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Figure 14 – Schematic drawing of sectorial scanning.

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4. New NDT Application in Turret Weld Inspection

Now we will describe the advantage of the use of these new NDT techniques (ACFM, UT TOFD and UT Phased Array) on FPSOs turret weld inspection.

4.1 ACFM

The use of ACFM technique, figure 15, has given better information (dimensions) about the more severe surface discontinuities (cracks). The method gives not only crack length but also crack depth (parameter used to calculate crack severity by fracture mechanic). All surface cracks were considered not relevant and they have been monitored by ACFM to verify crack increasing and new crack appearing.

Figure 15 – ACFM turret weld inspection.

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