EP1170568A2 - Vorrichtung zur Minimierung der Verpuffung eines Metallbehälters im Falle gefährlichen Überdrucks im Innern - Google Patents

Vorrichtung zur Minimierung der Verpuffung eines Metallbehälters im Falle gefährlichen Überdrucks im Innern Download PDF

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Publication number
EP1170568A2
EP1170568A2 EP01401693A EP01401693A EP1170568A2 EP 1170568 A2 EP1170568 A2 EP 1170568A2 EP 01401693 A EP01401693 A EP 01401693A EP 01401693 A EP01401693 A EP 01401693A EP 1170568 A2 EP1170568 A2 EP 1170568A2
Authority
EP
European Patent Office
Prior art keywords
enclosure
pyrotechnic system
overpressure
ignition
deflagration
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Withdrawn
Application number
EP01401693A
Other languages
English (en)
French (fr)
Other versions
EP1170568A3 (de
Inventor
Olivier c/o THALES Intellectual Property Dassis
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Protac
Original Assignee
Protac
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Protac filed Critical Protac
Publication of EP1170568A2 publication Critical patent/EP1170568A2/de
Publication of EP1170568A3 publication Critical patent/EP1170568A3/de
Withdrawn legal-status Critical Current

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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
    • 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
    • F42B39/14—Explosion or fire protection arrangements on packages or ammunition

Definitions

  • the present invention relates to a minimization device explosion effects of a metal enclosure in the event of overpressure accidental internal.
  • the subject of the present invention is a device making it possible to minimize the explosion effects of a metal enclosure subjected to internal overpressure, for example a missile booster enclosure, overpressure in the event of a fire to which it would be subjected, 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 a system pyrotechnic fixed to the enclosure which is triggered as soon as there is detection of a phenomenon causing the rise in overpressure in the enclosure, the fire of this pyrotechnic system causing, by heating, the fall limited local mechanical characteristics of the enclosure.
  • 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 comprises essentially an enclosure 2 of circular cylindrical shape enclosing a coaxial inner central channel 3, the space between this channel 3 and enclosure 2 being filled with propellant 4.
  • a binding agent 7 (known as "liner"), which is generally made of polybutadiene or polyurethane.
  • a box 5 containing a pyrotechnic composition 6 there is fixed on the external face of the enclosure 2 a box 5 containing a pyrotechnic composition 6.
  • This composition 6 releases, when ignited, a large amount of calories, sufficient to locally degrade the mechanical properties of enclosure 2 to the point that during the auto-ignition of the propellant 4 due to its heating due to a fire, the pressure thus generated in the enclosure does not have the time to reach a too high value and to provoke the violent reaction supra.
  • this internal pressure begins to increase, while remaining relatively low (at a value easily supported by the enclosure under normal conditions)
  • the part of the enclosure weakened by the significant heating due to composition 6 opens without practically produce splinters, and lets escape the gases under pressure produced by propellant inflammation.
  • composition 6 is propellant or a pyrotechnic composition, and its volume is approximately 10 cm 3 for a steel enclosure, with a thickness of approximately 1.5 mm and length 10 cm.
  • the nature and the quantity of composition 6 are adapted to the characteristics of the enclosure 2, and of the propellant 4.
  • composition 6 can be either spontaneous by following its heating due to the fire, or triggered by a appropriate firing connected to a thermal sensor fixed to the enclosure 2.
  • a layer of thermal insulating material which allows delay the heating of propellant 4 to allow time for composition 6 to sufficiently weaken the local mechanical characteristics of enclosure 2.
  • the box 5 with the composition 6 are fixed inside the enclosure 2, in contact with the latter.
  • Such a mode of realization although less easy to realize than the embodiment described above, may have advantages in other applications, for example of the fact that the box 5 does not constitute a "wart" outside of the enclosure and therefore is not likely to be torn off accidentally, by example during handling of the enclosure, or does not constitute embarrassment, for example to move the enclosure.
  • the device of the invention makes it possible to avoid the violent explosion of an enclosure which either contains products capable of ignite by self-ignition or explode as a result of overheating of the enclosure, or is under internal pressure in normal conditions, but this internal pressure can rise excessively under abnormal conditions (overheating, modification content composition, internal short circuit ).
  • the ignition of composition 6 is triggered spontaneously or by a suitable physical or chemical condition sensor ( pressure, temperature, gas sensor ).

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Fire-Extinguishing By Fire Departments, And Fire-Extinguishing Equipment And Control Thereof (AREA)
  • Safety Valves (AREA)
EP01401693A 2000-06-30 2001-06-26 Vorrichtung zur Minimierung der Verpuffung eines Metallbehälters im Falle gefährlichen Überdrucks im Innern Withdrawn EP1170568A3 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR0008516A FR2811053B1 (fr) 2000-06-30 2000-06-30 Dispositif de minimisation des effets deflagrants d'une enceinte metallique en cas de surpression interne accidentelle
FR0008516 2000-06-30

Publications (2)

Publication Number Publication Date
EP1170568A2 true EP1170568A2 (de) 2002-01-09
EP1170568A3 EP1170568A3 (de) 2002-04-03

Family

ID=8851961

Family Applications (1)

Application Number Title Priority Date Filing Date
EP01401693A Withdrawn EP1170568A3 (de) 2000-06-30 2001-06-26 Vorrichtung zur Minimierung der Verpuffung eines Metallbehälters im Falle gefährlichen Überdrucks im Innern

Country Status (4)

Country Link
US (1) US20020020323A1 (de)
EP (1) EP1170568A3 (de)
FR (1) FR2811053B1 (de)
NO (1) NO20013225L (de)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2908506A1 (fr) * 2006-11-14 2008-05-16 Protac Systeme de protection pour dispositif contenant une matiere reagissant violemment a un echauffement
EP2113733A1 (de) * 2008-04-30 2009-11-04 Saab Ab Waffe mit IM-Eigenschaften

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6952995B2 (en) * 2002-01-11 2005-10-11 Aerojet-General Corporation Apparatus and method for passive venting of rocket motor or ordnance case
US7530314B2 (en) * 2004-05-25 2009-05-12 Lockheed Martin Corporation Thermally initiated venting system and method of using same
DE102004038039A1 (de) * 2004-08-05 2006-02-23 Diehl Bgt Defence Gmbh & Co. Kg Raketenmotor
US7472653B1 (en) * 2006-06-15 2009-01-06 United States Of America As Represented By The Secretary Of The Navy Insensitive munitions warhead explosive venting system
US9255774B2 (en) 2008-06-30 2016-02-09 Battelle Memorial Institute Controlled fragmentation of a warhead shell
FR2948186B1 (fr) * 2009-07-17 2015-02-20 Tda Armements Sas Munition comprenant des moyens pour neutraliser son chargement explosif
US10670381B1 (en) * 2013-09-17 2020-06-02 The United States Of America, As Represented By The Secretary Of The Navy Electronic thermally-initiated venting system (ETIVS) for rocket motors

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4478151A (en) * 1983-02-28 1984-10-23 The United States Of America As Represented By The Secretary Of The Navy Pressure vessel penetrator
US4597261A (en) * 1984-05-25 1986-07-01 Hughes Aircraft Company Thermally actuated rocket motor safety system
US5129326A (en) * 1987-04-14 1992-07-14 Aerojet-General Corporation Ordnance device with explosion protection
US5206456A (en) * 1989-08-24 1993-04-27 The United States Of America As Represented By The Secretary Of The Navy Ordinance thermal battery

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2908506A1 (fr) * 2006-11-14 2008-05-16 Protac Systeme de protection pour dispositif contenant une matiere reagissant violemment a un echauffement
EP1923659A1 (de) 2006-11-14 2008-05-21 Protac Schutzsystem für eine Vorrichtung, die eine Substanz enthält, die heftig auf Erhitzung reagiert
EP2113733A1 (de) * 2008-04-30 2009-11-04 Saab Ab Waffe mit IM-Eigenschaften
US7913608B1 (en) 2008-04-30 2011-03-29 Saab Ab Weapon with IM-characteristics

Also Published As

Publication number Publication date
NO20013225D0 (no) 2001-06-27
US20020020323A1 (en) 2002-02-21
FR2811053B1 (fr) 2003-06-13
NO20013225L (no) 2001-12-31
EP1170568A3 (de) 2002-04-03
FR2811053A1 (fr) 2002-01-04

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