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Inspection Modelling

Ultrasonic inspection is widely used to obtain information on the condition of pressure equipment before entering service and while in-service. The objective is to identify and, if possible, to size any degradation or defects that have the potential to threaten the integrity of the equipment. There is an increasing emphasis on quantifying the performance of inspections carried out – for instance, can the inspection actually find the defects of concern and with what level of reliability? This has typically been addressed in the past by validation trials on test pieces with built-in defects. However, the costs of such an approach are normally high and lengthy timescales can be involved. Ultrasonic modelling is an attractive alternative that allows rapid and accurate assessment of the performance of an inspection. It also facilitates optimisation of the approach to inspection through the evaluation of different options with respect to probe placement, travel paths, frequencies, angles etc.

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