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

This standard specifies the characteristics of elbows 90°, bulkhead, welded end, long, 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° mit Anschweißende lange Ausführung

Diese Norm legt die Eigenschaften von Winkel-Schottverschraubungen 90° mit Anschweißende, lang, 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 - Système de raccordement 8°30' en alliage de titane - Raccords coudés à 90° pour traversée de cloison, type long à souder

La présente norme spécifie les caractéristiques des raccords coudés à 90  à souder, pour traversée de cloison, type long,
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, long, welded end

General Information

Status
Published
Publication Date
23-Oct-2001
Withdrawal Date
29-Apr-2002
ICS
49.080 - Aerospace fluid systems and components
Technical Committee
ASD-STAN - Aerospace
Drafting Committee
ASD-STAN/D 3 - Mechanical
Current Stage
9093 - Decision to confirm - Review Enquiry
Start Date
31-May-2017
Completion Date
14-Apr-2025
Ref Project
SIST EN 4188:2004 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90° bulkhead, long, welded end

Overview

EN 4188:2001 defines the characteristics of 90° long welded bulkhead elbows in titanium alloy designed for pipe couplings with an 8°30' profile for aerospace applications. The standard sets requirements for configuration, materials, surface treatment, internal finish, marking and technical acceptance for components rated up to 28 000 kPa and suitable for service between -55 °C and 135 °C.

This specification is intended for designers, manufacturers and quality engineers who work with aerospace fluid systems and need interoperable, high‑performance bulkhead elbow fittings in titanium alloy.

Key Topics

  • Scope and limits: Applies to 90° bulkhead elbows, welded end, long design for 8°30' pipe couplings. Nominal pressure up to 28 000 kPa; temperature range -55 °C to 135 °C.
  • Configuration and dimensions: Dimensional and mass data are defined by figure 1 and table 1 of the standard; unspecified dimensions may be at the manufacturer's option provided EN 3275 type II qualification and acceptance are met.
  • Materials: Titanium alloy grades referenced by the standard (see EN 3311–EN 3315 for alloy and product form requirements).
  • Surface treatment and lubrication: Welded end is supplied without surface treatment for a minimum 10 mm on outside and bore. Threads and sealing faces require lubrication per EN 2491 after abrasive blasting with non‑metallic grit; lubricant film thickness specified between 0,005 mm and 0,013 mm.
  • Internal finish: Internal radius R shall be 0,3 mm to 1,0 mm with a surface roughness target of 0,8 µm. Hand deburring is prohibited.
  • Marking and identification: Marking follows EN 2424 (style A) and the standard's figure 1 conventions.

Applications

  • Aircraft and spacecraft fluid distribution systems requiring lightweight, corrosion‑resistant titanium fittings.
  • High‑pressure hydraulic and pneumatic bulkhead penetrations using the aerospace 8°30' coupling series.
  • Replacement and qualification of long welded end bulkhead elbows in legacy and new aerospace platforms where standardised dimensions and traceability are required.

Benefits include consistent fit and interchangeability, material suitability for aerospace environments (weight and corrosion resistance), and defined acceptance criteria to support procurement and quality assurance.

Related Standards

EN 4188:2001 references and aligns with other aerospace standards used for implementation and inspection, including:

  • ISO 5855-3 (MJ thread limit dimensions for fittings)
  • EN 2424 (marking of aerospace products)
  • EN 2491 (molybdenum disulphide dry lubricants)
  • EN 2656 (pipe coupling pressure classification)
  • EN 3267 / EN 3275 (washers and coupling geometric/configuration details)
  • EN 3311–EN 3315 (titanium alloy material specifications)

For procurement, installation and testing, consult EN 4188:2001 together with the listed normative references and the figures/tables contained in the standard for exact dimensional and acceptance criteria.

Frequently Asked Questions

EN 4188:2001 is a standard published by the European Committee for Standardization (CEN). Its full title is "Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90° bulkhead, long, welded end". This standard covers: This standard specifies the characteristics of elbows 90°, bulkhead, welded end, long, 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

This standard specifies the characteristics of elbows 90°, bulkhead, welded end, long, 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

EN 4188:2001 is classified under the following ICS (International Classification for Standards) categories: 49.080 - Aerospace fluid systems and components. The ICS classification helps identify the subject area and facilitates finding related standards.

EN 4188:2001 is available in PDF format for immediate download after purchase. The document can be added to your cart and obtained through the secure checkout process. Digital delivery ensures instant access to the complete standard document.

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° bulkhead, long, welded endLuft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Winkel-Schottverschraubungen 90° mit Anschweißende lange AusführungSérie aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords coudés a 90° pour traversée de cloison, type long a souderAerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90° bulkhead, long, welded end49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4188:2001SIST EN 4188:2004en01-maj-2004SIST EN 4188:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4188October 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' in titanium alloy - Elbows90° bulkhead, long, welded endSérie aérospatiale - Système de raccordement 8°30' enalliage de titane - Raccords coudés à 90° pour traversée decloison, type long à souderLuft- und Raumfahrt - Rohrverschraubung 8°30' ausTitanlegierung - Winkel-Schottverschraubungen 90° mitAnschweißende lange AusführungThis European Standard was approved by CEN on 28 February 2001.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 4188:2001 ESIST EN 4188:2004

ScopeThis standard specifies the characteristics of elbows 90°, bulkhead, welded end, long, for pipe couplings 8°30', in titaniumalloy, for aerospace applications. Nominal pressure: up to 28 000 kPaTemperature range:
55 °C to 135 °C2
Normative referencesThis European Standard incorporates by dated or undated reference provisions from other publications. These normativereferences are cited at the appropriate places in the text and the publications are li
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