1、 g49g50g3g38g50g51g60g44g49g42g3g58g44g55g43g50g56g55g3g37g54g44g3g51g40g53g48g44g54g54g44g50g49g3g40g59g38g40g51g55g3g36g54g3g51g40g53g48g44g55g55g40g39g3g37g60g3g38g50g51g60g53g44g42g43g55g3g47g36g58system componentsThe European Standard EN 2624:2007 has the status of a British StandardICS 49.080A
2、erospace series Pressure impulse testing of hydraulic BRITISH STANDARDBS EN 2624:2007BS EN 2624:2007This British Standard was published under the authority of the Standards Policy and Strategy Committee on 31 August 2007 BSI 2007ISBN 978 0 580 58249 3Amendments issued since publicationAmd. No. Date
3、CommentsCompliance with a British Standard cannot confer immunity from legal obligations.National forewordThis British Standard is the UK implementation of EN 2624:2007.The UK participation in its preparation was entrusted to Technical Committee ACE/69, Aerospace hydraulic systems, fluids and compon
4、ents.A list of organizations represented on this committee can be obtained on request to its secretary.This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application.EUROPEAN STANDARDNORME EUROPENNEEUROPISCHE NORMEN 2624July
5、 2007ICS 49.080English VersionAerospace series - Pressure impulse testing of hydraulic systemcomponentsSrie arospatiale - Essai dimpulsion de pression descomposants de systmes hydrauliquesLuft- und Raumfahrt - Druckimpulsprfung vonKomponenten in Hydraulik-AnlagenThis European Standard was approved b
6、y CEN on 13 April 2007.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards
7、 may be obtained on application to the CEN Management Centre or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the
8、CEN Management Centre has the same status as theofficial versions.CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherland
9、s, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMIT EUROPEN DE NORMALISATIONEUROPISCHES KOMITEE FR NORMUNGManagement Centre: rue de Stassart, 36 B-1050 Brussels 2007 CEN All rights of exploitation in any f
10、orm and by any means reservedworldwide for CEN national Members.Ref. No. EN 2624:2007: E2 Contents Page Foreword3 1 Scope 4 2 Normative references 4 3 Terms and definitions .4 4 Requirements.5 4.1 General5 4.2 Rate of rise .5 4.3 Cycling rate 5 4.4 Temperature .5 4.5 Number of cycles.5 4.6 Preparati
11、on of specimens.6 4.7 Test equipment 6 4.8 Test fluid.6 4.9 Performance after test.6 5 Test procedure.6 5.1 General6 5.2 Accuracy.6 5.3 Component set-up .6 5.4 Impulse test6 5.5 Component verification.6 EN 2624:20073 Foreword This document (EN 2624:2007) has been prepared by the Aerospace and Defenc
12、e Industries Association of Europe - Standardization (ASD-STAN). After enquiries and votes carried out in accordance with the rules of this Association, this Standard has received the approval of the National Associations and the Official Services of the member countries of ASD, prior to its present
13、ation to CEN. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by January 2008, and conflicting national standards shall be withdrawn at the latest by January 2008. Attention is drawn to the possibili
14、ty that some of the elements of this document may be the subject of patent rights. CEN and/or CENELEC shall not be held responsible for identifying any or all such patent rights. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bo
15、und to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden,
16、Switzerland and the United Kingdom. EN 2624:20074 1 Scope This test method shall be used to verify the structural integrity of certain hydraulic components under pressure impulse-type loading. For the purpose of pressure impulse testing the hydraulic system components shall be divided into passive a
17、nd active components. This standard establishes the requirements and the procedures for impulse testing of passive hydraulic components only. Unless otherwise specified in the detail specification or in existing component related standards, the following procedures shall be used. Active hydraulic co
18、mponents shall be tested according to tailored test requirements as specified in detail specifications. 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
19、latest edition of the referenced document (including any amendments) applies. ISO 6772, Aerospace Fluid systems Impulse testing of hydraulic hose, tubing and fitting assemblies. 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. 3.1 Components 3.1.1
20、 passive components passive components are units under pressure whose impulse loading in service primarily results from pressure fluctuations in the hydraulic system The number of cycles, the amplitudes and the wave shape of these impulses in general cannot be predicted or calculated with sufficient
21、 accuracy. Passive components are, for example: “manifolds“ and fluid distribution components except lines, fittings and hoses filter housings 3.1.2 active components active components are units under pressure which have to sustain (active) pressure pulses resulting from their own function in additi
22、on to the normal (passive) system pressure fluctuations The active portion of the impulse loading in general can be predicted or calculated or derived from the duty cycle of the component. Active components are, for example: flight control actuators and control components landing gear and other util
23、ity hydraulics braking and nose wheel steering hydraulics EN 2624:20075 3.2 shape of impulse trace when observed on an oscilloscope the impulse traces show as approximate pressure-time cycles The dynamic cycle produced by the test machine shall be in conformance with the trace illustrated in Figure
24、1. It is mandatory that the pressure time curve be confined to the shaded area on Figure 1. 3.3 rate of rise the rate of rise is defined as the slope of the pressure-time curve in the straight portion of the pressure increase portion For purposes of definition, the rate of rise shall be determined b
25、etween 10 % of the total rise above back pressure and 10 % of the total rise below peak pressure. Sweep rate of the oscilloscope shall be adjusted so that the slope of the pressure rise shall take advantage of the full size of the screen. The trace and photos of the impulse cycle should be an accura
26、te record of the impulse cycle and show a grid or other means to permit accurate checking. 4 Requirements 4.1 General When this standard is referenced in a design specification as part of the requirements the following requirements shall be specified: a) Nominal system pressure b) Operating fluid an
27、d ambient temperature c) Fluid 4.2 Rate of rise The rate of pressure rise shall be less than 1 400 000 kPa/s (14 000 bars/s) unless otherwise specified in the detail specification. 4.3 Cycling rate The cycling rate shall be between 1 cycle/s (large components) and 5 cycles/s (small components), with
28、 the actual cyclic rate to be defined in the component detail specification. At rates higher than 1 cycle/s the component shall be instrumented to verify that intended stresses are applied. 4.4 Temperature The fluid and ambient temperature during testing shall be maintained at the nominal component
29、operating temperature as specified in the detail specification. 4.5 Number of cycles Unless otherwise specified in the detail specification, the following number of pressure impulse cycles shall be applied as a minimum separately to both the pressure and returns (when applicable), cavities of the co
30、mponent. Avoid backflowing electro-hydraulic servo valves if present in the assembly under test. High pressure Low pressure 300 000 cycles 150 000 cycles See Figure 1. EN 2624:20076 4.6 Preparation of specimens The preparation of test specimens shall be defined in the component detail specification.
31、 4.7 Test equipment The test equipment and circuit shall produce repeatable pressure pulses within the limits defined in 3.2. 4.8 Test fluid The fluid used for the test shall be the service fluid of the component undergoing the test, unless otherwise specified in the component detail specification.
32、4.9 Performance after test The component shall conform to the performance requirements specified in the detail specification after completion of the impulse testing. 5 Test procedure 5.1 General This method of testing is intended to determine the ability of hydraulic system components to withstand h
33、ydraulic impulse for qualification testing. 5.2 Accuracy Set up and maintain equipment accuracy so that all data are accurate within 2 % of actual. 5.3 Component set-up Bleed entrapped air from the component and test circuit being pressurised. Allow all drains and low pressure ports that are not par
34、t of the pressure containing envelopes to drain freely and keep them at atmospheric pressure. Metal shot or loosely fitting metal pieces may be placed in the unit under test is desired to minimize fluid volume. 5.4 Impulse test Conduct the impulse test as required in Clause 4 and the detail specific
35、ation. 5.5 Component verification After completion of the pressure impulse testing, the unit shall be tested to the performance limits specified in 4.9. The unit shall then be disassembled and inspected for cracks or structural failure. EN 2624:20077 15 505 1002 %0251351201151101007550Percent of cyc
36、le Percent of rated pressure50 NOTE Rated pressure for high pressure components: 100 % nominal system pressure Rated pressure for low pressure components: 50 % nominal system pressure Figure 1 Pressure impulse trace EN 2624:2007BS EN BSI389 Chiswick High RoadLondonW4 4AL2624:2007BSI British Standard
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