Fuel tank for use with generator

Abstract

There is disclosed a fuel container apparatus for use with an electricity generator, the fuel container apparatus comprising: a fuel pressure vessel 103 configured to contain a fuel in fluid form under pressure; and a frame 104 arranged to surround the fuel pressure vessel; wherein: the frame is fixed to the fuel pressure vessel; the frame comprises a base surface facing side 106 configured to face a base surface, on which the fuel container apparatus is to rest, when the fuel container apparatus is in an upright orientation; the base surface facing side is configured to contact the base surface in the upright orientation to support the fuel container apparatus.

Description

[0001] The present disclosure relates to a fuel container apparatus for use with an electricity generator. Background

[0002] Generators which generate electricity through the consumption of a fuel typically draw a fuel in fluid form from a fuel container such as a fuel vessel or tank. The fuel vessel may comprise a set of valves through which gas and / or liquid can be exchanged with the fuel vessel. For example, there may be a valve through which the electricity generator draws fuel from the fuel vessel. The fuel vessel may contain the fuel under pressure. The fuel contained within the fuel vessel may be partly in gas form and may be partly in liquid form. A majority of the body of the fuel vessel may be cylindrical, for example.

[0003] Such fuel vessels are typically expected to remain stationary when containing the fuel. For example, the fuel vessel may be emptied prior to transport for various reasons. For example, only certain vessels meeting certain criteria may be allowed to be used for transporting fluids under pressure, according to laws and / or regulations. For example, it may be required that the vessel have enough stability to maintain orientation given the forces applied to it during transport. A vessel which does not meet the requisite criteria may be emptied prior to transport. Fuel vessels which are used to supply fuel to electricity generators must be emptied prior to transport. The present invention addresses issues relating to movement and transportation of apparatus containing fuel under pressure. Summary

[0004] According to a first aspect of the present disclosure, there is provided a fuel container apparatus for use with an electricity generator, the fuel container apparatus comprising: a fuel pressure vessel configured to contain a fuel in fluid form under pressure; and a frame arranged to surround the fuel pressure vessel; wherein: the frame is fixed to the fuel pressure vessel; the frame comprises a base surface facing side configured to face a base surface, on which the fuel container apparatus is to rest, when the fuel container apparatus is in an upright orientation; the base surface facing side is configured to contact the base surface in the upright orientation to support the fuel container apparatus.

[0005] Advantageously, providing a frame fixed to the vessel provides a large base of support to the fuel container apparatus. For example, the frame greatly enhances the chances of the fuel container apparatus maintaining its orientation during transport, independently of the shape of the fuel pressure vessel itself. For example, the fuel pressure vessel cannot roll in a storage area of a vehicle. The frame may also advantageously provide a separation between the fuel pressure vessel and the base surface (and other surfaces, such as walls) of the storage area of the vehicle. This reduces risk of the vessel being penetrated by an object or structure, for example, in an accident scenario. The frame also provides clearance for valves of the fuel pressure vessel such that the valves do not contact or catch on another object and the like.

[0006] Provision of the frame fixed to the vessel in accordance with this disclosure makes the fuel container apparatus suitable for transport while containing a quantity of fuel. For example, the fuel container apparatus according to the present disclosure does not need to be emptied prior to transport. In addition, advantageously, the frame allows empty fuel container apparatuses to be transported while stacked one on top of another. Therefore, when empty and not transported any fluid, a plurality of the fuel container apparatuses can be transported in a space efficient manner.

[0007] Optionally, the frame comprises tubing arranged to define the borders of the frame.

[0008] Advantageously, the use of tubing provides flexibility of construction in that tubing (e.g., metal tubing) is widely available in various sizes, cross-sectional shapes, gauges and the like. Techniques for constructing structures out of tubing can be used to construct the frame of the present disclosure, according to the fuel pressure vessel it is intended for.

[0009] Optionally, the tubing comprises steel. Advantageously, steel provides a good level of structural strength for the frame to support the fuel pressure vessel, while filled with fluid, during transport. The steel tubing can be welded together to provide a strong structure.

[0010] Optionally, the fuel container apparatus comprises two or more support feet, wherein the support feet are configured to contact the base surface in the upright orientation to support the fuel container apparatus.

[0011] Advantageously, the support feet enhance the support provided to the fuel container apparatus and make tipping over less likely.

[0012] Optionally, each of a plurality of the two or more support feet comprises an elongate portion having an elongate portion longitudinal axis configured to be parallel, or close to parallel, to the base surface when the fuel container apparatus is in the upright orientation.

[0013] Advantageously, the elongate support feet extend the area of support provided by the support feet. For example, the elongate support feet may be arranged in various ways according to how the stability is desired to be improved.

[0014] Optionally, each of two or more of the elongate portions comprise an elongate portion opening configured to receive a fork of a forklift in a direction parallel to the respective elongate portion longitudinal axis.

[0015] Advantageously, there are provided structures to engage with a forklift so that the fuel container apparatus can easily and conveniently me manipulated and moved using a forklift. In this manner, the fuel container apparatus can be moved without its orientation having to change (which may be undesirable when the vessel is filled with fuel, for example). In addition, the fuel container apparatus can be moved using conventional forklifts and does not require specialist equipment to be moved.

[0016] Optionally, the elongate portions are fixed to the fuel pressure vessel.

[0017] Advantageously, fixing the elongate portions of the support feet to the fuel pressure vessel provides additional flexibility in the location and orientation of the elongate portions. This expands the possible configurations of the support feet.

[0018] Optionally, each of the two or more support feet comprises one or more support foot welded joints which fix the respective elongate portion to the fuel pressure vessel.

[0019] Advantageously, the support feet are fixed via welded joints. The welded joints provide a strong means of fixation which can withstand loads to be expected from a filled fuel pressure vessel.

[0020] Optionally, the elongate portions form part of the base surface facing side of the frame.

[0021] Advantageously, the elongate portions can alternatively be fixed to the frame. In this manner structures providing a large base of support can form part of the base surface facing side of the frame. The frame is a strong and stable structure and fixing the support feet directly to said strong stable structure enhances stability. In addition, in examples, where there are provided elongate portion openings for forklifts, the force from the forklift is applied directly to the frame, which is a strong and stable structure, rather than to the vessel.

[0022] Optionally, the base surface facing side comprises a plurality of base surface contact portions configured to contact the base surface in the upright orientation to support the fuel container apparatus on the base surface; and the base surface contact portions are arranged at or close to respective regions of the base surface facing side farthest away from a centre of the fuel pressure vessel.

[0023] Advantageously, providing base surface contact portions provides specific parts of the base surface facing side which are intended to contact the base surface. Therefore, it is not necessary for the entire base surface facing side to contact the base surface. This means that a large base of support can be provided without requiring a large contact surface area which might cause a lack of stability on an uneven base surface. In addition, the contact portions may also provide a separation between the rest of the base surface facing side and the base surface, and a greater separation between the vessel and the base surface. Accordingly, the vessel can be kept away from contacting structures or items present on the base surface.

[0024] Optionally, the frame is fixed to the fuel pressure vessel at a plurality of frame welded joints.

[0025] Advantageously, the plurality of frame welded joints provides stable and reliable fixation between the frame and the fuel pressure vessel. The frame welded joints provide a means of connection suitable for the loads exhibited by the filled fuel pressure vessel.

[0026] Optionally, each frame welded joint comprises a frame connector arm that is welded at a first end to the fuel pressure vessel, and is welded at a second end to the frame.

[0027] Advantageously, providing frame connector arms allows for an extended welded joint. In this way, the frame does not need to be welded directly to the vessel, which allows for a larger and more stable frame.

[0028] Optionally, the first end of each frame connector arm is shaped to match the curvature of a respective location on the fuel pressure vessel, where said first end is to be welded.

[0029] Advantageously, the first ends being shaped according to the curvature of the vessel provides for a large portion of the frame connector arm which can form a weld against the vessel. This provides for a strong weld and therefore a strong connection of the vessel to the frame.

[0030] Optionally, the fuel container apparatus comprises a plurality of connector elements configured to fix the fuel pressure vessel to the frame.

[0031] Advantageously, there can be connector elements which are used to fix the vessel to the frame using fixings. The connector elements may advantageously allow the vessel to be detached from the frame. The connector elements may be used where the vessel is for smaller volumes of fuel and the connection between the frame and the vessel requires less strength.

[0032] Optionally, the frame defines a plurality of backup support sides, the backup support sides configured to be perpendicular, or close to perpendicular, to the base surface when the fuel container apparatus is in the upright orientation; and the backup support sides are configured to support the fuel container apparatus on the base surface when in an orientation 90 degrees different to the upright orientation.

[0033] Advantageously, there is a large base of support provided by the backup support sides so that there is relative stability even if an event has occurred which caused the fuel container apparatus to tip over such that the orientation changed by 90 degrees.

[0034] Optionally, the frame comprises a plurality of connecting structures on an upward facing side, which upward facing side is a side of the frame opposite to the base surface facing side; and the plurality of connecting structures is configured to connect to a lifting apparatus.

[0035] Advantageously, the connecting structures provide a way to connect to a lifting apparatus. Therefore, a strong and stable physical manner of lifting the fuel container apparatus is provided. If lifting apparatus which connects to the top of an object can be used, this provides flexibility in being able to move the fuel container apparatus in a desired way. For example, the fuel container apparatus may be lifted to a greater height than allowed by a forklift.

[0036] Optionally, the fuel pressure vessel comprises a set of valves suitable for use on a pressure vessel to be used for transporting a fluid under pressure.

[0037] Advantageously, valves suitable for transportation of fluids under pressure are deployed. Accordingly, the fuel container apparatus is further adapted to be transported without the need to be emptied first.

[0038] Optionally, the frame is configured to provide a larger area of the base surface over which the fuel container apparatus is supported as compared to the fuel pressure vessel itself.

[0039] Advantageously, there is provided stability and reduced likelihood of a change in orientation of the fuel container apparatus during transport.

[0040] According to a second aspect of the present disclosure, there is provided a method of transporting a fuel in fluid form under pressure, the method comprising: transporting the fuel within a fuel container apparatus for use with an electricity generator, the fuel container apparatus being according to the first aspect.

[0041] Advantageously, the fuel container apparatus according to the first aspect is used to transport the fuel. In this way, the fuel can be transported within a vessel from which it can directly be supplied to an electricity generator, e.g., without first having to be transferred from a transportation container to another container. Furthermore, the fuel container apparatus does not need to be emptied prior to transport.

[0042] Optionally, in the method according to the second aspect, the fuel pressure vessel comprises a set of valves suitable for use on a pressure vessel to be used for transporting a fluid under pressure, and the method comprises: connecting the fuel pressure vessel to an electricity generator via one of the set of valves to supply the fuel to the electricity generator.

[0043] Advantageously, the fuel container apparatus, in which the fuel may be transported, is directly used to supply an electricity generator, thus saving cost, time and being more convenient. Brief Description of the Drawings Examples of the present disclosure will now be described with reference to the accompanying drawings, in which: Figure 1 is a simplified schematic sketch of a fuel container apparatus, according to examples; Figure 2 is a schematic perspective view of an elongate tubing element, according to examples; Figure 3 is a schematic perspective view of a first fuel container apparatus according to examples; Figure 4 is a schematic bottom-up view of the first fuel container apparatus, according to examples; Figure 5 is a schematic front view of the first fuel container apparatus, according to examples; Figure 6 is a schematic side view of the first fuel container apparatus, according to examples; Figure 7 is a schematic perspective view of a second fuel container apparatus, according to examples; Figure 8 is a schematic front view of the second fuel container apparatus, according to examples; Figure 9 is a schematic side view of the second fuel container apparatus, according to examples; Figure 10 is a schematic top-down view of the second fuel container apparatus, according to examples; Figure 11 is a schematic cross-sectional view showing a connector element, according to examples; Figure 12 is a schematic side view of multiple of the first fuel container apparatuses stacked one on top of another, according to examples; and Figure 13 is a schematicfrontviewof multiple of the first fuel container apparatuses stacked one on top of another, according to examples. Detailed Description

[0044] The present disclosure relates to a fuel container apparatus for use with an electricity generator. The fuel container apparatus comprises a fuel pressure vessel configured to contain a fuel in fluid form under pressure. The fuel container apparatus also comprises a frame arranged to surround the fuel pressure vessel, wherein the frame is fixed to the fuel pressure vessel. The frame comprises a base surface facing side configured to face a base surface, on which the fuel container apparatus is to rest, when the fuel container apparatus is in an upright orientation. The base surface facing side is configured to contact the base surface in the upright orientation to support the fuel container apparatus.

[0045] Figure 1 is a simplified schematic sketch of a fuel container apparatus 100, according to examples. In these examples, there is provided the fuel pressure vessel 102. The fuel pressure vessel 102 is configured to contain a fuel in fluid form. As referred to herein, the fluid form may be a liquid form or a gaseous form. In some examples, the fuel pressure vessel 102 may contain some of the fuel in liquid form and some of the fuel in gaseous form. In some examples, the fuel is liquid petroleum gas, petrol, diesel, kerosene, gasoline, a fuel comprising hydrogen, and the like.

[0046] The fuel pressure vessel 102 is configured to contain the fuel under pressure. For example, the fuel pressure vessel 102 is pressure sealed. As referred to herein, containing the fuel under pressure means that the pressure inside the fuel pressure vessel 102 is greater than atmospheric pressure when the fuel is being held in the fuel pressure vessel 102 under pressure. For example, the fuel pressure vessel may be a tank with a circular cross section perpendicular to its longitudinal axis.

[0047] In these examples, there is provided the frame 104. The base surface may be any surface on which the fuel container apparatus 100 is to rest. For example, the base surface may be the ground, a floor inside a building, the floor of a container attached to a vehicle, and the like. The frame 104 comprises the base surface facing side 106. When the fuel container apparatus 100 is in the upright orientation, the base surface facing side 106 faces the base surface in question. For example, the upright orientation is defined as the orientation in which the base surface facing side 106 faces the base surface (such as the floor, for example).

[0048] For example, the base surface facing side 106 is configured to contact the base surface in the upright orientation to support the fuel container apparatus 100. For example, the base surface facing side 106 may have a plurality of contact portions and / or support feet which contact the base surface to support the fuel container apparatus 100, as described further below.

[0049] As described, the fuel pressure vessel 102 is fixed to the frame 104. For example, the frame 104 is configured to provide a larger area of the base surface over which the fuel container apparatus 100 is supported as compared to the fuel pressure vessel 102 itself. In other words, the frame 104 fixed to the fuel pressure vessel 102 is configured to provide a larger base of support on the base surface to the fuel container apparatus 100 as compared to the fuel pressure vessel 102 alone. For example, the frame 104 is configured to provide contact points with the base surface in the upright orientation, which delimit a larger surface area than a surface area of the fuel pressure vessel 102 on its own which would be in contact with the base surface. It should be noted that this does not necessarily mean that the entirety of the base surface facing side 106 is configured to be in contact with the base surface (although in some examples that may be the case). The larger surface area of support may be provided by arranging a plurality of contact points, configured to contact the base surface, positioned appropriately as part of the base surface facing side 106 so as to provide said larger surface area of support.

[0050] Also, for example, a vessel having a part or whole of its body which is cylindrical may easily roll or slide on a base surface. Such movement may readily occur when the vessel is being transported in a container connected to a vehicle, for example. However, the provision of the frame 104 advantageously provides a more stable orientation for the fuel container apparatus 100. For example, provision of the frame 104 may inhibit the fuel container apparatus 100 from tipping over (in other words, changing its orientation). In some examples, the large base of support provided by the frame 104 reduces the likelihood of the fuel container apparatus 100 tipping over such that it is less likely to pivot by 90 degrees and end up being supports by a side of the frame 104 which is perpendicular to the base surface facing side 106.

[0051] The stability of the orientation of the fuel container apparatus 100 is enhanced independently of the shape of the fuel pressure vessel 102, for example. The frame may also advantageously provide a separation between the fuel pressure vessel and the base surface (and other surfaces, such as walls) of the storage area of the vehicle. Provision of the frame fixed to the vessel in accordance with this disclosure makes the fuel container apparatus suitable for transport while containing a quantity of fuel. For example, the fuel container apparatus according to the present disclosure does not need to be emptied prior to transport.

[0052] In some examples, the frame 104 comprises tubing 108 arranged to define the borders of the frame 104. Parts of the frame 104 not defining the borders may also comprise the tubing 108. For example, the frame 104 may be constructed from tubing. For example, metal tubing may be used. In some examples, the tubing comprises steel. In other examples, the tubing may comprise other metallic materials and / or non-metallic materials.

[0053] In the examples of Figure 1, the frame 104 comprises the tubing 108. The tubing 108 comprises elongate tubing elements, each having a respective largest spatial dimension along a longitudinal axis. In other words, the longitudinal axis of each elongate tubing element, as referred to herein, corresponds to the length of said elongate tubing element, where the length is the largest of the spatial dimensions.

[0054] The elongate tubing elements may have various different cross-sectional shapes perpendicular to the longitudinal axis. For example, the tubing may have a closed polygonal cross section perpendicular to the longitudinal axis (for example, rectangular).

[0055] Figure 2 is a schematic perspective view of an elongate tubing element 200, according to examples. In these examples, the elongate tubing element 200 has a rectangular cross section (for example, a square cross section, which is a specific case of a rectangle) perpendicular to its longitudinal axis 202.

[0056] For example, starting from a number of individual metal tubing elements 200 of a desired cross section, size, wall thickness etc. (suitable for the purpose of constructing the frame 104 to support the fuel container apparatus 100), the metal tubing elements may be joined together to provide the constructed tubing 108 in order to provide the frame 104, as desired. For example, the physical characteristics of the elongate tubing elements are chosen taking account of the amount of load to be placed on the frame 104 when supporting the fuel pressure vessel 102 full of fuel. For example, the metal tubing elements may be welded together. For example, techniques such as hand welding, robotic welding, laser welding and the like may be used.

[0057] In some examples, the fuel container apparatus 100 comprises two or more support feet. In these examples, the support feet are configured to contact the base surface in the upright orientation to support the fuel container apparatus 100. As previously described, the base surface facing side 106 contacts the base surface in the upright orientation to support the fuel container apparatus 100. In some examples comprising the two or more support feet, the two or more support feet form part of the base surface facing side 106 of the frame 104 (in other words, part of the frame 104 itself). In these examples, the support feet are parts of the base surface facing side 106 which contact the base surface. However, in some other examples, the two or more support feet do not form part of the base surface facing side 106 of the frame 104. For example, the two or more support feet may be provided on a part of the fuel container apparatus 100 other than the frame 104, as described further below.

[0058] Figure 3 is a schematic perspective view of a first fuel container apparatus 300, according to examples. The first fuel container apparatus 300 is a more specific example of the fuel container apparatus 100 described above in relation to Figure 1. In the examples of Figure 3, the two or more support feet are provided on the fuel pressure vessel 102 (for example, by being fixed to the fuel pressure vessel 102).

[0059] In some examples, each of a plurality of the two or more support feet comprises an elongate portion having an elongate portion longitudinal axis. In such examples, the elongate portion longitudinal axis (of each elongate portion) is configured to be parallel, or close to parallel, to the base surface when the fuel container apparatus 100 is in the upright orientation. For example, where there are two support feet, said plurality comprises the two support feet such that both support feet comprise an elongate portion. For example, where there four support feet, each of said plurality (the plurality meaning each of two of the four support feet, alternatively each of three of the four support feet, alternatively each of all four of the support feet) comprise respective elongate portions. In other words, whatever the number of support feet provided, a plurality of those support feet (meaning two or more) comprises elongate portions.

[0060] In the examples of Figure 3, the first fuel container apparatus 300 comprises two first support feet 302 fixed to the fuel pressure vessel 102. Each first support foot 302 comprises a first elongate portion 304 having an elongate portion longitudinal axis 306. The elongate portion longitudinal axis 306 corresponds to the largest spatial dimension of the respective first elongate portion 304. In these examples, the first elongate portions 304 are in the form of tubing (for example metal tubing). In these examples, the metal tubing of the first elongate portions 304 has a rectangular cross section. In these examples, the rectangular cross section of the first elongate portions 304 is shaped and arranged such that the longer sides of the rectangular cross-section face the base surface and the fuel pressure vessel 102. Here, the term first support feet, first elongate portion and the like are used to refer to features in relation to the example of the first fuel container apparatus 300. The term “first” in this context should not be read as referring to a single element. For example, there may be two or more “first support feet” as shown in the figures.

[0061] Figure 4 is a schematic bottom-up view of the first fuel container apparatus 300, according to examples. In the examples of Figure 4, the first elongate portions 304 can be seen. The view of Figure 4 is a view facing the base surface facing side 106 of the frame 104. The elongate portion longitudinal axes 306 are indicated using dashed lines.

[0062] For example, the first elongate portions 304 of the first support feet 302 contact the base surface and provide support to the first fuel container apparatus 300. Advantageously, the first support feet 302 increase the contact surface area with the base surface to enhance the support provided to the first fuel container apparatus 300, and to enhance the stability of the first container apparatus 300 (for example, against tipping over).

[0063] For example, the first support feet 302 comprising elongate portions 304 advantageously provides a wide base of support. In the examples of Figures 3 and 4, the generally rectangular base surface facing side 106 has a width W less than a length L, as labelled in Figure 4. In these examples, the first elongate portions 304 are arranged parallel, or close to parallel to the width W of the base surface facing side 106. It will be appreciated that tipping over of the first fuel container apparatus 300 is more likely in a manner so that the width W changes angle relative to the base surface. In other words, tipping over is more likely due to rotation about an axis parallel to the length L as opposed to an orthogonal rotation. Accordingly, arranging the first elongate portions 304 along the width W advantageously improves stability with respect to the direction in which tipping over is otherwise more likely.

[0064] In some examples, each of two or more of the elongate portions comprise an elongate portion opening. In these examples, the elongate portion opening is configured to receive a fork of a forklift in a direction parallel to the respective elongate portion longitudinal axis. For example, where there are two elongate portions, said “two or more” of the elongate portions naturally comprise both of the elongate portions. For example, where there four elongate portions, each of said two or more (meaning each of two of the four elongate portions, alternatively each of three of the four elongate portions, alternatively each of all four of the elongate portions) comprise a respective elongate portion opening. In other words, whatever the number of elongate portions provided, two or more of those elongate portions comprise an elongate portion opening. The purpose of the elongate portion openings is to receive forks of a forklift. It will be appreciated that forklifts typically have two forks. Therefore providing at least two elongate portion openings is appropriate for cooperation with a forklift. However, where there are more than two elongate portion openings provided, a forklift user may have a choice of using any two appropriately spaced elongate portion openings to cooperate with the forks of the forklift.

[0065] In the particular example of Figures 3 and 4, there are two first elongate portions 304 provided. In these examples, each of the two first elongate portions 304 comprise an elongate portion opening 308. The first elongate portions 304 may be spaced apart with respect to the length L according to the types of forklifts intended to be deployed on the first fuel container apparatus 300, for example.

[0066] Advantageously, elongate portions configured with the described openings provide an effective and stable construction for a forklift to lift and manoeuvre the first fuel container apparatus 300.

[0067] In some examples, the elongate portions are fixed to the fuel pressure vessel 102. In the examples of Figures 3 and 4, the two first elongate portions 304 are fixed to the fuel pressure vessel 102 of the first fuel container apparatus 300. The first elongate portions 304 may be fixed to the fuel pressure vessel 102 using a suitable method taking into account the physical size, weight, etc. of the first fuel container apparatus 300 and its components.

[0068] In some examples, each of the two or more support feet comprises one or more support foot welded joints which fix the respective elongate portion to the fuel pressure vessel 102. Figure 5 is a schematic front view of the first fuel container apparatus 300, according to examples. Figure 6 is a schematic side view of the first fuel container apparatus 300, according to examples. In the examples of the first fuel container apparatus 300 shown in the Figures, each first support foot 302 comprises two support foot welded joints 502. Accordingly, for each first elongate portion 304, there are two points at which it is fixed to the fuel pressure vessel 102.

[0069] In these examples, each support foot welded joint 502 comprises a support foot connector arm 504. Each support foot connector arm 504 extends between the respective first elongate portion 304 and the fuel pressure vessel 102. For example, the support foot connector arms 504 may comprise metal (such as steel, for example). For example, the support foot connector arms 504 may comprise the same material as the elongate tubing elements 200.

[0070] The support foot connector arms 504 may be any shape, size, etc., suitable for supporting the fuel pressure vessel 102 on the first elongate portions 304. In some examples, each of the support foot connector arms 504 comprises a metal plate (e.g., a steel plate). In some examples, the metal plate comprises steel and has a thickness between 6 and 8 millimetres thick. The thickness of the metal plate may be selected according to the specific metal used and the load expected to be supported by said metal plate, for example.

[0071] For example, the support foot connector arms 504 are welded to the fuel pressure vessel 102 at a first end, and welded to the respective elongate portions 304 at a second end. For example, the first end of the support foot connector arms 504 is shaped according to the curvature of the fuel pressure vessel 102. For example, each of the support foot connector arms 504 has the first end shaped to match the curvature of a surface portion of the fuel pressure vessel 102, where said first end is intended to be fixed to the fuel pressure vessel 102. Advantageously therefore, the first ends can be securely fixed to the fuel pressure vessel 102 taking account of the shape of the fuel pressure vessel 102. In other words, contact surface area between the first end and the vessel 102 may be maximized.

[0072] In the examples of Figures 3 to 6, the first elongate portions 304 have a rectangular cross-section perpendicular to the respective elongate portion longitudinal axes 306. A substantially flat side of the first elongate portions 304 faces the fuel pressure vessel 102, in these examples. Therefore, the second ends of the support foot connector arms 504 are shaped and arranged according to the surface of the respective elongate portions 304 on which they are intended to be fixed.

[0073] In some examples, the elongate portions form part of the base surface facing side 106 of the frame 104. In these examples, the elongate portions form part of the frame and / or are directly fixed to the frame 104. In these examples, the elongate portions may optionally also be fixed to the fuel pressure vessel 102. Figure 7 is a schematic perspective view of a second fuel container apparatus 700, according to examples. The second fuel container apparatus 700 is a more specific example of the fuel container apparatus 100 described in relation to Figure 1. Figure 8 is a schematic front view of the second fuel container apparatus 700, according to examples. Figure 9 is a schematic side view of the second fuel container apparatus 700, according to examples. Figure 10 is a schematic top-down view of the second fuel container apparatus 700, according to examples. In Figures 7 to 10 (and later introduced Figures illustrating examples of the second fuel container apparatus 700), the same reference numerals are used as in Figure 3 to 6 for like (although not necessarily identical) features. However, some different reference numerals are used for certain features for which examples different to those previously discussed are described.

[0074] In the examples of the second fuel container apparatus 700, the elongate portions form part of the base facing side 106 of the frame 104, whereas in the first fuel container apparatus 300, the first elongate portions 304 are not fixed directly onto the frame 104.

[0075] In the examples of Figures 7 to 10, there are provided two second support feet 702 each comprising a second elongate portion 704 fixed directly to the frame 104. Similarly to the first fuel container apparatus 300, the elongate portions 704 have rectangular cross-sections perpendicular to respective elongate portion longitudinal axes 705. The second support feet 702 may comprise any of the features described above in relation to the first support feet 302.

[0076] In these examples, the fuel pressure vessel 102 may or may not be fixed to the second support feet 702. In other words, in some examples of the second fuel container apparatus 700, the second support feet 702 are fixed to the fuel pressure vessel 102. In some examples of the second fuel container apparatus 700, the fuel pressure vessel 102 contacts the second support feet 702 (e.g., the elongate portions 704 of the second support feet 702) such that some of the weight of the fuel pressure vessel 102 is directly supported on the second support feet 702. In some examples of the second fuel container apparatus 700, the fuel pressure vessel 102 does not directly contact the second support feet 702.

[0077] In the particular examples of Figures 7 to 10, a different arrangement of the frame 104 and the fuel pressure vessel 102 is shown to demonstrate another example arrangement. In these examples, the fuel pressure vessel 102 is arranged so that in the upright orientation, the longitudinal axis 707 of the fuel pressure vessel 102 is perpendicular to the base surface. This is in contrast to the examples of the first fuel container apparatus 300 shown in Figures 3 to 6 in which the longitudinal axis 307 of the fuel pressure vessel 102 is parallel to the base surface in the upright orientation. Either arrangement may be deployed according to the first fuel container apparatus 300 or the second fuel container apparatus 700.

[0078] In the examples of Figures 7 to 10, there are provided plate regions 703 on the second support feet 702 (although they may be provided on another part of the base surface facing side 106 in contact with the base surface). The plate regions 703 are substantially parallel to the base surface and comprise holes 705 for bolting the frame 104 to the base surface, for example. In these examples, the plate regions 703 are the parts of the second support feet 702 which contact the base surface. The plate regions 703 are fixed to the second elongate portions 704 at the bottom such that, in the upright orientation, the plate regions 703 are slightly closer to the base surface than the second elongate portions 704. Accordingly, in the examples, there is not contact with the base surface along the entire length of the second elongate portions. For example, this may mitigate instability where there is an uneven base surface, for example.

[0079] In some examples, the base surface facing side 106 comprises a plurality of base surface contact portions configured to contact the base surface in the upright orientation to support the fuel container apparatus 100 on the base surface. In the examples of the first fuel container apparatus 300 shown in Figures 3 to 6, there are provided the base surface contact portions 310. For example, the base surface contact portions 310 extend towards the base surface when in the upright orientation. In some examples, the base surface contact portions 310 are defined by an extension of the elongate tubing elements 200, which are intended to be perpendicular to the base surface in the upright orientation, the extension being past the remainder of the base surface facing side 106. In other words, the base surface contact portions 310 are the parts of the base surface facing side 106 closest to the base surface in the upright orientation. For example, when the frame 104 rests on the base surface in the upright orientation, the base surface contact portions 310 make contact with the base surface, and there is a separation between the base surface and the rest of the base surface facing side 106.

[0080] For example, the base surface facing side 106 may have a generally rectangular shape. In such examples, there may be provided at least four base surface contact portions. For example, there may be provided a base surface contact portion at or close to each of the corners of the rectangular shape. In the examples of Figures 3 to 6, there are provided four base surface contact portions 310.

[0081] In some examples, the base surface contact portions are arranged at or close to respective regions of the base surface facing side 106 farthest away from a centre of the fuel pressure vessel 102. For example, the base contact surface portions 310 of the examples of Figures 3 to 6 are provided at the corners of the rectangular shape of the base surface facing side 106. It will be appreciated that the frame 104 surrounds the fuel pressure vessel 102 and the corners of said rectangular shape are some of the points of the frame 104 farthest from the centre of the fuel pressure vessel 102. By positioning the base contact surface portions 310 to be far away from the centre of the vessel 102, a wide base of support is provided to reduce the likelihood of the fuel container apparatus tipping over.

[0082] Advantageously, the base surface contact portions also create a separation between the base surface and the remainder of the frame 104. The base surface contact portions increase the separation between the base surface and the fuel pressure vessel 102. This advantageously reduces the likelihood of items or structures present on the base surface from contacting the fuel pressure vessel 102. For example, such contact may be undesired, especially during transport of the fuel container apparatus 100.

[0083] Furthermore, the base surface contact portions provide a large base of support without there being a large contact surface area with the base surface. For example, the base surface may not be level over the extent of the fuel container apparatus 100. For example, this lack of a level surface may cause the apparatus to rock if there is a large contact surface (e.g., during transport). The rocking may increase the chances of tipping over. However, provision of the base contact surface portions mitigates such effects of a base surface which is not level enough to avoid the described rocking. This mitigation may also be provided by the plate regions 703 of the second fuel container apparatus 700, as previously discussed.

[0084] In some examples, the frame 104 is fixed to the fuel pressure vessel 102 at a plurality of frame welded joints. The frame welded joints are joints which connect the frame 104 to the fuel pressure vessel 102 by means of welding. In the examples of the first fuel container apparatus 300 shown in Figures 3 to 6, there are provided a plurality of frame welded joints 312.

[0085] In these examples, each frame welded joint 312 comprises a frame connector arm 314 that is welded at a first end to the fuel pressure vessel 102, and is welded at a second end to the frame 104. Each frame connector arm 314 extends between the fuel pressure vessel 102 and the frame 104. For example, the frame connector arms 314 may comprise metal (such as steel, for example). For example, the frame connector arms 314 may comprise the same material as the elongate tubing elements 200.

[0086] The frame connector arms 314 may be any shape, size, etc., suitable for securely fixing the fuel pressure vessel 102 to the frame 104 such that the fuel pressure vessel 102 can be supported by the frame 104. In some examples, each of the frame connector arms 314 comprises a metal plate (e.g., a steel plate). In some examples, the metal plate comprises steel and has a thickness between 6 and 8 millimetres thick. The thickness of the metal plate may be selected according to the specific metal used and the load expected to be supported by said metal plate, for example.

[0087] For example, the first end of the frame connector arms 314 is shaped according to the curvature of the fuel pressure vessel 102. For example, each of the frame connector arms 314 has the first end shaped to match the curvature of a surface portion of the fuel pressure vessel 102, where said first end is intended to be fixed to the fuel pressure vessel 102. Advantageously therefore, the first ends can be securely fixed to the fuel pressure vessel 102 taking accountof the shape of the fuel pressure vessel 102.

[0088] The second end of each frame connector arm 314 is welded to the frame 104. In the examples of Figures 3 to 6, each frame connecter arm 314 is welded at the respective second end to one of the elongate tubing elements arranged to be perpendicular to the base surface in the upright orientation. A number and arrangement of frame welded joints 312 may be chosen according to the physical characteristics of the fuel pressure vessel 102 and the frame 104. For example, relevant physical characteristics may include the size of the vessel 102, the weight of the vessel 102 filled with fuel, and the like. In the examples of Figures 3 to 6, there are eight frame welded joints 312 with two frame welded joints connected to each of the four elongate tubing elements which are perpendicular to the base surface in the upright orientation.

[0089] In some examples, alternatively or in addition to the frame welded joints, the fuel container apparatus 100 comprises a plurality of connector elements configured to fix the fuel pressure vessel 102 to the frame 104. For example, the connector elements are components configured to fix the fuel pressure vessel 102 to the frame 104. For example, the connector elements may differ from the frame welded joints in that the connector elements fix to the fuel pressure vessel 102 and / or the frame 104 by a method other than welding. In some examples, the connector elements are akin to fixing brackets.

[0090] In the examples of Figures 7 to 10, the second fuel container apparatus 700 comprises the connector elements 706, as shown. Figure 11 is a schematic cross-sectional view showing the connector element 706. In these examples, the connector elements 706 each have a vessel connecting portion 708. The vessel connecting portion 708 comprises a plate with a surface configured to be welded onto the surface of the fuel pressure vessel 102. In these examples, the plate of the vessel connecting portion 708 has a curvature matching the curvature of the surface of the fuel pressure vessel 102, at the location where the vessel connecting portion 708 is to be welded. In this manner, the contact surface area between the vessel connecting portion 708 and the surface of the fuel pressure vessel 102 is enhanced. In these examples, a surface of the plate of the vessel connecting portion 708 which faces the vessel 102, is welded to the vessel 102.

[0091] On the other hand, in these examples, the connector elements 706 are fixed to the frame 104 using fixings 1102. For example, fixings such as screw, bolts and the like may be used. In these examples, each connector element 706 comprises a frame connecting portion 710 configured to be fixed to the frame 104 using fixings. In these examples, the frame connecting portion 710 comprises a plate which overlaps a surface of one of the elongate tubing elements of the tubing 108 comprised in the frame 104. In the examples of Figures 7 to 10, the frame connecting portion 710 comprises a plate which is substantially perpendicular to the plate of the vessel connecting portion 708. The plate of the frame connecting portion 710 is substantially parallel to a surface of the elongate tubing element to which it is to be fixed. For example, there may be through holes provided on the frame connecting portion 710 and the elongate tubing element to which said frame connecting portion 710 is to be fixed. The through holes are, for example, for receiving fixings such as bolts. In the examples of Figure 11, the fixings 1102 comprise a bolt 1104, a nut 1106 and washers 1108 positioned between the head of the bolt 1104 and an element which the bolt 1104 engages, and between the nut 1106 and an element which the bolt 1104 engages. In the examples of Figures 7 to 10, the frame connecting portion 710 is fixed to one of the elongate tubing elements using two bolts and respective nuts.

[0092] In some examples, the frame 104 defines a plurality of backup support sides. The backup support sides are configured to be perpendicular, or close to perpendicular, to the base surface when the fuel container apparatus 100 is in the upright orientation. For example, in the case of the frame 104 defining a generally cuboid shape, there are sides of said shape which are perpendicular to the base surface facing side 106. For example, these perpendicular sides (four in the case of a generally cuboid frame) are the backup support sides. The backup support sides are configured to support the fuel container apparatus on the base surface when in an orientation 90 degrees different to the upright orientation.

[0093] Advantageously, therefore, the sides of the frame 104 may also be configured such that each of these sides can support the fuel container apparatus 100, if the need arises. For example, even if the fuel container apparatus 100 tips over and the orientation changes by 90 degrees, there are provided back up support sides which provide that the frame 104 can still support the fuel container apparatus 100 on the base surface in a relatively stable manner. For example, because the frame 104 surrounds the fuel pressure vessel 102, even the backup support sides (which may be of a smaller size than the base surface facing side 106) provide a relatively large base of support as compared to the vessel 102 by itself.

[0094] In some examples, the frame 104 comprises a plurality of connecting structures on an upward facing side. For example, the upward facing side is a side of the frame 104 opposite to the base surface facing side 106. For example, the upward facing side is a side generally parallel to the base surface facing side 106. For example, the plurality of connecting structures is configured to connect to a lifting apparatus. In these examples, the connecting structures are intended for allowing the fuel container apparatus 100 to be lifted up.

[0095] For example, the connecting structures comprise one or more physical features which provide for physical engagement with the lifting apparatus. In the examples of Figures 3, 5 and 6, the first fuel container apparatus 300 comprises first connecting structures 316. For example, the first connecting structures 316 are metal (e.g., steel) plates fixed to the frame 104. In these examples, the plates of the first connecting structures 316 are formed into two portions at a roughly 90 degree angle to one another, and are fixed to corners of the frame 104. In these examples, each first connecting structure 316 comprises a pair of holes 318. The pair of holes 318 are the previously referenced physical features which provide for the physical engagement with the lifting apparatus. Those skilled in the art will appreciate the various ways in which such physical features may provide engagement for lifting (e.g., by means of hooks, etc.).

[0096] In the examples of Figures 7 to 10, the second fuel container apparatus 700 comprises second connecting structures 712. In these examples, the second connecting structures 712 are configured similarly to the first connecting structures 316, except that each of the second connecting structures 712 comprises a single hole 714 for engagement with the lifting apparatus. The physical features for engagement may be provided according to the type of lifting apparatus intended to be used to lift the fuel container apparatus, for example.

[0097] For example, the connecting structures (of any example) may be welded to the frame 104.

[0098] In some examples, the fuel pressure vessel 102 comprises a set of valves suitable for use on a pressure vessel to be used for transporting a fluid under pressure. Those skilled in the art will appreciate that different valves are used in the context of a pressure vessel not intended for transport, as compared to transporting a fluid under pressure (e.g., in a fluid carrying tanker vehicle, etc.). For example, the valves for transportation are designed to meet the demands of transporting fluids under pressure.

[0099] In the following description, the valves which are intended and specifically designed for the transportation of fluids under pressure are referred to as transport valves, merely for ease of reference and clarity. In some examples, the transport valves may protrude to a lesser extent from the vessel 102 as compared to other corresponding valves. In some examples, the transport valves may be constructed to be more robust as compared to other corresponding valves. Those skilled in the art will appreciate the specific differences.

[0100] In the examples of Figures 3 to 6, there is provided the following set of transport valves. There is provided a vapour valve 320 for feeding gas into the fuel pressure vessel 102 to increase pressure inside the fuel pressure vessel 102. The vapour valve 320 may comprise a fix level indicator, which acts as a mechanical failsafe to prevent overfilling. In these examples, there is also provided a liquid withdrawal valve 322 for degassing the fuel pressure vessel 102. There is a fill valve 324 for adding liquid fuel to the fuel pressure vessel 102. There is provided a content gauge 326 comprising a liquid level counter balance and weight for indicated the liquid level inside the fuel pressure vessel 102. In these examples, there is also provided a pressure relief valve 328 which functions as a gas outlet to relieve pressure from inside the vessel 102. For example, the pressure relief valve 328 may also comprise an emergency relief mechanism which vents if a threshold pressure is reached. The threshold pressure depends on various factors such as the thickness of the material from the which the fuel pressure vessel 102 is constructed and the like, and relates to the amount of internal pressure the fuel pressure vessel 102 is designed to withstand. In some examples, the threshold pressure is between 15 and 19 bars. In the examples of Figures 7 to 10, there is provided a set 716 of transport valves (not individually labelled in this case). Various different transport valves in various arrangements may be provided according to the type of fuel being transported and the characteristics of the fuel pressure vessel 102, for example.

[0101] In some examples, bores are cut into the fuel pressure vessel 102 for the transport valves to be installed. In some examples, laser cutting is used. In some examples, water jet cutting is used. There may be other cutting techniques, and those skilled in the art will appreciate how the bores may be made in a suitable manner. In the above description, there are described various components which comprise a metal plate (e.g., frame connector arms 314, support foot connector arms 504, first connecting structures 316, and second connecting structures 712). The metal plates may be cut to the required shape and size using any such cutting techniques, for example.

[0102] In some examples, the frame 104 and / or the fuel pressure vessel 102 has a polyurethane coating applied to it. For example, such a coating protects the frame 104 and / or the vessel 102 from corrosion. For example, the coating may guard against corrosion due to exposure to water and the like.

[0103] Advantageously, the frame 104 may allow fuel container apparatuses 100 to be stacked one on top of another. For example, the fuel container apparatuses 100 may be stacked when they do not contain fuel in order to be transported in a more space efficient manner. For example, the generally cuboidal profile of the frame 104 allows for the stacking. For example, where the first and / or second connecting structures 316, 712 are provided, their plates may be fixed to the frame 104 such that they do not obstruct the ends of the vertical tubing elements (vertical with respect to the upright orientation) at the boundaries of the frame 104. For example, in the case of the first fuel container apparatus 300, the contact portions 310 of one frame 104 may align and rest on vertical tubing elements of another frame 104. For example, the plates of the connecting structures may extend up from the upward facing side and provide support to the contact portions 310 of the frame 104 above to avoid relative lateral movement. Figure 12 is a schematic side view of multiple of the first fuel container apparatuses 300 stacked one on top of another, according to examples. Figure 13 is a schematic front view of multiple of the first fuel container apparatuses 300 stacked one on top of another, according to examples. The second fuel container apparatuses 700 may also be similarly stacked for transport while not containing fuel (or another fluid) under pressure.

[0104] In some examples, there may be provided a method of transporting a fuel in fluid form under pressure. For example, the method comprises transporting the fuel within a fuel container apparatus for use with an electricity generator, where the fuel container apparatus is according to any of the examples described herein. In examples where the fuel pressure vessel 102 comprises a set of valves suitable for use on a pressure vessel to be used for transporting a fluid under pressure, the method may comprise connecting the fuel pressure vessel 102 to an electricity generator via one of the set of valves to supply the fuel to the electricity generator.

[0105] In the above description, various specific examples are described. Attention is directed to all papers and documents which are filed concurrently with or previous to this specification in connection with this application and which are open to public inspection with this specification, and the contents of all such papers and documents are incorporated herein by reference.

[0106] All of the features disclosed in this specification (including any accompanying claims, abstract and drawings), and / or all of the steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of such features and / or steps are mutually exclusive.

[0107] Each feature disclosed in this specification (including any accompanying claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly stated otherwise. Thus, unless expressly stated otherwise, each feature disclosed is one example only of a generic series of equivalent or similar features.

[0108] The invention is not restricted to the details of the foregoing example(s). The 5 invention extends to any novel one, or any novel combination, of the features disclosed in this specification (including any accompanying claims, abstract and drawings), or to any novel one, or any novel combination, of the steps of any method or process so disclosed.

Claims

1. A fuel container apparatus for use with an electricity generator, the fuel container apparatus comprising:a fuel pressure vessel configured to contain a fuel in fluid form under pressure; anda frame arranged to surround the fuel pressure vessel;wherein:the frame is fixed to the fuel pressure vessel;the frame comprises a base surface facing side configured to face a base surface, on which the fuel container apparatus is to rest, when the fuel container apparatus is in an upright orientation;the base surface facing side is configured to contact the base surface in the upright orientation to support the fuel container apparatus.

2. The fuel container apparatus according to claim 1, wherein:the frame comprises tubing arranged to define the borders of the frame.

3. The fuel container apparatus according to claim 2, wherein:the tubing comprises steel.

4. The fuel container apparatus according to any one of the preceding claims, comprising:two or more support feet, wherein the support feet are configured to contact the base surface in the upright orientation to support the fuel container apparatus.

5. The fuel container apparatus according to claim 4, wherein:each of a plurality of the two or more support feet comprises an elongate portion having an elongate portion longitudinal axis configured to be parallel, or close to parallel, to the base surface when the fuel container apparatus is in the upright orientation.

6. The fuel container apparatus according to claim 5, wherein:each of two or more of the elongate portions comprise an elongate portion opening configured to receive a fork of a forklift in a direction parallel to the respective elongate portion longitudinal axis.

7. The fuel container apparatus according to claim 5 or claim 6, wherein:the elongate portions are fixed to the fuel pressure vessel.

8. The fuel container apparatus according to claim 7, whereineach of the two or more support feet comprises one or more support foot welded joints which fix the respective elongate portion to the fuel pressure vessel.

9. The fuel container apparatus according to claim 5 or claim 6, wherein: the elongate portions form part of the base surface facing side of the frame.

10. The fuel container apparatus according to any one of the preceding claims, wherein:the base surface facing side comprises a plurality of base surface contact portions configured to contact the base surface in the upright orientation to support the fuel container apparatus on the base surface; andthe base surface contact portions are arranged at or close to respective regions of the base surface facing side farthest away from a center of the fuel pressure vessel.

11. The fuel container apparatus according to any one of the preceding claims, wherein:the frame is fixed to the fuel pressure vessel at a plurality of frame welded joints.

12. The fuel container apparatus according to claim 11, wherein:each frame welded joint comprises a frame connector arm that is welded at a first end to the fuel pressure vessel, and is welded at a second end to the frame.

13. The fuel container apparatus according to claim 12, wherein:the first end of each frame connector arm is shaped to match the curvature of a respective location on the fuel pressure vessel, where said first end is to be welded.

14. The fuel container apparatus according to any one of claims 1 to 10, comprising: a plurality of connector elements configured to fix the fuel pressure vessel to theframe.

15. The fuel container apparatus according to any one of the preceding claims, wherein:the frame defines a plurality of backup support sides, the backup support sides configured to be perpendicular, or close to perpendicular, to the base surface when the fuel container apparatus is in the upright orientation; andthe backup support sides are configured to support the fuel container apparatus on the base surface when in an orientation 90 degrees different to the upright orientation.

16. The fuel container apparatus according to any one of the preceding claims, wherein:the frame comprises a plurality of connecting structures on an upward facing side, which upward facing side is a side of the frame opposite to the base surface facing side; andthe plurality of connecting structures is configured to connect to a lifting apparatus.

17. The fuel container apparatus according to any one of the preceding claims, wherein:the fuel pressure vessel comprises a set of valves suitable for use on a pressure vessel to be used for transporting a fluid under pressure.

18. The fuel container apparatus according to any one of the preceding claims, wherein:the frame is configured to provide a larger area of the base surface over which the fuel container apparatus is supported as compared to the fuel pressure vessel itself.

19. A method of transporting a fuel in fluid form under pressure, the method comprising:transporting the fuel within a fuel container apparatus for use with an electricity generator, the fuel container apparatus comprising:a fuel pressure vessel configured to contain a fuel in fluid form under pressure; anda frame arranged to surround the fuel pressure vessel,wherein:the frame is fixed to the fuel pressure vessel;the frame comprises a base surface facing side configured to face a base surface, on which the fuel container apparatus is to rest, when the fuel container apparatus is in an upright orientation;5 the base surface facing side is configured to contact the basesurface in the upright position to support the fuel container apparatus.

20. The method according to claim 19, wherein:the fuel pressure vessel comprises a set of valves suitable for use on a pressure10 vessel to be used for transporting a fluid under pressure, andthe method comprises:connecting the fuel pressure vessel to an electricity generator via one of the set of valves to supply the fuel to the electricity generator.15

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