SIST EN 4021:2004

Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90°, bulkhead

This standard specifies the characteristics of elbows 90°, bulkhead, for pipe couplings 8°30', in titanium alloy, for aerospace
applications.
Nominal pressure: up to 28 000 kPa
Temperature range:   55 °C to 135 °C

Luft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Winkel-Schottverschraubungen 90°

Diese Norm legt die Eigenschaften von Winkel-Schottverschraubungen 90 , für Rohrverschraubungen 8 30', aus
Titanlegierung, zur Verwendung in der Luft- und Raumfahrt fest.
Nenndruck: bis 28 000 kPa
Temperaturbereich:   55  C bis 135  C

Série aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords coudés a 90° pour traversée de cloison

La présente norme spécifie les caractéristiques des raccords coudés à 90° pour traversée de cloison, pour les systèmes
de raccordement 8°30', en alliage de titane, pour applications aérospatiales.
Pression nominale: jusqu'à 28 000 kPa
Plage de température:   55 °C à 135 °C

Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90°, bulkhead

General Information

• Status: Published
• Publication Date: 30-Apr-2004
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: I08 - Imaginarni 08
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-May-2004
• Due Date: 01-May-2004
• Completion Date: 01-May-2004
• Ref Project: EN 4021:2001 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90°, bulkhead

Overview

EN 4021:2001 specifies the characteristics of 90° bulkhead elbows for the aerospace series pipe coupling 8°30' manufactured in titanium alloy. The standard targets aerospace fluid systems requiring reliable bulkhead penetrations at high pressure and defined temperature ranges. Key design conditions in the standard: nominal pressure up to 28 000 kPa (≈280 bar) and temperature range 55 °C to 135 °C.

Keywords: EN 4021:2001, pipe coupling 8°30', titanium alloy elbows, 90° bulkhead elbow, aerospace fluid systems, nominal pressure 28 000 kPa.

Key topics and technical requirements

• Configuration, dimensions and mass: Defined by figure and table in the standard (values apply before lubrication). Unspecified dimensions may be chosen by the manufacturer provided EN 3275 type II qualification/acceptance is met.
• Materials: Titanium alloy per referenced aerospace material standards (EN 3311 / EN 3312 / EN 3314 / EN 3315), ensuring compatibility with aerospace structural and corrosion requirements.
• Surface treatment and lubrication:
  • Lubrication on threads and sealing faces per EN 2491.
  • Prior abrasive blasting with non‑metallic grit is required.
  • Lubricant film thickness: 0.005 mm to 0.013 mm.
• Internal surface finishing: Radius R = 0.3 mm to 1.0 mm, surface roughness 0.8 µm; hand deburring is prohibited.
• Threads and sealing geometry: Threads reference ISO 5855‑3 (MJ threads) and thread/sealing geometry per EN 3274 and EN 3275.
• Marking and identification: Marking style A and figure 1 as per EN 2424; designation and optional code placement specified.
• Technical specification and acceptance: Dynamic beam seal and acceptance tests referenced to EN 3275 (type II).

Applications and who uses this standard

• Aerospace OEMs and suppliers designing and manufacturing titanium 90° bulkhead elbows for fluid and hydraulic systems.
• Design and stress engineers specifying fittings for high-pressure aerospace piping (pipe coupling 8°30').
• Quality assurance, procurement and certification bodies evaluating compliance with European aerospace component standards.
• Maintenance organizations and repair stations selecting replacement bulkhead elbows and verifying surface finish, marking and lubrication requirements.

Related standards

Primary normative references included in EN 4021:2001:

• ISO 5855-3 (MJ threads)
• EN 2424 (marking)
• EN 2491 (dry lubricant coating)
• EN 3267 (washers, bulkhead, titanium)
• EN 3274 / EN 3275 (pipe coupling geometry and technical specification)
• EN 3311, EN 3312, EN 3314, EN 3315 (titanium alloy material specifications)

Use EN 4021:2001 when you need a baseline specification for titanium 90° bulkhead elbows in aerospace fluid systems, ensuring dimensional compatibility, surface finish, material selection and installation practices for high-pressure applications.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90°, bulkheadLuft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Winkel-Schottverschraubungen 90°Série aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords coudés a 90° pour traversée de cloisonAerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90°, bulkhead49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4021:2001SIST EN 4021:2004en01-maj-2004SIST EN 4021:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4021October 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' in titanium alloy - Elbows90°, bulkheadSérie aérospatiale - Système de raccordement 8°30' enalliage de titane - Raccords coudés à 90° pour traversée decloisonLuft- und Raumfahrt - Rohrverschraubung 8°30' ausTitanlegierung - Winkel-Schottverschraubungen 90°This European Standard was approved by CEN on 29 December 2000.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 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 Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2001 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 4021:2001 ESIST EN 4021:2004

ScopeThis standard specifies the characteristics of elbows 90°, bulkhead, for pipe couplings 8°30', in titanium alloy, for aerospaceapplications.Nominal pressure: up to 28 000 kPaTemperature range:
55 °C to 135 °C2
Normative referencesThis European
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