First edition. Non-destructive testing of steel tubes —. Part 1: Automated electromagnetic testing of seamless and welded (except. DIN EN ISO Non-destructive testing of steel tubes – Part 1: Automated electromagnetic testing of seamless and welded (except. Find the most up-to-date version of ISO at Engineering
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Automated electromagnetic testing of seamless and welded except submerged arc-welded steel tubes for the verification of hydraulic leaktightness ISO It supersedes BS EN A list of organizations represented on this committee can be obtained on request to its secretary. This publication does not purport to include all the necessary provisions of a contract. Users are responsible for its correct application. Amendments issued since publication Date Text affected www.
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publication of an identical text or by endorsement, at the latest by Octoberand conflicting national standards shall be withdrawn at the latest by October Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. This document supersedes EN Endorsement notice The text of ISO The work of preparing International Standards is normally carried out through ISO technical committees.
Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
ISO shall not be held responsible for identifying any or all such patent rights. This first edition cancels and replaces ISO ISO consists of the following parts, under the general title Non-destructive testing of steel tubes: Automated full peripheral ultrasonic thickness testing of seamless and welded except submerged arc-welded steel tubes www.
Automated electromagnetic testing of seamless and welded except submerged arc-welded steel tubes for the verification of hydraulic leaktightness 1 Scope This part of ISO specifies requirements for automated electromagnetic testing of seamless and welded steel tubes, with the exception of submerged arc-welded SAW tubes, for verification of hydraulic leaktightness. It is applicable to the inspection of tubes with an outside diameter greater than or equal to 4 mm, when testing with eddy current, and greater than 10 mm when testing with flux leakage method.
BS EN ISO 钢管的无损检测–第1部分：用于验证水压密实性的无缝和焊接钢管(埋弧焊除外)自动电磁检测 – MBA智库文档
This part of ISO can also be applicable to the testing of hollow sections. NOTE Electromagnetic inspection using magnetic flux leakage method is not applicable to austenitic stainless steel tubes. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document including any amendments applies. ISONon-destructive testing — Qualification and certification of personnel ISOSteel products — Employer’s qualification system for non-destructive testing NDT personnel 3 Terms and definitions For the purposes of this document, the terms and definitions given in ISO and the following apply.
The surfaces shall be sufficiently free of foreign matter which can interfere with the validity of the test. In the case of third-party inspection, this shall be agreed on between the purchaser and manufacturer. The operating authorization issued by the employer shall be according to a written procedure. NOTE 1 It is recognized that there can be, as in the case of hydraulic testing under normal production conditions, a short length at both tube ends which cannot be tested.
Square or rectangular tubes with a maximum dimension across the diagonal of mm may also be tested using this technique with adequately shaped coils. There is no restriction on the maximum outside diameter using these techniques. There is no restriction on the maximum outside diameter 1089-31 this technique. NOTE The pancake coils in a and b can have different forms, e.
Figure 4 — Simplified diagram of magnetic flux leakage technique for the detection of longitudinal imperfections www. NOTE The magnetic transducers can take different forms, for example absolute and differential, depending on the equipment used and other factors. The means of introducing magnetic flux in a direction parallel to the major axis of the tube can be achieved by methods other than that shown in this figure. Figure 5 — Simplified diagram of magnetic flux leakage technique for the detection of transverse imperfections 6 Reference tube 6.
The dimensions of these standards should not be construed as the minimum size of imperfection detectable by such equipment. For specified wall thickness exceeding 10 mm, the wall thickness of the reference tubes may be greater than the specified wall thickness of the pipe being inspected, provided the notch depth is calculated on the specified wall thickness of the pipe being inspected.
The manufacturer shall demonstrate, on request, the effectiveness of the adopted 1089-1. NOTE 2 In special cases, for example testing hot tubes or using equipment contained within a continuous tube mill, a modified calibration or calibration checking procedure can be used, by agreement.
Also by agreement, internal longitudinal or transverse notches can be additionally used during flux leakage inspection of pipes having wall thickness lower than 1083-1 mm. Each segment coil shall be checked with the reference tube, and the three holes shall be displaced as follows: These operations shall be repeated for each segment coil.
In this case, the manufacturer shall demonstrate that the test 100893-1 achieved using the reference hole and the equipment settings, for example signal rate filtering, is essentially equivalent to that obtained when using 10839-1 reference notch.
The sides shall be nominally parallel and the bottom shall be nominally square to the sides. NOTE The bottom or the bottom corners of the notch can be rounded.
In any case, the length of reference notch shall not exceed 50 mm.
BS EN ISO 10893-1:2011
These signals shall be used to activate their respective trigger alarm of the equipment. When using a single reference hole in the sample test pipe, the sample test pipe shall be passed through the inspection equipment with the reference hole, on successive runs positioned as requested in 6. The same equipment settings, for example frequency, sensitivity, phase discrimination, filtering and magnetic saturation, shall be employed.
After checking that the remaining thickness is within tolerance, the tube shall be tested as previously specified. By agreement between the purchaser and manufacturer, the suspect area may be retested by other non-destructive techniques and test methods to agreed acceptance levels. ISO ; b statement of conformity; c any deviation, by agreement or otherwise, from the procedures specified; d product designation by steel grade and size; e type and details of inspection technique s ; f equipment calibration method used; g description of the reference standard acceptance level; h date of test; i operator identification.
The signal response from a subsurface or internal surface imperfection is thus smaller than that from an external surface imperfection of the same size. The capacity of the test equipment to detect subsurface or internal surface imperfections is determined by various factors, but predominantly by the thickness of the tube under test and the eddy current excitation frequency.
The excitation frequency applied to the test coil determines the extent to which the induced eddy current intensity penetrates the tube wall. The higher the excitation frequency, the lower the penetration and conversely, the lower the excitation frequency, the higher the penetration.
In particular, the physical parameters of the tube conductivity, permeability, etc. The minimum length of the longitudinal imperfection which is detectable is principally determined by the search coil arrangement 1093-1 by the rate of change of section along the length of the imperfection. When using this technique on ferromagnetic steel, the products under inspection shall be magnetically saturated inserting them into an external strong magnetic field.
The intention of this saturation is to normalize and reduce the magnetic permeability of the material in order to increase the penetration capability of eddy current and reduce possible magnetic noises from material itself. For 10893-11 reason, this technique detects longitudinal imperfections with a minimum length dependent on the width of the test coil and the inspection helical pitch.
It is recognized that transverse imperfections are not normally detectable. During the fIux leakage testing of tubes, the sensitivity of the test is at a maximum at the tube surface adjacent 108931 the magnetic transducer and decreases with increasing tube thickness due to effective diminishing flux diversion from imperfections at the tube bore surface in relation to that at the external surface.
The signal response from internal surface imperfections can thus be smaller than that from an external imperfection of the same size. For this reason, these techniques detect longitudinal imperfections with a minimum length dependant on the width of the transducer and the inspection helical pitch.
For this reason, the technique detects predominantly transverse imperfections having a minimum length dependant on the circumferential dimension of the transducer.
It is recognized that longitudinal imperfections are not normally detectable unless they have a significant transverse component oblique. It presents the UK view on standards in Europe and at the eh level. It is incorporated by Royal Charter. Users of British Stan- dards should make sure that they possess the latest amendments or editions. It is the constant aim of BSI to improve the quality of our products and serv- ices.
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