WO2007039650A1 - Método de protección de depósitos de combustible fabricados con materiales compuestos contra descargas eléctricas - Google Patents
Método de protección de depósitos de combustible fabricados con materiales compuestos contra descargas eléctricas Download PDFInfo
- Publication number
- WO2007039650A1 WO2007039650A1 PCT/ES2005/070133 ES2005070133W WO2007039650A1 WO 2007039650 A1 WO2007039650 A1 WO 2007039650A1 ES 2005070133 W ES2005070133 W ES 2005070133W WO 2007039650 A1 WO2007039650 A1 WO 2007039650A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- fuel tank
- devices
- metal
- metal devices
- fuel
- 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.)
- Ceased
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64D—EQUIPMENT FOR FITTING IN OR TO AIRCRAFT; FLIGHT SUITS; PARACHUTES; ARRANGEMENT OR MOUNTING OF POWER PLANTS OR PROPULSION TRANSMISSIONS IN AIRCRAFT
- B64D37/00—Arrangements in connection with fuel supply for power plant
- B64D37/32—Safety measures not otherwise provided for, e.g. preventing explosive conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/46—Arrangements for carrying off, or preventing the formation of electrostatic charges
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
- F16L25/00—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00
- F16L25/02—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00 specially adapted for electrically insulating the two pipe ends of the joint from each other
- F16L25/026—Construction or details of pipe joints not provided for in, or of interest apart from, groups F16L13/00 - F16L23/00 specially adapted for electrically insulating the two pipe ends of the joint from each other for flanged joints
Definitions
- the invention relates to a method of protection against electric shock caused by lightning strikes in fuel tanks made of low electrical conductivity materials and in particular to a method for the protection of devices such as pipes, valves or pumps present in its inside.
- Composite materials offer high electrical resistance compared to metallic materials.
- the latter have traditionally been used in the aeronautical context for the manufacture of structures intended for fuel storage, given their mechanical characteristics in relation to the weight of these materials.
- the high electrical resistance inherent in composite materials causes an induction effect of great relevance in the internal systems of the fuel tank. Said effect induces internal electrical currents that can cause catastrophic failures or phenomena for the overall structural integrity.
- the phenomena related to moderate or severe electrical discharges produced in the case of lightning impact and that must be prevented in a structure made of low electrical conductivity material to ensure its structural integrity / malfunction of some of the critical electrical equipment / electric arcs in The interior of the tank are: Hot Spots: the high current density in certain specific locations of the structure as joints or elements of intersection can cause high temperature points. If this temperature exceeds 200 0 C (point of auto ignition of the fuel considered by authorities F AA / J AA), the fuel can reach its flash point in case the appropriate stoichiometric concentrations are present inside the tank .
- the objective of the present invention is oriented to the protection of the fuel tanks of aircraft located on their wings and / or stabilizers made of composite materials and provided with various electrical equipment against electric shocks but is applicable to any structure constructed in a material of low electrical conductivity and that possess flammable fluids in its interior as well as electrical and / or fluid-dynamic systems in its interior.
- the present invention proposes a method to protect the set of metal devices arranged inside a fuel tank, manufactured entirely or partially with composite materials, against electric shock, by means of which: a) an insulating element is included in the points of fixing / securing the metal devices to the fuel tank, to ensure the electrical isolation of said metal devices from the fuel tank; b) insulating inserts are included in the linear metal devices so that they are subdivided into isolated parts between them; c) in each of the parts isolated from each other of the set of metal devices, a connection with metal substructures of very low resistance is provided.
- Figure 1 schematically shows the application of the method according to the invention to a fuel tank provided with several devices.
- Figure 2 shows a pipe located inside a protected fuel tank according to the method of the present invention.
- Figure 3 shows a support located in the wall of a protected fuel tank according to the method of the present invention.
- a fuel tank 11 made of a material with low electrical conductivity, a device 13 consisting of a fuel line and a device 15 consisting of an equipment with a metal housing is observed.
- the set of devices 13, 15 represents the metal installations located inside the tank 11 that are necessary for the handling of the fuel.
- insulating elements 21, which may be made of a plastic material, are included in the fixing / securing points of the devices 13 and 15 to the tank 11 to isolate said devices 13 and 15 from the tank eleven.
- Figure 3 shows a specific example of insulating element 21 at a point of attachment of equipment to the tank 11.
- insulating inserts 23 of non-conductive material for example plastic, are included in the pipe 13, delimiting parts 31, 33 and 35 insulated therebetween.
- Figure 2 shows an example of an insulating insert 23 in the pipe 13 located between two connections with a substructure 25 of reference potential.
- connections of the parts 31, 33, 35 of the pipe 13 and of the device 15 are provided, which can be considered as a part isolated from other devices, with a substructure 25 of reference potential ("0 volts").
- the devices 13 and 15, which may be submerged in the fuel, can be charged to certain levels as a result of the generation of static charge after receiving an electric shock the tank 11, but said connections prevent the appearance of electric arcs and prevent the increase of said load up to admissible energy levels (200 micro-Joules), by draining the static load and preventing its accumulation in the system components.
- the basis of the method object of the present invention resides in preventing the current Ce flowing through the external walls of the fuel tank 11 as a result of an electric shock produced, for example, by the impact of a lightning bolt, can drift towards the internal areas where devices 13 and 15 are located.
- the only path for the external current Ce is the one that provides the connection points to the substructure 25 of reference potential (metallic ).
- the insulating inserts 23 in the fuel pipes 13 or any other linear device avoid the possibility that the current Ci forms closed circuits in which circulation of high current densities occurs recurrently.
- the insulating inserts 23 must maintain certain dimensions in length to prevent electric arcs.
- the range of distances in aircraft fuel tanks designed and manufactured by Airbus applicable that have been tested and applied is between 25 - 80 mm.
- the insulating inserts 23 In order to withstand the potential differences that may appear in the face of severe electric shock, the insulating inserts 23 must be made of insulating material, capable of providing an electrical resistance exceeding 100 mega-ohms.
- these insulating inserts 23 much of the essence of the technique that is proposed in this application resides, since they prevent high electrical currents circulating through the metal parts belonging to the internal systems of the fuel tank of .
- these insulating components must have a very novel design / material / geometry (a) since they must be located in very small places or in very short sections of pipes.
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Aviation & Aerospace Engineering (AREA)
- Cooling, Air Intake And Gas Exhaust, And Fuel Tank Arrangements In Propulsion Units (AREA)
- Elimination Of Static Electricity (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Abstract
Description
Claims
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES2005/070133 WO2007039650A1 (es) | 2005-09-29 | 2005-09-29 | Método de protección de depósitos de combustible fabricados con materiales compuestos contra descargas eléctricas |
| CA002624511A CA2624511A1 (en) | 2005-09-29 | 2005-09-29 | Method of protecting fuel tanks manufactured with composites against electrical discharges |
| CN2005800521296A CN101312879B (zh) | 2005-09-29 | 2005-09-29 | 针对放电保护由复合材料制造的燃料罐的方法 |
| JP2008532811A JP4995823B2 (ja) | 2005-09-29 | 2005-09-29 | 複合材料でつくられた燃料タンクを放電から保護する方法 |
| BRPI0520590-5A BRPI0520590A2 (pt) | 2005-09-29 | 2005-09-29 | método de proteção de tanques de combustìvel fabricados com materiais compostos contra descargas elétricas |
| EP05799717A EP1939088A4 (en) | 2005-09-29 | 2005-09-29 | PROCESS FOR PROTECTING FUEL TANKS FROM COMPOSITE MATERIALS AGAINST ELECTRICAL DISCHARGES |
| US11/273,636 US20080013246A1 (en) | 2005-09-29 | 2005-11-14 | Method of protecting fuel tanks manufactured with composites against electrical discharges |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/ES2005/070133 WO2007039650A1 (es) | 2005-09-29 | 2005-09-29 | Método de protección de depósitos de combustible fabricados con materiales compuestos contra descargas eléctricas |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2007039650A1 true WO2007039650A1 (es) | 2007-04-12 |
Family
ID=37905958
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/ES2005/070133 Ceased WO2007039650A1 (es) | 2005-09-29 | 2005-09-29 | Método de protección de depósitos de combustible fabricados con materiales compuestos contra descargas eléctricas |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US20080013246A1 (es) |
| EP (1) | EP1939088A4 (es) |
| JP (1) | JP4995823B2 (es) |
| CN (1) | CN101312879B (es) |
| BR (1) | BRPI0520590A2 (es) |
| CA (1) | CA2624511A1 (es) |
| WO (1) | WO2007039650A1 (es) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007074177A1 (es) | 2005-12-23 | 2007-07-05 | Airbus España, S.L. | Dispositivo de aislamiento eléctrico en conductos de combustible |
| WO2008000854A1 (es) | 2006-06-22 | 2008-01-03 | Airbus España, S.L. | Sistema de aislamiento de corriente para sistemas de fluidos |
| CN101815584A (zh) * | 2007-06-15 | 2010-08-25 | 波音公司 | 绝缘涂层的应用 |
| US9090355B2 (en) | 2009-03-30 | 2015-07-28 | Mitsubishi Heavy Industries, Ltd. | Composite tank, wing, and method for manufacturing composite tank |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2473226A (en) * | 2009-09-04 | 2011-03-09 | Hexcel Composites Ltd | Composite materials |
| US8956556B2 (en) * | 2008-07-02 | 2015-02-17 | Eaton Corporation | Dielectric isolators |
| US9136036B2 (en) * | 2008-07-02 | 2015-09-15 | Miller Waster Mills | Injection moldable, thermoplastic composite materials |
| US8003014B2 (en) | 2008-07-02 | 2011-08-23 | Eaton Corporation | Dielectric isolators |
| JP5210925B2 (ja) * | 2009-02-27 | 2013-06-12 | 三菱重工業株式会社 | 燃料タンクの発火防止構造 |
| JP5101554B2 (ja) * | 2009-03-30 | 2012-12-19 | 三菱重工業株式会社 | 航空機の燃料タンク |
| FR2948254B1 (fr) * | 2009-07-16 | 2011-12-30 | Airbus Operations Sas | Dispositif de protection de tuyauteries contre la foudre |
| EP2964533A1 (en) * | 2013-03-06 | 2016-01-13 | Bombardier Inc. | Tank wall connector system |
| US11530633B2 (en) * | 2019-12-05 | 2022-12-20 | Rolls-Royce Corporation | Efficient grounding of electrical connection with challenging bonding path |
| DE102021105609A1 (de) * | 2021-03-09 | 2022-09-15 | Airbus Operations Gmbh | Strömungskörper für ein Luftfahrzeug mit integriertem Gastank |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4479163A (en) * | 1982-09-30 | 1984-10-23 | The Boeing Company | Integral lightning protection system for composite aircraft skins |
| US4654747A (en) | 1985-09-30 | 1987-03-31 | The Boeing Company | Dielectric isolation of metallic conduits |
| ES2006356A6 (es) * | 1988-03-07 | 1989-04-16 | Const Aeronauticas Sa | Un sistema de proteccion contra descargas electricas, especialmente rayos, de componentes estructurales de aviones, particularmente depositos o tanques de combustible fabricados de materiales compuestos. |
| US4985801A (en) | 1987-07-02 | 1991-01-15 | Aerospatiale Societe Nationale Industrielle | Tube for the circulation of a flammable fluid, and conduit made from such tubes |
| EP0976653A1 (en) * | 1998-07-29 | 2000-02-02 | Construcciones Aeronauticas, S.A. | Lightning protection system for composite aircraft structures |
| EP1484245A1 (en) * | 2003-06-06 | 2004-12-08 | Airbus Espana, S.L. | Lightning strike protection system for aircraft fuel tanks made of low electrical conductivity composite material |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4630789A (en) * | 1983-09-23 | 1986-12-23 | The Boeing Company | Dielectric isolated fuel and hydraulic tubes |
| FR2609546B1 (fr) * | 1987-01-08 | 1991-01-04 | Aerospatiale | Procede et systeme pour la determination de la position longitudinale du centre de gravite d'un aeronef pourvu d'un empennage horizontal reglable |
| US4971268A (en) * | 1988-11-23 | 1990-11-20 | The Boeing Company | Dielectric support and wear sleeve |
| CN2178701Y (zh) * | 1993-12-29 | 1994-10-05 | 王玉忠 | 原油罐防爆半导体加热棒 |
| JP3517773B2 (ja) * | 1998-04-07 | 2004-04-12 | 豊田合成株式会社 | 燃料ホース用樹脂製継手 |
| CN2338270Y (zh) * | 1998-06-19 | 1999-09-15 | 中国航空工业总公司第六○一研究所 | 飞机空速管的防雷击装置 |
| US7001158B2 (en) * | 2003-01-24 | 2006-02-21 | Sturman Industries, Inc. | Digital fluid pump |
-
2005
- 2005-09-29 BR BRPI0520590-5A patent/BRPI0520590A2/pt not_active Application Discontinuation
- 2005-09-29 EP EP05799717A patent/EP1939088A4/en not_active Withdrawn
- 2005-09-29 WO PCT/ES2005/070133 patent/WO2007039650A1/es not_active Ceased
- 2005-09-29 CN CN2005800521296A patent/CN101312879B/zh not_active Expired - Fee Related
- 2005-09-29 CA CA002624511A patent/CA2624511A1/en not_active Abandoned
- 2005-09-29 JP JP2008532811A patent/JP4995823B2/ja not_active Expired - Fee Related
- 2005-11-14 US US11/273,636 patent/US20080013246A1/en not_active Abandoned
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4479163A (en) * | 1982-09-30 | 1984-10-23 | The Boeing Company | Integral lightning protection system for composite aircraft skins |
| US4654747A (en) | 1985-09-30 | 1987-03-31 | The Boeing Company | Dielectric isolation of metallic conduits |
| US4985801A (en) | 1987-07-02 | 1991-01-15 | Aerospatiale Societe Nationale Industrielle | Tube for the circulation of a flammable fluid, and conduit made from such tubes |
| ES2006356A6 (es) * | 1988-03-07 | 1989-04-16 | Const Aeronauticas Sa | Un sistema de proteccion contra descargas electricas, especialmente rayos, de componentes estructurales de aviones, particularmente depositos o tanques de combustible fabricados de materiales compuestos. |
| EP0976653A1 (en) * | 1998-07-29 | 2000-02-02 | Construcciones Aeronauticas, S.A. | Lightning protection system for composite aircraft structures |
| EP1484245A1 (en) * | 2003-06-06 | 2004-12-08 | Airbus Espana, S.L. | Lightning strike protection system for aircraft fuel tanks made of low electrical conductivity composite material |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2007074177A1 (es) | 2005-12-23 | 2007-07-05 | Airbus España, S.L. | Dispositivo de aislamiento eléctrico en conductos de combustible |
| WO2008000854A1 (es) | 2006-06-22 | 2008-01-03 | Airbus España, S.L. | Sistema de aislamiento de corriente para sistemas de fluidos |
| CN101815584A (zh) * | 2007-06-15 | 2010-08-25 | 波音公司 | 绝缘涂层的应用 |
| CN101815584B (zh) * | 2007-06-15 | 2014-02-26 | 波音公司 | 绝缘涂层的应用 |
| US9090355B2 (en) | 2009-03-30 | 2015-07-28 | Mitsubishi Heavy Industries, Ltd. | Composite tank, wing, and method for manufacturing composite tank |
Also Published As
| Publication number | Publication date |
|---|---|
| US20080013246A1 (en) | 2008-01-17 |
| EP1939088A1 (en) | 2008-07-02 |
| CA2624511A1 (en) | 2007-04-12 |
| JP4995823B2 (ja) | 2012-08-08 |
| CN101312879B (zh) | 2010-05-12 |
| CN101312879A (zh) | 2008-11-26 |
| EP1939088A4 (en) | 2012-04-18 |
| BRPI0520590A2 (pt) | 2009-05-19 |
| JP2009509848A (ja) | 2009-03-12 |
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