ASD-STAN PREN 4649-2008 Aerospace series Handheld fire extinguishers with synthesis gases for aircraft use Technical specification and qualification conditions (Edition P 1)《航空航天系列.pdf

1、ASD STANDARD NORME ASD ASD NORM prEN 4649 Edition P 1 January 2008 PUBLISHED BY THE AEROSPACE AND DEFENCE INDUSTRIES ASSOCIATION OF EUROPE - STANDARDIZATION Avenue de Tervuren, 270 - B-1150 Brussels - Tel. + 32 2 775 8126 - Fax. + 32 2 763 3565 - www.asd-stan.orgICS: 49.060 Descriptors: ENGLISH VERS

2、ION Aerospace series Handheld fire extinguishers with synthesis gases, for aircraft use Technical specification and qualification conditions Srie arospatiale Extincteurs portatifs pour aronefs aux agents gazeux de synthse Spcification technique et conditions de qualification Luft- und Raumfahrt An B

3、ord Handfeuerlscher Lieferbedingungen und Qualifikationsbedingungen This “Aerospace Series“ Prestandard has been drawn up under the responsibility of ASD-STAN (The AeroSpace and Defence Industries Association of Europe - Standardization). It is published for the needs of the European Aerospace Indus

4、try. It has been technically approved by the experts of the concerned Domain following member comments. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identificatio

5、n of the standard. After examination and review by users and formal agreement of ASD-STAN, it will be submitted as a draft European Standard (prEN) to CEN (European Committee for Standardization) for formal vote and transformation to full European Standard (EN). The CEN national members have then to

6、 implement the EN at national level by giving the EN the status of a national standard and by withdrawing any national standards conflicting with the EN. Edition approved for publication 31 January 2008 Comments should be sent within six months after the date of publication to ASD-STAN Electrical Do

7、main Copyright 2008 by ASD-STAN prEN 4649:20082 Contents Page Foreword2 Introduction.3 1 Scope 3 2 Normative references3 3 Terms and definitions .4 4 Symbols and abbreviations4 5 Description .4 6 Design.5 7 Characteristics.7 8 Qualification tests10 9 Manufacturing requirements 21 10 Marking .24 11 M

8、aintenance .26 12 Quality assurance26 13 Qualification .26 14 Traceability.27 15 Packaging.27 16 Storage27 17 Recovery and recycling 27 Annex A (normative) Pressure and temperature diagram .28 Annex B (normative) Dielectric test diagram .29 Annex C (normative) Technical index.31 Annex D (normative)

9、Qualification tests.32 Foreword This standard was reviewed by the Domain Technical Coordinator of ASD-STANs Electrical Domain. After inquiries and votes carried out in accordance with the rules of ASD-STAN defined in ASD-STANs General Process Manual, this standard has received approval for Publicati

10、on. prEN 4649:20083 Introduction This standard is implemented to define aeronautical requirements regarding the following: all handheld fire extinguishers using synthesis gases; all aircraft; the need to protect persons, equipment and the environment (in particular the provisions concerning implemen

11、tation of the Montreal protocol). If the extinguisher uses a synthesis gas under the terms of a waiver to current legislation, all the tests except the extinguishing efficiency tests, shall be run using an authorised equivalent substitute agent. This standard is intended for fire extinguishers with

12、a maximum operating pressure up to 25 bar. 1 Scope This standard specifies the technical requirements and qualification conditions for handheld fire extinguishers made with metal vessels and using synthesis gases for aircraft use, designed for use in the cockpit, in the passenger cabin and to protec

13、t areas accessible to the crew. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) app

14、lies. ISO 3941, Classification of fires. ISO 7165, Fire fighting Portable fire extinguishers Performance and construction. EN 9100, Aerospace series Quality management systems Requirements (based on ISO 9001:2000) and Quality systems Model for quality assurance in design, development, production, in

15、stallation and servicing (based on ISO 9001:1994). EN 9103, Aerospace series Quality management systems Variation management of key characteristics. EN 9133, Aerospace series Quality management systems Qualification procedure for aerospace standard parts. EN 10002-1, Metallic materials Tensile testi

16、ng Part 1: Method of test at ambient temperature. EN 10204, Metallic products Types of inspection documents. DOT/FAA/AR-01-37, Development of a minimum performance standard for hand-held fire extinguishers as a replacement for Hamon 1211 on Civilian Transport Category Aircraft. 1)ED-14D/RTCA/DO-160,

17、 Environmental conditions and test procedures for airborne equipment.2)EASA Part 145, Maintenance Organisation Approvals. 3)1) Published by: Office of Aviation Research Washington, D.C. 20591. 2) Published by: EUROCAE, 102 rue Etienne Dolet 92240 Malakoff. 3) Published by: European Aviation Safety A

18、gency Postfach 10 12 53 D-50452 Koeln, Germany. prEN 4649:20084 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 pressure-relief safety device device which releases the pressure inside the vessel in the event of over-pressure 3.2 handheld fire

19、 extinguisher extinguisher designed to be carried and used by hand weighing 20 kg or less 3.3 bracket element used to hold the extinguisher on board 3.4 survival temperature temperature to which the extinguisher may be exposed without compromising subsequent use in the operating temperature range 3.

20、5 fire classes according to ISO 3941 the following fire classes may be identified: class A: these are fires of solid materials, generally organic in nature, the combustion of which normally leads to the formation of embers. class B: these are fires involving liquids or liquefiable solids. according

21、to this standard the following fire class is added: class H: these are fires in indirectly accessible spaces (Hidden fires). 4 Symbols and abbreviations bar Unit of pressure 1 bar is equal to 0,1 MPa IF Inspection File DF Definition File MF Manufacturing File P (T max.) Pressure at maximum operating

22、 temperature P (T min.) Pressure at minimum operating temperature TP Test Pressure TS Technical Specification T max. Maximum operating temperature T min. Minimum operating temperature V Internal volume of the vessel 5 Description A handheld fire extinguisher consists of, but is not limited to: a ves

23、sel; an extinguishing agent; a pressurisation agent if necessary (acting as the propellant); prEN 4649:20085 a pressure indicating device; a pick-up device; a controlling device; a projection device; a discharge hose if necessary; a pressure-relief safety device; a controlling device locking system;

24、 an indicator of not used. NOTE The bracket is independent of the extinguisher but shall be qualified jointly with it. 6 Design 6.1 General The fire extinguisher shall operate in vertical position with the actuating device on the top. No part shall easily be removable from the fire extinguisher and

25、its bracket except the controlling device locking system. The design of handheld fire extinguishers shall enable them to withstand the environmental conditions specific to the aeronautical field, as defined in Clause 8: mechanical (vibrations, crash resistance, operational shocks); climatic (tempera

26、ture, altitude, humidity, salt mist); electromagnetic, if applicable. 6.2 Materials The materials used to manufacture the fire extinguisher shall comply with the standards in force, shall be resistant to the extinguishing and pressurising agents and shall withstand the environmental and operating co

27、nditions. For this purpose, the designer shall determine the appropriate materials, heat treatments and protections. Magnesium alloys are prohibited. 6.3 Vessel The manufacturer shall obtain and record the analysis and testing certificates for the materials used to manufacture the vessels. The inspe

28、ction documents shall provide the composition of the material and results of the chemical analysis and the results of the mechanical tests in accordance with EN 10204. The vessel shall be made of metal and its design shall comply with the requirements of 7.2. If a material other than metal is used,

29、the manufacturer must show evidence that this material is compliant to the requirements set forth in this standard. Dedicated test procedures for this material must be developed by the supplier. 6.4 Extinguishing and pressurising agents The products used shall comply with the applicable standards an

30、d regulations in force. prEN 4649:20086 6.5 Pressure-relief safety device The fire extinguisher may be equipped with a pressure-relief safety device designed to protect the pressurised elements against over-pressure. The operation of this device shall be based on the pressure rise principle. The des

31、ign of this device shall comply with the requirements of 7.3.1. This device may also be used as a filling device. If not fitted with a pressure-relief safety device, the fire extinguisher shall be designed to automatically evacuate its entire contents safely, in case of over pressure. In this case,

32、the provisions of 7.3.2 shall apply. 6.6 Pressure indicating device The handheld fire extinguisher shall be equipped with a device indicating that the pressure of the fire extinguisher is within operating limits. 6.7 Pick-up device This device shall allow an efficient pick-up of the extinguishing ag

33、ent. 6.8 Projection device This device shall allow efficient and easy projection of the extinguishing agent onto the fire. 6.9 Controlling device This device shall be used to start and stop the flow of extinguishing agent. 6.10 Discharge hose The fire extinguishers with more than 2 kg of agent(s) sh

34、all be equipped with a hose. 6.11 Controlling-device locking system This device is designed to prevent inadvertent actuation. 6.12 Indicator of not used This device shall show whether the fire extinguisher has been operated. This may be in the form of a wire and seal or a mechanism which prevents re

35、-insertion of the safety device. 6.13 Bracket This device is used to hold the fire extinguisher on board. The fire extinguisher shall be easily removable from its bracket and the related operating method shall be obvious and non-ambiguous prEN 4649:20087 7 Characteristics 7.1 General All pressure sh

36、all be in accordance with Annex A. The pressure levels reached in the vessel shall be determined according to the agent(s) used, the filling coefficient, the pressurisation pressure, the maximum survival temperature. The minimum range of operating temperature is 40 C to 70 C. The minimum range of su

37、rvival temperature is 55 C to 85 C. An attachment of elements on the vessel shall not weaken its mechanical strength. 7.2 Vessel 7.2.1 Thickness of the wall The thickness of the wall shall be such that regardless of the extinguishing agent used and its vapour pressure, the 0,2 % offset yield strengt

38、h of the material chosen shall never be exceeded at the vessel test pressure. If markings are etched, these shall be done in a dedicated area. 7.2.2 Mechanical properties The ratio shall be: mp0.2RR 0,90 where: Rp0.2is the yield strength, see EN 10002-1. Rmis the tensile strength, see EN 10002-1. 7.

39、2.3 Test pressure The test pressure shall be minimum equal to 125 % of the pressure corresponding to the maximum survival temperature. 7.2.4 Burst pressure The burst pressure shall be minimum equal to 270 % of the pressure corresponding to the maximum survival temperature. 7.3 Safety in case of over

40、-pressure 7.3.1 Pressure-relief safety device Pressure levels for activation of the pressure relief safety device shall be: minimum: pressure equivalent to 105 % of the pressure at maximum survival temperature, maximum: pressure equivalent to the test pressure (7.2.3). prEN 4649:20088 7.3.2 Fire ext

41、inguisher without a pressure-relief safety device In case of over pressure, no mechanical element shall be ejected from the fire extinguisher and the fire extinguisher shall remain in its bracket. 7.4 Pressure indicating device The reading range of the pressure indicating device shall comprise (see

42、Figure 1): a zero reference (to indicate zero pressure). If there is a needle stop, it shall be below the zero reference; a green zone (4) corresponding to the pressures of the whole operating temperature range in accordance with the Figure 1. Key 1 Stop 2 Red 3 Rounded-off to 0,5 bar 4 Green P(T mi

43、n.)= Pressure at minimum operating temperature P(T max.)= Pressure at maximum operating temperature Figure 1 The pressures are rounded off to the nearest half-bar or bar. The zones located on either side of the green zone are red. To ensure that the pressure indication is readable, the characteristi

44、cs shall be as follows: the needle movement across the pressure zone shall allow a clear reading; a mark shall show the pressure at the temperature of 20 C. NOTE An indicating device giving the same indications as mentioned above is also acceptable. prEN 4649:20089 7.5 Pick-up device The pick-up dev

45、ice (e.g. plunger tube) shall allow drainage of at least 90 % of the extinguishing agent during the test defined in 8.4.1. 7.6 Controlling device The characteristics of the controlling device are as follows: actuation of the controlling device shall, within 2 s, start emission of the extinguishing a

46、gent stream and shall stop it as soon as the controlling device is released; tightness shall be ensured between two emissions to comply with 8.4.4; it shall be actuated with one hand only applying a maximum strength of 10 daN. 7.7 Controlling-device locking system The characteristics of the controll

47、ing-device locking system are as follows: it shall be unlocked with a strength between 2 daN to 10 daN; it shall withstand a strength of 20 daN applied to the controlling device without damage and shall remain removable after release of the force. 7.8 Indicator of not used When activated, it shall n

48、ot be possible to restore the indicator in its initial condition without intervention of qualified operator with appropriate tool. If the controlling device is operated, the status of indicator of not used shall change. 7.9 Projection device It shall allow an efficient projection of extinguishing ag

49、ent onto the fire. It shall create a visible stream to allow the user to orientate it onto the fire. 7.10 Discharge hose 7.10.1 Hose sizing fire extinguishers with more than 2 kg of agent(s) shall be equipped with a hose of minimum length 400 millimetres; if the fire extinguishers with 2 kg or less of agent(s) are equipped with a hose, the minimum length of this hose shall be 250 millimetres. 7.10.2 Hose mechanical strength The hose attached to the fire extinguisher an