EN 3718:2012

Aerospace series - Test method for metallic materials - Ultrasonic inspection of tubes

This European Standard specifies the requirements for ultrasonic inspection of tubes in metallic materials with an external diameter  5 mm.
For other cases, the use of this standard is by agreement between the manufacturer and the purchaser.
The purpose of the ultrasonic inspection is the detection of defects within the wall thickness and at the outer and inner surfaces of the tube. The method will detect two dimensional defects in the longitudinal and circumferential directions perpendicular to the tube wall. Where inspection for other types of defects is required, this requirements shall be stated on the order.

Luft- und Raumfahrt - Prüfverfahren für metallische Werkstoffe - Ultraschallprüfung von Rohren

Diese Europäische Norm legt die Anforderungen an die Ultraschallprüfung von Rohren aus metallischen Werkstoffen mit einem Außendurchmesser  5 mm fest.
In anderen Fällen kann diese Norm nach Absprache zwischen Hersteller und Käufer verwendet werden.
Die Ultraschallprüfung dient dazu, Fehler innerhalb der Wanddicke und an den Außen- und Innenflächen der Rohre zu erkennen. Mit dem Verfahren werden zweidimensionale Fehler in Längsrichtung und in Richtung des Umfangs senkrecht zur Rohrwandung erkannt. Wenn eine Prüfung auf andere Fehler erfolgen soll, sollten diese Anforderungen in der Auftragsdokumentation festgehalten werden.

Série aérospatiale - Méthode d'essai applicable aux matériaux métalliques - Contrôle par ultrasons des tubes

La présente Norme européenne spécifie les exigences relatives aux contrôles par ultrasons des tubes en matériaux métalliques de diamètre extérieur  5 mm.
Pour les autres cas, l’utilisation de la présente norme est soumise à l’accord du fabricant et du client.
Le but du contrôle par ultrasons est de détecter les défauts dans l’épaisseur de la paroi et dans les surfaces extérieure et intérieure du tube. La méthode détectera deux défauts dimensionnels dans les directions longitudinale et circonférentielle, perpendiculaires à la paroi du tube. Lorsque des contrôles pour d’autres types de défauts sont exigés, il convient que ces exigences soient indiquées sur la commande.

Aeronavtika - Preskuševalna metoda za kovinske materiale - Ultrazvočno preiskovanje cevi

Ta evropski standard določa zahteve za ultrazvočno preiskovanje cevi pri kovinskih materialih z zunanjim premerom ≥ 5 mm. V drugih primerih se ta standard uporablja po dogovoru med proizvajalcem in kupcem. Namen ultrazvočnega preiskovanja je odkrivanje napak v debelini stene ter na zunanji in notranji površini cevi. Z metodo se bosta preiskali dve dimenzijski napaki v vzdolžni in obodni smeri pravokotno na steno cevi. Kadar je potrebna preiskava drugih vrst napak, naj bi se te zahteve navedle na naročilu.

General Information

• Status: Published
• Publication Date: 20-Mar-2012
• Withdrawal Date: 29-Sep-2012
• ICS: 49.030.60 - Rivets
• Technical Committee: ASD-STAN - Aerospace
• Drafting Committee: ASD-STAN/D 4 - Metallic
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 21-Mar-2012
• Completion Date: 21-Mar-2012
• Ref Project: SIST EN 3718:2012 - Aerospace series - Test method for metallic materials - Ultrasonic inspection of tubes

Overview

EN 3718:2012 - Aerospace series (CEN) specifies a standardized ultrasonic inspection method for metallic tubes used in aerospace applications. The standard applies to tubes with an external diameter ≥ 5 mm (other sizes by agreement between manufacturer and purchaser). Its purpose is the reliable detection of defects within the tube wall and at inner and outer surfaces, focusing on two‑dimensional defects oriented in the longitudinal and circumferential directions perpendicular to the tube wall.

Key topics and technical requirements

• Scope and defects detected: Detects internal, inner-surface and outer-surface defects and 2D flaws in longitudinal and circumferential directions. Other defect types must be specified on the order.
• Equipment: Pulse‑echo ultrasonic test equipment with appropriate output, recording and gating capability; recommended spherical or cylindrical focused probes for oblique incidence.
• Calibration and reference specimens: Use calibration blocks per ISO 7963 and a reference specimen made from the same material and geometry as production tubes. Reference specimen includes four notches (longitudinal/circumferential, inner/outer) with controlled dimensions and tolerances.
• Coupling and probes: Liquid couplants (water, oil, glycerine) or immersion/squirter techniques; avoid bubbles. Probe arrangement may be oblique on both sides or single‑side with a second run.
• Manipulation and scanning: Automated manipulator for helical/rotational motion; scan pitch and speed must ensure at least two return signals from reference notches (two signals ≤ 6 dB down from notch maximum).
• Sensitivity and evaluation: Required signal‑to‑noise ratio for reference notch indications (minimum 12 dB), time separation from other signals, reproducibility (plots/C‑scans). Indications ≥ 50 % (6 dB) of the reference notch maximum are marked; contiguous circumferential scans trigger classification as defective.
• Preparation and limits: Surfaces must be clean; mean Ra ≤ 2.5 µm; inner surface dry and tubes plugged. For wall thickness < 1.5 mm the focus shall be in the tube wall.
• Personnel and documentation: Qualification per EN 4179; inspection schedules and reports per EN 2078.

Applications and who uses this standard

• Aerospace manufacturers and component suppliers for tubing used in structural, hydraulic or pneumatic systems
• NDT (non‑destructive testing) engineers and quality control laboratories validating tube integrity
• Procurement and acceptance testing teams specifying inspection requirements in purchase orders
• Fitness‑for‑service and maintenance organizations performing systematic tube inspections

EN 3718:2012 helps ensure repeatable, documented ultrasonic tube inspections that support product safety, traceability and contractual acceptance.

Related standards

• EN 4050‑1 (ultrasonic inspection of bars, plates, forgings)
• EN 4179 (qualification and approval of NDT personnel)
• ISO 7963 (calibration block No. 2)
• EN 2078 (inspection and test schedules / reports)

Keywords: EN 3718:2012, ultrasonic inspection of tubes, aerospace series, ultrasonic testing, C‑scans, calibration block, reference specimen, NDT.

Standards Content (Sample)

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.YRþQRLuft- und Raumfahrt - Prüfverfahren für metallische Werkstoffe - Ultraschallprüfung von RohrenSérie aérospatiale - Méthode d'essai applicable aux matériaux métalliques - Contrôle par ultrasons des tubesAerospace series - Test method for metallic materials - Ultrasonic inspection of tubes49.035Sestavni deli za letalsko in vesoljsko gradnjoComponents for aerospace construction49.025.01Materiali za letalsko in vesoljsko gradnjo na splošnoMaterials for aerospace construction in generalICS:Ta slovenski standard je istoveten z:EN 3718:2012SIST EN 3718:2012en,de01-september-2012SIST EN 3718:2012SLOVENSKI
STANDARD
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 3718
March 2012 ICS 49.030.60 English Version
Aerospace series - Test method for metallic materials - Ultrasonic inspection of tubes
Série aérospatiale - Méthode d'essai applicable aux matériaux métalliques - Contrôle par ultrasons des tubes
Luft- und Raumfahrt - Prüfverfahren für metallische Werkstoffe - Ultraschallprüfung von Rohren This European Standard was approved by CEN on 21 January 2011.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC 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 translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,
B-1000 Brussels © 2012 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 3718:2012: ESIST EN 3718:2012

EN 4179, Aerospace series — Qualification and approval of personnel for non-destructive testing ISO 7963, Non-destructive testing — Ultrasonic testing — Specification for calibration block No. 2 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 4050-1 apply. 4 Short description of the procedure The inspection shall be carried out using ultrasonic test equipment, which emits ultrasonic signals passing through a liquid coupling medium obliquely into the tube under test and which receives and evaluates the reflected (or transmitted) signals. The tubes shall be inspected automatically and completely i.e. the relative movement of probe and tube under test shall be accomplished with the aid of a manipulator. The corresponding signal amplitudes from the ultrasonic test equipment shall be plotted as a function of the location, e.g. amplitude scans or C-scans. 5 Equipment requirements 5.1 Calibration blocks Calibration blocks as per ISO 7963 or equivalent standards shall be used to check the proper function and characteristics of the ultrasonic test unit and probes. The method of checking the equipment and requirements concerning the calibration blocks shall be agreed between the manufacturer and the purchaser.
1) Published as ASD-STAN Prestandard at the date of publication of this standard (www.asd-stan.org). SIST EN 3718:2012

A-A B.B C-C D-D
Longitudinal defects Longitudinal defects Circumferential defects Circumferential defects
2 a212dR
t RR =+=
2 i212dr
t rr =+= t = Depth b = Widht L = Length di = Internal diameter da = External diameter P ≥ 20 mm Figure 1 — Reference specimen with four notches in longitudinal and circumferential direction on the inner and outer surface of the tube wall SIST EN 3718:2012

6,0 0,10 a a is wall thickness in millimetres.
The reference notches shall be rectangular for notches in the longitudinal direction and shall have the shape of a ring segment in the circumferential direction and edge radii ≤ 0,13 mm. The depth of the notch shall correspond to a mean value, measured from the tube surface to the respective penetration depth of the notch. Notch dimensions shall comply with the values specified in Table 1 to within ± 15 %. The notch depth shall be measured from the circular surface to the deepest penetration of the notch. Measurements may be made by replication or by a destructive method on a duplicate notch which has identical ultrasonic response (amplitude within 90 % to 110 % of the reference notch amplitude). In order to have access to notches lying inside the reference specimen, a window may be cut into the opposite tube wall to provide access to the notch. The window shall not be so large as to interfere with the ultrasonic responses from the notch. Each reference specimen shall be identified. The
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