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1、BRITISH STANDARD BS EN 10246-7:1996 Non-destructive testing of steel tubes Part 7: Automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections The European Standard EN 10246-7:1996 has the status of a B
2、ritish Standard ICS 23.040.10 BS EN 10246-7:1996 This British Standard, having been prepared under the direction of the Engineering Sector Board, was published under the authority of the Standards Board and comes into effect on 15 July 1996 BSI 02-1999 The following BSI references relate to the work
3、 on this standard: Committee reference ISE/73 Draft for comment 91/37479 DC ISBN 0 580 25876 9 Committees responsible for this British Standard The preparation of this British Standard was entrusted to Technical Committee ISE/73, Steels for pressure purposes, upon which the following bodies were rep
4、resented: Associated Offices Technical Committee BEAMA Ltd. British Compressed Air Society British Forging Industry Association British Gas plc British Steel Industry Electricity Supply Industry in England and Wales Engineering Equipment and Materials Users Association Lloyds Register of Shipping Po
5、wer Generation Contractors Association (BEAMA Ltd.) Process Plant Association The Welding Institute Co-opted members The following bodies were also represented in the drafting of the standard, through subcommittees and panels: British Fluid Power Association British Gas British Stainless Steel Assoc
6、iation British Welded Steel Tube Association Confederation of British Industry Electricity Association Energy Industries Council Seamless Steel Tube Association Amendments issued since publication Amd. No.DateComments BS EN 10246-7:1996 BSI 02-1999i Contents Page Committees responsibleInside front c
7、over National forewordii Foreword2 Text of EN 10246-73 BS EN 10246-7:1996 ii BSI 02-1999 National foreword This British Standard has been prepared by Technical Committee ISE/73 and is the English language version of EN 10246-7:1996, published by the European Committee for Standardization (CEN). This
8、 British Standard contains elements of BS 3889 Non-destructive testing of pipes and tubes Part 1:1983 Methods of automatic ultrasonic testing for the detection of imperfections in wrought steel tubes. A complete list of the Parts of EN 10246 is given in Annex A of this standard. When all relevant Pa
9、rts have been published, BS 3889-1:1983 will be withdrawn. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from l
10、egal obligations. Summary of pages This document comprises a front cover, an inside front cover, pages i and ii, the EN title page, pages 2 to 9 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment tab
11、le on the inside front cover. EUROPEAN STANDARD NORME EUROPENNE EUROPISCHE NORM EN 10246-7 March 1996 ICS 23.040.10 Descriptors: Metal tubes, steel tubes, welded tubes, seamless tubes, non-destructive tubes, ultrasonic tests, inspection, leak-tightness English version Non-destructive testing of stee
12、l tubes Part 7: Automatic full peripheral ultrasonic testing of seamless and welded (except submerged arc welded) steel tubes for the detection of longitudinal imperfections Essais non destructifs des tubes en acier Partie 7: Contrle automatique par ultrasons sur toute la circonfrence pour la dtecti
13、on des imperfections longitudinales des tubes en acier sans soudure et souds (sauf larc immerg sous flux en poudre) Zerstrungsfreie Prfung von Stahlrohren Teil 7: Automatische Ultraschallprfung nahtloser und geschweiter (ausgenommen unterpulvergeschweiter) Stahlrohre ber den gesamten Rohrumfang zum
14、Nachweis von Lngsfehlern This European Standard was approved by CEN on 1995-12-28. 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
15、 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 responsibil
16、ity 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, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Port
17、ugal, Spain, Sweden, Switzerland and United Kingdom. CEN European Committee for Standardization Comit Europen de Normalisation Europisches Komitee fr Normung Central Secretariat: rue de Stassart 36, B-1050 Brussels 1996 Copyright reserved to CEN members Ref. No. EN 10246-7:1996 E EN 10246-7:1996 BSI
18、 02-1999 2 Foreword This European Standard 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 b
19、y endorsement, at the latest by September 1996, and conflicting standards shall be withdrawn at the latest by September 1996. According to the CEN/CENELEC Internal Regulations, the following countries are bound to implement this European Standard: Austria, Belgium, Denmark, Finland, France, Germany,
20、 Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom. Contents Page Foreword2 1Scope3 2General requirements3 3Method of test3 4Reference standards3 5Dimensions of reference notches4 6Equipment calibration and checking5 7Acceptance
21、5 8Test reporting6 Annex A (informative) Table of Parts of EN 10246 Non-destructive testing of steel tubes7 Annex B (normative) Testing of tubes having an outside diameter-to-thickness ratio less than five8 Annex C (normative) Manual ultrasonic testing of untested ends/suspect areas8 Figure 1 Refere
22、nce notch forms4 Figure B.1 Mode transformed compression wave adaptation of shear wave testing8 Table 1 Acceptance level designation and corresponding reference notch depth4 Table 2 Minimum notch depth categories4 Table B.1 Ratios8 EN 10246-7:1996 BSI 02-19993 1 Scope This Part of EN 10246 specifies
23、 the requirements for automatic full peripheral ultrasonic shear wave testing of seamless and welded steel tubes, with the exception of submerged arc-weld (SAW) tubes, for the detection of longitudinal imperfections according to six different acceptance levels (see Table 1 and associated notes). Thi
24、s Part of EN 10246 is applicable to the inspection of tubes with an outside diameter greater than 10 mm, and with an outside diameter-to-thickness ratio equal to or greater than five. For tubes with an outside diameter-to-thickness ratio less than five, one of the options specified in Annex B shall
25、be used by agreement between purchaser and manufacturer. 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 a
26、ll the primary production process operations. This inspection shall be carried out by suitably trained, qualified and competent NDT 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
27、 free from foreign matter which would interfere with the validity of the test. 3 Method of test 3.1 The tubes shall be tested using an ultrasonic shear wave technique for the detection of predominantly longitudinal imperfections. 3.2 During testing, the tubes and the transducer assembly shall be mov
28、ed relative to each other so that the whole of the tube surface is scanned. The chosen relative speed of movement during testing shall not vary by more than 10 %. NOTEIt is recognized that there may be a short length at both tube ends which cannot be tested. Any untested ends shall be dealt with in
29、accordance with the requirements of the appropriate product standards (see also Annex C). 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 appl
30、ied shall be in the range of 1 MHz to 15 MHz dependent 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 U1 and U2 category tubes with an outside diameter equal to
31、or less than 50 mm, the width of any one transducer is normally restricted to a maximum of 12,5 mm (see also 5.3). 3.6 The equipment shall be capable of classifying tubes as either acceptable or suspect by means of an automatic trigger/alarm combined with a marking and/or sorting system. 3.7 Where m
32、anual ultrasonic testing of untested tube ends and/or local suspect areas is required, this shall be carried out in accordance with Annex C. 4 Reference standards 4.1 The reference standards defined in this Part of EN 10246 are convenient standards for the calibration of non-destructive testing equi
33、pment. The dimensions of these standards should not be construed as the minimum size of imperfection detectable by such equipment. 4.2 The ultrasonic equipment shall be calibrated using a longitudinal reference notch on the outside and inside surfaces, or the outside surface only of a tubular test p
34、iece. The internal notch shall not be used when the tube internal diameter is less than 20 mm, unless otherwise agreed between purchaser and manufacturer. 4.3 The test piece shall have the same specified diameter, thickness, surface finish and heat treated condition as the tube to be tested, and sha
35、ll have similar acoustic properties (for example velocity, attenuation coefficient, etc). 4.4 The external and internal notches shall be sufficiently separated from the extremities of the test piece and from each other (when both are used), so that clearly distinguishable signal indications are obta
36、ined. 4.5 The reference notch or notches shall lie parallel to the major axis of the test piece. 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 (se
37、e 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. EN 10246-7:1996 4 BSI 02-1999 4.6 The reference notch shall be formed by machining, spark erosion or other methods. NOTEIt is recognized that the bottom or the
38、 bottom corners of the notch may be rounded. 5 Dimensions of reference notches The dimensions of the reference notches shall be as follows: 5.1 Width, w (see Figure 1). The width of the reference notch shall be 1,0 mm max. 5.2 Depth, d (see Figure 1). 5.2.1 Reference notch depth. The reference notch
39、 depth shall be as given in Table 1. Table 1 Acceptance level designation and corresponding reference notch depth 5.2.2 Minimum notch depth The minimum notch depth is related to the type of tube used for a particular application and is denoted by a sub-category as given in Table 2, unless otherwise
40、agreed between purchaser and manufacturer. Table 2 Minimum notch depth categories 5.2.3 Maximum notch depth The maximum notch depth for all acceptance levels and sub-categories shall be 1,5 mm, with exception that in the case of tubes with a thickness in excess of 50 mm, the maximum notch depth, may
41、 be extended to 3,0 mm unless otherwise agreed. 5.3 Tolerance on depth The tolerance on depth shall be 15 % of reference notch depth or 0,05 mm, whichever is the larger, with the exception that when the notch depth is less than 0,2 mm, the tolerance on the depth shall be 0,03 mm. Figure 1 Reference
42、notch forms Acceptance levelNotch depth in % of the specified thickness (see note 1) U1 (see note 2)3 U2 (see note 3)5 U310 U412,5 U515 U620 NOTE 1The values of notch depth specified in this table are the same, for the corresponding categories, in all European Standards concerning non-destructive te
43、sting 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)
44、has been adopted to avoid any inferred direct equivalence with other test methods. NOTE 2Acceptance level U1 is not applicable to welded tubes. NOTE 3For welded tubes, acceptance level U2 can be used as an alternative to or in combination with U3 by agreement between purchaser and manufacturer. Sub-
45、categoryMinimum notch depth Typical tube condition A0,1 mmCold-finished and machined tubes B0,2 mm C0,3 mmAll other conditions D0,5 mm NOTE 1The minimum notch depth that can be used is related to specific tube manufacturing methods where the surface finish plays a dominant role in the minimum notch
46、depth that can be adopted for ultrasonic equipment calibration in order to achieve an acceptable signal/noise ratio. NOTE 2Sub-categories A and B do not apply to welded tubes. EN 10246-7:1996 BSI 02-19995 5.4 Length The length of the reference notch or notches shall be at least twice the width of th
47、e transducers, with the following exception: for U1 and U2 category tubes with an outside diameter less than or equal to 50 mm and where the width of any one transducer exceeds 12,5 mm, the length of the reference notch or notches shall not exceed 12,5 mm (at full depth). 5.5 Verification The refere
48、nce notch dimensions and shape shall be verified by a suitable technique. 6 Equipment calibration and checking 6.1 The equipment shall be adjusted to consistently produce, (for example, from three consecutive passes of the test piece through the equipment), clearly identifiable signals from both the
49、 external and internal reference notches or from the external reference notch when this alone is used (see 4.2). These signals shall be used to set the trigger/alarm level(s) of the equipment. Where a single trigger/alarm level is used, the transducer(s) shall be adjusted so that the signals from the internal and external reference notches are as near equal as possible and the full amplitude of the lesser of the two signals shall be used to set the trigger/alarm level of the equipment. Where separate trigger/alarm levels