FREIGHT CONTAINER WITH FIRE SUPPRESSION

Abstract

A freight container (1) has a frame to which a bottom (2), a roof (3), and sides (5-7) are attached, one side having a door opening closeable by a folding door (12) made of flexible, fire resistant material. The door (12) is supported from runners (13) moveable along a rail (14) combined with a top member (9) of a frame delimiting the door opening. A gap (15) is formed between the top frame member (9) and the top of the door (12) in its closed condition. The top member (9) is provided with a depending support (16) having a surface facing the inside of the door (12) and having attached thereto a strip of heat intumescent material (20). A flow passage (18) is formed between the strip (20) and the door (12) for gasses attempting to escape from the container through the gap (15) in a fire inside the container. The heat intumescent material (20) is arranged to swell and close the flow passage (18) when subjected to hot gasses from the fire inside the container.

Claims

1. A freight container having a frame to which a bottom, a roof, and sides are attached, at least one side having a door opening closeable by a folding door made of flexible fire resistant material, the door being supported from runners moveable along a rail combined with a top member of a frame delimiting the door opening, a gap being formed between the top frame member and the top of the door in its closed condition, wherein the top member is provided with a depending support having a surface facing the inside of the door and having attached thereto a strip of heat intumescent material, a flow passage being formed between the strip and the door for gasses attempting to escape from the container through the gap, the heat intumescent material being arranged to swell and close the flow passage when subjected to hot gasses from a fire inside the container.

2. A freight container according to claim 1, wherein the freight container is an air freight container.

3. A freight container according to claim 1, wherein the heat intumescent material has a swelling temperature in a range of about 130 C. to about 170 C.

4. A freight container according to claim 1, wherein the heat intumescent material has a swelling temperature in a range of about 140 C. to about 160 C.

5. A freight container according to claim 1, wherein the nominal swelling temperature of the heat intumescent material is about 150 C.

6. A freight container according to claim 1, wherein at least 50% is made from one of aluminum, aluminum alloy and a composite material, or any combination thereof.

7. A freight container according to claim 1, wherein the heat intumescent material is contained in a pocked of flame resistant fabric which is fastened to the depending support.

8. A method of suppression of fires inside an air freight container having a flexible folding door suspended from a top frame member of the container, wherein an elongate strip of metal provided with a heat intumescent material is attached to the top frame member with the heat intumescent material facing the door.

9. An element for installation on a freight container having a flexible folding door suspended from a top frame member of the container for aiding in suppression of fires inside the container, wherein the element comprises an elongate strip of metal provided on one side with a pocket containing a heat intumescent material, the element being intended for attachment to the top frame member.

10. An element according to claim 9, wherein the intumescent material has a swelling temperature in a range of about 130 C. to about 170 C.

Description

DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0009] An exemplifying embodiment of the invention is illustrated in the appended schematic drawings, in which:

[0010] FIG. 1 is a perspective view of an air freight container;

[0011] FIG. 2 is a front view of the container in FIG. 1;

[0012] FIG. 3 is a sectional view of a plane through the line A-A in FIG. 2 in a normal operating condition of the container; and

[0013] FIG. 4 is a sectional view like FIG. 3 in a fire condition of the container.

DETAILED DESCRIPTION OF THE INVENTION

[0014] The exemplifying container 1 illustrated in FIGS. 1-4 is an air freight container classified according to the International Air Transport Association (IATA) rules as an AMJ air cargo container. As shown in FIG. 1, the container has a generally prismatic form and comprises a bottom panel 2, two roof panels 3, 4, opposing side panels 5, 6, and a rear side panel 7. As best seen from FIG. 2, these panels are attached to a framework, of which a front opening of the container is delimited by a bottom frame member 8, a top or roof frame member 9, and two opposed vertical frame members 10, 11 connecting the bottom and top frame members.

[0015] The front opening is closed by a folding door 12 comprising a fire resistant, flexible fabric, as will be well known to the skilled person and should need no further identification here. Normally, a reinforcing net is arranged in front of the door, the net being omitted here for clarity. As best shown in FIGS. 3 and 4, the door 12 is supported from hangers 13 movable in a rail 14 integrated in the top frame member 9.

[0016] A gap 15 is present between the top of the door 12 and the frame member 9 above it.

[0017] On the inside of the top frame member 9, a plate-like element 16 is depending to a level somewhat below attachments 17 between the door 12 and hangers 13. Thus, a passage 18 is formed between the door and element 16, through which all gasses leaving the container through the gap 15 have to flow. The element 16 may be attached to the frame member 9 by any suitable means, such as welding, bolts or rivets, or it may be extruded as an integral part of the frame member 9.

[0018] On the side of the depending element 16 facing the door 12, the element 16 is provided with a pocket 19 of a flame retardant vinyl coated glass fiber fabric. This pocket contains a strip of heat intumescent material 20, such as Intumex L, with dimensions 502.5 millimeter. The intumescent material 20 should have swelling temperature in the range of about 130 C. to about 170 C., preferably about 140 C. to 160 C. The pocket 19 may be sewn from a strip of material or have the edges joined by cramps or the like. The pocket may even be tube knitted. The pocket is attached to the element 16 by rivets, screws or high temperature adhesive.

[0019] FIG. 3 shows the intumescent material 20 in the normal operatingor standbycondition. Should the temperature rise inside the container, e.g. caused by a smoldering fire somewhere in the cargo, hot gasses will pass through the passage 18 and out through the gap 15. This causes heating of the intumescent material 20 and causing it to swell and close the passage 18 and thereby also the container.

[0020] The container will for the most part be made of aluminum or aluminum alloy. A composite material, e.g. involving aramid fibers and resin, is also contemplated.

[0021] It will be understood that the plate-like element 16 with the pocket 19 and intumescent material 20 can be made as a separate elongate part for subsequent attachment to the top frame member 9. This means that existing containers can have their fire suppression properties improved in a simple and cost-efficient manner.

[0022] A freight container having a frame to which a bottom, a roof, and sides are attached, at least one side having a door opening closeable by a folding door made of flexible fire resistant material, the door being supported from runners moveable along a rail combined with a top member of a frame delimiting the door opening, a gap being formed between the top frame member and the top of the door in its closed condition, wherein the top member is provided with a depending support having a surface facing the inside of the door and having attached thereto a strip of heat intumescent material, a flow passage being formed between the strip and the door for gasses attempting to escape from the container through the gap, the heat intumescent material being arranged to swell and close the flow passage when subjected to hot gasses from a fire inside the container.

[0023] In an embodiment, the freight container is an air freight container.

[0024] In an embodiment, the heat intumescent material has a swelling temperature in a range of about 130 C. to about 170 C.

[0025] In an embodiment, the heat intumescent material has a swelling temperature in a range of about 140 C. to about 160 C.

[0026] In an embodiment, the nominal swelling temperature of the heat intumescent material is about 150 C.

[0027] In an embodiment, at least 50% is made from one of aluminum, aluminum alloy and a composite material, or any combination thereof.

[0028] In an embodiment, the heat intumescent material is contained in a pocked of flame resistant fabric which is fastened to the depending support.

[0029] A method of suppression of fires inside an air freight container having a flexible folding door suspended from a top frame member of the container, wherein an elongate strip of metal provided with a heat intumescent material is attached to the top frame member with the heat intumescent material facing the door.

[0030] An element for installation on a freight container having a flexible folding door suspended from a top frame member of the container for aiding in suppression of fires inside the container, wherein the element comprises an elongate strip of metal provided on one side with a pocket containing a heat intumescent material, the element being intended for attachment to the top frame member.

[0031] In an embodiment, the intumescent material has a swelling temperature in a range of about 130 C. to about 170 C.

[0032] It will also be understood that the invention is not limited to the exemplifying embodiment described above, but may be varied and modified by the skilled person within the scope of the appended claims.