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N.D.E. Examinations - Ultrasonics Thickness Surveys (UTT)

Ultrasonic Thickness Survey is used throughout the world for assessing the condition of pipes, tanks, pressure vessels and other wall thicknesses. A digital or analog measuring device is used for gathering the ultrasonic thickness of the base material. These thicknesses are usually placed in a data management program such as UltraPipe or PCMS. A thickness gauge is calibrated to a standard of similar acoustical velocity of the material to be examined. Thicknesses are then taken from areas that corrode or erode. A transducer is coupled to the material and thickness is determined. Couplant is used to ensure an acoustical connection with the base material. These “TML” or thickness measurement locations are documented on an isometric or other drawing. This information is then typed in or electronically transmitted to a Data Management Program. These programs compare the existing thickness with the required thickness for the known pressures and temperatures. The program then determines the next required inspection and the remaining life of the system. Although, there are other methods of determining the remaining life of the piping system, the ultrasonic thickness method is the most common, and an effective tool.

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