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Determining 2-2T Equivalent IQI Sensitivity in Radiographs

As an NDT technician performing radiography, you have probably heard that the image quality of radiographs should be equivalent to 2-2T or better. However, this is not accurate in accordance with Table T-276 (“Equivalent IQI Sensitivity”) as published in the ASME Boiler and Pressure Vessel Code (BPVC), Section V: Nondestructive Examination (ASME 2017). This paper demonstrates that Table T-276 (ASME 2017) is not 2-2T; and at certain thicknesses, the ability to comply with the IQI sensitivity and definition is very improbable.

References

ASME, 2017 ASME Boiler and Pressure Vessel Code, Section V: Nondestructive Examination, The American Society of Mechanical Engineers (ASME), New York, NY.

ASTM, 2015, ASTM E1030 - Standard Practice for Radiographic Examination of Metallic Castings, ASTM International, West Conshohocken, PA.

ASTM, 2016, ASTM E1255 - Standard Practice for Radioscopy, ASTM International, West Conshohocken, PA.

ASTM, 2017, ASTM E94 - Standard Guide for Radiographic Examination Using Industrial Radiographic Film, ASTM International, West Conshohocken, PA.

ASTM, 2018a, ASTM E747 - Standard Practice for Design, Manufacture and Material Grouping Classification of Wire Image Quality Indicators (IQI) Used for Radiology, ASTM International, West Conshohocken, PA.

ASTM, 2018b, ASTM E1025 - Standard Practice for Design, Manufacture, and Material Grouping Classification of Hole-Type Image Quality Indicators (IQI) Used for Radiology, ASTM International, West Conshohocken, PA.

ASTM, 2018c, ASTM E1742 - Standard Practice for Radiographic Examination, ASTM International, West Conshohocken, PA.

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