ISO 25902-1:2009
(Main)Titanium pipes and tubes — Non-destructive testing — Part 1: Eddy-current examination
Titanium pipes and tubes — Non-destructive testing — Part 1: Eddy-current examination
ISO 25902-1:2009 specifies a method for the eddy-current examination for detecting flaws in titanium seamless tubes and welded tubes. Titanium tubes are now used as steam surface condensers in steam-power plants, anatomic-power plants and desalination plants. Therefore, the quality of titanium tubes is very important and this is why the eddy-current inspection method was established. This method also applies to titanium alloy tubes.
Canalisations et tubes en titane — Essai non destructif — Partie 1: Contrôle par courants de Foucault
General Information
Standards Content (Sample)
INTERNATIONAL ISO
STANDARD 25902-1
First edition
2009-02-01
Titanium pipes and tubes —
Non-destructive testing —
Part 1:
Eddy-current examination
Canalisations et tubes en titane — Essai non destructif —
Partie 1: Contrôle par courants de Foucault
Reference number
ISO 25902-1:2009(E)
©
ISO 2009
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ISO 25902-1:2009(E)
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ii © ISO 2009 – All rights reserved
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ISO 25902-1:2009(E)
Contents Page
Foreword .iv
1 Scope.1
2 Normative reference.1
3 Terms and definitions .1
4 General .2
4.1 Applicable dimension range.2
4.2 Summary of examination method.2
4.3 Personnel .2
5 Apparatus.2
6 Reference piece .3
6.1 Purpose .3
6.2 Materials .3
6.3 Reference standards .3
6.4 Fabrication of reference standards .5
6.5 Number and interval of reference standards.5
7 Test method .5
7.1 Test frequency .5
7.2 Test coil .5
7.3 Settings.5
7.4 Confirmation of sensitivity of eddy-current test instrument .7
8 Acceptance criteria .7
9 Test report.8
© ISO 2009 – All rights reserved iii
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ISO 25902-1:2009(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). 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. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
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. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 25902-1 was prepared by Technical Committee ISO/TC 79, Light metals and their alloys, Subcommittee
SC 11, Titanium.
ISO 25902 consists of the following parts, under the general title Titanium pipes and tubes — Non-destructive
testing:
⎯ Part 1: Eddy-current examination
⎯ Part 2: Ultrasonic examination for the detection of longitudinal flaws
iv © ISO 2009 – All rights reserved
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INTERNATIONAL STANDARD ISO 25902-1:2009(E)
Titanium pipes and tubes — Non-destructive testing —
Part 1:
Eddy-current examination
1 Scope
This part of ISO 25902 specifies a method for the eddy-current examination, hereafter referred to as the
“examination”, for detecting flaws in titanium seamless tubes and welded tubes, hereafter referred to as the
“tubes”.
Titanium tubes are now used as steam surface condensers in steam-power plants, anatomic-power plants
and desalination plants. Therefore, the quality of titanium tubes is very important and this is why the
eddy-current inspection method was established. This method also applies to titanium alloy tubes.
In this part of ISO 25902
⎯ the minimum wall thickness is 0,3 mm,
⎯ the rectangular groove and the drilled hole are permitted as reference standards,
⎯ as the outside diameter of the titanium tube increases, the detected flaw also increases. The limit of the
outside diameter of the titanium tube is 38,1 mm.
2 Normative reference
The following referenced document is indispensable for the application of this document. For dated references,
only the edition cited applies. For undated references, the latest edition of the referenced document (including
any amendments) applies.
ISO 15548-1, Non-destructive testing — Equipment for eddy current examination — Part 1: Instrument
characteristics and verification
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
straightening mark
circumferentially spiral micro-dimensional variation which is generated by a straightening roll when a tube
bend is straightened
3.2
ring mark
circumferential-like micro-dimensional variation which is generated by the stop of a roll when materials are
cold rolled
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ISO 25902-1:2009(E)
3.3
rough surface
partial variation in roughness on the surface of a tube, which is the residue of a surface-finish trace
3.4
dent
partial variation on the surface of a tube, which is generated by mechanical shock
4 General
4.1 Applicable dimension range
The range of the applicable dimensions of a tube shall be 10 mm to 150 mm outside diameter and 0, 3 mm to
10 mm thickness.
4.2 Summary of examination method
The examination shall be carried out by using an encircling coil (hereafter, referred to as the “test coil”).
4.3 Personnel
This inspection shall be carried out by suitably trained operators and supervised by competent personnel
nominated by the manufacturer. In the case of third-party inspection, this shall be agreed between the
purchaser and manufacturer.
5 Apparatus
5.1 Test apparatus, composed of a flaw detector, a test coil, a tube feed device (including a coil-holding
table), and an automatic alarm system or a r
...
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