【Ten Years of Rapid Development in Chemical Equipment】2254–2025: Successful Application of China’s First Terahertz Inspection Equipment for Polyethylene Pipes
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Let’s give praise and support to the achievements made in China’s chemical engineering technology and equipment; your participation in discussions is the greatest encouragement. **********************【Ten Years of Progress in Chemical Engineering Equipment】Regular updates and summaries are available – feel free to join the discussions: https://bbs.hcbbs.com/thread-3576046-1-1.html ***************** On March 9, 2025, at a site in Xi’an where a gas company was carrying out hot-melt welding of polyethylene pipes, the Research Institute of Engineering Materials of China National Petroleum Corporation conducted on-site tests of the country’s first set of terahertz-based online automatic inspection devices for polyethylene pipes used in petrochemical applications, and these tests were a complete success! The terahertz online automatic inspection equipment for polyethylene pipes used in the petrochemical industry in these tests was independently developed by the Research Institute of Petroleum Pipes and Equipment Integrity under the Engineering Materials Research Institute. It is capable of performing online, automatic, non-destructive inspections on non-metallic pipes, calculating the dimensions of defects within their structure, and carrying out three-dimensional reconstruction, thereby providing inspection data for assessing the severity of those defects. During this field application test, the project team carried out immediate 3D scanning of the heat-fused joints of the DN250 polyethylene pipes that had been welded on-site. The 100% terahertz inspection of a single weld seam took approximately 30 minutes, which is consistent with the speed at which heat fusion welding is performed on pipes in the field. The test results can display the overall defect conditions of polyethylene pipe hot-melt joints in real time, providing effective support for on-site welding quality control.
【Ten Years of Rapid Development in Chemical Engineering Equipment】Mass production of domestic T1100 ultra-high-strength carbon fiber on a thousand-ton scale from 2025 to 2033 https://bbs.hcbbs.com/thread-5682020-1-1.html (Source: Haichuan Chemical Industry Forum)
【Ten Years of Rapid Development in Chemical Engineering Equipment】Commissioning of a pilot-scale project for magnesium hydride production with an annual capacity of 150 tons, using independent intellectual property rights, from 2051 to 2025: https://bbs.hcbbs.com/thread-5681948-1-1.html (Source: Haichuan Chemical Industry Forum)
Currently, polyethylene pipes are widely used in fields such as surface oil and gas transmission, urban gas supply, and petrochemical processing, addressing the corrosion problem associated with conventional carbon steel pipes. Compared to metal pipes, the research and application of non-destructive testing techniques for polyethylene pipes at home and abroad are relatively lagging behind; as a result, it is not possible to conduct effective and accurate detection and evaluation of the base material as well as welding defects, which leads to frequent safety accidents. Terahertz (0.1–10 THz) detection methods possess unique advantages such as high resolution, tomographic scanning, and 3D reconstruction, but they have yet to overcome the challenges of detecting surface defects and performing on-site, real-time inspections. Since 2020, with the support of projects such as **, as well as key research and development programs at the group and provincial/municipal levels, the project team has overcome various challenges related to terahertz field testing of non-metallic pipes, including the selection of appropriate time-domain spectra, identification of defect characteristics, design and control of automated scanning systems, and high-precision 3D reconstruction of defect shapes and sizes. As a result, they have successfully developed China’s first set of equipment for terahertz-based online automatic testing of polyethylene pipes used in the petrochemical industry. This device can effectively detect defects such as inclusions, pores, lack of fusion, and incomplete welding in the hot-melt welded joints of polyethylene pipes. Laboratory tests have shown a detection rate of over 95%, with a dimensional measurement error of less than 50 μm.
【Ten Years of Rapid Development in Chemical Equipment】First domestically produced 80,000 cubic meter air separation compressor put into operation from 2025 to 2055 https://bbs.hcbbs.com/thread-5682284-1-1.html (Source: Haichuan Chemical Industry Forum)
Give a thumbs up to the development of China’s chemical equipment manufacturing industry!