Protection system and associated process

Abstract

The invention relates to a protection system (1) for mounting on at least one conduit (C) to protect a protected area of ​​said at least one conduit (C). The protection system (1) comprises a flexible protective blanket (10) configured to form, in the mounted state, a first closed enclosure (13) encompassing the protected area and into which a protective agent (11) can be introduced; and a flexible containment blanket (30) configured to form, with an external surface (se10) of the protective blanket (10) and in the mounted state, a second closed enclosure (33) that at least partially encompasses the protective blanket (10) at the level of the protected area, and into which the expanding agent (31) can be introduced. The invention also relates to a method of protecting a protected area of ​​at least one conduit (C) by such a protection system (1). Figure 1

Description

Title of the invention: Protection system and associated method Technical field of the invention

[0001] The invention relates to a system for protecting an area to be protected by at least one conduit. Generally, the invention applies to fluid networks, such as gas or water networks, but can also be applied to electrical or information networks comprising conduits.

[0002] The invention also relates to a method of protecting such an area to be protected from a conduit. State of the art

[0003] In the field of conduit networks, and more particularly fluid conduits, it is frequently necessary to carry out operations to join at least two conduits together, for example at a junction or fitting, or simply to locally repair a damaged conduit. Such operations may notably concern cables or pipes located below or above ground level.

[0004] In practice, certain areas of these networks are more vulnerable to external damage and must therefore be protected. This applies, for example, to a damaged section of a conduit, or a connection point between two or more conduits, typically forming a fitting or branch. After the intervention, the area in question must be protected again, in terms of sealing, electrical insulation, and protection against corrosion and mechanical shocks. Indeed, it is not uncommon for the area in question to be subjected to an impact or welded during installation or maintenance operations. In this case, certain parts of the conduit material may be weakened.

[0005] To solve this problem, it is known in the prior art to place a flexible barrier around the area to be protected and to introduce a filling fluid to fill the space between the water table and the area to be protected. Such a filling fluid generally serves to ensure mechanical rigidity and to provide a seal, in particular to prevent short circuits, leaks, or corrosion.

[0006] To improve the quality of the assembly, it is generally planned to apply appropriate circumferential tightening of the protective wall around the area to be protected. Various solutions have been proposed for this purpose, such as tightening using straps with which an operator wraps and locally tightens the wall. Alternatively, it is sometimes proposed to provide a rigid shell shaped to fit the area to be protected and then introduce the filling fluid into it.

[0007] Although these solutions are satisfactory in that they allow the protection of said areas, these clamping solutions have a number of disadvantages, in terms of the time required for implementation, the effort required, availability, and cost.

[0008] Indeed, the use of a rigid shell requires the user to have a specific wall for each area to be protected. With flexible walls, this problem is less pronounced; however, in the case of large areas, under the pressure of the filling fluid, bulges generally appear between two adjacent tightening straps. This leads to the use of an unnecessarily large volume of filling fluid, which is costly. Furthermore, such bulges, in addition to the degraded appearance they give to the protection system, which is detrimental to the overall impression of quality, can generate localized stresses within the wall, potentially weakening the protection system over time.Finally, in the case of large areas, the introduced filling fluid can concentrate by gravity at the bottom of the protection system, forming a significant volume of fluid that can damage the wall, particularly through its weight or heating.

[0009] Object of the invention

[0010] The present invention aims to provide a solution that addresses all or part of the aforementioned problems.

[0011] This objective can be achieved through the implementation of a protection system intended to be mounted on at least one conduit to protect an area to be protected on said at least one conduit, the protection system comprising: - a flexible protective sheet, comprising a material impermeable to a protective agent of the protection system, said protective sheet being configured to form, in the assembled state, a first closed enclosure which encompasses the area to be protected and into which the protective agent can be introduced; - a spacing device disposed, in the mounted state, in the first closed enclosure of the protective layer, said spacing device being configured to prevent direct contact between the protective layer and the conduit at the level of the area to be protected; - a flexible containment blanket, disposed on the side opposite the spreading device relative to the protective blanket, said containment blanket comprising a material impermeable to an expanding agent of the protection system, said containment blanket being configured to form, with an external surface of the protective blanket and in the assembled state, a second closed enclosure which at least partially encloses the blanket protection at the level of the area to be protected, and into which the expanding agent can be introduced.

[0012] The arrangements described above allow for a double-walled protection system, the first wall being formed by the protective layer, and the second wall being formed by the containment layer. The protective layer can then provide a watertight seal for the area to be protected by means of the protective agent, and the containment layer can limit the expansion of the protective layer when the second layer is filled with the expanding agent. The protection system is therefore effective in preventing potential corrosion of the fluid conduit.

[0013] Advantageously, the use of a flexible protective mat and a flexible containment mat allows the protection system to be adapted to any type of conduit, in particular to fittings with complex shapes or large dimensions.

[0014] It is therefore clearly understood that the spacer is configured to move the protective layer away from the area to be protected, particularly when the spacer is compressed by the protective layer towards the area to be protected. Thus, the spacer ensures the presence of a gap between the protective layer and the conduit.

[0015] The protection system may also have one or more of the following characteristics, taken alone or in combination.

[0016] Generally speaking, the conduit is a fluid conduit.

[0017] By conduits to be protected, we generally mean conduit fittings or junctions.

[0018] By "mounted state" is meant a configuration in which the protection system is installed on the conduit at the level of the area to be protected.

[0019] According to one embodiment, the protective agent comprises a filling fluid.

[0020] According to one embodiment, the spreading member comprises a compressible layer that is permeable to the protective agent.

[0021] In this way, the spreading member allows both the protective sheet to be moved away from the area to be protected, while allowing the introduction of the protective agent into the first enclosure, so as to ensure effective protection of the area to be protected.

[0022] According to one embodiment, the layer of the spacer forms a lining of the first closed enclosure and has a thickness sufficient to guarantee a non-zero minimum gap between the protective layer and the conduit at every point in the area to be protected

[0023] Thus, the layer makes it possible to guarantee a thickness between the conduit and the protective layer when the spreading member is compressed by the protective layer towards the area to be protected.

[0024] According to one embodiment, the layer of the spreading member comprises an open-cell foam, an alveolar material, or a mesh.

[0025] According to one embodiment, the spreading member comprises at least one return element such as a spring configured to spread the sheet

[0026] According to one embodiment, the protective agent comprises a filling fluid configured to form, with the spreading member, a rigid protective layer, when said filling fluid is introduced into the first enclosure.

[0027] Thus, the combination of the protective agent and the spacer makes it possible to form a protective layer, and possibly a watertight layer, in the area to be protected. By "rigid," it is understood that the protective layer has a hardness greater than or equal to, within 10%, that of the conduit.

[0028] According to one embodiment, the protective agent comprises a resin configured to harden.

[0029] Thus, it is possible to introduce the protective agent into the first enclosure when the resin is in a fluid state, and to harden the resin thus introduced to form a rigid protective layer around the area to be protected.

[0030] According to one embodiment, the resin is a thermosetting resin.

[0031] According to one embodiment, the resin is configured to harden by reaction chemical, for example by reaction with a hardening agent.

[0032] According to one embodiment, the resin is an epoxy resin.

[0033] According to one embodiment, the expanding agent comprises an expandable foam.

[0034] Thus, it is possible to introduce the expanding foam into the second enclosure, and to let it expand so that it completely, or at least 90%, fills the volume of the second enclosure.

[0035] According to one embodiment, the expanding agent comprises a fluid placed under pressure in the second enclosure. In this case, it is advantageous to provide that both the protective layer and the containment layer are impermeable to the expanding agent.

[0036] According to one embodiment, in the assembled state, the containment layer is integral with the protection layer.

[0037] Thus, the installation of the protection system is faster and simpler.

[0038] According to one embodiment, the protection system further includes introduction channels allowing the protection agent to be introduced into the first enclosure and / or the expanding agent to be introduced into the second enclosure.

[0039] Thus, the introduction of the protecting agent into the first enclosure and / or the introduction of the expanding agent into the second enclosure is facilitated.

[0040] According to one embodiment, the inlet channels include valves.

[0041] According to one embodiment, the protection system includes vents configured to allow the evacuation of any air contained in the first enclosure during the introduction of the protective agent.

[0042] According to one embodiment, the inlet channels form the vents.

[0043] According to one embodiment, at least one tablecloth selected from the tablecloth of protection and the containment blanket includes a closure device configured to vary said at least one blanket between an open configuration, in which the first enclosure and / or the second enclosure is open, and a closed configuration, in which said at least one blanket encompasses the area to be protected.

[0044] In this way, the sheets can be in the open configuration to install them around the area to be protected, and can be closed by the user to put them in the mounted state in the closed configuration, and thus form the first enclosure and / or the second enclosure.

[0045] According to one embodiment, the closure device includes a zipper, snap fasteners, Velcro, or any other equivalent system.

[0046] The object of the invention can also be achieved by implementing a method for protecting an area to be protected from at least one conduit, the protection method comprising: - a step of making available a protection system as described above; - a phase of setting up the protection system including: • a first installation stage in which the spreading device is placed around the area to be protected; • a second installation stage, in which the protective sheet is installed around the spreading member, so as to form the first enclosure in which the spreading member is contained; • a third installation stage, in which the containment blanket is installed around the protective blanket, so as to form the second enclosure; - an expansion stage, in which the expanding agent is introduced into the second enclosure, and expands within the second enclosure, so as to form a containment wall in which the first enclosure is contained; - a protection stage, in which the protective agent is introduced into the first enclosure and confined within the first enclosure by compression between the containment wall and the area to be protected of the conduit, the protective agent forming with the spacing element, a protective layer of the area to be protected.

[0047] The provisions described above allow for a protection method in which the quantity of protective agent to be used is minimal and sufficient to protect the area of ​​the fluid conduit to be protected. Furthermore, the use of flexible mats facilitates the installation of the protection system before the introduction of the expanding agent and the protective agent.

[0048] The protection method may also have one or more of the following characteristics, taken alone or in combination.

[0049] In general, the protective layer is fluid-tight.

[0050] According to one embodiment, the second installation step and the third installation step are carried out simultaneously.

[0051] Thus, the implementation of the protection system is simpler and faster.

[0052] According to one embodiment, the protection step further comprises, a hardening of the protective agent following its introduction into the first enclosure.

[0053] In this way, it is possible to form a rigid protective layer around the area to be protected, which makes it possible to ensure both good protection against corrosion while also providing mechanical reinforcement of the protective layer.

[0054] Summary description of the drawings

[0055] Other aspects, objectives, advantages and features of the invention will become clearer upon reading the following detailed description of preferred embodiments thereof, given by way of non-limiting example, and made with reference to the accompanying drawings in which:

[0056] [Fig-1] Fig. 1 is a schematic perspective view of a protection system according to a particular embodiment of the invention, mounted on a conduit.

[0057] [Fig.2] Fig.2 is a schematic cross-sectional view of the protection system of the [Fig.1], mounted on a conduit.

[0058] [Fig. 3] [Fig. 3] is a schematic perspective view of a protection system according to another particular embodiment of the invention, mounted on a conduit.

[0059] [Fig.4] Fig.4 is a schematic view of the different stages of the process of protection according to a particular embodiment of the invention. Detailed description

[0060] In the figures and throughout the description, the same reference numerals represent identical or similar elements. Furthermore, the various elements are not drawn to scale in order to enhance the clarity of the figures. Moreover, the different embodiments and variants are not mutually exclusive and may be combined.

[0061] As can be seen in Figures 1 to 3, the invention relates to a protection system 1 intended to be mounted on at least one conduit, denoted "C", to protect a protected area of ​​said at least one conduit C. Generally, conduit C is a fluid conduit, such as a liquid or gas conduit. However, it is understood that such an application is not limiting and that the invention can be adapted to any other type of conduit that would require protection. By conduits to be protected, one generally means fittings or junctions of conduits, which are potentially more fragile elements of a conduit.

[0062] The protection system 1 comprises, firstly, a flexible protective sheet 10. By "flexible" is meant that the protective sheet 10 has the capacity to be conformed around the conduit C to be protected by a change in its shape by a user of the protective sheet 10, without excessive effort and without requiring any special tools. The protective sheet 10 therefore has greater flexibility than the conduit C to be protected. The protective sheet 10 comprises a material impermeable to a protective agent 11 of the protection system 1. In other words, the material of the protective sheet 10 is such that it prevents the passage of the protective agent 11 through a layer of the protective sheet 10. For example, the material of the protective sheet 10 may be a synthetic fabric such as polyurethane-coated nylon.

[0063] As can be seen in the figures, the protective mat 10 is configured to form, in its assembled state, a first closed enclosure 13 that encompasses the area to be protected and into which the protective agent 11 can be introduced. "Assembled state" refers to a configuration in which the protection system 1 is installed on the conduit C at the level of the area to be protected. Advantageously, the use of a flexible protective mat 10 allows the protection system 1 to be adapted to any type of conduit C, including connections with complex shapes or large dimensions.

[0064] The protection system 1 also includes a spacer 20 disposed, in its mounted state, within the first closed enclosure 13 of the protective layer 10. It is therefore understood that the spacer 20 is disposed on the conduit C to be protected, and that the protective layer 10, in its mounted state, covers the spacer 20. Thus, the spacer 20 is configured to prevent direct contact between the protective layer 10 and the conduit C at the level of the area to be protected. In other The spacer 20 is configured to move the protective layer 10 away from the area to be protected, particularly when the spacer 20 is compressed by the protective layer 10 towards the area to be protected. Thus, the spacer 20 ensures the presence of a gap, or thickness, between the protective layer 10 and the conduit C.

[0065] Generally, the spacer 20 comprises a compressible layer permeable to the protective agent 11, such as an open-cell foam, a cellular material, or a mesh. In this way, the spacer 20 allows both the protective sheet 10 to be moved away from the area to be protected, while simultaneously allowing the protective agent 11 to be introduced into the first enclosure 13, so as to ensure effective protection of the area to be protected. The layer of the spacer 20 can advantageously form a lining for the first closed enclosure 13, and can have a thickness sufficient to guarantee a non-zero minimum gap between the protective sheet 10 and the conduit C at any point in the area to be protected. Thus, the layer ensures a thickness between the conduit C and the protective sheet 10 when the spacer 20 is compressed by the protective sheet 10 towards the area to be protected.

[0066] According to another variant not shown, it is possible that the spreading member 20 includes at least one return element, such as a spring, configured to spread the protective sheet 10 away from the conduit C.

[0067] The protection system 1 further comprises a flexible containment blanket 30, located on the opposite side of the protective blanket 10 from the spacer 20. "Flexible" means that the containment blanket 30 can be shaped around the conduit C to be protected by a user of the containment blanket 30, without excessive effort and without requiring any special tools. The containment blanket 30 therefore has greater flexibility than the conduit C to be protected. It is thus understood that, in its assembled state, the protection system 1 comprises, from the protective conduit: the spacer 20, then the protective blanket 10, and finally the containment blanket 30, which is radially furthest from the conduit C.

[0068] The containment blanket 30 comprises a material impermeable to an expanding agent 31 of the protection system 1. In other words, the material of the containment blanket 30 is such that it prevents the passage of the containment agent 31 through a thickness of the containment blanket 30. For example, the material of the containment blanket 30 may be a synthetic fabric such as polyurethane-coated nylon. Advantageously, the use of a flexible containment blanket 30 makes it possible to adapt the protection system 1 to any type of conduit C, in particular to fittings with complex shapes or large dimensions.

[0069] The containment mat 30 being configured to form, with an external surface selO of the protection mat 10 and in the mounted state, a second closed enclosure 33 which at least partially encompasses the protection mat 10 at the level of the area to be protected, and into which the expanding agent 31 can be introduced.

[0070] Although not limiting, it is advantageous to provide that, whether mounted or not, the containment mat 30 is attached to the protection mat 10. Thus, the installation of the protection system 1 is faster and simpler.

[0071] As illustrated in Figures 2 and 3, one or both of the protective blanket 10 and the containment blanket 30 include a closure device 17, 37. The closure device 17, 37 is configured to vary said at least one blanket between an open configuration, in which the first enclosure 13 and / or the second enclosure 33 is open, and a closed configuration, in which said at least one blanket encompasses the area to be protected. The closure devices 17, 37 are particularly advantageous for placing the protection system 1 in the mounted state on the conduit C, especially when the protective blanket 10 and the containment blanket 30 are joined. Indeed, the protective blanket 10 can be positioned around the conduit C when the closure device 17 of the protective blanket 10 is open, thus opening the first enclosure 13 in which the area to be protected is located.The closing device 17 of the protective sheet 10 can then be closed to close the first enclosure 13, and thus place the protective sheet 10 in the mounted state, around the area to be protected of the conduit C.

[0072] The same operation can be applied to the containment mat 30, and to the closure device 37 of the containment mat 30 to place it around the area to be protected and thus close the second enclosure 33. In other words, the mats 10, 30 can be in the open configuration to install them around the area to be protected, and can be closed by the user to put them in the mounted state in the closed configuration, and thus form the first enclosure 13 and / or the second enclosure 33.

[0073] According to one embodiment, the closure device 17, 37 comprises a zipper, snap fasteners, Velcro, or any other equivalent system.

[0074] According to the non-limiting embodiment illustrated in Figures 2 and 3, the protection system 1 may further include inlet channels 15, 35 for introducing the protective agent 11 into the first enclosure 13 and / or the expanding agent 31 into the second enclosure 33. Thus, the introduction of the protective agent 11 into the first enclosure 13 and / or the introduction of the expanding agent 31 into the second enclosure 33 is facilitated. For example, the inlet channels 15, 35 include valves. Furthermore, the protection system 1 may include vents configured to allow air to escape. possibly contained in the first enclosure 13 during the introduction of the protective agent 11. It is also possible that the introduction channels 15, 35 form the vents.

[0075] More specifically, the containment blanket 30 may include channels 35 for introducing the expanding agent 31 into the second enclosure 33. The expanding agent 31 may, for example, include an expandable foam that can be introduced into the second enclosure 33 through the channels 35. The expanding agent 31 can then expand to completely, or at least 90%, fill the volume of the second enclosure 33. Thus, the containment blanket 30 is pushed radially to the side opposite the conduit C, and the external surface selO of the protective blanket 10 is pushed radially towards the spacer 20 during the expansion of the expanding agent 31. The spacer 20 then makes it possible to maintain a first enclosure 13 having a non-zero volume by keeping the protective blanket 10 away from the area to be protected. Alternatively, it is possible that the expanding agent 31 comprises a fluid placed under pressure in the second enclosure 33.In this case, it is advantageous to ensure that both the protective layer 10 and the containment layer 30 are impermeable to the expanding agent 31. The displacement resulting from the introduction of said fluid under pressure is therefore the same as in the case of using an expanding foam.

[0076] The protective layer 10 may include channels 15 for introducing the protective agent 11. For example, the protective agent 11 may include a filling fluid. More specifically, the protective agent 11 may include a resin configured to harden, such as a thermosetting resin, a resin configured to harden by chemical reaction, for example by reaction with a hardening agent, or an epoxy resin. Thus, it is possible to introduce the protective agent 11 into the first enclosure 13 when the resin is in a fluid state, and to harden the resin thus introduced to form a rigid protective layer around the area to be protected.

[0077] Regardless of the filling fluid used as a protective agent 11, it can be configured to form, together with the spacer 20, a rigid protective layer when said filling fluid is introduced into the first chamber 13. Thus, the combination of the protective agent 11 and the spacer 20 makes it possible to form a protective layer, and possibly a watertight layer, in the area to be protected. By "rigid," it is understood that the protective layer has a hardness greater than or equal to, within 10%, that of the conduit C.

[0078] The arrangements described above make it possible to propose a double-envelope protection system 1, the first envelope being formed by the protection layer 10, and the second envelope being formed by the containment layer 30. The protective layer 10 can then provide a watertight seal for the area to be protected by means of the protective agent 11, and the containment layer 30 can limit the expansion of the protective layer 10 when the second enclosure 33 is filled by the expanding agent 31. The protection system 1 is therefore effective in combating possible corrosion of the fluid conduit C.

[0079] Now with reference to [Fig.4], the invention also relates to a method of protecting an area to be protected from at least one conduit C.

[0080] The protection method first includes a step of making available El a protection system 1 as described above.

[0081] A setup phase P2 of the protection system 1 can then be implemented and includes, firstly, an initial installation step E21 in which the spacer 20 is positioned around the area to be protected. As can be seen in [Fig. 4], the spacer 20 may be held in place by ties or elastic bands around the area to be protected.

[0082] The installation phase P2 then comprises a second installation step E22, in which the protective sheet 10 is installed around the spacer 20, so as to form the first enclosure 13 in which the spacer 20 is contained. As previously mentioned, this step can be facilitated by the use of a closure device 17 for the protective sheet 10. Simultaneously or successively, the installation phase P2 comprises a third installation step E23, in which the containment sheet 30 is installed around the protective sheet 10, so as to form the second enclosure 33. As with the protective sheet 10, this step is facilitated by the use of a closure device 37 for the containment sheet 30. Thus, the installation of the protection system 1 is simpler and faster.

[0083] Next, the protection method includes an expansion step E3, in which the expanding agent 31 is introduced into the second enclosure 33 and expands within it, forming a containment wall in which the first enclosure 13 is contained. For example, the expansion step is carried out by introducing the expanding agent 31 through the inlet channels 35 of the containment layer 30. The action of the expanding agent 31 in the second enclosure 33 causes an increase in the volume enclosed by the second enclosure 33. This increase is limited on one side by the containment layer 30 and on the other side by the external surface 10 of the protective layer 10.

[0084] The protection method finally includes a protection step E4, in which the protective agent 11 is introduced into the first enclosure 13 and confined within the first enclosure 13 by compression between the containment wall and the area to be protected of the conduit C, the protective agent 11 forming with the spacing element, a protective layer of the area to be protected. According to a non-limiting variant, the protection step E4 may include a hardening of the protective agent 11 following its introduction into the first enclosure 13. In this way, it is possible to form a rigid protective layer around the area to be protected, which makes it possible both to ensure good protection against corrosion and to provide mechanical reinforcement of the protective layer.

[0085] The provisions described above allow for a protection method in which the quantity of protective agent 11 to be used is minimal and sufficient to protect the area to be protected of the fluid conduit C. Furthermore, the use of flexible mats facilitates the installation of the protection system 1 before the introduction of the expanding agent 31 and the protective agent 11.

Claims

Demands

1. A protection system (1) intended to be mounted on at least one conduit (C) to protect an area to be protected on said at least one conduit (C), the protection system (1) comprising: • a flexible protective blanket (10), comprising a material impermeable to a protective agent (11) of the protection system (1), said protective blanket (10) being configured to form, in the mounted state, a first closed enclosure (13) which encompasses the area to be protected and into which the protective agent (11) can be introduced; • a spacer (20) disposed, in the mounted state, in the first closed enclosure (13) of the protective blanket (10), said spacer (20) being configured to prevent direct contact between the protective blanket (10) and the conduit (C) at the level of the area to be protected;• a flexible containment blanket (30), disposed on the side opposite the spreading member (20) to the protective blanket (10), said containment blanket (30) comprising a material impermeable to an expanding agent (31) of the protection system (1), said containment blanket (30) being configured to form, with an external surface (selO) of the protective blanket (10) and in the assembled state, a second closed enclosure (33) which at least partially encompasses the protective blanket (10) at the level of the area to be protected, and into which the expanding agent (31) can be introduced; protection system (1) in which the spreading member (20) has a compressible layer permeable to the protective agent (11).

2. A protection system (1) according to claim 1, wherein the layer of the spacer element (20) forms a lining of the first closed enclosure (13), and has a thickness sufficient to guarantee a non-zero minimum gap between the protective layer (10) and the conduit (C) at every point of the area to be protected

3. A protection system (1) according to any one of claims 1 or 2, wherein the protecting agent (11) comprises a fluid of filling configured to form, with the spreading member (20), a rigid protective layer, when said filling fluid is introduced into the first enclosure (13).

4. A protection system (1) according to any one of claims 1 to 3, wherein the protection agent (11) comprises a resin configured to harden.

5. Protection system (1) according to any one of claims 1 to 4, wherein the expanding agent (31) comprises an expandable foam.

6. Protection system (1) according to any one of claims 1 to 5, wherein, in the assembled state, the containment mat (30) is integral with the protection mat (10).

7. A protection system (1) according to any one of claims 1 to 6, further comprising introduction channels (15, 35) for introducing the protection agent (11) into the first enclosure (13) and / or for introducing the expanding agent (31) into the second enclosure (33).

8. Protection system (1) according to any one of claims 1 to 7, wherein at least one layer selected from the protection layer (10) and the containment layer (30) comprises a closure device (17, 37) configured to vary said at least one layer between an open configuration, in which the first enclosure (13) and / or the second enclosure (33) is open, and a closed configuration, in which said at least one layer encompasses the area to be protected.

9. A method for protecting an area to be protected from at least one conduit (C), the protection method comprising: • a step of providing (E1) a protection system (1) according to any one of claims 1 to 8; • a phase of installing (P2) the protection system (1) comprising: • a first installation step (E21) in which the spacer (20) is arranged around the area to be protected; • a second installation step (E22) in which the protective blanket (10) is installed

10.

11. around the spreading member (20), so as to form the first enclosure (13) in which the spreading member (20) is contained; • a third installation stage (E23), in which the containment blanket (30) is installed around the protection blanket (10), so as to form the second enclosure (33); • an expansion step (E3), in which the expanding agent (31) is introduced into the second enclosure (33), and expands into the second enclosure (33), so as to form a containment wall in which the first enclosure (13) is contained; • a protection step (E4), in which the protective agent (11) is introduced into the first enclosure (13) and confined within the first enclosure (13) by compression between the containment wall and the area to be protected of the conduit (C), the protective agent (11) forming with the spacer, a protective layer of the area to be protected. A protection method according to claim 9, wherein the second installation step (E22) and the third installation step (E23) are carried out simultaneously. A protection method according to any one of claims 9 or 10, wherein the protection step (E4) further comprises a hardening of the protection agent (11) following its introduction into the first enclosure (13).

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