Standard
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AS ISO 16809:2020
[Current]Non-destructive testing — Ultrasonic thickness measurement
The objective of this Standard is to specify the principles for ultrasonic thickness measurement of metallic and non-metallic materials by direct contact, based on measurement of time of flight of ultrasonic pulses only.
Published: 09/04/2020
Pages: 36
Table of contents
Cited references
Content history
Table of contents
Header
About this publication
Preface
Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Measurement modes
5 General requirements
5.1 Instruments
5.2 Probes
5.3 Couplant
5.4 Reference blocks
5.5 Test objects
5.6 Qualification of personnel
6 Application of the technique
6.1 Surface conditions and surface preparation
6.2 Technique
6.2.1 General
6.2.2 Measurement during manufacture
6.2.2.1 Modes 1, 2 and 3
6.2.2.2 Mode 4
6.2.3 In-service measurement of residual wall thickness
6.3 Selection of probe
6.4 Selection of instrument
6.5 Materials different from the reference material
6.6 Special measuring conditions
6.6.1 General
6.6.2 Measurements at temperatures below 0 °C
6.6.3 Measurements at elevated temperatures
6.6.4 Hazardous atmospheres
7 Instrument setting
7.1 General
7.2 Methods of setting
7.2.1 General
7.2.2 Digital thickness instruments
7.2.3 A-scan instrument
7.3 Checks of settings
8 Influence on accuracy
8.1 Operational conditions
8.1.1 Surface conditions
8.1.1.1 Cleanliness
8.1.1.2 Roughness
8.1.1.3 Surface profile
8.1.2 Surface temperature
8.1.3 Metallic coating
8.1.4 Non-metallic coating
8.1.5 Geometry
8.1.5.1 Parallelism
8.1.5.2 Curved surfaces
8.1.5.3 Concave and convex scanning surfaces
8.1.5.4 Range of thickness
8.2 Equipment
8.2.1 Resolution
8.2.2 Range
8.3 Evaluation of accuracy
8.3.1 General
8.3.2 Influencing parameters
8.3.3 Method of calculation
9 Influence of materials
9.1 General
9.2 Inhomogeneity
9.3 Anisotropy
9.4 Attenuation
9.5 Surface conditions
9.5.1 General
9.5.2 Contact surface
9.5.3 Reflecting surface
9.5.4 Corrosion and erosion
10 Test report
10.1 General
10.2 General information
10.3 Measurement data
Annex A
A.1 General
A.2 Measurement of general corrosion
A.2.1 Instrument
A.2.2 Probes
A.2.3 Setting of the instrument
A.2.4 Measuring
A.3 Measurement of corrosion with pitting
A.3.1 Instrument
A.3.2 Probes
A.3.3 Setting of the instrument
A.3.4 Measuring
Annex B
Annex C
C.1 Parameters influencing accuracy
C.2 Methods of calculation
Annex D
Bibliography
Cited references in this standard
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