EP2173439A2

EP2173439A2 - Methods and apparatus for containing hazardous material

Info

Publication number: EP2173439A2
Application number: EP08826403A
Authority: EP
Inventors: William A. Eckholm; Dustin C. Moran; Brian J. Cashion
Original assignee: Firetrace USA LLC
Current assignee: Firetrace USA LLC
Priority date: 2007-07-13
Filing date: 2008-07-11
Publication date: 2010-04-14
Also published as: EP2173439A4; AU2008276186A1; ZA201000139B; CA2693407A1; WO2009012160A3; US20090018382A1; WO2009012160A2; AU2008276186B2; JP2014051279A; JP2010534164A; IL203101A; KR20100057604A

Abstract

Methods and apparatus for containing a hazardous material according to various aspects of the present invention operate in conjunction with a container having two compartments. The first compartment is configured to contain the hazardous material, and the second compartment contains a hazard control material. The container may further comprise a wall separating the first compartment from the second compartment. The wall is configured to open upon occurrence of a trigger event.

Description

IN THE UNITED STA TES PA TENTAND TRADEMARK OFFICE AS RECEIVING OFFICE FOR THE PA TENT COOPERA TION TREA TY (PCT)

Title: METHODS AND APPARATUS FOR CONTAINING HAZARDOUS

MATERIAL

Inventors): William A. Eckholm (Phoenix, Arizona); Dustin C. Moran (Peoria, Arizona); Brian J. Cashion (Gilbert, Arizona)

CROSS-REFERENCES TO RELATED APPLICATIONS

[0001] This application claims the benefit of U.S. Provisional Patent Application No.

60/949,599, filed July 13, 2007, and incorporates the disclosure of the application by reference.

BACKGROUND OF THE INVENTION

[0002] Flammable and otherwise hazardous materials play an important role in the everyday lives of most people. Most people encounter flammable materials, such as gasoline, engine oil, diesel fuel, and natural gas, without danger. Because the flammable materials are contained, they typically present no problem for those that are nearby.

[0003] Occasionally, the vessels used to contain hazardous material rupture and the hazardous material escapes. For instance, the fuel tank in a military vehicle may rupture when struck by a projectile, causing the fuel or associated vapor to leak out. The uncontained fuel and vapor may pose a host of dangers including combustion of the fuel, toxic fumes, adverse chemical reaction with other substances outside the [0004] A variety of systems have been developed to ameliorate the problems associated with uncontained hazardous material. These systems generally include a container of hazard control material such as fire extinguishant positioned in the vicinity of the hazardous materia! container. The hazard control material is then applied manually or automatically to reduce the danger of the hazardous material. These hazard control systems are generally stand-alone units and/or after-market systems applied to preexisting hazardous material containers.

SUMMARY OF THE INVENTION

[0005] Methods and apparatus for containing a hazardous material according to various aspects of the present invention operate in conjunction with a container having two compartments. The first compartment is configured to contain the hazardous material, and the second compartment contains a hazard control material. The container may further comprise a wall separating the first compartment from the second compartment. The wall is configured to open upon occurrence of a trigger event.

BRIEF DESCRIPTION OF THE DRAWING FIGURES

[0006] A more complete understanding of the present invention may be derived by referring to the detailed description and claims when considered in connection with the following illustrative figures. In the following figures, like reference numbers refer to similar elements and steps throughout the figures. [0007] Figures IA-B are cutaway top and side views of a container according to various aspects of the present invention. [0008] Figure 2 is a cutaway orthographic view of an embodiment wherein the second compartment at least partially encloses a first compartment and wherein the second compartment includes at least one channel. [0009] Figure 3 is a cutaway orthographic view of an embodiment of the present invention wherein a second compartment and a third compartment at least partially enclose a first compartment. [0010] Figure 4 is a cutaway orthographic view of an embodiment wherein a second compartment and a third compartment at least partially enclose a first compartment and wherein the second compartment and the third compartment each include at least one channel. [001 1] Figure 5 is cross-sectional view of a container including multiple additional compartments adjacent the first compartment. [0012] Figure 6A-C illustrate the operation of the container in response to an incident projectile. [0013] Elements and steps in the figures are illustrated for simplicity and clarity and have not necessarily been rendered according to any particular sequence. For example, steps that may be performed concurrently or in different order are illustrated in the figures to help to improve understanding of embodiments of the present invention. DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS

[0014] The present invention may be described in terms of functional block components and various processing steps. Such functional blocks may be realized by any number of components configured to perform the specified functions and achieve the various results. For example, the present invention may employ various hazardous materials, hazard control materials, container materials, pressurizations, dimensions, and geometries, which may carry out a variety of operations suited to a specified hazard condition, application, or environment. In addition, the present invention may be practiced in conjunction with any number of systems configured for operation with the hazardous material and/or hazard control material, and the system described is merely one exemplary application for the invention. Further, the present invention may employ any number of conventional techniques for hazard control, hazard prevention, risk reduction, and the like.

[0015] Referring to Figures 1 A-B, methods and apparatus for containing a hazardous material according to various aspects of the present invention operate in conjunction with a container 100 to reduce the danger of a contained hazardous material 105. For example, referring to Figure 1. the container 100 may contain the hazardous material 105 within a first compartment 115 and a hazard control material 107 within a second compartment 125. The container 100 may be configured to release the hazard control material 107 in response to a hazard condition such that the hazardous material 105 is less hazardous or rendered substantially harmless.

[0016] The container 100 may be configured in any manner to release the hazard control material 107 in response to the relevant hazard condition. For example, the container 100 may comprise a first surface 1 10 defining at least a portion of the first compartment 115, a second surface 120 defining at least a portion of the second compartment 125, and a wall 150 configured to lose integrity in response to a trigger event corresponding to the hazard condition. The second compartment 125 may at least partially enclose the first compartment 1 15. The container 100 may be implemented in a variety of environments, including stand-alone storage systems or fuel tanks for motor vehicles.

[0017] In one embodiment, the container comprises a fuel tank or can, such that the first compartment 115 stores fuel and its associated vapors, and the second compartment contains a fire extinguishant. The container 100 may release the extinguishant to mix with vapors or fuel in the first compartment 115 to interfere with the combustion of the vapors. If the container 100 experiences a hazard condition, such as penetration by a projectile, the wall 150 at least partially opens or otherwise releases the extinguishant to reduce the flammability of the fuel. In this way. the probability of creating a fireball in the fuel tank is reduced and the risks associated with operation of the vehicle are decreased.

[0018] The first compartment 115 may contain the hazardous material 105, which may comprise any material that may need to be neutralized or otherwise rendered less dangerous. For example, the hazardous material 105 may comprise fuel for a combustion engine, battery chemicals, solvents, brake fluid, transmission fluid, jet fuel, waste products such as radioactive and/or biological waste, and/or the like. In addition, the hazardous material 105 may be in any form, such as a liquid, vapor, solid, powder, granular, and/or other form. The hazardous material may exhibit properties to be controlled, such as inflammability, chemical reactivity, toxicity, radioactivity, acidity, contagiousness, and/or the like.

[0019] The first compartment 115 may be adapted to contain the hazardous material

105. In one embodiment for a vehicle fuel tank, the first compartment 115 may be configured to provide adequate volume to accommodate the fuel needs of the vehicle. Furthermore, the first compartment 115 may be shaped to fit into the fuel compartment area of the vehicle. In addition, the first compartment 115 may comprise any appropriate materials to accommodate the hazardous material 105. For example, the surfaces defining the first compartment 115 may comprise or be lined with materials that do not react to the hazardous material 105, provide a shield around the hazardous material 105, or provide thermal and/or electrical insulation.

[0020] The first compartment 1 15 may also be adapted to the application and/or environment. In ^'various embodiments, the first compartment may include baffles or one or more subcompartments, which may be interconnected or isolated from each other. Further, the first compartment 115 may include an inlet 108 and an outlet 109, for example to permit fuel to be added to and removed from the fuel tank. The first compartment 115 may be otherwise adapted according to the application and environment of the container 100. .

[0021] The second compartment 125 contains the hazard control material 107. The second compartment 125 may be configured in any manner to contain the hazard control material 107. for example according to the environment, application, hazard control material 107, hazardous material 105, and/or other relevant factors. For example, the second compartment 125 may provide adequate volume to accommodate sufficient hazard control material 107 according to the anticipated hazard. Furthermore, the second compartment 125 may be shaped to fit into the fuel compartment area of the vehicle and to engage the outer contours of the first compartment 1 15. In addition, the second compartment 125 may comprise any appropriate materials to accommodate the hazard control material 107. For example, the second surface 120 at least partially defining the second compartment 125 may comprise or be lined with materials that do not react to the hazard control material 107, provide a shield around the hazard control material 107, or provide thermal and/or electrical insulation. The second surface 120 may further be configured to . open upon impact or other force from an external body, such as a bullet or shrapnel, or an internal body, such as a clapper, explosive, or other actuator. The opening or other decomposition of the second surface 120 facilitates release of the hazard control material 107 into the surrounding environment.

[0022] In the present embodiment, the second compartment 125 is positioned adjacent the first compartment 115 and separated from the first compartment 115 by one or more surfaces, such as the wall 150. The second compartment 125 may comprise one or more separate subcompartments, or interconnected semi-separate subcompartments. In addition, the second compartment 125 may include at least one horizontal or vertical partition 11 1 or other mechanism for maintaining the distribution of the hazard control material 107 around the second compartment 125 and/or providing structural support. The second compartment may include other elements, such as at least one inlet, at least one outlet, at least one point of constriction, and/or the like. [0023] The second compartment 125 may comprise various structures and/or mechanisms configured to deploy the hazard control material 107 in response to the relevant hazard condition. For example, the partitions 11 1 maintain the distribution of the hazard control material 107 within the second compartment 125. In addition, referring to Figure 2, the second compartment 125 may comprise interconnections 270 between subcompartments, for example to facilitate transfer of the hazard control material 107 between the subcompartments, such as to initially fill the second compartment with the hazard control material 107. The second compartment 125 may also include an actuator, such as electronic, pneumatic, and/or hydraulic systems, to flow of the hazard control material 107 between the subcompartments and/or deploy the hazard control material 107 in response to the relevant hazard condition. The second compartment 120 may also be pressurized to enhance dispersal of the hazard control material 107.

[0024] The hazard control material 107 comprises a material for neutralizing or otherwise reducing the hazard presented by the hazardous material 105 in the event of the hazard condition. The hazard control material 107 may comprise any appropriate material to control or reduce the effects of the hazardous material 105, such as a fire extinguishant, an acid neutralizer, or other hazard control material 107 selected according to the hazardous material 105. For example, the hazard control material 107 may comprise a fire extinguishant if the hazardous material 105 is flammable. In the present embodiment, the hazard control material 105 comprises the Black Widow^{1 M} fire extinguishant available from Firetrace Aerospace, LLC. As another example, if the hazardous material is chemically reactive, the hazard control material 107 may reduce or dilute the chemical reactivity of the hazardous material 105. As yet another example, if the hazardous material is radioactive, the hazard control material may inhibit transmission of radiation. Alternatively, if the hazardous material 105 present a biological hazard or a toxic material, the hazard control material 107 may neutralize, reduce the threat of, create a visual marker of, or counter the biological hazard or toxicity. The properties of the hazard control material 107 may be selected according to the hazardous material 105.

[0025] The hazard control material 107 may comprise a substantially solid material such as granular material or a powder, as well as a substantially fluid material such as liquids, gases, and vapors. The hazard control material 107 may comprise a material in various phases simultaneously. In addition, the hazard control material 107 may- include multiple materials to counter multiple hazardous materials 105.

[0026] The container 100 may release the hazard control material 107 in response to a particular hazard condition. The hazard condition may be represented by any appropriate trigger event, such as a change in the status of the contained hazard control material 105. For example, the trigger event may include a change in temperature or pressure of the hazardous material 105 or the first compartment 115, impact by another object, sudden acceleration or deceleration, or release, leakage, or contamination of the hazardous material 105. The container 100 may detect and/or respond to the hazard condition in any appropriate manner. For example, the container 100 may include a hazard detector, such as a pressure sensor, temperature sensor, radiation sensor, chemical sensor, or the like and an actuator configured to deploy the hazard control material 107 from the second compartment in response to the hazard detector. For example, the actuator may compromise the integrity of the second compartment 125 or the wall 150, open a valve on the second compartment 125, or otherwise release the hazard control material 107 from the second compartment 125.

[0027] In the present embodiment, the container 100 releases the hazard control material 107 in response to a mechanical disruption of the container 100 such that the second compartment 125 releases the hazard control material 107 when the disruption is likely to cause a release of the hazardous material 105 or otherwise cause a dangerous condition. For example, one or more surfaces defining the second compartment 125 may be configured to rip, tear, be punctured, crack, decompose, dissolve, or otherwise lose integrity to facilitate release of the hazard control material 107.

[0028] In the present embodiment, the container 100 includes at least one wall 150 separating the first compartment 115 from the second compartment 125. The wall 150 may comprise any partition between the first compartment 115 and the second compartment 125 that loses its integrity in response to the hazard condition. In the present embodiment, the wall 150 is configured to open upon impact or other force from an external body, such as a bullet or shrapnel, or an internal body_., such as a clapper, explosive, or other actuator. The opening or other decomposition of the wall 150 facilitates release of the hazard control material 107, for example into the area of the hazardous material 105. The wall 150 may open locally and create a relatively small hole in the wall 150, or may open more substantially, such as substantially completely, to release a maximum amount of hazard control material 107. [0029] The wall 150 may be disposed in any position relative to the first compartment 1 15 and the second compartment 125 to facilitate deployment of the hazard control material 107. in the present embodiment, the wall 150 is disposed concentrically within the second surface 120, thus defining the second compartment 125 as the space between the wall 150 and the second surface 120, and the first compartment 1 15 as the space within the wall 150. The wall 150 may be contiguous so that the first compartment 1 15 is fully defined by the wall 150 and the first compartment 115 is completely enclosed within the second compartment 125. Thus, any exterior object penetrating the first compartment 1 15 must first penetrate the second compartment 125 and the wall 150, causing the wall 150 to open and deploy the hazard control material 115.

[0030] Alternatively, the wall 150 may only partially define the first compartment

1 15, and one or more other surfaces, such as the first surface 110, may define the remaining portion of the first compartment 1 15. The wall 150 may define an unenclosed region 160 that is not enclosed by the wall 150. The unenclosed region 160 may be situated in a portion of the container 100 that is unlikely to be susceptible to hazard conditions. For example, if the container 100 is stacked with other systems, it may be acceptable to leave portions of the first compartment 1 15 unenclosed by the second compartment 125. The first surface 1 10 and the wall 150 may be configured to define multiple unenclosed regions 160. For example, referring to Figure 2, the unenclosed region 160 may comprise an indentation of the second compartment 125 configured to fit the container 100 within certain other systems, such as within a vehicle. As yet another example, referring to Figure 3, the unenclosed region 160 may be a continuous portion of the exterior of the container 100 and extend to more than one surface of the wall 150.

[0031] The wall 150 may deploy the hazard control material 107 in any appropriate manner. In the present embodiment, the wall 150 may be configured to open in response to the hazard condition, such as in response to an impact. For example, the wall 150 may comprise a breakable material, such as glass, ceramic, acrylic, plastic, metal, or other sufficiently non-impervious material. The wall 150 may be configured to open such that substantially all of die contents of the second compartment 125 are released in response to the hazard condition. For example, the wall 150 may comprise stress points, such as thinner sections of the wall 150 in the form of grooves or hatching, to facilitate opening for full deployment and/or directional deployment of the hazard control material 107. Likewise, the material of the wall 150 may exhibit a grain such that the wall 150 tends to open or separate across or along the grain.

[0032] The wall 150 may release the hazardous control material 107 in any suitable manner. In the present embodiment, the wall 150 is compromised upon impact by an object, such as a bullet, shrapnel, or missile. The wall 150 may be configured to release the hazardous control material 107, however, in response to any appropriate trigger event signifying a hazard condition, such as a specified stress, pressure, or temperature in or upon the wall 150, or incidence of a particular material, such as a particular material corresponding to the hazard condition, with a portion of the wall 150. Further, the container 100 may include additional systems to facilitate breaching the wall 150. For example, the container 100 may include a control system to control the integrity of the wall 150. The control system may include any appropriate components, such as one or more sensors to detect the hazard condition, and one or more actuators, such as hydraulic actuators, pneumatic actuators, and/or solenoid valves, to compromise the integrity of or otherwise breach the wall 150 or otherwise deploy the hazard control material 107 in response to a signal from the sensor.

[0033] In another embodiment, the container 100 may further comprise a membrane positioned between the first compartment 115 and the second compartment 125. Alternatively, the membrane may be disposed solely along an outer surface of the second compartment 125. The membrane seals small holes or punctures that might result in a small leak of the hazardous material 105 not resulting in an immediately hazardous situation. The membrane may comprise any suitable self-sealing system such as a single-piece system configured to fit between the first compartment 1 15 and the second compartment 125 or a coating applied to the first compartment 1 15 and/or the second compartment 125. The membrane may comprise any suitable material such as gel, polyurethane, rubberized asphalt, elastomeric coatings, foam and the like. For example, the membrane may comprise a self-sealing coating suitably configured to seal holes caused by small arms fire that is applied to the first compartment 115 before the second compartment 125 is position around the first compartment 1 15.

[0034] The container 100 may include multiple first and second compartments 1 15,

125. For example, referring to Figures 2-4, the container 100 may include one or more additional compartments 135. The compartments may be isolated (Figure 3) or interconnected by one or more interconnections 270 (Figures 2 and 4). The wall 150 may separate the additional compartments 135 from the first compartment 115. The second compartment 125 and the additional compartments 135 may fully enclose the first compartment 1 15, or partially enclose the first compartment 115 to form the unenclosed region 160. The additional compartments 135 may include any relevant additional features, such as inlets, outlets, subcompartments, channels, valves, points of constriction, or the like.

[0035] The additional compartments 135 may contain any appropriate material. In the present embodiment, the additional compartments 135 contain the hazard control material 107. Alternatively, the additional compartments 135 may contain different hazard control materials to address different hazards. In addition, the additional compartments 135 may be configured to contain more or less hazard control material 107, deploy the hazard control material 107 in a selected direction or manner, or react to a selected hazard condition, for example according to anticipated angles of attack. Further, the additional compartments 135 may deploy the hazard control material 107 in response to different hazard conditions, for example by changing the thickness or materials of the wall 150 associated with the different compartments 135.

[0036] The compartments 1 15, 125, 135 may be arranged in any configuration, for example to deploy multiple hazard control materials 107 or to deploy the hazard control material 107 in response to hazard conditions arriving from different incident angles. For example, referring to Figure 5, the additional compartment 135 may be sandwiched between the first compartment 115 and the second compartment 125, such that both compartments 125, 135 are disposed between the first compartment 1 15 and the external environment. Alternatively, the additional compartment 135 may at least partially enclose the second compartment 125.

[0037] Referring to Figure 6A-B, in operation, the container 100 is initially formed and the second compartment 125 is filled with the hazard control material 107. The container 100 may be installed in the appropriate environment or application, such as in a vehicle or as a stand-alone storage facility and used for its ordinary applications. In the present embodiment, the container 100 is installed as a fuel tank in a vehicle. The fuel may comprise a flammable fuel, such as conventional gasoline or jet fuel.

[0038] The container 100 responds to the trigger event corresponding to the hazard condition. The container 100 may detect and respond to the hazard event in any manner. In the present embodiment, a projectile 122 pierces the second surface 120 and passes through hazard control material 107 (Figure 6B). The projectile 122 then strikes the wall 150, causing the wall 150 to fail, such as by puncturing. In the present embodiment, a large portion of the wall 150 breaks open, releasing the hazard control material 107 from multiple subcompartments of the second compartment 125 (Figure 6C) both into the first compartment 115 and into the surrounding environment. The failure of the wall 150 reduces or eliminates the separation of the hazard control material 107 from the hazardous material 105.

[0039] As the projectile 122 proceeds into the first compartment 1 15, the projectile

122 may tend to release and/or ignite the hazardous material 105 or otherwise generate the hazard condition. The failure of the wall 150, however, releases the hazard control material 107, which may follow the projectile 122 into the first compartment and mix with the hazardous material 105. In addition, if the hazardous material 105 leaves the first compartment, the hazard control material 107 may accompany the hazardous material 105. Thus, the hazard control material 107 tends to mitigate the hazard presented by the hazardous material 105 following the trigger event

[0040] The particular implementations shown and described are illustrative of the invention and its best mode and are not intended to otherwise limit the scope of the present invention in any way. Indeed, for the sake of brevity, conventional manufacturing, connection, preparation, and other functional aspects of the system may not be described in detail. Furthermore, the connecting lines that may be shown in the various figures are intended to represent exemplary functional relationships and/or physical couplings between the various elements. Many alternative or additional functional relationships or physical connections may be present in a practical system. Benefits, other advantages and solutions to problems that have been described above with regard to particular embodiments are not to be construed as critical, required or essential features or components. Changes and modifications may be made to the exemplary embodiments without departing from the scope of the present invention. These and other changes or modifications are intended to be included within the scope of the present invention, as expressed in the following claims.

[0041] In the foregoing description, the invention has been described with reference to specific exemplary embodiments; however, various modifications and changes may be made without departing from the scope of the present invention. The description and figures are to be regarded in an illustrative manner rather than a restrictive one, and all such modifications are intended to be included within the scope of the present invention. Accordingly, the scope of the invention should be determined by the generic embodiments described and their legal equivalents rather than by merely the specific examples described above. For example, the steps recited in any method or process embodiment may be executed in any order and are not limited to the explicit order presented in the specific examples. Additionally, the components and/or elements recited in any apparatus embodiment may be assembled or otherwise operationally configured in a variety of permutations to produce substantially the same result as the present invention and are accordingly not limited to the specific configuration recited in the specific examples. The terms "comprises", "comprising", or any variation thereof, are intended to reference a non-exclusive inclusion, such that a process, method, article, composition or apparatus that comprises a list of elements does not include only those elements recited, but may also include other elements not expressly listed or inherent to such process, method, article, composition or apparatus. Other combinations and/or modifications of the above-described structures, arrangements, applications, proportions, elements, materials or components used in the practice of the present invention, in addition to those not specifically recited, may be varied or otherwise particularly adapted to specific environments, manufacturing specifications, design parameters or other operating requirements without departing from the general principles of the same.

Claims

CLAIMS We claim:

1. A container, comprising: a first surface defining a first compartment, wherein the first compartment contains a hazardous material; and a second surface defining a second compartment adjacent the first compartment, wherein the second compartment is configured to contain a hazard control material and at least partially open in response to an impact.

2. A container according to claim 1 , further comprising a wall separating the first compartment from the second compartment, wherein the integrity of the wall is configured to at least partially open in response to an impact.

3. A container according to claim 1 , wherein the second compartment at least partially encloses the first compartment.

4. A container according to claim 1, further comprising a partition within the second compartment and defining at least two subcompartments within the second compartment.

5. A container according to claim 4, further comprising an interconnection between the at least two subcompartments.

6. A container according to claim 1, wherein the hazard control material comprises a fire extinguishant,

7. A container according to claim 1 , wherein the first compartment and the second compartment are configured to be installed in a vehicle as a fuel tank.

8. A container according to claim 2, wherein the wall includes a surface defining a thinner section of the wall than a surrounding area of the wall.

9. A container according to claim 1 , further comprising a membrane disposed along at least one of the first surface and the second surface.

10. A fuel tank system for a vehicle, comprising: a first surface defining a first compartment configured to contain fuel for the vehicle; and a second surface defining a second compartment adjacent the first compartment and configured to contain a fire extinguishant and at least partially open in response to an impact.

1 1. A fuel tank system according to claim 10, further comprising a wall separating the first compartment from the second compartment, wherein the integrity of the wall is configured to at least partially open in response to an impact.

12. A fuel tank system according to claim 10, wherein the second compartment at least partially encloses the first compartment.

13. A fuel tank system according to claim 10, further comprising a partition within the second compartment and defining at least two subcompartments within the second compartment.

14. A fuel tank system according to claim 13, further comprising an interconnection between the at least two subcompartments.

15. A fuel tank system according to claim 1 1, wherein the wall includes multiple grooves defined in a surface of the wall.

16. A fuel tank system according to claim 10, further comprising a membrane disposed along at least one of the first surface and the second surface.

17. A method of controlling a hazardous material, comprising: providing a first surface defining a first compartment, wherein the first compartment is configured to contain the hazardous material; and placing a second surface defining a second compartment adjacent the first compartment and configured to contain a hazard control material and at least partially open in response to an impact.

18. A method according to claim 17, further comprising a wall separating the first compartment from the second compartment, wherein the integrity of the wall is configured to at least partially open in response to an impact.

19. A method according to claim 18, wherein the wall includes a surface defining a thinner section of the wall than a surrounding area of the wall.

20. A method according to claim 17, further comprising placing a membrane along at least one of the first surface and the second surface.

21. A method according to claim 17, further comprising inserting the hazard control material into the second compartment. .

22. A method according to claim 17, wherein the second compartment at least partially encloses the first compartment

23. A method according to claim 17, further comprising providing a partition within the second compartment, wherein the partition defines at least two subcompartments within the second compartment.

24. A method according to claim 17, further comprising an interconnection between the at least two subcompartments.

25. A method according to claim 17, wherein the hazard control material comprises a fire extinguishant.

26. A method according to claim 17, wherein the first compartment and the second compartment are configured to be installed in a vehicle as a fuel tank.