• Thomas R. Hay, Ph.D., P.E

Non-destructive Testing Inspector Performance Variations

Description of Welded Joints and Inspection Process

Non-destructive testing (NDT) inspector performance demonstration qualification (PDQ) is now required by most major structural codes including American Petroleum Institute (API), American Society for Mechanical Engineer Boiler and Pressure Vessel Code (BPVC), and American Welding Society (AWS) Bridge Welding Code (BWC). The objective of the PDQ for an NDT inspector is to confirm their proficiency in applying an NDT procedure, from calibration through reporting, to detect, size, and characterize material defects at a sufficient performance level, or confidence level, for the results to be compliant with desired risk assessment and probabilistic analyses.

Figure 1: Non-destructive testing of bridge poses physical challenges that may impact NDT inspector performance.