Pinhole & Pitting Corrosion Inspection

Accurately addressing and measuring metal loss

High-Resolution Pinhole and Pitting Metal Loss Inspection

Pipeline operators have long identified pinhole and especially embedded pinhole defects as a significant risk factor in their integrity management programs. NDT Global, a leading supplier of ultrasonic pipeline inspection and pipeline integrity management services, announced that it is now offering a high-resolution pinhole and pitting (UMp) metal loss inspection service to help operators mitigate such risks.

The UMp service reliably detects defects and sizes as small as 5 mm (0.2 in) which represents a two-fold improvement in the minimum sizing threshold, from the previous entry level ultrasonic service of 10 mm (0.4 in), and it will be a standard offering in all of the NDT Global markets.

While many inline inspection (ILI) providers still offer corrosion inspections these are without the resolution required to detect and size pinhole defects, with some ultrasonic services only reliably detecting features greater than 10 mm (0.4 in) and sizing features greater than 20 mm (0.8 in). Higher-resolution inspection of features identifies the true deepest point of a pinhole morphology within a larger area of corrosion with an overall shallower depth.

Using high resolution tools one can detect and size tiny corrosion spots pinholes with dimension < 10 mm (<0.39 in) even in welds. Using the higher-resolution tools, however, such defects are nowadays found quite frequently.

Pinhole in girth weld

Our Ultrasonic Tools

EVO Series UMP

NDT Global offers high-resolution pinhole and pitting (UMp) metal loss inspection service as standard.

The UMp service reliably detects defects and sizes as small as 5 mm (0.2 in) diameter, which represents a two-fold improvement in the minimum sizing threshold, from the previous entry level ultrasonic service of 10 mm (0.4 in).

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Ultrasonic Corrosion Inspection

Detection of corrosion features with a diameter of 5 mm (0.2 in) reaches a probability of detection level (POD) of more than 90%. Classification and depth sizing is provided for all metal loss defects from 5 mm (0.19 in) on wards. High-resolution river bottom profiles enable accurate defect assessments.