Protective device and method for protecting a pressure vessel

Abstract

Protective device (104) for a pressure vessel (102) for storing a gas under pressure, comprising - a protective cover (124) for enclosing the pressure vessel (102) and - a safety sleeve (128) for enclosing the protective cover (124), wherein the safety sleeve (128) comprises a material that contracts under the influence of heat.

Description

[0001] The present invention relates to a protective device for a pressure vessel for storing a pressurized gas.

[0002] Especially for mobile applications of pressure vessels for storing pressurized gas, such as pressure vessels for storing hydrogen gas, the ratio between the mass of the storage device and the mass of the stored gas is particularly important. The goal is to provide a particularly lightweight storage device that can store a large amount of gas to be stored, so that a large amount of fuel is available for mobile applications, such as hydrogen-powered vehicles, while still keeping the mass of the vehicle, especially the mass of the storage device, as minimal as possible.

[0003] The problem here is that the reduction in the mass of the storage device is usually accompanied by less protection of the storage device against unwanted damage, so that a compromise must be found in order to be able to transport the usually highly flammable or even explosive gas or gas mixture in the storage device in large quantities on the one hand and safely on the other.

[0004] DE 10 2008 061 023 A1 discloses an inner shell for a pressure vessel, which inner shell comprises shaped, spaced recesses to support thermal expansion and contraction of the inner shell and thus counteract damage thereof.

[0005] The present invention is based on the object of providing a protective device for a pressure vessel for storing a pressurized gas, which has a low mass and can be produced cost-effectively.

[0006] This object is achieved according to the invention in that the protective device comprises a protective cover for enclosing the pressure vessel and a safety cover for enclosing the protective cover, wherein the safety cover comprises a material which contracts under the influence of heat.

[0007] Because the protective device for the pressure vessel comprises a protective cover for enclosing the pressure vessel, the pressure vessel can be stored in a protected manner according to the invention.

[0008] By enclosing the protective cover with a safety cover, it is also possible to protect the protective cover and thus provide additional protection for the pressure vessel, whereby the choice of material for the safety cover, which comprises a material that contracts under the influence of heat with a previously known shrinkage ratio, enables simple and cost-effective production of the protective device.

[0009] The protective cover is preferably designed to enable decoupling of the movement and / or size change (expansion) of the object enclosed by the protective cover from the surroundings of the protective cover, in particular such that a movement and / or size change of the object enclosed by the protective cover, in particular of the pressure vessel, does not lead, or only insignificantly leads, to a movement and / or size change of the outer surface of the protective cover. At least minor movements and / or size changes of the object enclosed by the protective cover are thus preferably not transmitted to the safety cover surrounding the protective cover.

[0010] It may be advantageous if the protective shell is designed in one piece, so that any expansion of the pressure vessel when it is loaded with pressurised gas can be evenly absorbed by the protective shell and thus the safety shell is not subjected to uneven local stress, if at all.

[0011] It may be advantageous if the protective cover comprises or is made of an elastic material. This allows for particularly simple decoupling of the movement and / or expansion of the object enclosed by the protective cover from the surroundings of the protective cover.

[0012] In one embodiment of the invention, the protective cover comprises a foam material or is formed from a foam material. This allows for a particularly lightweight and cost-effective design of the protective cover.

[0013] It may be advantageous if the foam material is selected so that it is temperature-resistant to at least approximately 100°C, in order to withstand a temperature increase, for example, during rapid filling of the pressure vessel, without damage. It is particularly advantageous if the foam material is selected so that it is temperature-resistant to at least approximately 150°C, so that during the manufacture of the protective device, the assembly of the safety cover onto the protective cover, which takes place under the influence of heat, can be carried out quickly at a high temperature.

[0014] As a foam material, for example, Armaflex® or a high-temperature foam such as melamine can be chosen from the technical areas of a combined heat and power plant or from the heating and hot water storage area.

[0015] In one embodiment of the invention, the protective cover can be or is secured to the pressure vessel in a form-fitting manner. This allows for a particularly stable design of the protective device and thus reliable protection of the pressure vessel.

[0016] The safety cover is preferably made of a robust material, in particular a material resistant to chemically aggressive gases, for example polyolefin, PVDF, PTFE or Viton.

[0017] Furthermore, it can be provided that the safety cover is formed from a hard and / or impact-resistant material, at least in the assembled state of the protective device.

[0018] It may be advantageous if the safety cover comprises a plastic material, particularly a cross-linked plastic material. This allows for particularly cost-effective production of the safety cover using a material that contracts under the influence of heat.

[0019] In particular, it can be provided that the safety sleeve is designed, at least in sections, preferably entirely, as a shrink tube. Shrink tubes are known, for example, for the electrical insulation of electrical connections.

[0020] The material of a shrink tube is in particular a thermoplastic, which is cross-linked in the extruder after production so that the molecular chains are connected to each other.

[0021] Advantageously, the material of a heat-shrink tubing, for example, produced by an extrusion process, can be expanded while warm and then frozen in this expanded state by cooling. Upon reheating, the heat-shrink tubing returns to its original extrusion state and contracts.

[0022] In one embodiment of the invention, at least one additional intermediate layer is arranged between the protective cover and the safety cover, which at least partially, preferably completely, surrounds the protective cover. In this way, an additional protective layer can be arranged particularly easily on the protective device to increase the safety of the pressure vessel.

[0023] In one embodiment of the invention, it is provided that at least one intermediate layer comprises fibers, for example GRP fibers, CFRP fibers, aramid threads and / or metal threads.

[0024] It may be advantageous if the at least one intermediate layer comprises a woven material, in particular a material woven from fibers, for example, GRP fibers, CFRP fibers, aramid threads, or metal threads. This provides effective additional protection for the pressure accumulator to be protected by the protective device.

[0025] The at least one intermediate layer is preferably applied essentially loosely to the protective sleeve and is only secured to the protective sleeve when the safety sleeve is secured. This can be achieved by a clamping effect of the safety sleeve during shrinkage and / or by an adhesive coating on the safety sleeve.

[0026] It may be advantageous if the protective device comprises a transport and storage device for transporting and / or storing the protective device together with the pressure vessel arranged therein. The transport and storage device preferably comprises at least two releasably connectable receiving elements for receiving the protective device and the pressure vessel arranged therein. The transport and storage device can, in particular, enable easy handling and / or stacking of several pressure accumulators, each equipped with a protective device.

[0027] The at least two receiving elements can preferably be connected to one another by means of at least one tongue and groove connection. In this way, unwanted rotation of the receiving elements, which are preferably at least approximately rotationally symmetrical about an axis, relative to one another can be effectively prevented.

[0028] A particularly cost-effective design of the receiving elements is possible, especially if the at least two receiving elements are identical to each other. This allows the transport and storage device to be manufactured particularly simply and cost-effectively.

[0029] It may be advantageous if at least one of the receiving elements provides at least one recess for the passage of at least one connection device of the pressure vessel. In this way, gas can be supplied to or removed from the pressure vessel even when the transport and storage device is installed.

[0030] The transport and storage device advantageously has at least one projection which, when the protective device is mounted, extends further away from the pressure vessel in a direction than a connection device of the pressure vessel extends in this direction. In this way, damage to a connection device of the pressure vessel can be avoided, particularly in the event of improper handling of the protective device and the pressure vessel arranged therein.

[0031] The projection is preferably annular so that a protective ring is formed around the connecting device.

[0032] A particularly stable connection between the receiving elements is possible, especially when using retaining straps, such as elastic, tensionable, crimpable, and / or high-strength retaining straps. Retaining straps used for pallet strapping, in particular, enable a particularly stable connection between the two receiving elements.

[0033] Advantageously, the receiving elements, in their connected state, enclose a cavity whose dimensions correspond at least approximately to those which a combination of a pressure vessel, a protective cover and a safety cover has in the assembled state, so that the combination can be received in the receiving elements essentially without play.

[0034] The protective device according to the invention is particularly suitable for use in a storage device for storing a pressurized gas, comprising at least one pressure vessel and at least one protective device according to the invention.

[0035] The storage device according to the invention preferably has the features and / or advantages described above in connection with the protective device according to the invention.

[0036] In particular, it can be provided that the at least one pressure vessel is a mobile pressure vessel, for example, a pressure vessel for hydrogen (a hydrogen gas cylinder). Such a pressure vessel is particularly suitable for use in hydrogen-powered vehicles, for example, automobiles.

[0037] Other land vehicles, watercraft, aircraft and spacecraft can also be considered as vehicles.

[0038] The present invention is based on the further object of providing a method for protecting a pressure vessel which is simple to carry out and cost-effective and enables reliable protection of the pressure vessel.

[0039] This object is achieved according to the invention in that a protective cover is arranged on the pressure vessel and in that a safety cover is arranged on the protective cover, wherein the safety cover comprises a material which contracts under the influence of heat.

[0040] The method according to the invention preferably has the features and / or advantages described above in connection with the protective device according to the invention and / or the storage device according to the invention.

[0041] In one embodiment of the invention, the safety sleeve is heated to secure it to the protective cover. This allows, in particular, a stable, form-fitting arrangement of the safety sleeve to the protective cover.

[0042] The material of the containment shell is preferably selected such that, after the heating process has been carried out, the containment shell is essentially expansion-invariant, so that the expansion of the containment shell does not change even if the dimensions of the pressure vessel change due to loading of the pressure vessel with pressurised gas or discharging of the pressure vessel.

[0043] It may be advantageous if, prior to arranging the protective cover on the pressure vessel, at least one connection device of the pressure vessel, by means of which gas can be supplied to the pressure vessel and / or by means of which gas can be removed from the pressure vessel, is provided with a temporary cover that prevents the at least one connection device from becoming contaminated when the protective cover is arranged on the pressure vessel. In this way, it is possible, in particular, to arrange the protective device according to the invention on an already fully assembled pressure vessel with connection devices arranged thereon.

[0044] A particularly simple design for the protective cover is possible if the pressure vessel is covered with foam to create the protective cover. This makes it particularly easy to produce a one-piece protective cover.

[0045] In one embodiment of the invention, at least one intermediate layer is inserted between the protective sleeve and the safety sleeve before heating the safety sleeve to secure it to the protective sleeve. This provides additional protection for the pressure vessel.

[0046] The intermediate layer can be firmly bonded to the protective cover before the safety cover is applied and heated. Alternatively, the intermediate layer can simply be placed between the protective cover and the safety cover. Only when the safety cover is heated is the intermediate layer then secured to the protective cover, together with the safety cover.

[0047] Furthermore, the protective device according to the invention, the storage device according to the invention and / or the method according to the invention for protecting a pressure vessel can have the features and / or advantages described below: A pressure accumulator can, for example, be a so-called Type 3 compressed gas storage device, which has a hydrogen-tight metal inner container and an outer fiberglass wrapping embedded in epoxy resin. Such a pressure vessel can be designed particularly light.

[0048] Preferably, the pressure vessel can store gas at a pressure of at least approximately 350 bar, in particular at least approximately 500 bar.

[0049] It is advantageous if at least one kilogram of hydrogen can be stored in the pressure vessel.

[0050] The storage device according to the invention can preferably be designed as a removable storage device or as a component of a permanently installed system.

[0051] The storage device according to the invention preferably enables a storage content of at least approximately 4 percent by weight, which means that with a total mass of the storage device of, for example, 25 kg, at least 1 kg of hydrogen can be stored in the storage device.

[0052] By constructing the protective device according to the invention and / or the storage device according to the invention and by carrying out the method according to the invention, the risk of gas accumulation is effectively prevented, since the storage device according to the invention and the protective device according to the invention preferably do not have any closed spaces in which gas could accumulate.

[0053] It may be advantageous if the protective cover is made of a material with graded hardness, i.e. starting from an inner side of the protective cover, with which the protective cover rests against the pressure vessel in the assembled state, the porosity, the hardness and / or the elasticity of the material changes, for example increases, towards the outside.

[0054] It can be advantageous to use a closed-cell foam material as the material for the protective cover.

[0055] Preferably, the thickness of the protective cover is at least approximately 2 cm, in particular at least approximately 3 cm. Furthermore, the thickness of the protective cover can be at most approximately 5 cm.

[0056] Preferably, the elasticity of the protective cover is selected so that a change in the volume of the pressure vessel when loaded with pressurised gas and when the gas is removed from the pressure vessel is compensated, so that the protective cover always fits tightly against the pressure vessel and the external dimensions of the protective cover do not change.

[0057] An intermediate layer, designed, for example, as a woven cover, serves in particular to protect the pressure vessel from external damage, such as damage in the form of cuts or damage caused by the penetration of objects. Furthermore, such an intermediate layer can preferably prevent large parts of the protective cover from being stripped off the pressure vessel.

[0058] Preferably, all components of the protective device, including the transport and storage device, are made of pure materials (plastics / metal alloys) so that simple and environmentally friendly disassembly and recycling are possible.

[0059] Further features and / or advantages of the protective device according to the invention, the storage device according to the invention and / or the method according to the invention are the subject of the following description and the graphic representation of an embodiment.

[0060] The drawings show: Fig. 1 shows a schematic longitudinal section through a storage device for storing a pressurized gas; Fig. 2 a schematic longitudinal section through a pressure vessel of the storage device from Fig. 1; Fig. 3 a schematic longitudinal section through the pressure vessel of the storage device from Fig. 1, with a protective cover of a protective device of the storage device and temporary covers on connection devices of the pressure vessel; Fig. 4 a schematic longitudinal section through the pressure vessel of the storage device from Fig. 1, with protective cover attached thereto, temporary covers for the connection devices of the pressure vessel and an additional intermediate layer; Fig. 5 a schematic side view of a storage device with a transport and storage device in the assembled state; Fig. 6 a schematic vertical section through a receiving element of the transport and storage device from Fig. 5; Fig. 7 a schematic representation of a plan view of the receiving element from Fig. 6 looking in the direction of arrow 7 in Fig. 6; and Fig. 8 a schematic representation of a plan view of the receiving element from Fig. 6 looking in the direction of arrow 8 in Fig. 6.

[0061] Identical or functionally equivalent elements are provided with the same reference numerals in all figures.

[0062] One in the Fig. The storage device shown in Figures 1 to 8 and designated as a whole by 100 comprises a pressure vessel 102 for storing pressurized gas, for example hydrogen, a protective device 104 for protecting the pressure vessel 102 and a transport and storage device 106 for transporting and storing the combination of pressure vessel 102 and protective device 104 of the storage device 100.

[0063] The pressure vessel 102 is designed, for example, as a Type 3 pressure vessel and as such comprises a hydrogen-tight metal inner vessel which is surrounded by an outer glass fiber wrapping embedded in epoxy resin.

[0064] The pressure vessel 102 has a central cylindrical section 108, which is delimited by two dome-shaped end sections 110 arranged at the opposite ends of the cylindrical section 108.

[0065] The cylindrical section 108 and the dome-shaped end sections 110 define an interior space 112 of the pressure vessel 102 in which the gas to be stored can be accommodated.

[0066] Each of the dome-shaped end sections 110 of the pressure vessel 102 is provided with a connection device 114, wherein a Fig. 1 to 4, the connection device 114 of the pressure vessel 102 shown on the left side comprises a loading device 116 for loading the pressure vessel 102 with gas and a quick coupling 118 for connecting a line for the gas to be supplied to the pressure vessel 102.

[0067] The one on the in the Fig. 1 to 4, the connection device 114 arranged on the right side of the pressure vessel 102 comprises a withdrawal device 120 for withdrawing gas from the pressure vessel 102 and a quick coupling 122 for connecting a withdrawal line (not shown) for the gas to be withdrawn from the pressure vessel 102.

[0068] The removal device 120 and the loading device 116 can also be functionally combined in a common connection device 114 with a quick coupling 118, so that only one dome-shaped end section 110 of the pressure vessel 102 is equipped with a connection device 114.

[0069] The pressure vessel 102 is surrounded by the protective device 104 to protect it.

[0070] The protective device 104 comprises a protective cover 124, which is substantially cylindrical in shape and comprises, for example, an elastic foam material.

[0071] The protective cover 124 lies tightly against the pressure vessel 102, so that the pressure vessel 102 is held without play in the protective cover 124 of the protective device 104.

[0072] The protective sheath 124 surrounds the pressure vessel 102 not only in the region of the cylindrical section 108, but also in the regions of the dome-shaped end sections 110, so that the pressure vessel 102 is held in a form-fitting manner in the protective sheath 124.

[0073] The protective cover 124 is designed, in particular due to the choice of material, such that a change in volume of the pressure vessel 102 occurring during loading and unloading of the pressure vessel 102 is absorbed by the protective cover 124, so that the outer dimensions of the protective cover 124 always remain at least approximately constant.

[0074] For additional protection of the pressure vessel 102 by means of the protective device 104, the protective device 104 comprises an intermediate layer 126, which is formed, for example, as a woven cover made of GRP fibers, CFRP fibers, aramid threads or metal threads and surrounds the protective cover 124.

[0075] Furthermore, the protective device 104 for protecting the pressure vessel 102 comprises a safety cover 128 which comprises a material that contracts under the influence of heat.

[0076] The safety sheath 128 is also substantially cylindrical and surrounds the intermediate layer 126 of the protective device 104.

[0077] Due to the choice of material for the safety sheath 128, the intermediate layer 126 can be secured to the protective sheath 124 by means of the safety sheath 128 when the safety sheath 128 is heated and thereby contracts.

[0078] As in particular Fig. 5, the storage device 100 comprises the transport and storage device 106, which is formed, for example, from plastic, in particular polypropylene (PP), and which comprises two identical receiving elements 130, for example formed as injection-molded components, for receiving the protective device 104 and the pressure vessel 102 arranged therein.

[0079] As in particular Fig. 6, each of the receiving elements 130 of the transport and storage device 106 of the storage device 100 is essentially hollow-cylindrical and comprises at one end a connecting portion 132, at which the two receiving elements 130 can be connected to one another, and at the other end a fastening region 134 with a plurality of, for example six, fastening openings 136.

[0080] The fastening openings 136 in the fastening area 134 serve to carry out a fastening device 138 of the transport and storage device 106, by means of which the receiving elements 130 can be fixed to one another.

[0081] In the fastening region 134 of the receiving element 130, a plate-shaped stop element 140 is provided, against which the protective device 104, in particular the protective cover 124, rests in the assembled state of the storage device 100 and which, in the assembled state of the storage device 100, prevents an undesired movement of the protective device 104 together with the pressure vessel 102 relative to the receiving elements 130 along a longitudinal central axis 164 of the storage device 100.

[0082] An interior space 142 of the transport and storage device 106 formed by the receiving elements 130 in the assembled state of the transport and storage device 106 has substantially the same dimensions as the protective device 104, so that the protective device 104 can be received in the interior space 142 of the transport and storage device 106 without play.

[0083] The receiving elements 130 further have recesses 144 in the stop elements 140, through which the connecting devices 114, in particular the quick couplings 118, 122 of the connecting devices 114, can extend in the assembled state of the storage device 100.

[0084] In order to avoid unintentional damage to the connecting devices 114, the fastening region 134 of the receiving elements 130 is designed as an annular projection 146, so that the connecting devices 114 projecting through the recesses 144 are protected.

[0085] The connecting section 132 of the receiving elements 130 each comprises a tongue and groove connection 148 comprising at least six parts, with at least six tongues 150 and correspondingly at least six grooves 152.

[0086] By means of the tongue and groove connections 148, an undesired rotation of the receiving elements 130 against each other can be effectively prevented.

[0087] The springs 150 and the grooves 152 are designed such that rotation of the receiving elements 130 relative to one another is effectively prevented even if the receiving elements 130 do not fully abut one another at the connecting sections 132.

[0088] This provides a compensation option for compensating for a manufacturing tolerance during the manufacture of the protective device 104 and / or the transport and storage device 106.

[0089] The tongues 150 are preferably smaller than the corresponding grooves 152 so that the tongue-and-groove connections 148 move smoothly.

[0090] The total height h1 of each receiving element 130 is the sum of the inner cylinder height h3, which essentially corresponds to half the length of the interior space 142 of the transport and storage device 106 in the assembled state thereof, the protective ring height h2 of a protective ring 154, which is formed by the projection 146 in the fastening region 134 of the receiving elements 130, and the tolerance height h4 of the tongue and groove connections 148.

[0091] The protective ring height h2 of the protective ring 154 is selected such that it is greater than the extension of the connecting devices 114 in the axial direction of the pressure vessels 102 along the longitudinal center axis 164 beyond an edge of the protective device 104, so that the connecting devices 114 do not protrude beyond the fastening area 134 of the receiving elements 130.

[0092] Due to the tolerance level h4, an adaptation to manufacturing tolerances of both the protective device 104 and the transport and storage device 106 can be made.

[0093] In principle, the receiving elements 130 can be designed to be continuous on the circumference, so that the interior space 142 is closed in the assembled state of the transport and storage device 106 with the exception of the recesses 144.

[0094] In the Fig. In the embodiment shown in Figures 5 to 8, however, no such solid design is provided. Rather, each of the receiving elements 130 comprises a plurality of compression rods 156, for example, six to twelve compression rods 156, which connect the connecting section 132 to the fastening area 134 of the receiving elements 130. For additional stabilization of the compression rods 156, annular transverse frames 158 are also provided.

[0095] As in particular the Fig. 5 and Fig. 6, the fastening openings 136 in the fastening area 134 of each receiving element 130 are provided with recesses 160 in which, for example, approximately 10 mm to approximately 15 mm wide tensioning belts 162 of the fastening device 138 run in the assembled state of the transport and storage device 106.

[0096] The tensioning belts 162 are not guided through fastening openings 136 arranged opposite one another with respect to the longitudinal center axis 164 of the receiving elements 130, so that the tensioning belts 162 do not run over the recesses 144 in the receiving elements 130 and thus unhindered access to the connection devices 114 of the pressure vessel 102 is ensured.

[0097] The manufacture of the storage device 100 described above works as follows: A commercially available pressure vessel 102 with the connection devices 114 ( Fig. 2) is prepared for the arrangement of the protective sheath 124 by providing the connecting devices 114 with temporary covers 166 in order to prevent contamination of the connecting device 114 during the manufacture of the protective sheath 124.

[0098] As in particular Fig. As can be seen from Figure 3, the substantially cylindrical protective sheath 124 is then applied to the pressure vessel 102, in particular, foamed onto it. A plastic material is preferably used that produces a closed-pore foam, with the foam hardness preferably increasing toward the outside due to a graduated application of the protective sheath 124.

[0099] The thickness of the protective sheath 124 after its completion is preferably approximately 3 cm in the region of the cylindrical portion 108.

[0100] Then, as in Fig.4, the intermediate layer 126 is applied to the protective sheath 124. This intermediate layer 126, which may be formed as a woven sheath, can be held in position by means of a low-temperature shrink sleeve with a hard surface.

[0101] To complete the protective device 104, the safety sleeve 128 is slid onto the intermediate layer 126 and the protective sleeve 124 and secured to the intermediate layer 126 and the protective sleeve 124 by heating the safety sleeve 128.

[0102] The temporary covers 166 can then be removed from the connecting devices 114.

[0103] The receiving elements 130 are pushed from both sides onto the protective device 104 and the pressure vessel 102 arranged therein, so that the protective device 104 with the pressure vessel 102 is received in the interior 142 of the transport and storage device 106 without play.

[0104] A plurality of tensioning belts 162 of the fastening device 138 are now guided through the fastening openings 136 in the fastening areas 134 and then tensioned, whereby the receiving elements 130 are pressed against one another and thus fixed to one another.

[0105] A rotation of the receiving elements 130 relative to each other is effectively prevented due to the interlocking tongue and groove connections 148.

[0106] The storage device 100 thus produced enables safe storage of pressurized gas in the pressure vessel 102 due to the protective device 104.

[0107] In particular, if the fastening openings 136 in the fastening regions 134 of the receiving elements 130 are designed to be large enough, the fastening openings 136 can serve as handles 168, so that easier handling of the storage device 100 is possible.

[0108] Particularly due to the transport and storage device 106, particularly simple handling of the storage device 100 is then possible.

[0109] The storage device 100 is intended for use as both a stationary and a mobile storage device.

Claims

[1] Protective device (104) for a pressure vessel (102) for storing a pressurized gas, comprising - a protective cover (124) for enclosing the pressure vessel (102) and - a safety sheath (128) for enclosing the protective sheath (124), the safety sheath (128) comprising a material that contracts under the influence of heat. [2] Protective device (104) according to claim 1, characterized by that the protective cover (124) comprises a foam material. [3] Protective device (104) according to one of claims 1 or 2, characterized by that the protective cover (124) can be or is fixed in a form-fitting manner to the pressure vessel (102). [4] Protective device (104) according to one of claims 1 to 3, characterized by that the safety cover (128) comprises a plastic material, in particular a cross-linked plastic material. [5] Protective device (104) according to one of claims 1 to 4, characterized bythat the safety sheath (128) is designed at least in sections as a shrink tube. [6] Protective device (104) according to one of claims 1 to 5, characterized by that between the protective cover (124) and the safety cover (128) at least one additional intermediate layer (126) surrounding the protective cover (124) is arranged. [7] Protective device (104) according to claim 6, characterized by that at least one intermediate layer (126) comprises fibers and / or a woven material. [8] Protective device (104) according to one of claims 1 to 7, characterized by that the protective device (104) comprises a transport and storage device (106) which comprises at least two releasably connectable receiving elements (130) for receiving the protective device (104) and the pressure vessel (102) arranged therein. [9] Protective device (104) according to claim 8, characterized bythat the at least two receiving elements (130) are identical to one another. [10] Protective device (104) according to one of claims 8 or 9, characterized by that in at least one of the receiving elements (130) at least one recess (144) is provided for the passage of at least one connection device (114) of the pressure vessel (102). [11] Protective device (104) according to one of claims 8 to 10, characterized by that the transport and storage device (106) has at least one projection (146) which, in the mounted state of the protective device (104), extends further away from the pressure vessel (102) in a direction than a connecting device (114) of the pressure vessel (102) extends away from the pressure vessel (102) in this direction. [12] Storage device (100) for storing a pressurized gas, comprising at least one pressure vessel (102) and at least one protective device (104) according to one of claims 1 to 11. [13] A method for protecting a pressure vessel (102), comprising: - arranging a protective sheath (124) on the pressure vessel (102); - Arranging a safety sheath (128) on the protective sheath (124), wherein the safety sheath (128) comprises a material which contracts under the influence of heat. [14] Method according to claim 13, characterized by that the safety sheath (128) is heated in order to fix the safety sheath (128) to the protective sheath (124). [15] Method according to claim 14, characterized by that before carrying out the heating process, at least one intermediate layer (126) is inserted between the protective sheath (124) and the safety sheath (128). [16] Method according to one of claims 13 to 15, characterized by that the pressure vessel (102) is foamed with a foam to produce the protective cover (124).

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