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Urban underground pipeline networks include pipes for gas, water supply, sewage, heating, etc.; corrosion of these pipelines causes significant damage each year. Firstly, corrosion products cause secondary pollution of water quality; secondly, leaks increase; and thirdly, the flow cross-section of the pipeline network decreases along with increased friction, which affects the water supply capacity. In recent years, an average of 100,000 units have been renovated each year. A large portion of the existing buried pipeline networks has reached the end of its service life, and punctures or leaks are inevitable; traditional solutions involve digging to carry out repairs or replacing the pipelines. Some of the old pipeline networks are located beneath urban main roads or at the edges of structures, making repairs or replacements more difficult. Against this backdrop, the \"rotating airflow method\" can be considered a revolutionary new technology for anti-corrosion protection of buried pipelines without excavation, representing a way to renovate existing underground pipe networks without digging. Combined with internal anti-corrosion technology, this method features strong applicability on-site, significant anti-corrosion effects, and outstanding economic benefits, thereby eliminating the safety and environmental hazards associated with pipeline leaks caused by internal corrosion. This technology is hailed as a world-leading technology that is \"revolutionary, groundbreaking, and explosive\" in nature. The image below shows the crude oil intake pipeline Dn300 in a petrochemical tank farm, a crude oil pipeline over 1,000 meters in length, for which the \"rotating air flow method\" – a trenchless technology – was used, showing the process from metal surface preparation to the completion of coating application.