INTERNATIONAL STANDARD
Non-destructivetesting-Ultrasonic thicknessmeasurement
Essais non destructifs - Mesurage de I'epaisseur par ultrasons
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Contents
Page
1 Scope. 12 Normative references. 13 Terms and definitions 14 Measurement modes. 1
5.1 Instruments. 35.2 Probes.. 35.4 5.3 Couplant. Reference blocks.5.5 5.6 Test objects. Qualification of personnel. 3f
Application of the technique. 4
6.1 6.2 Surface conditions and surface preparation. Technique. 46.2.1 General. 4 46.2.2 6.2.3 Measurement during manufacture. In-service measurement of residual wall thickness. 5 59 Selection of instrument. Selection of probe. 66.4 6.5 Materials different from the reference material. 6 66.6 Special measuring conditions.. 6.6.1 General. 76.6.2 Measurements at temperatures below 0 °C. 76.6.3 6.6.4 Measurements at elevated temperatures. Hazardous atmospheres. 7 7
Instrument setting7.2 7.1 Methods of setting General. 7 87.2.1 7.2.2 Digital thickness instruments. General. 87.2.3 A-scan instrument. 8 87.3 Checks of settings 6
8 Influence on accuracy.. 10
8.1 Operational conditions. 108.1.2 8.1.1 Surface conditions. Surface temperature. 10 108.1.3 Metallic coating. 118.1.4 8.1.5 Non-metallic coating.. Geometry. 12 118.2 Equipment. 8.2.1 Resolution. 12 128.2.2 Range 138.3 Evaluation of accuracy. 8.3.1 General. 13 138.3.2 Influencing parameters. Method of calculation. 1414
Influence ofmaterials 14
9.1 Inhomogeneity. General. 149.2 86 Anisotropy 14 14
9.4 9.5 Surface conditions. Attenuation 14 149.5.1 9.5.2 Contact surface. General. 149.5.3 Reflecting surface. 15 159.5.4 Corrosion and erosion. 1510 Test report. 10.1 General. 16 1610.2 10.3 General information. Measurement data. 16 17Annex A (informative) Corrosion in vessels and piping. .18Annex B(informative) Instrument settings 23Annex C (informative) Parameters influencing accuracy. 26Annex D (informative) Selection of measuring technique. 32Bibliography. .37
Foreword
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This document was prepared by Technical Committee ISO/TC 135 Non-destructive testing Submittee SC 3 Uitrasonic testing.
This second edition cancels and replaces the first edition (ISO 16809:2012) which has been technicallyrevised. The main changes pared to the previous edition are as follows:
一 editorial improvements have been made;二 the terminology has been adapted to the latest edition of ISO 5577;一 Formulae (5) and (6) have been corrected.
