Radiographic Examination (RT)

RT is very useful for detecting both surface and internal flaws, and it is the primary NDE procedure required by the ASME Code to verify the quality of welds during construction. However, the associated radiation hazard makes it difficult to use for inspection of pressure vessels during shutdowns, when other personnel are working on the same vessel or close to it. The investment in equipment (radiation sources and darkroom facilities for processing film) can also be quite high, but this can be offset by the use of qualified contractors.

Article 2 of ASME Code, Section V, gives the minimum requirements for an RT procedure for pressure vessels.

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