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Sensitivity evaluation in double-wall or multi-layer radiographic inspection of welds in pressure vessels

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A discussion is given on IQI (image quality indicator) sensitivity evaluation in double-wall single-image and multilayer radiographic inspection of the girth welds in pressure vessels or pipes. The standards JB4730*, GB3323** and ASME were compared and analysed and it is proposed that IQI sensitivity in double-wall single-image or multi-layer radiography should not be specified and evaluated based on the total penetrated thickness of radiation but the singlewall weld thickness (the thickness of the inspected area). The limitations of positioning the IQI on the film side in the inspection is also pointed out.

The paper is intended to be a reference for revising the related RT standards for international harmonisation in the future.
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Document Type: Research Article

Affiliations: 1: Wuxi Huaguang Boiler Co Ltd 2: Boiler & Pressure Vessel Inspection Centre of Jiangsu Province and the Secretary General of Boiler & Pressure Vessel NDT Qualification Examination Committee of China

Publication date: October 1, 2003

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