Domestic long-distance pipeline welding units can complete over 70 welds per day at their peak

Thread Content

CNPC Pipeline Bureau develops its own welding technology, breaking foreign monopoly Author: Song Mintao, Li Yuanying Source: China News Network The CNPC Natural Gas Pipeline Bureau (hereinafter referred to as the Pipeline Bureau) revealed on the 29th that the CPP900 automatic welding equipment developed by the bureau has recently completed welding work on a total length of 4,000 pipe joints, with a success rate of over 95%. This technology has successfully broken the foreign monopoly and contributed to the localization of pipeline construction equipment in China. 　　It is understood that the Mo-Da Line 2 project of the China-Russia crude oil pipeline is a large-diameter, high-pressure, long-distance crude oil pipeline that passes through permafrost and forested areas. Most of the construction sites are located in the frigid regions north of 52 degrees latitude, where the snow cover lasts for over 5 months, and the lowest recorded temperature has reached minus 47 degrees Celsius. As required by the owner and the pipeline authority, 80% of the main welding work must be carried out using CPP900 automatic welding equipment. 　　The development of CPP900 began in 2014, and it consists of three components: the CPP900 dual-torch pipe all-position automatic welding machine, the CPP900 pipe end groove shaping machine, and the CPP900 pipe inner ring seam automatic welding machine. Technology in this field has long been monopolized by foreign countries, and the prices are quite high. Over the course of two years, the research personnel at the Pipeline Bureau equipped the CPP900 with a precise tracking system, as well as digital and bus technologies, thanks to their innovation. These three features enhance the intelligence level of CPP900 and reduce the workload for welders. At the same time, compared with traditional manual welding and CRC fully automatic welding, it offers better weld quality and higher speed, breaking free from the limitations of flat areas. Its successful application has not only promoted the localization of pipeline construction equipment in China, but also provided strong technical and equipment support to accelerate and improve the quality of engineering construction. 　　“CPP900 not only reduces the workload on welders, but also features fast welding speed, stable quality, a high first-pass qualification rate, and is easy to operate. ”Shang Shengnan, the team leader of the CPP307 machine with over 10,000 hours of experience in automatic welding, said, “Under the extremely cold conditions in the Northeast region, the CPP900 performed well. This month, our team has completed more than 8 kilometers of welding work, which is 3 kilometers beyond the planned schedule.” ” 　　It is reported that an important step has been taken toward the industrialization of CPP900. To date, Jianghan Oil Construction has successfully utilized CPP900 automatic welding equipment at 4 stations in the implementation of the Tianjin LNG project, and both the welding speed and quality meet the requirements of the project. Liaohe Oil Construction, which is carrying out secondary construction work in Mohe, also has two units that utilize CPP900 automatic welding equipment at four stations. 　　“The welding time for a single joint using manual semi-automatic welding is approximately 40 minutes, whereas the welding time with the CPP900 is no more than 20 minutes, which greatly improves the speed and quality of construction. Moreover, its welding quality is excellent; the surface of the cover is well-formed, with no undercutting or bulging. The highest number of joints welded in a single day exceeded 71. ”This is what Li Zhao, the team leader at Liaohe Oil Construction, said after trying out the CPP900 automatic welding equipment. (End)