SIST EN 10246-7:2005

SLOVENSKI STANDARD
SIST EN 10246-7:2005
01-december-2005
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Non-destructive testing of steel tubes - Part 7: Automatic full peripheral ultrasonic testing
of seamless and welded (except submerged arc welded) tubes for the detection of
longitudinal imperfections
Zerstörungsfreie Prüfung von Stahlrohren - Teil 7: Automatische Ultraschallprüfung
nahtloser und geschweißter (ausgenommen unterpulvergeschweißter) Stahlrohre über
den gesamten Rohrumfang zum Nachweis von Längsfehlern
Essais non destructifs des tubes en acier - Partie 7 : Contrôle automatique par ultrasons
sur toute la circonférence des tubes en acier sans soudure et soudés (sauf a l'arc
immergé sous flux en poudre) pour la détection des imperfections longitudinales
Ta slovenski standard je istoveten z: EN 10246-7:2005
ICS:
23.040.10 Železne in jeklene cevi Iron and steel pipes
77.040.20 Neporušitveno preskušanje Non-destructive testing of
kovin metals
SIST EN 10246-7:2005 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 10246-7:2005

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SIST EN 10246-7:2005
EUROPEAN STANDARD
EN 10246-7
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2005
ICS 23.040.10; 77.040.20 Supersedes EN 10246-7:1996
English Version
Non-destructive testing of steel tubes - Part 7: Automatic full
peripheral ultrasonic testing of seamless and welded (except
submerged arc welded) tubes for the detection of longitudinal
imperfections
Essais non destructifs des tubes en acier - Partie 7 : Zerstörungsfreie Prüfung von Stahlrohren - Teil 7:
Contrôle automatique par ultrasons sur toute la Automatische Ultraschallprüfung nahtloser und
circonférence des tubes en acier sans soudure et soudés geschweißter (ausgenommen unterpulvergeschweißter)
(sauf à l'arc immergé sous flux en poudre) pour la détection Stahlrohre über den gesamten Rohrumfang zum Nachweis
des imperfections longitudinales von Längsfehlern
This European Standard was approved by CEN on 26 August 2005.
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 Central Secretariat 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 Central Secretariat has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,
Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,
Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2005 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 10246-7:2005: E
worldwide for CEN national Members.

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SIST EN 10246-7:2005
EN 10246-7:2005 (E)
Contents
Foreword .3
1 Scope .4
2 General requirements .4
3 Method of test .4
4 Reference standards.5
4.1 General .5
4.2 Types of reference notches.5
4.3 Dimensions of reference notches.6
4.4 Verification .7
5 Equipment calibration and checking.7
6 Acceptance.7
7 Test reporting.8
Annex A 9
(informative).9
Parts of EN 10246 and corresponding ISO standards .9
Annex B 10
(normative) 10
Testing of tubes having an outside diameter-to-thickness ratio less than 5 .10
Annex C 11
(normative) 11
Manual/semi-automatic ultrasonic testing of untested ends/suspect areas.11

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SIST EN 10246-7:2005
EN 10246-7:2005 (E)
Foreword
This European Standard (EN 10246-7:2005) has been prepared by Technical Committee ECISS/TC 29 “Steel
tubes and fittings for steel tubes”, the secretariat of which is held by UNI.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by April 2006, and conflicting national standards shall be withdrawn at the latest by
April 2006.
This European Standard supersedes EN 10246-7:1996.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark,
Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta,
Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
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SIST EN 10246-7:2005
EN 10246-7:2005 (E)
1 Scope
This part of EN 10246 specifies the requirements for automatic full peripheral ultrasonic shear wave (including
phased array technique) and Lamb wave testing of seamless and welded steel tubes, with the exception of
submerged arc-weld (SAW) tubes, for the detection of longitudinal imperfections. This European Standard specifies
acceptance levels and calibration procedures.
This part of EN 10246 is applicable to the inspection of tubes with an outside diameter > 10 mm, and with an
outside diameter-to-thickness ratio ≥ 5.
For tubes with an outside diameter-to-thickness ratio < 5, one of the options specified in Annex B shall be used by
agreement between purchaser and manufacturer.
The European Standard EN 10246 ”Non-destructive testing of steel tubes" comprises the parts shown in Annex A.
2 General requirements
2.1 The ultrasonic inspection covered by this Part of EN 10246 is usually carried out on tubes after completion of
all the primary production process operations.
The inspection shall be carried out by suitably trained, qualified and competent personnel approved by the
manufacturer.
2.2 The tubes to be tested shall be sufficiently straight to ensure the validity of the test. The surfaces shall be
sufficiently free from foreign matter, which could interfere with the validity of the test.
3 Method of test
3.1 The tubes shall be tested using an ultrasonic shear wave or Lamb wave technique for the detection of
predominantly longitudinal imperfections.
3.2 During testing, the tubes and the transducer assembly shall be moved relative to each other so that the
whole of the tube length is scanned.
It is recognised that there may be a short length at both tube ends which cannot be tested. Any untested ends shall
be dealt with in accordance with the requirements of the appropriate product standards (see also Annex C).
The relative speed of movement during testing shall not vary by more than ± 10%.
3.3 During testing, the tubes shall be scanned in two opposing circumferential directions of beam travel, unless
otherwise agreed between purchaser and manufacturer.
3.4 The ultrasonic test frequency to be applied shall be in the range of 1 MHz to 15 MHz for shear wave
technique and in the range of 0,3 MHz to 1 MHz for Lamb waves, depending upon the thickness and surface finish
of the tube to be tested.
3.5 The maximum width of each individual transducer, measured parallel to the major axis of the tube, shall be
25 mm for shear waves and 35 mm for Lamb waves.
For U1 and U2 category tubes with an outside diameter equal to or less than 50mm, the width of any one shear
wave transducer is normally restricted to a maximum of 12,5 mm (see also 4.3).
3.6 The equipment shall be capable of classifying tubes as either acceptable or suspect tubes by means of an
automatic trigger/alarm level combined with a marking and/ or sorting system.
3.7 Where manual ultrasonic testing of untested tube ends and/or local suspect areas is required, this shall be
carried out in accordance with Annex C.
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SIST EN 10246-7:2005
EN 10246-7:2005 (E)
4 Reference standards
4.1 General
4.1.1 The reference standards defined in this Part of EN 10246 are convenient for the calibration of non-
destructive testing equipment. The dimensions of the reference notches should not be construed as the minimum
size of imperfection detectable by such equipment.
4.1.2 The ultrasonic equipment shall be calibrated using a longitudinal reference notch on the outside and
inside surfaces of a reference tube.
However, the internal notch shall not be used when the tube internal diameter is less than 20 mm, unless otherwise
agreed between purchaser and manufacturer.
4.1.3 The reference tube shall have the same specified diameter, thickness, surface finish and heat treatment
conditions as the tube to be tested, and shall have similar acoustic properties (for example velocity, attenuation
coefficient).
4.1.4 In order to obtain clearly distinguishable signal indications, the notch(es) shall be sufficiently separated
from the ends of the reference tube and, when both notches are used, from each other.
4.2 Types of reference notches
4.2.1 The reference notch or notches shall lie parallel to the major axis of the reference tube.
The reference notch or notches shall be of the "N" type except that the "V" type notch may be used at the discretion
of the manufacturer when the specified notch depth is less than or equal to 0,5 mm (see figure 1). In the case of the
"N" type notch, the sides shall be nominally parallel and the bottom shall be nominally square to the sides.

a) "V" type notch (only to be used when d ≤ 0,5 mm)  b) ”N” type notch
Key
w = width
d = depth
α = 60°
Figure 1 - Reference notch forms
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SIST EN 10246-7:2005
EN 10246-7:2005 (E)
4.2.2 The reference notch shall be formed by machining, spark erosion or other methods.
NOTE It is recognised that the bottom or the bottom corners of the notch may be rounded.
4.3 Dimensions of reference notches
4.3.1 Width, w (see figure 1)
The width of the reference notch shall not be greater than 1,0 mm.
4.3.2 Depth, d (see figure 1)
The depth of the reference notch shall be as given in table 1.
Table 1 — Acceptance level design and corresponding reference notch depth

Notch depth in % of the specified
Acceptance level
a
thickness
b
3
U1
c
5
U2
U3 10
U4 12,5
U5 15
U6 20
a The values of notch depth specified in this table are the same, for the corresponding categories, in
all European Standards concerning non-destructive testing of steel tubes where reference is made to
different acceptance levels. It should, however, be kept in mind that although the reference
standards are identical, the various test methods involved can give different test results. Accordingly
the acceptance level designation prefix U (ultrasonic) has been adopted to avoid any inferred direct
equivalence with other test methods.
b
Acceptance level U1 is not applicable to as-welded or hot stretch reduced welded tubes.
c
For welded tubes, acceptance level U2 can be used as an alternative to or in combination with U3 by
agreement between purchaser and manufacturer.

4.3.2.1 The minimum notch depth is related to the type of tube used for a particu
...