The market for non-destructive testing of pipelines constructed using trenchless methods is steadily expanding.

2023-03-03

With the accelerated pace of urban development, underground utility networks are being laid ever more densely, resulting in a complex and interwoven web of pipelines that crisscross and tangle beneath city streets. Traditional trenching methods for pipe installation are characterized by long construction periods, significant environmental impacts, and high safety risks. To ensure the efficient and safe operation of urban infrastructure and to maximize the utilization of vertical underground space, an increasing number of trenchless construction techniques—such as pipe jacking, microtunneling, and directional drilling—are being applied in engineering projects. This, in turn, has placed new demands and challenges on detection technologies for deeply buried trenchless pipelines. I. Trenchless Pipeline Detection

Application of Eddy Current Testing in Equipment Corrosion Inspection

2022-12-29

In equipment corrosion detection, the inspection technique is of paramount importance, directly determining the quality of the inspection. The adoption of eddy current testing is conducive to improving the efficiency of equipment inspection. I. Principle of Pulse Eddy Current Scanning Technology Eddy current testing is an inspection method that leverages the principles of electromagnetic induction. During implementation, the eddy currents generated through electromagnetic induction are utilized to conduct a practical analysis of the magnetic impedance within the equipment, thereby providing insights into its operational performance. The application of eddy current testing in contemporary equipment inspection

Magnetic Particle Testing Techniques and Methods for Welds in Pressure Piping

2022-12-03

The basis of magnetic particle testing lies in the magnetic interaction between the leakage magnetic field at a defect and magnetic particles: when a ferromagnetic material or workpiece is magnetized, any discontinuities on or near the surface cause local distortion of the magnetic flux lines as they leave and re-enter the material, thereby generating magnetic poles and forming a detectable leakage magnetic field. This leakage field attracts the magnetic particles applied to the workpiece surface, producing magnetic marks that are visually observable under appropriate lighting, thus revealing the location, shape, and size of the discontinuity. I. Scope of Application for Magnetic Particle Testing Magnetic particle testing is suitable for detecting ferromagnetic materials.

UT Defect Characteristics of Small-Diameter Pipe Welds in Ultrasonic Testing

2022-11-17

1. Overview In ultrasonic testing, the three key aspects of defect evaluation are localization, quantification, and characterization. Currently, research on defect localization and quantification in ultrasonic testing has reached a relatively mature stage; however, the characterization of defects remains underdeveloped. Ultrasonic testing standards mandate defect localization and quantification, but do not require defect characterization due to the inherent difficulties involved. This is because the ultrasonic reflection characteristics of a defect depend on its orientation, geometric shape, and its dimensions—length and thickness—in relation to the direction of ultrasonic wave propagation.

Method for Detecting “Internal Defects” in Fillet Welds Using Phased-Array Ultrasonic Testing

2022-11-10

Welding is a manufacturing process and technology that joins metallic materials by means of heating, high temperature, or high pressure. Various types of welded joints are widely used in petrochemical plants and play a crucial role in the fabrication of pressure-containing special equipment. Consequently, the quality of welded joints is of paramount importance for the safe operation of such equipment. Welding is a manufacturing process and technology that joins metallic materials by means of heating, high temperature, or high pressure. Various types of welded joints are widely used in petrochemical plants and play a crucial role in the fabrication of pressure-containing special equipment. Therefore

Current Status and Improvement Strategies for Pipeline In-Service Inspection Technologies and Management

2022-11-04

Pipeline defects have long been the primary cause of pipeline failure, and the use of internal inspection technologies to detect and identify such defects has become a widely recognized practice both domestically and internationally. To further promote the development of internal inspection technologies and enhance management standards, this study systematically reviews the technical capabilities and evolutionary trajectories of leading domestic and international companies providing internal inspection services for pipelines. It also analyzes the limitations of existing internal inspection techniques in addressing girth weld defects, crack defects, pinhole corrosion defects, and the assessment of pipeline stress states in oil and gas pipelines. Furthermore, the study identifies the challenges currently faced in the management of internal inspection technologies from three perspectives—government, pipeline operators, and internal inspection service providers—and proposes a multi-dimensional approach to application.

Ultrasonic Testing of Plates, Profiles, and Bars

2022-10-20

I. Ultrasonic Testing of Plates Ultrasonic testing of thick and medium-thick plates—using the shear-wave method. To detect defects that are oriented at a certain angle to, or even perpendicular to, the plate surface—such as cracks—it is necessary, when required, to supplement the inspection with shear-wave testing. The determination of the conditions for shear-wave testing of plates, including the calibration of the incident angle or the refraction angle (or K-value), is conducted in the same manner as for conventional shear-wave testing; sensitivity adjustment, however, is performed using reference test blocks made of the same grade, material, metallurgical condition, and surface condition as the test piece, with notches or cylindrical holes serving as reflectors.

Research on Crack Detection Using Radiographic Testing

2022-10-15

Radiographic Resolution As shown in Figure 3-3, a beam of radiation perpendicular to the surface of the test specimen is used to radiograph a metallic step block. In theory, the image on the radiographic film should consist of two regions of uniform blackness: one region of high blackness corresponding to the AO portion of the specimen, and another region of low blackness corresponding to the OB portion. The boundary between these two regions should exhibit a sharp, discontinuous transition in blackness, as illustrated in Figure 3-3a. However, in practice, the variation in blackness on the film is not abrupt. The “step-edge” image of the specimen is blurred,

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