Contents
1 Scope
2 Reference standards
3 Terms
4 General requirements
5 Detection of butt welds of pipes with medium-thick walls
6 Inspection for butt welds of pipes with medium-small diameters and thin walls
7 Inspection for butt welds of Austenite pipes with medium-small diameters and thin walls
Appendix A (Normative appendix) Portable sample
Appendix B (Normative appendix) Reference sample for defect at weld joint root
Appendix C (Normative appendix) Longitudinal transverse wave tandem scan method
Appendix D (Normative appendix) Drawing of distance—wave amplitude (DAC) curve
Appendix E (Normative appendix) Measurement of compensation rate
Appendix F (Reference appendix) Analysis on reflection echo
Appendix G (Normative appendix) Special sample DL-1 for ultrasonic inspection of butt welds of small-diameter pipe
Appendix H (Normative appendix) Method and requirement for regrinding of detecting head
Appendix I (Normative appendix) Parameter and performance measurement of detecting
head for pipes with medium-small diameters and thin walls
Appendix J (Normative appendix) Adjustment of time base line scan for pipes with medium-small diameters and thin walls | 
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