SIST EN 4029:2002

• Abstract:

  This standard specifies the characteristics of tees, bulkhead branch, 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: 31-Dec-2001
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: SS SPL - Technical Board for the general field
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 01-Jan-2002
• Due Date: 01-Jan-2002
• Completion Date: 01-Jan-2002
• Ref Project: EN 4029:2001 - Aerospace series - Pipe coupling 8°30' in titanium alloy - Tees bulkhead branch

• Refers: SIST EN 3274:2011 - Aerospace series - Pipe coupling 8°30' - Thread end - 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: oSIST prEN 415-2:2022 - Safety of packaging machines - Part 2: Packaging machines for pre-formed rigid containers
• Effective Date: 28-Jan-2026
• Refers: SIST EN 2491:2011 - Aerospace series - Molybdenum disulphide dry lubricants - Coating methods
• 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 3267:2004 - Aerospace series - Washers, bulkhead, in titanium alloy
• 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 4029:2002 is the Slovenian standard identical to EN 4029:2001. It specifies titanium-alloy tees, bulkhead branch, for 8°30' pipe couplings used in aerospace applications, with nominal pressure up to 28 000 kPa and a temperature range from 55 °C to 135 °C.

What does SIST EN 4029:2002 specify?

SIST EN 4029:2002 specifies the characteristics of tees, bulkhead branch, for pipe couplings 8°30' in titanium alloy. In practice, it is the product standard for selecting, making, marking and installing this fitting in aerospace fluid systems.

The document is organized into:

• Clause 1 - scope
• Clause 2 - normative references
• Clause 3 - required characteristics
• Clause 4 - designation
• Clause 5 - marking
• Clause 6 - technical specification
• Clause 7 - installation details

Figure 1 and Table 1 give the dimensional definition and mass data, and Figure 2 gives the installation arrangement.

What are the key requirements of SIST EN 4029:2002?

SIST EN 4029:2002 focuses on dimensions, materials, surface condition, marking and installation compatibility. The main point is that the tee must fit the 8°30' coupling system and meet the related qualification and acceptance rules.

• Clause 3.1 - configuration, dimensions and mass: the part geometry and mass are given by Figure 1 and Table 1, and the values apply before lubrication. Any dimension not specified in the standard is left to the manufacturer, but only if the qualification and acceptance requirements of EN 3275 type II are met. In practice, that means the fitting can vary only within a controlled, system-qualified envelope.
• Clause 3.2 - surface roughness: the surface finish follows Figure 1 unless the design documentation says otherwise. This matters because sealing and assembly performance depend on a controlled finish.
• Clause 3.3 - materials: the tee is made from the titanium alloy product forms listed in EN 3311, EN 3314, EN 3312 or EN 3315. This tells the buyer and manufacturer which approved stock or forgings may be used.
• Clause 3.4 - surface treatment: threads and sealing faces are lubricated according to EN 2491, after abrasive blasting with non-metallic grit. The lubricant film thickness is controlled within a narrow range. In practice, this supports consistent assembly and sealing behavior.
• Clause 3.5 - internal surface finishing: the internal finish must have a specified radius and roughness, and hand deburring is not allowed. This reduces the risk of damage, flow disturbance or local stress from uncontrolled finishing.
• Clauses 4 to 6 - designation, marking and technical specification: the part designation can include code I9005 when needed, marking follows EN 2424 style A, and the technical specification is EN 3275 type II. These clauses are what production, purchasing and inspection use to identify the part and verify it against the correct aerospace specification.
• Clause 7 - installation details: the installation arrangement is shown in Figure 2 and uses a washer according to EN 3267. This helps ensure the tee is fitted with the right associated hardware and engagement length.

What terms does SIST EN 4029:2002 define?

• Bulkhead branch - A tee branch intended for mounting through a bulkhead or partition in the aircraft structure.
• 8°30' pipe coupling - The coupling system used with this tee, identified by the 8°30' geometry.
• MJ threads - The metric aerospace thread form used for the fittings covered by this standard.
• Dynamic beam seal - The sealing arrangement named in EN 3275 for this coupling system.
• TI-P64001 - The titanium alloy used in the referenced bar and forging product forms.
• Style A marking - The marking format required by EN 2424 for this aerospace product.

Who uses SIST EN 4029:2002?

SIST EN 4029:2002 is used by aerospace manufacturers, component suppliers, inspection teams and buyers who work with titanium pipe couplings. Engineers use it for design and interface control, production teams use it for machining and finishing, quality teams use it for verification, and procurement uses it to specify the exact fitting to order.

It is most relevant where pipework must pass through a bulkhead and maintain defined pressure, temperature and installation characteristics.

Which standards are used with SIST EN 4029:2002?

Standard	What it contributes
ISO 5855-3	Limit dimensions for MJ threads for fluid-system fittings
EN 2424	Marking of aerospace products
EN 2491	Molybdenum disulphide dry-lubricant coating methods
EN 3267	Bulkhead washers in titanium alloy
EN 3274	Geometric configuration of 8°30' pipe-coupling thread ends
EN 3275	Technical specification for 8°30' pipe coupling up to 28 000 kPa, including dynamic beam seal and type II qualification and acceptance
EN 3311 / EN 3314	Titanium alloy TI-P64001 bars for machining
EN 3312 / EN 3315	Titanium alloy TI-P64001 forgings

What does the SIST EN 4029:2002 document contain?

SIST EN 4029:2002 contains a dimensioned product definition, a size and mass table, and an installation sketch. The figures show the part geometry, the marking area and the bulkhead installation arrangement.

It also gives the material options, surface treatment requirements, marking rules and the link to EN 3275 type II for technical acceptance. For engineers and inspectors, that means the standard is a compact product definition plus the related documents needed to make and check the fitting correctly.

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling 8-30' in titanium alloy - Tees bulkhead branchLuft- und Raumfahrt - Rohrverschraubung 8°30' aus Titanlegierung - T-Verschraubungenseitlicher Auslass als SchottanschlussSérie aérospatiale - Systeme de raccordement 8°30' en alliage de titane - Raccords en té pour traversée de cloison en piedAerospace series - Pipe coupling 8°30' in titanium alloy - Tees bulkhead branch49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 4029:2001SIST EN 4029:2002en01-januar-2002SIST EN 4029:2002SLOVENSKI
STANDARD
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 4029September 2001ICS 49.080English versionAerospace series - Pipe coupling 8°30' in titanium alloy - Teesbulkhead branchSérie aérospatiale - Système de raccordement 8°30' enalliage de titane - Raccords en té pour traversée de cloisonen piedLuft- und Raumfahrt - Rohrverschraubung 8°30' ausTitanlegierung - T-Verschraubungen seitlicher Auslaß alsSchottanschlußThis 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 4029:2001 ESIST EN 4029:2002

ScopeThis standard specifies the characteristics of tees, bulkhead branch, for pipe couplings 8°30', in titanium alloy, foraerospace applications.Nominal pressure: up to 28 000 kPaTemperature range:
55 °C t
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