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A 3D localization approach for subsea pipelines is proposed using an internal mobile spherical detector without any external auxiliary location measurements. The process of solving for the pipeline orientation using the magnetic field and acceleration measured simultaneously by the spherical detector is formulated in the rotating sensor frame. Specifically, when the frames of the accelerometer and...
A novel method based on the third-order cumulant algorithm is proposed and verified. The algorithm resolves the time delay estimation deterioration problem induced by simple cross-correlation method in locating abnormal vibrations along pipelines. Both the forward and backward acquisition signals are processed using the third-order self- cumulant and cross-cumulant appraisal, so that Gaussian noise...
A method of buried pipeline route detection based on the geomagnetic field was discussed in this paper. Firstly, the phenomenon of geomagnetic field shielded by buried pipeline of different direction was analyzed. Then the mathematical relationship between the magnetic field inside the pipeline and the pipe direction was derived. In the end, the correctness of the theory discussed in detail above...
Generally speaking, the traditional tiny leak detection methods are limited in their ability to survey long reaches of the oil transmission pipelines effectively, highly cost and pose serious risks in blocking the pipeline, etc. So an improved detection system based on ARM-Linux and MEMS sensor is proposed. The spherical detector, whose diameter is less than the pipe diameter, takes advantage of the...
In recent years, industry of the pipeline has developed flourishing[1]. Pipeline leak detection methods positions accuracy can reach the distance between two welds adjacent. Positioning between the magnitude can be used to ascertain the leak point accuracy, which is an important area. Complicated environment in the ocean floor are obstacles to have the aid of other equipment. This article introduces...
Pipeline leakage will not only causes great loss of economy, but also leads to serious pollution to the environment. With the ageing of long distance pipelines which transports oil and gas, the development of pipeline leakage detection and location techniques have been paid more attention. In this paper, cross-correlation method is used to locate pipeline leakage. It is a very important part in the...
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....
Static pressure method and dynamic pressure method were commonly used in pipeline leak detection. Advantages and disadvantages of the two methods were analyzed and a dynamic pressure sensor was designed for long-range oil and gas transmission pipeline. In order to improve its performance, experiments of circuit simulation was carried out on the main part of the sensor. Application experiments show...
Based on electronic deflection and focusing characteristics, ultrasonic phased array technology is used in flaw detection of girth welds for big diameter long distance pipelines, which overcomes the shortcomings in traditional ultrasonic nondestructive testing. Aimed at the detection requirements, a numerical analysis and modelling of a linear phased array transducer are carried out in this article...
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