SIST EN 4183:2004

• Abstract:

  This standard specifies the characteristics of elbows 90 , welded ends, 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

• 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 4183:2001 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90° welded ends

• Refers: SIST EN 2656:2002 - Aerospace series - Pipe coupling - Coupling end, welded - Geometric configuration
• Effective Date: 28-Jan-2026
• Refers: SIST EN 3311:2024 - Aerospace series - Titanium alloy TI-P64001 (Ti-6Al-4V) - Annealed - Bars for machining - D ≤ 300 mm - 900 MPa ≤ Rm ≤ 1 160 MPa
• Effective Date: 28-Jan-2026
• Refers: SIST EN 3312:2012 - Aerospace series - Titanium alloy Ti-6Al-4V - Annealed - Forgings De ≤ 150 mm
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2424:2008 - Aerospace series - Marking of aerospace products
• Effective Date: 28-Jan-2026
• Refers: SIST EN 3275:2019 - Aerospace series - Pipe coupling 8°30' up to 28 000 kPa Dynamic beam seal - Metric series - Technical specification
• Effective Date: 28-Jan-2026

SIST EN 4183:2004 is a SIST aerospace standard for 90° elbows with welded ends in titanium alloy for 8°30' pipe couplings. It specifies the characteristics of these parts for aerospace applications, including their dimensions, material options, marking, and technical specification. For engineers, buyers, and quality teams, it is the reference for ordering, making, and checking this elbow type.

What does SIST EN 4183:2004 specify?

SIST EN 4183:2004 specifies 90° elbows with welded ends for pipe couplings 8°30' in titanium alloy. The scope sets the intended service window as nominal pressure up to 28 000 kPa and temperature range from -55 °C to 135 °C.

The document is organized into scope, normative references, required characteristics, designation, marking, and technical specification. Figure 1 and Table 1 give the geometry and coded sizes that users need to identify the correct elbow and verify it against the standard.

What are the key requirements of SIST EN 4183:2004?

• Clause 3.1 ties the elbow configuration, dimensions, and mass to Figure 1 and Table 1. Dimensions that are not stated there may be chosen by the manufacturer, but only if the qualification and acceptance requirements of EN 3275 type II are met. In practice, this means the standard fixes the interface dimensions, while any unstated detail still has to pass the same aerospace qualification route.

• Clause 3.2 sets surface roughness according to Figure 1 unless the design documentation says otherwise. For users, this means the finish is a controlled design characteristic, not just a shop preference.

• Clause 3.3 limits the material to the titanium alloy product forms covered by EN 3311 or EN 3314, EN 3312 or EN 3315. In practice, procurement and inspection have to trace the elbow material back to one of these listed material standards.

• Clause 3.4 requires internal surface finishing with radius R 0.3 mm to 1.0 mm and surface roughness of 0.8 µm. Hand deburring is not permitted. This matters because the internal flow surface must be repeatable and cleanly finished by a controlled process.

• Table 1 links each code to the nominal outside diameter, wall thickness, pressure classification, drill depth dimension, and across flats. This is the ordering and checking key for the part size and its pressure class.

• Clause 4 gives the designation structure and states that code I9005, when needed, is placed between the description block and the identity block. That helps keep part identification unambiguous on drawings and orders.

• Clause 5 requires marking according to EN 2424, style A and Figure 1. For users, that means the elbow needs standardized aerospace marking, not a local or informal label.

• Clause 6 points to EN 3275 type II as the technical specification. This is the companion document for the broader technical rules behind qualification and acceptance.

What terms does SIST EN 4183:2004 define?

• Nominal pressure - the pressure rating used for this elbow family, stated in the scope as up to 28 000 kPa.
• Temperature range - the service temperature window stated for these parts, from -55 °C to 135 °C.
• Code - the identifier in Table 1 that links size, wall thickness, and pressure classification.
• Across flats - the wrenching dimension across the hexagonal faces of the part.
• Drill depth dimension - the depth dimension identified in Table 1 for the drilled feature.
• Description block - the part of the designation where the standard description sits.
• Identity block - the part of the designation where the individual part identity is completed.

Who uses SIST EN 4183:2004?

SIST EN 4183:2004 is used by aerospace designers, pipe coupling manufacturers, machining suppliers, buyers, and inspectors working with fluid system components. It helps them select the correct elbow, confirm the approved titanium alloy condition, define the marking, and verify the geometry and surface finish. Quality teams use it as the basis for acceptance checks and traceability.

What changed in SIST EN 4183:2004 from the previous edition?

SIST EN 4183:2004 is stated to be identical to EN 4183:2001. The page identifies the Slovenian standard as an adoption of that European Standard.

Which standards are used with SIST EN 4183:2004?

Standard	What it contributes
EN 2424	Marking of aerospace products, used for the marking requirement in Clause 5.
EN 2656	Geometric configuration of welded coupling ends, used for the coupling-end interface and the pressure-class coding in Table 1.
EN 3275	Technical specification for pipe coupling 8°30' up to 28 000 kPa, dynamic beam seal, metric series; used for qualification and acceptance requirements.
EN 3311	Titanium alloy TI-P64001, annealed, bar for machining, D <= 150 mm.
EN 3312	Titanium alloy TI-P64001, grade 2, annealed, forgings, De <= 150 mm.
EN 3314	Titanium alloy TI-P64001, solution treated and aged, bar for machining, D <= 75 mm.
EN 3315	Titanium alloy TI-P64001, solution treated and aged, forgings, De <= 75 mm.

What does the SIST EN 4183:2004 document contain?

The document contains one figure and one main dimensions table for the elbow geometry. Figure 1 shows the shape, marking area, across-flats dimension, and the internal radius requirement, while Table 1 gives the coded sizes and related dimensions and mass.

It also contains a designation clause, a marking clause, and a technical specification clause. Those parts are used for drawings, purchasing descriptions, product marking, and acceptance against EN 3275 type II.

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° welded endsLuft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - Winkelverschraubungen 90° mit AnschweißendenSérie aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords coudés a 90° doubles, a souderAerospace series - Pipe coupling 8°30' in titanium alloy - Elbows 90° welded ends49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4183:2001SIST EN 4183:2004en01-maj-2004SIST EN 4183:2004SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4183October 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' in titanium alloy - Elbows90° welded endsSérie aérospatiale - Système de raccordement 8°30' enalliage de titane - Raccords coudés à 90° doubles, àsouderLuft- und Raumfahrt - Rohrverschraubung 8°30' ausTitanlegierung - Winkelverschraubungen 90° mitAnschweißendenThis 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 4183:2001 ESIST EN 4183:2004
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