AS 2452.3-1985

1 - AS 2452.3-1985 NON-DESTRUCTIVE TESTING - DETERMINATION OF THICKNESS - USE OF ULTRASONIC TESTING
3 - PREFACE
3 - CONTENTS
4 - 1 SCOPE.
4 - 2 APPLICATION.
4 - 2.1 Base Line Survey.
4 - 2.2 Key Point Survey.
4 - 3 REFERENCED DOCUMENTS.
4 - 4 DEFINITIONS.
4 - 4.1 Nominal thickness (T)
4 - 4.2 Indicated thickness (Ti )
4 - 4.3 Reported thickness (T)
4 - 4.4 Testing authority
4 - 4.5 Delay block spacer
4 - 5 EQUIPMENT.
4 - 5.1 General.
4 - 5.2 A-scan presentation.
5 - 5.3 Digital and analog (meter) displays.
5 - 5.4 Couplant.
5 - 6 CALIBRATION.
5 - 6.1 General.
5 - 6.2 Calibration - A-scan presentation.
5 - 6.3 Calibration-digital and analog (meter) display.
5 - 7 PREPARATION OF TEST SURFACE.
5 - 8 SINGLE SPOT - SINGLE MEASUREMENT METHOD (SS).
5 - 8.1 Application.
5 - 8.2 Procedure.
5 - 9 SINGLE SPOT - DOUBLE MEASUREMENT METHOD (SD).
5 - 9.1 Application.
5 - 9.2 Procedure.
5 - 10 MULTIPLE SPOT MEASUREMENT METHOD (MS).
5 - 10.1 Application.
6 - 10.2 Procedure.
6 - 11 CLOSE GRID SURVEY METHOD (CG).
6 - 11.1 Application.
6 - 11.2 Procedure.
6 - 12 OPEN GRID MEASUREMENT METHOD (OG).
6 - 12.1 Application.
6 - 12.2 Procedure.
6 - 13 RECORD OF RESULTS.
6 - 14 TEST REPORT.
6 - 14.1 General.
6 - 14.2 Abnormal conditions.
7 - APPENDIX A - SUPPLEMENTARY INFORMATION
7 - A1 GENERAL.
7 - A2 TESTING AUTHORITIES.
8 - APPENDIX B - GUIDANCE ON THE DETERMINATION OF THICKNESS AT ELEVATED TEMPERATURES
9 - APPENDIX C - FACTORS AFFECTING PROBE SELECTION
9 - C1 GENERAL.
9 - C2 FREQUENCY.
9 - C3 SINGLE PROBES.
9 - C4 SINGLE PROBES WITH SPACERS.
9 - C5 TWIN PROBES.
10 - APPENDIX D - NOMINAL VELOCITY OF SOUND IN SOME COMMON MATERIALS
11 - APPENDIX E - DETERMINATION OF THICKNESS BY THE USE OF CORRECTION FACTORS AND CHARTS
11 - E1 GENERAL.
11 - E2 DETERMINATION OF THICKNESS BY MEANS OF A CORRECTION CHART
12 - E3 DETERMINATION OF THICKNESS BY THE USE OF A CORRECTION FACTOR
13 - APPENDIX F - FACTORS AFFECTING RESULTS AND ORDER OF ACCURACY
13 - F1 GENERAL.
13 - F2 DIGITAL AND ANALOG (METER) DISPLAYS - ABNORMAL VALUES.
13 - F2.1 No meter readout.
13 - F2.2 Readout approximately half or double anticipated thickness.
13 - F3 CURVATURE OR LACK OF PARALLELISM OF REFLECTING SURFACES
13 - F4 CORRODED REFLECTING SURFACES.
13 - F5 MULTIPLE ECHOES.
13 - F6 SURFACE COATINGS.
13 - F7 REPORTED ORDER OF ACCURACY.
15 - APPENDIX G - NOTES ON METHODS OF MEASUREMENT
15 - G1 SINGLE SPOT - SINGLE MEASUREMENT (SS).
15 - G2 SINGLE SPOT - DOUBLE MEASUREMENT (SD).
15 - G3 MULTIPLE SPOT MEASUREMENTS (MS).
15 - G4 GRID METHODS (CG AND OG).

Sets out procedures involving ultrasonic pulse-echo principles for determination of thickness of material in which scanning and reflecting surfaces are substantially parallel. Describes five methods including single spot (single measurement), single spot (double measurement), multiple spot measurements, close grid survey method and open grid method.

This standard sets out five methods for the determination of thickness of material based on the use of ultrasonic pulse-echo principles where scanning and reflecting surfaces are substantially parallel. The methods are as follows:(a) Single spot - single measurement (SS).(b) Single spot - double measurement (SD).(c) Multiple spot measurements (MS).(d) Close grid survey method (CG).(e) Open grid method (OG).NOTES:1. Supplementary information required to augment the standard is set out in Appendix A.2. Factors affecting the results and order of accuracy achieved are given in Appendix F.