising at least CO2 and / or O2 and / or N2 and / or and / or an oxygen-containing compound, such as heptafluoroisobutyronitrile and / or heptafluoroisopropyltrifluoromethylketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7));

[0073] - or a gas comprising at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound;

[0074] - and / or incoming water and / or water vapor, said interface being surrounded or intended to be surrounded by an external atmosphere containing some water and / or water vapor.

[0075] The gas may have a pressure between 1 bar and 20 bar, for example 5 bar or 15 bar.

[0076] In the following description, the presented elements will be designated as members 10 , 10 ′.

[0077] The components 10 , 10 ′ extend coaxially with respect to a main axis AA′ of the high-voltage installation.

[0078] If available Figure 2A and 2BAs seen in more detail in FIG. 1 , each component 10 includes an end face or assembly face 12 that faces toward and is connected to an end face or assembly face 12 ′ of another component 10 ′.

[0079] The gasket or sealing system for connecting the components 10, 10' comprises a gasket of annular general shape, or a sealing gasket, or a compression sealing gasket 14, 14', or a compression sealing gasket or a sealing gasket or a sealing gasket system or a compression sealing gasket system, arranged axially between the end faces or assembly faces 12, 12' of the two components 10, 10'. The gasket or sealing system 14, 14' extends substantially in a plane perpendicular to the axis AA'. In this example and in most of the examples below, the gasket has circular symmetry around the axis AA'.

[0080] The sealing gasket or system comprises fastening means 30 , such as bolt connection means, which axially press one component 10 towards the other component 10 ′.

[0081] The fastening means 30 also axially compresses the sealing gaskets 14 , 14 ′ to provide a gas-tight connection between the two components 10 , 10 ′.

[0082] according to Figure 2A In the first embodiment presented above, the end face or assembly face 12 , 12 ′ of each member 10 , 10 ′ comprises an annular recess 16 in which a portion of the sealing gasket 14 , 14 ′ is received.

[0083] Before assembly of the two components 10, 10', the axial depth of the recess 16 is less than half the axial height of the gasket 14, 14'. As a result, before final assembly of the components 10, 10', the gasket 14, 14' protrudes axially from the end face or assembly face 12, 12' of each component 10, 10'.

[0084] according to Figure 2B In another embodiment shown above, the washers 14 , 14 ′ contact the end faces or assembly faces 12 , 12 ′ of the two members 10 , 10 ′ and maintain the end faces or assembly faces 12 , 12 ′ away from each other.

[0085] The compression of the washers 14 , 14 ′ by the fastening means 30 produces an axial deformation of the washers 14 , 14 ′ and maintains an effective pressure of the washers 14 , 14 ′ on the end or assembly faces 12 , 12 ′ and against the walls and the bottom of the recess 16 .

[0086] The gasket 14 , 14 ′ comprises a body or main body 18 , 38 made of a single material, such as an elastomer such as, by way of non-limiting example, unmodified butyl rubber or a modified butyl rubber such as chlorobutyl rubber (CIIR) or bromobutyl rubber.

[0087] The permeability of this elastomer with respect to the gas intended to fill the member 10 leads to a loss of gas over time.

[0088] If available Figure 3 and Figure 4 The cross-section of the body 18, 38 of the gasket 14 along an axial plane containing the main axis AA', seen from above, may be of generally rectangular shape. Alternatively, it may have the cross-section of an "O" ring or a circular cross-section.

[0089] The body 18 , 38 of the gasket 14 , 14 ′ then comprises an annular radial outer face 20 , 30 , an annular radial inner face 22 , 32 and two planar annular end faces 24 , 26 , 34 , 36 axially delimiting the gasket 14 , 14 ′ and connecting the inner face 22 , 32 to the outer face 20 , 30 .

[0090] According to a preferred embodiment, the faces 20, 22, 24 ( Figure 3 ) is wavy to enhance the seal. The wavy shape includes at least one protrusion or peak 24a and at least one concave or recess or valley 24b, 24c. Due to this complex shape, the air pressure has a positive effect: it increases the compression rate, and the pressure pushes the gasket towards the groove.

[0091] The surfaces 20, 22, 24 may have different shapes or be straight lines, such as Figure 4 Alternatively, the gasket has the shape of an "O" ring, which also has an inner face and an outer face.

[0092] The inner part of the device in which the gasket according to the invention is implemented generally has the highest pressure P2 under the conditions of use (the outer pressure of the device is P1). <P2)。

[0093] To reduce the permeability of the gasket 14 with respect to:

[0094] *gases, for example gases at pressure P2, such as heptafluoroisobutyronitrile and / or heptafluoroisopropyltrifluoromethylketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7)) and / or CO2 and / or O2 and / or N2 and / or water vapour,

[0095] * and / or ingress of water and / or water vapor,

[0096] At least one of the inner face 22 , 32 and the outer face 21 , 31 comprises a first thin layer 23 .

[0097] Preferably, the thin layer has a thickness between 1 nm and 1 mm. It therefore requires only a small amount of material.

[0098] The thin layer may be made of or include a metal or soft metal deposited, for example, by a spraying technique; such a technique may involve, for example, spraying two aerosols in an aqueous phase, which will form a liquid film in which a redox reaction occurs after contact with the workpiece. This chemical reaction forms a uniform and homogeneous metal layer over the surface area of ​​the workpiece.

[0099] The metal or soft metal may be selected, for example, from Ag, Al2O3, tin, copper, gold, iron or a mixture of these elements and / or any oxides of these elements.

[0100] Alternatively, the first thin layer 23 may be made of or include PTFE, with or without an electric charge.

[0101] Both the inner face 22,32 and the outer face 20,30 may comprise thin layers 21,23, each made of or comprising a metal or soft metal (e.g. from the above list) or PTFE. Preferably, at least one or both of said thin layers 21,23 have a thickness between 1 nm and 1 mm, for example 300 nm or 1 μm.

[0102] For example, each of the inner and outer faces has a 300 nm Ag layer.

[0103] At least one of the planar end faces 24, 26, 34, 36 may be partially or completely covered by a thin layer made of or comprising a metal or soft metal (e.g. from the above list) or PTFE. Preferably, the thin layer has a thickness between 1 nm and 1 mm. This enhances the tightness of the gasket to any of the gases mentioned above.

[0104] Figure 5A is a front view of a circular or annular gasket according to the invention, in a plane perpendicular to the axis (AA'). It has an internal diameter D1 which may for example be comprised between 30 mm and 1300 mm.

[0105] Alternatively, the gasket according to the invention also extends in a plane perpendicular to the axis (AA'), but has an elongated or oval or elliptical shape ( Figure 5B ); it has a maximum internal dimension D2 which may, for example, be comprised between 30 mm and 1300 mm.

[0106] exist Figure 5A and 5B On both, the radially inner face carries a thin metal layer 23 according to the invention. The axis AA' is perpendicular to Figure 5A and Figure 5B Each of the .

[0107] As already mentioned, in an axial plane containing the main axis AA′, the body of the gasket may have the shape of an “O” ring.

[0108] The present invention is applicable, for example, to a switch, or to a circuit breaker, or to an isolating switch, or to a transformer, or to a surge arrester, or to a gas-isolated line . . .

Claims

1. A sealing system comprising two components (10, 10') which are parts of a high-pressure or medium-pressure device containing a gas, wherein each of the components (10, 10') comprises an end face or assembly face (12) facing an end face or assembly face (12) of the other component (10), and wherein a compression sealing gasket (14, 14') is compressed between the end faces or assembly faces (12, 12') of the components (10, 10'), the compression sealing gasket (14, 14') comprising a body (18, 38) made of an elastomeric material and comprising a radial outer face (20, 30) and a radial inner face (22, 32) coaxial with each other, At least one of the radially outer face (20, 30) and the radially inner face (22, 32) comprises at least one first thin layer (23, 33) made of metal or soft metal or PTFE and having a thickness between 1 nm and 1 mm.

2. The sealing system according to claim 1, wherein: The first thin layer at least partially covers at least one of the radially outer surface (20, 30) and the radially inner surface (22, 32).

3. A sealing system according to any one of claims 1 or 2, wherein: The body (18, 38) further comprises end surfaces (24, 26, 34, 36) connecting the inner surface and the outer surface, and at least one of the end surfaces comprises a second thin layer of metal or soft metal or PTFE.

4. The sealing system of claim 3, wherein: - the first thin layer completely covers the radially outer face (20, 30), and a thin layer made of metal or soft metal or PTFE and having a thickness between 1 nm and 1 mm partially covers the inner face (22, 32); - or the first thin layer partially covers the radially outer face (20, 30), and a thin layer made of metal or soft metal or PTFE and having a thickness between 1 nm and 1 mm completely covers the inner face (22, 32).

5. A sealing system according to claim 3 or claim 4, wherein: The second thin layer has a thickness between 1 nm and 1 μm.

6. The sealing system according to any one of claims 1 to 5, wherein: The first thin layer and / or the second thin layer are made of metal or soft metal, and the metal or soft metal is selected from Ag, Al2O3, tin, copper, gold, iron or a mixture of these elements and / or any oxides of these elements.

7. The sealing system according to any one of claims 1 to 6, wherein: The radially outer surface (20, 30) and the radially inner surface (22, 32) are parallel and / or coaxial with each other.

8. The sealing system according to any one of claims 1 to 6, wherein: - at least one of the radially outer surface (20, 30) and the radially inner surface (22) has a wavy shape; - and / or the sealing system further comprises end faces (24, 26, 34, 36), at least one of the end faces (24, 26, 34, 36) having a wave shape.

9. The sealing system according to any one of claims 1 to 8, wherein: The first thin layer (23, 33) is made of or includes metal or soft metal, has a thickness between 1 nm and 1 mm, and is covered by a protective layer, for example a thin layer made of or includes metal or soft metal or PTFE.

10. The sealing system according to any one of claims 1 to 9, wherein: The components (10, 10') are at least partially cylindrical and are arranged coaxially with each other and with a main axis (AA'), the end or assembly face (12, 12') of each component extending in a plane perpendicular to the main axis (AA').

11. The sealing system of claim 10, wherein: At least one of the end or assembly faces (12, 12') comprises an annular recess (16) in which the compression sealing gasket (14, 14') is fitted.

12. The sealing system according to any one of claims 1 to 11, wherein: The gasket (14, 14') is axially compressed by the end or assembly face (12, 12').

13. A method for isolating a gas-isolated section of a high- or medium-voltage installation, the gas-isolated section: * containing a gas which may be mixed with a diluent gas comprising CO2 and / or O2 and / or N2 and / or an oxygen-containing compound, such as heptafluoroisobutyronitrile or heptafluoroisopropyltrifluoromethylketone (also known as 1,1,1,3,4,4,4-heptafluoro-3-(trifluoromethyl)-2-butanone (CAS No. 756-12-7)), or the portion containing a gas comprising at least CO2 and / or O2 and / or N2 and / or an oxygen-containing compound and / or water vapor, * and / or the gas-insulated portion is surrounded, or is intended to be surrounded, by an atmosphere containing some water and / or water vapour, The device and / or the gas isolation part comprises a sealing system according to any one of claims 1 to 11, or comprises two components (10, 10'), wherein each of the components (10, 10') comprises an end face or assembly surface (12, 12') facing the end face or assembly surface (12', 12) of the other component (10), and wherein a compression sealing gasket (14, 14') according to any one of claims 1 to 9 is arranged and compressed between the end faces or assembly surfaces (12, 12') of the components (10, 10').

14. The method according to claim 13, wherein: The gas is contained in the device at a pressure (P2) between 1 and 20 bar.

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