EN 3275:2002

Aerospace series - Pipe coupling 8°30' up to 28 000 kPa - Dynamic beam seal - Metric series - Technical specification

This standard specifies the required characteristics, inspection and test methods, quality assurance and procurement
requirements for metric series 8 30' dynamic beam seal pipe couplings, for temperature ranges type II and III according
to ISO 6771 and nominal pressure up to 28 000 kPa.

Luft- und Raumfahrt - Rohrverschraubung 8°30' bis 28 000 kPa - Dichtlippe - Metrische Reihe - Technische Lieferbedingungen

Série aérospatiale - Système de raccordement 8°30' jusqu'à 28 000 kPa - Joint à lèvre - Série métrique - Spécification technique

Aerospace series - Pipe coupling 8°30' up to 28 000 kPa - Dynamic beam seal - Metric series - Technical specification

General Information

• Status: Withdrawn
• Publication Date: 16-Apr-2002
• Withdrawal Date: 30-Apr-2019
• ICS: 49.080 - Aerospace fluid systems and components
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 3 - Mechanical
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Completion Date: 01-May-2019
• Ref Project: SIST EN 3275:2004 - Aerospace series - Pipe coupling 8°30' up to 28 000 kPa - Dynamic beam seal - Metric series - Technical specification

Relations

• Replaced By: EN 3275:2019 - Aerospace series - Pipe coupling 8°30' up to 28 000 kPa Dynamic beam seal - Metric series - Technical specification
• Effective Date: 08-May-2019

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Aerospace series - Pipe coupling 8°30' up to 28 000 kPa - Dynamic beam seal - Metric series - Technical specificationLuft- und Raumfahrt - Rohrverschraubung 8°30' bis 28 000 kPa - Dichtlippe - Metrische Reihe - Technische LieferbedingungenSérie aérospatiale - Systeme de raccordement 8°30' jusqu'a 28 000 kPa - Joint a levre - Série métrique - Spécification techniqueAerospace series - Pipe coupling 8°30' up to 28 000 kPa - Dynamic beam seal - Metric series - Technical specification49.080Aerospace fluid systems and componentsICS:Ta slovenski standard je istoveten z:EN 3275:2002SIST EN 3275:2004en01-maj-2004SIST EN 3275:2004SLOVENSKI
STANDARD
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Scope42
Normative references43
Symbols54
Terms and definitions55
Requirements, inspection and test methods76
Quality assurance217
Preparation for delivery22Annex A (normative)
Production batch identification272SIST EN 3275:2004

ScopeII and III accordingto ISO 6771 and nominal pressure up to 28 000 kPa.2
Normative referencesThis European Standard incorporates by dated or undated reference provisions from other publications. Thesenormative references are cited at the appropriate places in the text and the publications are listed hereafter. Fordated references, subsequent amendments to or revisions of any of these publications apply to this EuropeanStandard only when incorporated in it by amendment or revision. For undated references, the latest edition of thepublication referred to applies (including amendments).ISO 468,
Surface roughness — Parameters, their values and general rules for specifying requirements.ISO 2685,
Aircraft — Environmental test procedure for airborne equipment — Resistance to fire in designated firezones.ISO 2859-1,
Sampling procedures for inspection by attributes — Part 1: Sampling schemes indexed by acceptancequality limit (AQL) for lot-by-lot-inspection.ISO 6771,
Aerospace — Fluid systems and components — Pressure and temperature classifications.ISO 6772,
Aerospace — Fluid systems — Impulse testing of hydraulic hose, tubing and fitting assemblies.ISO 7137,
Aircraft — Environmental conditions and test procedures for airborne equipment.ISO 7257,
Aircraft — Hydraulic tubing joints and fittings — Rotary flexure test.ISO 8625-1,
Aerospace — Fluid systems — Vocabulary — Part 1: General terms and definitions relating topressure.ISO 9538,
Aerospace — Hydraulic tubing joints and fittings — Planar flexure test.EN 2813,
Aerospace series — Aluminium alloy AL-P6061-T6 — Drawn tube for pressure applications - 0,6 mm £a £ 12,5 mm.1)EN 3042,
Aerospace series — Quality assurance — EN aerospace products — Qualification procedure.EN 3120,
Aerospace series — Titanium alloy TI-P64003 — Cold worked and stress relieved — Seamless tube forpressure systems — 4 mm £ D £ 51 mm -690 MPa
Rm
1 030 MPa.1)EN 10204,
Metallic products — Types of inspection documents.TR 2674,
Aerospace series — Design and construction of pipelines for fluids in liquid or gaseous condition — Rigidlines, installation.2)MIL-H-5606,
Hydraulic fluid, Petroleum Base, Aircraft, Missile and Ordnance.3)MIL-H-8446,
Hydraulic fluid, Nonpetroleum Base, Aircraft.3)
1) Published as AECMA Prestandard at the date of publication of this standard
2) Published as AECMA Technical Report at the date of publication of this standard
3) Published by: Department of Defense (DoD), the Pentagon, Washington, D.C. 20301.4SIST EN 3275:2004

SymbolsAElongation, in percentD0Actual outside diameter of pipe, in millimetresD1Actual inside diameter of pipe, in millimetresDNNominal outside diameter of pipePWorking pressure, in megapascalsRmTensile strength, in megapascalsRp0,20,2 % proof stress, in megapascalssxAxial stress due to pressure, in megapascals4
Terms and definitionsFor the purposes of this standard, the following terms and definitions apply:4.1
PressureNominal pressure, proof pressure, impulse pressure, burst pressure according to ISO 8625-1.4.2
Coupling4.2.1Coupling assemblyassembled and torque-tightened nut, ferrule and pipe mating with e.g. unions, tees or elbows (See figure 1)Key1Dynamic beam seal2Ferrule3Nut4Union endFigure 1 — Example of coupling assembly4.2.2Straight couplingunion connecting pipe to pipe5SIST EN 3275:2004

Surface defects4.3.1Surface irregularitynonconformity with general surface appearance, possible defect4.3.2Crackclean (crystalline) fracture passing through or across the grain boundaries that possibly follows inclusions of foreignelements. Cracks are normally caused by overstressing the metal during forging or other forming operations, orduring heat treatment. Where parts are subject to significant reheating, cracks are usually discoloured by scale4.3.3Folddoubling over of metal, which can occur during the forging operation. Folds can occur at or near the intersection ofdiameter changes and are especially prevalent with non-circular necks, shoulders and heads4.3.4Lapfold-like machining defect4.3.5Seam(1)usually a surface opening or crack resulting from a defect obtained during casting or forging(2)extraneous material, stringer in the material, which is not homogeneous with base metal4.3.6Pitvoid or hole in the surface as caused, for example, by corrosion4.4
Quality assurance4.4.1Production batcha definite quantity of some commodity or service produced at one time under conditions that are presumed uniform4.4.2Delivery batchbatch consisting of couplings with the same identity block which may come from different production batches.4.4.3Acceptable quality level (AQL)when a continuing series of lots is considered, a quality level which for the purposes of sampling inspection is thelimit of a satisfactory process average6SIST EN 3275:2004

Requirements, inspection and test methodsSee table 1 and table 2.5.1
Test conditions and preparation of specimens for qualificationTests fluids. Unless otherwise specified, tests shall be carried out using e.g. a petroleum base hydraulic fluid toMIL-H-5606 for coupling assemblies of type II temperature range and a silicate ester base hydraulic fluid toMIL-H-8446 for those of type III temperature range. Water may be used, whenever practical, for proof, burst, stresscorrosion and re-use capability testing. For other than hydraulic system applications, it is preferable to use systemfluid for leakage (gaseous pressure) and proof testing. When specified in the test method, the test fluid is used asa lubricant.Specimen preparation. Shaped parts shall be machined with the grain flow of the bar or plate in the direction ofthe fluid. Specimens shall be assembled as illustrated in table 2. Installations on the pipe end shall be in accordancewith TR 2674. Prior to testing, all couplings shall be assembled using the maximum specified torque. Except, whenspecified in table 2, the coupling shall be assembled using the minimum installation torque for at least half of thespecimens, and maximum torques for the remainder.Pipe assembly. The method of joining the pipe to the coupling end (brazing, welding, mechanical attachment, etc.)shall not be detrimental to the properties, strength or geometry of the pipe and the coupling end. The joint shall bein accordance with the design instructions and shall be inspected by direct measurement, X-ray or other non-destructive methods.7SIST EN 3275:2004

If it is desired to express thestress in terms of combined pressureand bending stress, the axial pressurestress is calculated by the formula:X10SIST EN 3275:2004
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