Corrosion Assessment using Advanced Ultrasonic Measurement Technique

Abstract

This paper describes the remaining wall thickness assessment using Ultrasonic Testing Phased Array (UTPA) technique. A steel plate of thickness 15 mm consists of machined simulated corrosion with various thicknesses, depths, shapes, and sizes were used in this work. Manual corrosion scanner is attached with GE Phased Array (PA) thirty-two elements (transmitter and receiver) Dual Matrix probe of 5 MHz with 1.5 mm pitch is used. The scanner then applied firmly on the plate to execute the inspection. From the result, the relevant indications from the A, B and C-Scans display are collected and analysed. The outcome of the study revealed that UTPA technique is capable to collect a high density of measuring point of thickness compared to the conventional UT technique such as Ultrasonic Testing Thickness Gauge (UTTG).

Enhancing Turnaround Maintenance in Process Plants through On-Stream Phased Array Corrosion Mapping: A Review

“…Tangadi et al [14] found that PAUT's scanning speed covered a 30mm width in a single scan. Similarly, Jamil et al [13] reported that corrosion mapping using PAUT offers good detectability and comprehensive results through A-, B-, and C-scan displays. These studies underscore the superiority of PACM in terms of efficiency and accuracy for corrosion detection and analysis.…”

“…However, it is challenging to apply this technique during on-stream inspections where elevated temperatures often exceed the recommended ultrasonic testing (UT) temperature limit of 52 °C [12]. Although success articles related to PACM applications exist [13][14][15], they mainly pertain to ambient temperature. An exception is the work of Turcu et al [16], who introduced the use of a dual linear probe to conduct PACM experiments at temperatures of up to 150 °C.…”

Experimental Investigation on the Corrosion Detectability of A36 Low Carbon Steel Used in Multi-bolted Connections by the Method of Phased Array Corrosion Mapping

“…Instead of a side drill hole [38], general corrosion was represented by a machining notch with a 5mm width and varying depths of 2mm, 4mm, 6mm, and 8mm. In comparison, localized corrosion is represented by flat bottoms holes (FBH) and varying diameters of 20mm, 15mm, 10mm, and 5mm from rolls with different depths of 3mm (20% wall loss) and 6mm (40% wall loss) for calibration and carryout experiment test [39]. Figure 1 gives the test specimen design with detailed dimensions, and Figure 2 contrasts the specimen 3D view and the fabricated test specimen by machining.…”