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Layer detection method is applied in flaw detection of pipeline girth welds when ultrasonic is used. As every layer must be detected, the detection location is changed continuously. The focal length of traditional ultrasonic transducer is fixed. When tested location is changed, the transducer has to be changed, reducing the detection efficiency. Ultrasonic phased array transducer has the ability of...
Traditional ultrasonic testing system has fixed focus, which is burdensome for layer inspection of welds because different layer needs different steering angle and focus ultrasonic beam to inspect. Ultrasonic phased array testing instrument can electronically steer and focus the transmission ultrasonic beams. This ability makes it very advantageous in automatic nondestructive testing in industrial...
An automatic ultrasonic phased array inspection system used for nondestructive testing (NDT) of pipeline girth weld is developed. The linear phased array transducer is optimized by numerical analysis based on a mathematical model. Then hardware and software designs of the system are presented, realizing dynamically focusing in the detection area. A series of technological difficulties are solved....
The pipeline leakage monitor system based on Virtual Instrument are introduced in this paper. As an important means of transportation, pipelines have been used all over the world. Pipeline leakage occurs frequently due to pipeline defect, which not only causes great loss of economy, but also leads to serious pollution to the environment. A real-time monitoring system for pipeline leak is established...
Detection and position of defects in pipeline based on acoustic emission was investigated. The theory of AE pipeline detection and position method was analyzed and a serial of experiments were carried out. Parameters, such as pressure in the pipe, diameter of the leaking hole (leaking hole), and distance from transducers to the leaking hole, were adjusted to show its effects on AE signals caused by...
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