ISO 25902-2:2010

INTERNATIONAL ISO
STANDARD 25902-2
First edition
2010-03-01
Titanium pipes and tubes —
Non-destructive testing —
Part 2:
Ultrasonic testing for the detection of
longitudinal imperfections
Canalisations et tubes en titane — Essai non destructif —
Partie 2: Contrôle par ultrason pour la détection des défauts
longitudinaux
Reference number
©
ISO 2010
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Foreword
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ISO 25902-2 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 testing for the detection of longitudinal imperfections

INTERNATIONAL STANDARD ISO 25902-2:2010(E)

Titanium pipes and tubes — Non-destructive testing —
Part 2:
Ultrasonic testing for the detection of longitudinal
imperfections
1 Scope
This part of ISO 25902 specifies an ultrasonic testing method for detecting longitudinal imperfections in
titanium seamless tubes or welded tubes.
This part of ISO 25902 also applies to titanium alloy tubes.
In this part of ISO 25902
a) the minimum wall thickness is 0,3 mm,
b) only rectangular notches are permitted as reference reflectors, and
c) the minimum notch depth is 0,08 mm.
2 Normative references
The following referenced documents are 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 9712, Non-destructive testing — Qualification and certification of personnel
ISO 10375, Non-destructive testing — Ultrasonic inspection — Characterization of search unit and sound field
ISO 18175, Non-destructive testing — Evaluating performance characteristics of ultrasonic pulse-echo testing
systems without the use of electronic measurement instruments
3 General
3.1 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. The ratio of thickness to outside diameter shall be less than or equal to 0,2 (20 %).
3.2 Testing technique
The test shall be carried out using an ultrasonic angle beam technique, effected by rotating the ultrasonic
transducer or the tube.
The ultrasonic testing system shall be an immersion technique (including a local immersion technique).
3.3 Personnel
This test shall be carried out by suitably trained operators qualified in accordance with ISO 9712 or equivalent
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.
Non-destructive testing (NDT) operators shall be authorized by a level 3 NDT individual approved by the
employer.
4 Apparatus
4.1 Ultrasonic system, composed of an ultrasonic instrument, at least one ultrasonic transducer, a
tube-feeding device, a rotary device for transducers or tubes, and an automatic alarm and recording system.
The performance of the transducer shall comply with ISO 10375.
The whole test system, i.e. instrument, transducer, tube-feeding device, automatic alarm and recording
system, shall be capable of detecting the required reference reflector with a sufficient signal-to-noise ratio.
4.2 Ultrasonic instrument, whose amplitude linearity shall be measured in accordance with ISO 18175.
...