Endothermic module and passive fire protection device comprising such a module.

Abstract

The present invention relates to an endothermic module (1) for a device for wrapping and providing passive fire protection for an element to be protected. This module is remarkable in that it extends along a longitudinal axis (X-X'), in that it comprises two rectangular strips (11, 12) of a fire-resistant blocked mesh fabric, in that the two strips (11, 12) of fabric are assembled so that their respective long sides are parallel to the longitudinal axis (X-X') of the module (1) and are sewn together to form a plurality of closed storage pockets (13), of oblong shape and longitudinal axis (Y-Y'), these storage pockets (13) being parallel to each other along their longitudinal sides, and the longitudinal axes (Y-Y') of these storage pockets (13) being perpendicular to the longitudinal axis (X-X') of the endothermic module (1), and in that at least one of these storage pockets (13) is filled with an endothermic material (100) in the form powdery.Figure for abstract: Fig. 2.

Description

Title of the invention: Endothermic module and passive fire protection device comprising such a module. FIELD OF THE INVENTION

[0001] The invention lies in the field of fire protection.

[0002] The present invention relates to an endothermic module and a passive fire protection device comprising such a module. Such a protection device makes it possible to protect an element to be protected against fire.

[0003] By "passive fire protection", we mean that this device plays a preventive role in protecting said element to be protected, by enabling it to resist a fire, for a given duration, generally set by the regulations of the place where this element to be protected is located.

[0004] By "element to be protected", we mainly mean a cable tray, but also for example an air duct or a pipe.

[0005] A "cable tray" is a support device, which allows one or more cables to be received, for example electrical cables or computer or multimedia networks. Such a cable tray is generally attached to the walls (walls, floors, ceilings) of a room. It can be used for example in the construction, industry and nuclear power plants.

[0006] Preferably, the cable tray has the shape of a longitudinal gutter, preferably topped with a cover, this gutter receiving the cables.

[0007] The cables which are arranged in these cable trays must be passively protected against fire. STATE OF THE ART

[0008] Document WO 2021 / 023946 already discloses a method for fire protection of a cable tray, which consists of assembling around said tray, several square or rectangular cushions, provided internally with an internal thermal insulating lining. Each cushion is equipped on its edges with self-gripping strips and the different rigid or semi-rigid cushions are assembled to each other using its self-gripping strips.

[0009] However, these cushions have reduced flexibility and such an assembly method has the disadvantage of requiring handling and assembly of the cushions one by one, which is time-consuming. In addition, the result obtained is not satisfactory because there are many empty spaces between the cushions and flames can slip inside, as seen in the figures of this document. Finally, such a protection method is not suitable for the protection of cable trays having many bends or complex shaped paths because the cushions do not have the capacity to fit these complex shapes well.

[0010] Also known in the state of the art is a passive protection system, of the taping type, which consists of taping, that is to say surrounding, the entire length of a cable tray and the cables located therein, using a protection system made of fire-resistant material.

[0011] Some of these protection systems use a powdered endothermic product mixed with glue, then this mixture is applied in layers on a thermal insulator of the mineral wool type, for example with a roller, brush or spatula, then this thermal insulator is wrapped around the cable tray.

[0012] However, this method has many drawbacks mentioned below.

[0013] First of all, there are implementation constraints.

[0014] Indeed, the glue / endothermic powder mixture must be made on site, its homogeneity is not necessarily guaranteed and reproducible, and its manufacture is time-consuming. The mixture is applied on site, which requires protecting the surrounding installations and the operator who intervenes. This mixture must be applied in the form of a layer of a certain thickness to comply with the recommendations in terms of fire protection, but a manual technique is difficult to reproduce. In addition, the glue adds weight to the whole. Finally, the mixture has a limited lifespan, due to the drying of the glue or its decantation and must be used quickly.

[0015] There are also constraints on interaction with the environment.

[0016] Indeed, the glue used in the mixture is not neutral in the face of fire and can reduce or degrade the performance of the endothermic product. In addition, the glues used in this endothermic glue / powder mixture contain aluminum and / or alumina. For the protection of an element (cable tray or others) located in a building housing a nuclear reactor, this is unthinkable.

[0017] Finally, there are constraints linked to the dismantling and recycling of this wrapping, as well as the generation of waste, for example when adding a new cable to an existing cable tray.

[0018] The glue in the endothermic glue / powder mixture dries and becomes rigid, which does not allow its removal without destruction. In addition, this removal of the wrapping is long, complicated and tedious, with a risk of damage to the anti-corrosion protection of the cable trays or the cables themselves which remain under electrical voltage.

[0019] Since the mixture is applied to a fibrous thermal insulator, the endothermic product can no longer be separated from this insulator, to be reused or recycled. Finally, when applying the mixture, it is necessary to protect other nearby materials and the operator, as explained above and the plastic sheeting, goggles, gloves used for this application must be treated as radiological waste, if this wrapping is done in a nuclear zone. Statement of the invention

[0020] The invention therefore aims to propose an endothermic module which makes it possible to position an endothermic product around the element to be protected, guaranteeing a homogeneous and regular distribution of this product and guaranteeing the maintenance of this homogeneous distribution over time.

[0021] Another aim of the invention is to propose an endothermic module sufficiently flexible to adapt and fit the contours of the elements to be protected, including for example tortuous cable paths.

[0022] Another aim of the invention is to propose an endothermic module which can be prefabricated and handled simply, without generating dirt for the operator or the environment of use.

[0023] Yet another aim of the invention is to provide an endothermic module whose endothermic product is not mixed with glue for example, so that its performance is not degraded and this module can be recycled and reused easily.

[0024] Finally, an aim of the invention is to be able to integrate this endothermic module into a passive fire protection device, which can, if necessary, be easily dismantled after its installation around an element to be protected, and which can then be easily put back in place, all without deterioration.

[0025] To this end, the invention relates to an endothermic module for a device for wrapping and providing passive fire protection for an element to be protected.

[0026] According to the invention, this module extends along a longitudinal axis, it comprises two rectangular strips of a fire-resistant blocked mesh fabric, the two strips of fabric are assembled so that their respective long sides are parallel to the longitudinal axis of the module and are sewn together to form a plurality of closed storage pockets, of oblong shape and longitudinal axis, these storage pockets being parallel to each other along their longitudinal sides, and the longitudinal axes of these storage pockets being perpendicular to the longitudinal axis of the endothermic module and at least one of these storage pockets is filled with an endothermic material in powder form.

[0027] Thanks to these characteristics of the invention, the endothermic product is well distributed in the storage pockets, which guarantees a good proportion of product per square meter. In addition, the endothermic product is enclosed and protected in the pockets of the module and the module can be handled without special protections.

[0028] Finally, the module is flexible along the seams of the pockets, which makes it easier to en- rolling around the element to be protected.

[0029] According to other advantageous and non-limiting characteristics of the invention, taken alone or in combination:

[0030] - at least one of the oblong storage pockets is subdivided into several sub- storage pockets by separating seams, which are perpendicular to the longitudinal axis of this oblong storage pocket;

[0031] - the fire-resistant blocked mesh fabric is chosen from a fabric having a fire classification Ml or MO and allowing only the water vapor released by the endothermic material to pass through when the endothermic module is subjected to a temperature greater than or equal to 100°C;

[0032] - the endothermic material in powder form is chosen from metasilicate sodium and calcium metasilicate.

[0033] The invention also relates to a device for wrapping and providing passive fire protection for an element to be protected, in particular a cable tray, an air duct or a pipe.

[0034] According to the invention, this device comprises a flexible mattress, which comprises at least one endothermic module as mentioned above and at least one layer of a thermal insulating material, this mattress is surrounded by a fire-resistant blocked mesh fabric envelope, this mattress has a longitudinal axis Xl-X' 1, an inner longitudinal end and an opposite outer longitudinal end, the longitudinal axis Xl-X' 1 of the mattress being perpendicular to the longitudinal axis Y-Y' of the storage pockets of the endothermic module, the mattress comprises at its inner longitudinal end, a removable attachment device configured to allow the mattress to be attached to the element to be protected, and the mattress also comprises a removable fixing device, configured to allow the mattress to be held in a so-called "taped" position, in which said mattress is wound around said element to be protected and is wound on itself.

[0035] According to other advantageous and non-limiting characteristics of the invention, taken alone or in combination:

[0036] - the thermal insulating material is mineral wool or silicone foam;

[0037] - the removable attachment device comprises a strap having a first end and a second end, in that said second end of the strap is provided with a first hooking member, in that said first end of the strap is fixed to the inner longitudinal end of the mattress and is provided with a second hooking member and in that the first hooking member and the second hooking member are complementary hooking members, such as a piece of fabric carrying hooks and a piece of fabric carrying loops or two pieces of repositionable adhesives or a hook and a ring;

[0038] - the mattress comprises at its outer longitudinal end, a strip of fabric silicone-coated, airtight and decontaminable;

[0039] - the removable fixing device is fixed to the outer longitudinal end of the mattress or on the silicone fabric strip, airtight and decontaminable;

[0040] - the removable fixing device comprises a first removable fixing member and a second removable fastener which are complementary fasteners to each other, such as a piece of fabric carrying hooks and a piece of fabric carrying loops or two pieces of repositionable adhesives or a hook and a ring. DESCRIPTION OF FIGURES

[0041] Other characteristics, aims and advantages of the invention will emerge from the following description, which is purely illustrative and non-limiting, and which must be read in conjunction with the appended drawings in which:

[0042] [Fig.l] is a diagram representing a manufacturing step of the endothermic module according to the invention.

[0043] [Fig.2] is a diagram representing a first embodiment of the endothermal module according to the invention, on which a part of this module has been truncated.

[0044] [Fig. 3] is a diagram representing a second embodiment of the endothermic module according to the invention.

[0045] [Fig.4] is a perspective view of a wrapping and passive fire protection device according to the invention and integrating the endothermic module.

[0046] [Fig.5] is a cross-sectional view of the taping and passive fire protection device of [Fig.4], taken along the section plane passing through line VV in [Fig.4].

[0047] [Fig.6] is a diagram showing in perspective and in partial section the wrapping and passive fire protection device, wrapped around an element to be protected.

[0048] [Fig.7] is a diagram showing a particular application of the wrapping and protection device according to the invention, in order to produce fire prevention screens on a cable tray.

[0049] [Fig.8] is a diagram showing a particular application of the wrapping and protection device according to the invention, making it possible to produce a thermal sleeve on a sealed crossing. DETAILED DESCRIPTION OF THE INVENTION

[0050] The endothermic module 1 will now be described in more detail in connection with figures 1 to 3. This module is intended to be used in a device 2 for wrapping and providing passive fire protection for an element to be protected A.

[0051] This element to be protected A is preferably a cable tray, as shown in Figures 4 and 6 and 7, but can also be, for example, a pipe, as shown in [Fig.8] or even an air duct or any other elongated element.

[0052] The endothermic module 1 comprises two strips 11 and 12 of fire-resistant, blocked mesh fabric, which are superimposed and sewn together, to form a plurality of closed, oblong-shaped storage pockets 13.

[0053] The two strips 11 and 12 of fabric may be made up of two different sheets of fabric or be formed from a single sheet folded in two.

[0054] By "blocked mesh fabric" (or "blocked mesh" fabric) is meant a fabric whose warp threads and weft threads are glued at their intersection (at their crossing point). Such a fabric has the advantage of not fraying in the event of tearing due to the blocking of the stitches, which limits degradation and does not impact other neighboring pockets.

[0055] Preferably, this fire-resistant blocked mesh fabric is chosen from fabrics having a fire classification of M1 or MO. According to the classification of the flammability of materials, M1 denotes a fabric which is combustible but non-flammable and does not release smoke in the event of a fire. MO denotes a fabric which is incombustible and non-flammable. The fabric is for example a mesh tulle comprising 100% cotton, i.e. cotton and up to 5% polyester. The endothermic module 1 has a longitudinal axis X-X'. Preferably, the two strips 11 and 12 of fabric are rectangular in shape and this longitudinal axis X-X' extends in the longitudinal direction of these rectangles (in other words the respective long sides 110, 120 of the rectangular strips 11, 12 are parallel to the axis X-X').

[0056] Each storage pocket 13 being oblong in shape, it has a central longitudinal axis Y-Y'. As can be seen in the figures, the different storage pockets 13 are parallel to each other along their respective longitudinal sides. In other words, the central longitudinal axes Y-Y' of each oblong pocket 13 are parallel to each other. Furthermore, preferably, the central longitudinal axes Y-Y' of each pocket 13 are perpendicular to the longitudinal axis X-X'.

[0057] Each storage pocket 13 is thus delimited by two parallel seams 14, called “transverse” because they extend across the width of the strips 11 and 12 and by two end seams 15. The seams 14 are perpendicular to the longitudinal axis X-X' and the seams 15 are parallel to it.

[0058] At least one of the storage pockets 13 of the endothermic module 1, and preferably all of the storage pockets 13, are filled with an endothermic material 100, (see [Fig.2] where one of the pockets 13 has been shown truncated).

[0059] During manufacture, the pockets 13 are sewn on three sides, the endothermic material 100 is inserted therein, and then the final seam is made.

[0060] The endothermic material 100 is inserted into the pockets 13, in powder form, that is to say that it is free of a binder such as for example glue. There are thus no negative interactions on the fire protection effect. This endothermic material does not comprise alumina, which allows use in a building containing a nuclear reactor. Preferably, in the pockets 13, there is exclusively endothermic material 100.

[0061] By "endothermic material" is meant a material having the property of absorbing heat in the event of fire and of emitting water vapor, when subjected to a temperature greater than or equal to 100°C.

[0062] Furthermore, the fact that the pockets 13 are made of blocked mesh fabric has the advantage that this fabric can allow the water vapor thus produced to pass through.

[0063] This water vapor can then be retained by a thermal insulating material, placed nearby, as will be described later in the wrapping and passive fire protection device 2 according to the invention.

[0064] This phenomenon of water vapor production makes it possible to delay the progression of the heat of a fire, from the outside to the inside of the wrapping and therefore towards the element to be protected A.

[0065] Preferably, the endothermic material 100 is chosen from sodium metasilicate and calcium metasilicate, preferably sodium metasilicate tri or penta hydrate.

[0066] The dimensions of the storage pocket 13 are a function of the distance DI between the two transverse seams 14 which delimit the pocket 13 on either side, and of the width 1 of the endothermic module 1 which corresponds substantially to the length of the oblong pocket 13.

[0067] These dimensions of the storage pockets 13 are calculated so that, once completely filled, the quantity of endothermic product 100 per square meter corresponds to the expected fire resistance performance. This quantity of endothermic product 100 also has an impact on the weight of the module 1 and, less significantly, on the thickness E of the module 1.

[0068] As a purely illustrative example, this quantity of product is for example between 2 kg and 8 kg per m2, preferably equal to 4 kg / m2.

[0069] Preferably, the width 1 of the endothermic module 1 is between 300 mm and 600 mm.

[0070] Preferably, the distance DI between the two transverse seams 14 which delimit the pocket 13 is between 10 mm and 50 mm.

[0071] Preferably, the thickness E of the endothermic module 1 is between 6 mm and 20 mm.

[0072] According to an alternative embodiment shown in [Fig.3], it is possible to subdivide one or more of the oblong storage pockets 13 into several storage sub-pockets 130 by making separation seams 16. Preferably, these separation seams 16 are parallel to the seams 15 and to the longitudinal axis X-X'.

[0073] Such separation seams 16 make it possible to ensure that the endothermic product remains in place over time, particularly when the element to be protected A is vertical. Indeed, in this case, and as will be described in more detail later, the oblong storage pockets 13 of the module 1, inserted into the wrapping device 2, are arranged so that their respective longitudinal axes Y-Y' are vertical. The separation seams 16 then maintain the homogeneity of the product 100 while preventing all of the endothermic product from settling at the bottom of the pocket 13 arranged vertically.

[0074] The device 2 for wrapping and providing passive fire protection for an element to be protected will now be described in more detail in connection with FIGS. 4 to 6.

[0075] This device 2 has a longitudinal axis Xl-X' 1. It comprises a flexible mattress 3 also with a longitudinal axis Xl-X' 1.

[0076] In the cross-sectional view of [Fig.5], it can be seen that this flexible mattress 3 comprises at least one endothermic module 1 and at least one layer of a thermal insulating material 30. As a purely illustrative example, it can be seen in this figure that the mattress 3 here comprises two endothermic modules 1, each of them being inserted between two layers 30, so that the mattress 3 comprises three layers 30.

[0077] The thermal insulating material constituting the layer 30 is chosen from insulators of the fibrous type, for example mineral wool, or of the non-fibrous type, for example silicone foam.

[0078] The thickness of each of the modules 1 and of each of the layers 30 of thermal insulating material, as well as the number of these modules and of these layers are adapted according to the fire resistance performance required for the mattress 3.

[0079] The flexible mattress 3 is surrounded by an envelope 31, made of fire-resistant blocked mesh fabric, preferably chosen from fabrics having a fire classification of M1 or MO. This fabric is for example a mesh tulle comprising 100% cotton, i.e. cotton and up to 5% polyester.

[0080] The length L1 of the mattress 3 is identical to the length L of each endothermic module 1, or almost identical (except for the thickness of the envelope 31).

[0081] The length L1 of the mattress 3 is adapted to the dimensions of the perimeter of the element to be protected A, since the taping and passive fire protection device 2 is intended to be wound (taped) around this element to be protected. Preferably, this length L1 is equal to the perimeter of the element to be protected, plus an excess length of overlap, which overlaps the first turn of mattress, already wound around the element to be protected A.

[0082] Inside the mattress 3, the endothermic module(s) 1 is (are) arranged so that the longitudinal axes Y-Y' of the storage pockets 13 are perpendicular to the longitudinal axis Xl-X'l of the flexible mattress 3. This particular arrangement facilitates the wrapping of the mattress 3 around the element to be protected.

[0083] Indeed, as can be seen in [Fig.6], the element to be protected A has a longitudinal axis Y1-Y' 1. By wrapping the mattress 3 around the element to be protected A, so that its longitudinal axis Xl-X' 1 is perpendicular to the longitudinal axis Y 1-Y' 1, the oblong pockets 13 with longitudinal axes Y-Y' are parallel to the longitudinal axis Y 1-Y' 1 of the element to be protected A. As a result, the transverse seams 14, which constitute less thick zones of the endothermic module 1 and therefore foldable (deformable) are also parallel to the longitudinal axis Y 1-Y' 1 of the element to be protected A. The mattress 3, wrapped around the element to be protected A, thus better fits the contour of this element.

[0084] Preferably also the length L1 of the mattress 3, measured along the longitudinal axis Xl-X' 1 is greater than the width 11 thereof.

[0085] Furthermore, it is also possible to provide at one of the ends 32 of the mattress 3, called the “inner longitudinal end”, a removable attachment device 4 on the element to be protected A. Such a device 4 makes it possible to keep the inner longitudinal end 32 of the mattress immobile against the element to be protected, before starting to wind the mattress 3 around this element to be protected A. By “removable attachment”, it is meant that this device can be attached to the element to be protected or detached from it.

[0086] A possible embodiment of this attachment device 4 will now be described. This device 4 comprises a strap 40, having two opposite ends, namely a first end 41 and a second end 42. The strap 40 is fixed by its first end 41, to the internal longitudinal end 32 of the mattress.

[0087] Furthermore, this strap is provided at its second end 42 with a first attachment member 43 and at its first end 41 with a second attachment member 44. The attachment members 43 and 44 are configured to cooperate with each other. Preferably, the first attachment member 43 is arranged on one of the two faces of the strap 40, while the second attachment member 44 is arranged on the other of its two faces.

[0088] The attachment members 43 and 44 are for example:

[0089] - a piece of fabric bearing hooks and a piece of fabric bearing loops, known for example under the brand name Velcro,

[0090] -two pieces of repositionable adhesive material, or

[0091] -a hook and a ring.

[0092] Advantageously, and as shown in [Fig.4], the mattress 3 may have at its outer longitudinal end 33 (opposite its end 32), a strip of fabric 5, formed for example from a silicone fabric, airtight and decontaminable.

[0093] When the mattress 3 is wrapped around the element to be protected A, this strip of fabric 5 is at the end of the winding and therefore outside of it and protects the whole of it, (see the arrow F in [Fig.4], which symbolizes the orientation of this winding).

[0094] Also preferably, the mattress 3 or the strip of fabric 5 if present, is provided with a removable fixing device 6. This device 6 allows the mattress 3 to be held in a so-called “taped” position, that is to say a position in which the mattress 3 is wound around the element to be protected A and is wound on itself.

[0095] By “removable attachment” is meant that this device can be attached to hold the mattress 3 (and the strip of fabric 5 if it is present) in the taped position or be undone, to unroll the mattress 3 and the strip of fabric 5 if it is present.

[0096] The removable fixing device 6 comprises a first removable fixing member 61 and a second removable fixing member 62 which are fixing members complementary to each other.

[0097] Preferably, the first removable fixing member 61 is fixed on one of the two faces of the fabric strip 5, while the second removable fixing member 62 is fixed on the other of the two faces of the fabric strip. The arrangement can be transverse as shown in [Fig.4] or longitudinal.

[0098] The fixing members 61 and 62 are for example:

[0099] - a piece of fabric bearing hooks and a piece of fabric bearing loops, known for example under the brand name Velcro,

[0100] -two pieces of repositionable adhesive material, or

[0101] -a hook and a ring.

[0102] Although not shown in the figures, the removable fastening device 6 may also comprise a strap similar to the strap 4, on which the first removable fastening member 61 and the second removable fastening member 62 are fixed, this strap being fixed to the free end of the fabric 5.

[0103] Finally, although this is not shown in the figures either, in the absence of the strip of fabric 5, the first removable fixing member 61 and the second removable fixing member 62 and possibly this strap can be fixed directly to the mattress 3.

[0104] Whatever the embodiment chosen, the first removable fixing member 61 and the second removable fixing member 62 are positioned relative to each other so as to be able to cooperate with each other, when the mattress 3 is wound around said element to be protected A and is wound on itself and possibly when the strip of fabric 5, if present, is wrapped around said mattress 3.

[0105] In addition to the use of the wrapping device 2 for the protection of an element to be protected of the cable tray type, already described in connection with Figures 4 and 6, it is also possible to provide other uses of this device, for example use as a fire prevention screen on an element to be protected, such as a cable tray, (see [Fig.7]) or use as a thermal sleeve, (see [Fig.8]).

[0106] In [Fig.7], it can be seen that two taping devices 2 are arranged at a certain distance from each other around the element to be protected A, so as to segment it. This limits the possibility that the materials constituting the cables will serve as fuel for the fire. In other words, the zone Z between two consecutive taping devices 2 is sacrificed in the event of a fire starting in this zone, but the fire does not spread beyond it.

[0107] In [Fig.8], it can be seen that the element to be protected A, here a tube, passes through a wall B, which has been plugged in part C (caulking). At the point where it passes through wall B, the wrapping device 2 is wound around the tube and thus helps to prevent the transmission of a fire from one side of wall B to the other.

[0108] The device 2 has many advantages. It is flexible, as previously explained, which facilitates its implementation rolled up. It can be stored ready for use. There is no need to protect the operator handling it, nor the environment in which it is installed.

Claims

Claims

1. Endothermic module (1) for a device for wrapping and passive fire protection of an element to be protected, characterized in that it extends along a longitudinal axis (X-X'), in that it comprises two rectangular strips (11, 12) of a fire-resistant blocked mesh fabric, in that the two strips (11, 12) of fabric are assembled so that their respective long sides (110, 120) are parallel to the longitudinal axis (X-X') of the module (1) and are sewn together to form a plurality of closed storage pockets (13), of oblong shape and longitudinal axis (Y-Y'), these storage pockets (13) being parallel to each other along their longitudinal sides, and the longitudinal axes (Y-Y') of these storage pockets (13) being perpendicular to the longitudinal axis (X-X') of the endothermic module (1), and in that at least one of these storage pockets (13) is filled with an endothermic material (100) in powder form.

2. Endothermic module (1) according to claim 1, characterized in that at least one of the oblong storage pockets (13) is subdivided into several storage sub-pockets (130) by separating seams (16), which are perpendicular to the longitudinal axis (Y-Y') of this oblong storage pocket (13).

3. Endothermic module (1) according to claim 1 or 2, characterized in that the fire-resistant blocked mesh fabric is chosen from a fabric having a fire classification M1 or MO and allowing only the water vapor released by the endothermic material (100) to pass through when the endothermic module (1) is subjected to a temperature greater than or equal to 100°C.

4. Endothermic module (1) according to any one of the preceding claims, characterized in that the endothermic material (100) in powder form is chosen from sodium metasilicate and calcium metasilicate.

5. Device for wrapping and passive fire protection (2) of an element to be protected (A), in particular a cable tray, an air duct or a pipe, characterized in that it comprises a flexible mattress (3), which comprises at least one endothermic module (1) according to any one of claims 1 to 4, and at least one layer of a thermal insulating material (30), -in that this mattress (3) is surrounded by an envelope (31) made of fire-resistant blocked mesh fabric, -in that this mattress (3) has a longitudinal axis (Xl-X' 1), an inner longitudinal end (32) and an opposite outer longitudinal end (33), the longitudinal axis (Xl-X'l) of the mattress (3) being perpendicular to the longitudinal axis (Y-Y') of the storage pockets (13) of the endothermic module (1), -in that the mattress (3) comprises at its inner longitudinal end (32), a removable attachment device (4) configured to allow the mattress to be attached to the element to be protected (A), -and in that the mattress (3) also comprises a removable fixing device (6), configured to allow the mattress (3) to be held in a so-called "taped" position, in which said mattress (3) is wrapped around said element to be protected (A) and is wound on itself.

6. A wrapping device according to claim 5, characterized in that the thermal insulating material (30) is mineral wool or silicone foam.

7. A wrapping device according to claim 5 or 6, characterized in that the removable hooking device (4) comprises a strap (40) having a first end (41) and a second end (42), in that said second end (42) of the strap is provided with a first hooking member (43), in that said first end (41) of the strap is fixed to the inner longitudinal end (32) of the mattress (3) and is provided with a second hooking member (44) and in that the first hooking member (43) and the second hooking member (44) are complementary hooking members, such as a piece of fabric carrying hooks and a piece of fabric carrying loops or two pieces of repositionable adhesives or a hook and a ring.

8. Wrapping device according to any one of the preceding claims, characterized in that the mattress (3) comprises at its outer longitudinal end (33), a strip of silicone-coated, airtight and decontaminable fabric (5).

9. Wrapping device according to any one of the preceding claims, characterized in that the removable fixing device (6) is fixed to the outer longitudinal end (33) of the mattress (3) or to the strip of silicone-coated, airtight and decontaminable fabric (5).

10. A wrapping device according to any one of the preceding claims, characterized in that the removable fastening device (6) comprises a first removable fastening member (61) and a second removable fastening member (62) which are complementary fastening members to each other, such as a piece of fabric carrying hooks and a piece of fabric carrying loops or two pieces of repositionable adhesives or a hook and a ring.

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