Technical Basis for ASME Section VIII Code Case 2235 on Ultrasonic Examination of Welds in Lieu of Radiography

This paper addresses implementation of ultrasonic (UT) process qualification by performance demonstration as imposed by the ASME Boiler and Pressure Vessel Code Section XI, Appendix VIII. The intended audience for the present paper is an engineer with a good knowledge of NDE, but a limited knowledge of the ASME Codes and Standards. The starting point for application of UT performance demonstration is described in a paper published in this journal just over a decade ago by Cowfer and Hedden. That paper addressed the application of ultrasonic performance demonstration to qualify an examination process for ASME Code Section XI inservice inspection. The present paper provides a brief summary of papers specifically selected to provide the reader with a concise update of progress in UT performance demonstration since the earlier paper. Given that qualification, the reader should not expect new information in this present paper. The papers selected have been mostly selected from those presented at ASME Pressure Vessels and Piping Conferences, from 1995 to 2002, addressing the subsequent development and application of the UT performance demonstration process. The emphasis is on work performed for nuclear utilities under the Performance Demonstration Initiative (PDI), for application to Section XI inservice inspection. However, material also is included describing parallel work in the European Community, and applications of UT performance demonstration in Sections I and VIII of the ASME Boiler and Pressure Vessel Code, for use of UT in place of RT for new construction, are included.

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Sizing in the phased array technique using diffraction and amplitude displacement

Nardoni¹,

Nardoni²,

Certo³

et al. 2008

Insight - Non-Destructive Testing and Condition Monitoring

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Abstract. This report shows the results of an experimental work carried out with the aim to improve defect analysis and sizing of both volumetric and planar defects, detected and imaged with the phased array probe technique. The phased array technique produces S-scan type images of defects which put easily in evidence the structure of the relevant echo indications. Depending of defect morphology, we can see diffracted echoes from planar defects, and also secondary echoes (improperly considered as diffracted echoes), generated by a complex conversion mode process, from volumetric ones. We can see also single indications, when defect height is comparable with ultrasonic wavelength or its complex geometry destroy diffracted or secondary indications, and, finally, we can see clustered indications. Thus we have to recognize such different image structures in order to apply the most suitable sizing procedure. The obtained results are very satisfactory and allow us to be more confident in apply phased array technique.

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Technical Basis for ASME Section VIII Code Case 2235 on Ultrasonic Examination of Welds in Lieu of Radiography

Cited by 4 publications

References 5 publications

Dynamic Defect Detection in Fast, Robust NDE Methods by Transfer Learning Based Optimally Binned Hypothesis Tests

Dynamic Defect Detection in Fast, Robust NDE Methods by Transfer Learning Based Optimally Binned Hypothesis Tests

Overview of the Impact of Ultrasonic Examination Performance Demonstration on the ASME Boiler and Pressure Vessel Code

Sizing in the phased array technique using diffraction and amplitude displacement

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