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Ultrasonic Thickness Gauging (UTG)

Ultrasonic Thickness Gauging (UTG) is a non-destructive technique for measuring the local thickness of solid material. It is based on the amount of time it takes for an ultrasound wave to travel from under the surface to the depth of the material. In industrial situations, such as mining and shipping industries, UTG is widely used to monitor metal thickness or weld quality.

To access the interior of tanks, decks, and the superstructure’s steel armor, EIWAA’s technicians are equipped with portable UTM probes. By just touching the steel with the measurement head, they can determine its thickness (transducer). In most cases, accuracy is assured by first removing any apparent corrosion scale.

The vast majority of liquid-filled storage tanks are made of carbon steel plate of S 275 JR or S 355 Material.The use of ultrasonic spectral tracking to measure the thickness of corroded steel plates in-situ is described. This spectral tracking method and pulse-echo time-of flight measurements are contrasted. A portion of a steel plate from an oil storage tank that had been failed (as opposed to “passed”) during an inspection was utilized in the measurements. The regions of the plate that were scanned ranged from being “lightly” corroded (with no apparent thickness loss or scaling) to “heavily” corroded (with significant apparent thickness loss and/or scaling). The steel plate’s nominal thickness was 0.25 inches (6.3 mm). The spectrum tracking measurements were performed utilizing a dual, annular element, ultrasonic transducer with a 1 MHz center frequency. Pulse-echo measurements were performed at 15 MHz and 5 MHz. Using the spectral tracking technique, it was feasible to estimate the thickness of the steel plate practically everywhere, but not with the pulse-echo technique. For pulse-echo measurements, the ultrasonic wavelength was too long to use 1 MHz or 2.25 MHz since echo resolution was not attainable at these lower frequencies. There are few discussions regarding corrosion evaluation/thickness gauging of the state of storage tank nowadays. Although not generally recognized, robotic systems are being created  that measure the thickness of the bottom plate using pulse-echo ultrasonics. These do speak to the subject of the present situation. Although the storage tank need not be shut down or de-inventoryed, it does describe a potential way to calculate the tank bottom/tall wall thickness and, consequently, the data required to evaluate the current condition of a storage tank. The procedure is reliable and is open to specialization, mobilization, and commercialization even though the work detailed below was carried out in a lab with general-purpose equipment.