EP1170569A2 - Device aiming at keeping under control the behaviour of a metallic container containing self-igniting material, in case of external fire - Google Patents
Device aiming at keeping under control the behaviour of a metallic container containing self-igniting material, in case of external fire Download PDFInfo
- Publication number
- EP1170569A2 EP1170569A2 EP01401694A EP01401694A EP1170569A2 EP 1170569 A2 EP1170569 A2 EP 1170569A2 EP 01401694 A EP01401694 A EP 01401694A EP 01401694 A EP01401694 A EP 01401694A EP 1170569 A2 EP1170569 A2 EP 1170569A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- enclosure
- behaviour
- case
- external fire
- under control
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 239000000463 material Substances 0.000 title claims abstract description 13
- 230000008018 melting Effects 0.000 claims abstract description 3
- 238000002844 melting Methods 0.000 claims abstract description 3
- 239000002184 metal Substances 0.000 claims description 4
- 230000003313 weakening effect Effects 0.000 claims description 4
- 239000012212 insulator Substances 0.000 claims description 2
- 230000009172 bursting Effects 0.000 claims 1
- 239000003566 sealing material Substances 0.000 claims 1
- 239000003380 propellant Substances 0.000 abstract description 11
- 229910000831 Steel Inorganic materials 0.000 abstract description 2
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004449 solid propellant Substances 0.000 abstract description 2
- 239000010959 steel Substances 0.000 abstract description 2
- 238000009413 insulation Methods 0.000 abstract 1
- 239000012634 fragment Substances 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 238000004880 explosion Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 206010061218 Inflammation Diseases 0.000 description 1
- 239000005062 Polybutadiene Substances 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004054 inflammatory process Effects 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002857 polybutadiene Polymers 0.000 description 1
- 229920002635 polyurethane Polymers 0.000 description 1
- 239000004814 polyurethane Substances 0.000 description 1
- 230000002269 spontaneous effect Effects 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F42—AMMUNITION; BLASTING
- F42B—EXPLOSIVE CHARGES, e.g. FOR BLASTING, FIREWORKS, AMMUNITION
- F42B39/00—Packaging or storage of ammunition or explosive charges; Safety features thereof; Cartridge belts or bags
- F42B39/20—Packages or ammunition having valves for pressure-equalising; Packages or ammunition having plugs for pressure release, e.g. meltable ; Blow-out panels; Venting arrangements
Definitions
- the present invention relates to a device controlling the behavior of a metal enclosure containing materials spontaneously flammable in the event of an outdoor fire.
- the subject of the present invention is a device making it possible to control the behavior of a metal enclosure containing materials spontaneously flammable, in case of outdoor fire, without risk of violent projection of large fragments of the enclosure, this device being simple to adapt to different kinds of speakers, while being inexpensive, and effective in almost all cases.
- the device according to the invention comprises, in the wall of the enclosure, at least one weakening zone which does not affect the qualities mechanical enclosure under normal operating conditions.
- the present invention is described below with reference to a missile booster subjected to fire in its storage hangar accidental, but it is understood that it is not limited to this alone application, and that it can be implemented in other applications comprising a metal enclosure, already under internal pressure, or containing products which can put it under normal pressure, and overpressure in the event of an accident, this overpressure causing the explosion of the enclosure with violent projection of significant fragments of this enclosure.
- the propellant 1 shown in the single figure of the drawing essentially comprises a cylindrical metallic enclosure 2, generally made of steel inside which a charge of solid propellant 3 inside which a coaxial central channel is formed 4, intended to allow the radial combustion of the propellant 3 over the entire length of channel 4.
- a bonding agent says: "liner”
- liner is generally made of polybutadiene or polyurethane.
- each embrittlement zone which, in normal times (in absence of surrounding fire), do not degrade the mechanical qualities of the enclosure, that is to say that the behavior of the propellant in normal operation (propelling a missile, for example) is not not changed.
- these areas of each embrittlement comprises a hole 6 of small diameter (for example 3). for an enclosure with a diameter of approximately 160 mm, the number of these holes is about 5 and they are evenly distributed over the entire surface enclosure device.
- Each of these holes can be, like shown in the drawing, a through hole, closed by a plug 7 forced into the hole and can be ejected when the pressure interior exceeds a determined threshold.
- This plug can be made of material fuse at a temperature significantly lower than the melting temperature of the enclosure material 2.
- This fusible material may for example be of tin.
- the holes 6 are blind holes (counterbores) made from outside the enclosure, or many rectilinear, polygonal or circular notches made on the outer peripheral face of the enclosure, and whose depth is less than the thickness of the enclosure.
- the enclosure of the invention When the enclosure of the invention is subjected to a fire outside, the heating of its wall 2 causes the spontaneous inflammation of the propellant 3.
- the gases generated by this ignition cause the pressure inside the enclosure.
- the shutters 7 of the orifices 6 are ejected (or melt under the effect heat if they are made of fusible material at such a temperature). In the blind or notched holes, these drop out well before the internal pressure does not reach a value that can cause the explosion of the enclosure.
- the exhaust of hot combustion gases through the orifices thus cleared heats the edges of these orifices, which enlarges them and allows faster evacuation of gases.
- the enclosure can be covered with an insulator thermal (paint or layer of insulating material) in order to adapt the behavior of embrittlement zones at changes in temperature the enclosure, by delaying this rise in temperature.
- an insulator thermal paint or layer of insulating material
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
- Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
- Radar Systems Or Details Thereof (AREA)
Abstract
Description
La présente invention se rapporte à un dispositif maítrisant le comportement d'une enceinte métallique, contenant des matières spontanément inflammables, en cas d'incendie extérieur.The present invention relates to a device controlling the behavior of a metal enclosure containing materials spontaneously flammable in the event of an outdoor fire.
Certains propulseurs de missile, possédant une structure métallique, réagissent violemment quand ils sont soumis à l'épreuve du feu, dû à un incendie environnant. Dans ce cas, un grand nombre d'éclats de la structure métallique, de taille significative, sont violemment projetés à longue distance. Cette réaction est la conjonction de deux phénomènes :
- quelle que soit l'architecture du propulseur, l'échauffement dû à l'incendie provoque la réaction pyrotechnique du propulseur. l'énergie ainsi dégagée provoque une montée en pression dans l'enveloppe du propulseur ;
- simultanément, les propriétés de résistance mécanique de l'enveloppe ne sont pas suffisamment affaiblies par l'incendie. La rupture de l'enveloppe se produit donc à une pression élevée, génératrice d'éclats métalliques importants.
- whatever the architecture of the propellant, the heating due to the fire causes the pyrotechnic reaction of the propellant. the energy thus released causes a rise in pressure in the casing of the propellant;
- at the same time, the mechanical resistance properties of the envelope are not sufficiently weakened by the fire. The rupture of the envelope therefore occurs at high pressure, generating significant metallic fragments.
La présente invention a pour objet un dispositif permettant de maítriser le comportement d'une enceinte métallique, contenant des matières spontanément inflammables, en cas d'incendie extérieur, sans risque de projection violente de gros éclats de l'enceinte, ce dispositif étant simple à adapter à différentes sortes d'enceintes, tout en étant peu onéreux, et efficace dans pratiquement tous les cas.The subject of the present invention is a device making it possible to control the behavior of a metal enclosure containing materials spontaneously flammable, in case of outdoor fire, without risk of violent projection of large fragments of the enclosure, this device being simple to adapt to different kinds of speakers, while being inexpensive, and effective in almost all cases.
Le dispositif conforme à l'invention comporte, dans la paroi de l'enceinte, au moins une zone de fragilisation n'altérant pas les qualités mécaniques de l'enceinte dans des conditions normales de fonctionnement.The device according to the invention comprises, in the wall of the enclosure, at least one weakening zone which does not affect the qualities mechanical enclosure under normal operating conditions.
La présente invention sera mieux comprise à la lecture de la description détaillée d'un mode de réalisation, pris à titre d'exemple non limitatif et illustré par le dessin annexé, dont la figure unique est une vue partielle en coupe d'un propulseur de missile muni d'un dispositif conforme à l'invention.The present invention will be better understood on reading the detailed description of an embodiment, taken by way of example not limiting and illustrated by the appended drawing, the single figure of which is a view partial sectional view of a missile propellant fitted with a device conforming to the invention.
La présente invention est décrite ci-dessous en référence à un propulseur de missile soumis, dans son hangar de stockage, à un feu accidentel, mais il est bien entendu qu'elle n'est pas limitée à cette seule application, et qu'elle peut être mise en oeuvre dans d'autres applications comportant une enceinte métallique, déjà sous pression interne, ou bien contenant des produits pouvant la mettre en pression normale, et en surpression en cas d'accident, cette surpression provoquant l'explosion de l'enceinte avec projection violente d'éclats importants de cette enceinte.The present invention is described below with reference to a missile booster subjected to fire in its storage hangar accidental, but it is understood that it is not limited to this alone application, and that it can be implemented in other applications comprising a metal enclosure, already under internal pressure, or containing products which can put it under normal pressure, and overpressure in the event of an accident, this overpressure causing the explosion of the enclosure with violent projection of significant fragments of this enclosure.
Le propulseur 1 représenté sur la figure unique du dessin
comporte essentiellement une enceinte métallique cylindrique 2,
généralement en acier à l'intérieur de laquelle est disposée une charge de
propergol solide 3 à l'intérieur de laquelle est formé un canal central coaxial
4, destiné à permettre la combustion radiale du propergol 3 sur toute la
longueur du canal 4. Afin d'assurer une bonne adhérence entre le propergol
et l'enceinte, on tapisse la face interne de l'enceinte avec un agent de liaison
(dit : « liner ») 5, qui est généralement en polybutadiène ou polyuréthane.The
Selon l'invention, on pratique dans l'enceinte 3 une ou, de
préférence, plusieurs zones de fragilisation qui, en temps normal (en
l'absence d'incendie environnant), ne dégradent pas les qualités mécaniques
de l'enceinte, c'est-à-dire que le comportement du propulseur en
fonctionnement normal (en propulsion d'un missile, par exemple) n'en est
pas modifié. Dans le mode de réalisation illustré sur le dessin, ces zones de
fragilisation comportent chacune un trou 6 de petit diamètre (par exemple 3).
pour une enceinte d'un diamètre d'environ 160 mm, le nombre de ces trous
est d'environ 5 et ils sont régulièrement répartis sur toute la surface
périphérique de l'enceinte. Chacun de ces trous peut être, comme
représenté sur le dessin, un trou traversant, obturé par un bouchon 7
enfoncé à force dans le trou et pouvant être éjecté lorsque la pression
intérieure dépasse un seuil déterminé. Ce bouchon peut être en matériau
fusible à une température nettement inférieure à la température de fusion du
matériau de l'enceinte 2. Ce matériau fusible peut être par exemple de
l'étain. Selon un autre mode de réalisation, non représenté, les trous 6 sont
des trous borgnes (lamages) pratiqués depuis l'extérieur de l'enceinte, ou
bien des entailles rectilignes, polygonales ou circulaires pratiquées sur la
face périphérique externe de l'enceinte, et dont la profondeur est inférieure à
l'épaisseur de l'enceinte. According to the invention, one practices in enclosure 3 one or
preferably, several embrittlement zones which, in normal times (in
absence of surrounding fire), do not degrade the mechanical qualities
of the enclosure, that is to say that the behavior of the propellant in
normal operation (propelling a missile, for example) is not
not changed. In the embodiment illustrated in the drawing, these areas of
each embrittlement comprises a
Lorsque l'enceinte de l'invention est soumise à un incendie
extérieur, l'échauffement de sa paroi 2 provoque l'inflammation spontanée du
propergol 3. Les gaz engendrés par cette inflammation font monter la
pression à l'intérieur de l'enceinte. Lorsque cette pression commence à
monter, les obturateurs 7 des orifices 6 sont éjectés (ou fondent sous l'effet
de la chaleur s'ils sont en matériau fusible à une telle température). Dans le
cas de trous borgnes ou d'entailles, ceux-ci lâchent bien avant que la
pression interne n'atteigne une valeur pouvant provoquer l'explosion de
l'enceinte. L'échappement des gaz chauds de combustion par les orifices
ainsi dégagés échauffe les bords de ces orifices, ce qui les agrandit et
permet une évacuation plus rapide des gaz. Dans le cas extrême où la
combustion du propergol divergerait par allumage au niveau du canal central,
la brusque augmentation de la pression de rupture de l'enceinte serait
limitée. En effet, les propriétés de résistance mécanique de l'enceinte sont
dégradées par la présence des trous ou entailles de l'invention, et la pression
accrue dans le canal central est transmise à l'enceinte, dont les zones de
fragilisation finissent par céder avant que la pression n'atteigne la valeur
qu'elle aurait en l'absence de ces zones de fragilisation.When the enclosure of the invention is subjected to a fire
outside, the heating of its
De façon avantageuse, l'enceinte peut être recouverte d'un isolant thermique (peinture ou couche de matériau isolant) afin d'adapter le comportement des zones de fragilisation à l'évolution de la température de l'enceinte, en retardant cette montée en température.Advantageously, the enclosure can be covered with an insulator thermal (paint or layer of insulating material) in order to adapt the behavior of embrittlement zones at changes in temperature the enclosure, by delaying this rise in temperature.
Claims (6)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR0008517A FR2811074B1 (en) | 2000-06-30 | 2000-06-30 | DEVICE CONTROLLING THE BEHAVIOR OF A METAL ENCLOSURE, CONTAINING SPONTANEOUSLY FLAMMABLE MATERIALS, IN CASE OF EXTERNAL FIRE |
| FR0008517 | 2000-06-30 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1170569A2 true EP1170569A2 (en) | 2002-01-09 |
| EP1170569A3 EP1170569A3 (en) | 2002-04-03 |
Family
ID=8851962
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01401694A Withdrawn EP1170569A3 (en) | 2000-06-30 | 2001-06-26 | Device aiming at keeping under control the behaviour of a metallic container containing self-igniting material, in case of external fire |
Country Status (4)
| Country | Link |
|---|---|
| US (1) | US20020020454A1 (en) |
| EP (1) | EP1170569A3 (en) |
| FR (1) | FR2811074B1 (en) |
| NO (1) | NO20013224L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2777960C1 (en) * | 2022-01-12 | 2022-08-12 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Method for provision of safety of handling explosive product |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| ES2357845T3 (en) * | 2004-04-08 | 2011-05-03 | Rheinmetall Waffe Munition Gmbh | CARTRIDGE AMMUNITION, ESPECIALLY HALF CALIBER. |
| US9964387B2 (en) * | 2009-08-19 | 2018-05-08 | Orbital Atk, Inc. | Insensitive munitions swaged vent plug |
| CN104848755A (en) * | 2015-05-11 | 2015-08-19 | 河南理工大学 | Explosion chamber for explosion equipment performance experiments |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4084512A (en) * | 1976-10-18 | 1978-04-18 | The United States Of America As Represented By The Secretary Of The Navy | Pressure relief construction for controlled combustion of ordnance items |
| FR2627272A1 (en) * | 1988-02-11 | 1989-08-18 | France Etat Armement | Metal casing for explosive device - has multiple orifices formed in casing walls and sealed by plugs of low melting point metal alloy |
| EP0559436A1 (en) * | 1992-03-02 | 1993-09-08 | Thiokol Corporation | Solid propellant rocket motor case, comprising a material which melts down at undesirable temperatures above normal storage temperatures |
| US5564272A (en) * | 1994-07-29 | 1996-10-15 | Thiokol Corporation | Slotted hybrid pressure vessel |
-
2000
- 2000-06-30 FR FR0008517A patent/FR2811074B1/en not_active Expired - Fee Related
-
2001
- 2001-06-26 EP EP01401694A patent/EP1170569A3/en not_active Withdrawn
- 2001-06-27 NO NO20013224A patent/NO20013224L/en not_active Application Discontinuation
- 2001-06-29 US US09/893,665 patent/US20020020454A1/en not_active Abandoned
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4084512A (en) * | 1976-10-18 | 1978-04-18 | The United States Of America As Represented By The Secretary Of The Navy | Pressure relief construction for controlled combustion of ordnance items |
| FR2627272A1 (en) * | 1988-02-11 | 1989-08-18 | France Etat Armement | Metal casing for explosive device - has multiple orifices formed in casing walls and sealed by plugs of low melting point metal alloy |
| EP0559436A1 (en) * | 1992-03-02 | 1993-09-08 | Thiokol Corporation | Solid propellant rocket motor case, comprising a material which melts down at undesirable temperatures above normal storage temperatures |
| US5564272A (en) * | 1994-07-29 | 1996-10-15 | Thiokol Corporation | Slotted hybrid pressure vessel |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2777960C1 (en) * | 2022-01-12 | 2022-08-12 | Российская Федерация, от имени которой выступает Государственная корпорация по атомной энергии "Росатом" (Госкорпорация "Росатом") | Method for provision of safety of handling explosive product |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2811074B1 (en) | 2003-02-14 |
| EP1170569A3 (en) | 2002-04-03 |
| FR2811074A1 (en) | 2002-01-04 |
| NO20013224L (en) | 2001-12-31 |
| US20020020454A1 (en) | 2002-02-21 |
| NO20013224D0 (en) | 2001-06-27 |
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