SIST EN 2624:2009

Aerospace series - Pressure impulse testing of hydraulic system components

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 and 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 components shall be tested according to tailored test requirements as specified in detail specifications.

Luft- und Raumfahrt - Druckimpulsprüfung von Komponenten in Hydraulik-Anlagen

Série aérospatiale - Essai d'impulsion de pression des composants de systèmes hydrauliques

Aeronavtika - Tlačno sunkovno preskušanje komponent v hidravličnih sistemih

General Information

• Status: Published
• Publication Date: 22-Jun-2009
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: I13 - Imaginarni 13
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 29-May-2009
• Due Date: 03-Aug-2009
• Completion Date: 23-Jun-2009
• Ref Project: EN 2624:2007 - Aerospace series - Pressure impulse testing of hydraulic system components

Overview

EN 2624:2007 - published by CEN - defines a standardized test method for pressure impulse testing of hydraulic system components in the aerospace sector. The standard is restricted to passive hydraulic components (e.g., manifolds, filter housings) and establishes requirements and procedures to verify structural integrity under pressure-impulse type loading. Active components (actuators, landing gear hydraulics, brakes) are excluded and must be tested to tailored detail specifications.

Key topics and requirements

• Scope: Qualification of passive hydraulic components subject to system pressure fluctuations (impulse loading).
• Test focus: Structural integrity under repeated pressure impulses; waveform must conform to the pressure-time trace given in the standard (see Figure 1).
• Rate of rise: Typically less than 1 400 000 kPa/s (14 000 bar/s) unless a detail specification states otherwise.
• Cycling rate: Between 1 cycle/s (large components) and 5 cycles/s (small components); instrumentation required at rates above 1 cycle/s to verify applied stresses.
• Number of cycles: Unless otherwise specified, minimum 300 000 cycles for high-pressure cavities and 150 000 cycles for low-pressure cavities.
• Temperature and fluid: Maintain fluid and ambient temperature at the component's nominal operating temperature; use the component’s service fluid unless the detail specification specifies otherwise.
• Accuracy and recording: Test data must be accurate to ±2%. Pressure-time traces should be recorded with sufficient resolution and confinement to the specified shaded trace area.
• Specimen preparation and setup: Bleed entrapped air, allow non-pressure drains to remain at atmospheric pressure, and, if desired, place loose metal shot to minimize fluid volume.
• Post-test verification: After impulse testing perform performance checks defined in the detail specification, then disassemble and inspect for cracks or structural failure.
• Normative reference: ISO 6772 (impulse testing of hose, tubing and fittings) is referenced for related methods.

Applications and users

• Manufacturers of aerospace hydraulic passive components (manifolds, filter housings, distribution blocks)
• Flight hardware qualification and test laboratories performing endurance/impulse testing
• Design engineers writing component detail specifications and test requirements
• Certification bodies and maintenance organizations verifying component durability under hydraulic impulse loads

Related standards

• ISO 6772 - Aerospace - Fluid systems - Impulse testing of hydraulic hose, tubing and fitting assemblies (normative reference)
• Component-specific detail specifications or industry standards that define tailored test parameters for active components

EN 2624:2007 is essential for ensuring repeatable, auditable pressure-impulse qualification of passive hydraulic parts in aerospace systems and for creating consistent test programs referenced in design and certification documentation.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Luft- und Raumfahrt - Druckimpulsprüfung von Komponenten in Hydraulik-AnlagenSérie aérospatiale - Essai d'impulsion de pression des composants de systèmes hydrauliquesAerospace series - Pressure impulse testing of hydraulic system components49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 2624:2007SIST EN 2624:2009en,de01-september-2009SIST EN 2624:2009SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 2624July 2007ICS 49.080 English VersionAerospace series - Pressure impulse testing of hydraulic systemcomponentsSérie aérospatiale - Essai d'impulsion de pression descomposants de systèmes hydrauliquesLuft- und Raumfahrt - Druckimpulsprüfung vonKomponenten in Hydraulik-AnlagenThis European Standard was approved by 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 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 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, Netherlands, Norway, Poland, Portugal,Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2007 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 2624:2007: ESIST EN 2624:2009
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