Ultrasonic on-line inspection system performs precise control of wall thickness

August 04, 2021

Pipe wall thickness, ovality and eccentricity and other indicators directly affect the gas pipe production qualification rate and service life. Therefore, an on-line detection device capable of reflecting the various parameters of the pipe in real time is increasingly recognized by the majority of gas pipe producers and pipe users, and has become an essential configuration of the gas pipe production line.

At present, ultrasonic thickness measurement system has become the mainstream of gas thickness measurement technology on the market. Other detection technologies, such as X-ray thickness measurement systems, have only been used in certain special cases due to the insufficiency of high radiation, high energy consumption, and high price. Ultrasonic thickness measurement systems are widely accepted by gas pipe manufacturers for their safety, simplicity and accuracy. In Europe and the Middle East, ultrasonic thickness measurement system has become the best choice for gas pipeline online thickness measurement equipment.

In view of this, the German iNOEX company has developed the AUREX ultrasonic on-line inspection system based on its own 20 years of technological innovation in the extrusion industry. The system uses a unique "imis" intelligent measurement integration technology, through its new measurement and function modules, can achieve a full three-dimensional pipe testing. High-frequency probes with frequencies up to 10 to 20 MHz allow the AUREX system to perform continuous detection without any loss. In addition, because of its excellent compatibility, the AUREX system can be easily installed in a variety of gas pipe extrusion lines.
AUREX system is divided into two types: MK (measurement diameter 125mm or less) and AFM (measurement diameter 125mm or more). The entire system includes the measurement chamber and the control unit. The control unit can be integrated into the control system of the production line. Usually, the measuring chamber of the Aurex system is installed in the back of the first section of the vacuum box in the pipe extrusion line. It can measure the various dimensions of the pipe from time to time and transmit it to the control unit through the communication network, so that it can be molded in the first time. The various indicators of the pipe and make accurate and timely adjustments to the thin spots or eccentricity of the pipe. As a result, both the quality of the pipe and the raw material savings are guaranteed. A large number of application examples have proved that according to the difference in extruder extrusion time and start-up time, the investment recovery period of the Aurex system only takes 3 to 6 months.
Temperature and medium are the main factors affecting the ultrasonic transmission rate. Therefore, how to eliminate the influence of temperature and medium in the measurement environment has always been a problem that plagues experts from various countries. For example, in the measurement of large-caliber thick-walled gas pipes, the temperature at different wall thicknesses of the pipes cannot be determined, thus restricting the application of the ultrasonic thickness measurement system in the production of large-diameter gas pipes. However, with the introduction of the Aurex system with iNOEX's Atuomatic calibration function, this industry problem has been perfectly solved. First, the AUREX system will accurately measure the amount of extrusion through its gravimetric metering device. At the same time, the system will calculate the average wall thickness of the pipe at the time. Then, the average wall thickness value is divided by the average value of the ultrasonic return interval between the inner and outer walls of the pipe obtained at each probe location, and the reference rate of the ultrasonic wave in the pipe wall is obtained. Finally, by multiplying this rate by the time interval at each probe, the actual wall thickness of the pipe can be determined in real time.

The automatic wall thickness calibration of the Aurex system is a proprietary technology developed by iNOEX. Similarly, iNOEX has developed a patented water circulation system to eliminate the effects of medium water in the measurement environment.

It is precisely because of the guarantee of the above-mentioned powerful functions that the Aurex system has extremely high precision and extremely strong practicality. The thickness measurement accuracy of the system is up to 0.01mm, and can measure up to 7 layers of multi-layered multi-layered pipe walls, making it not only in the field of gas pipes, but also in the field of automobile pipes.

The quality of gas pipes and automobile pipes directly affects the safety of people's livelihood and people's lives and property. With the progress of our country's society and the economic development, people are increasingly aware of the importance and necessity of ensuring the safety of pipe products. At present, some domestic large-scale gas and automotive pipe manufacturing companies have installed ultrasonic thickness measurement systems on their production lines, which has given them a greater competitive advantage in quality and price. It can be believed that with the increasing recognition of ultrasonic thickness measurement systems by domestic manufacturing enterprises, more and more domestic companies will use this system, which will surely make the safety and use of gas tubes and automobile tubes in China. Life is further improved.

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