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Recently, the \"Intelligent Detector for Cracks in Small Nozzles Using Multiple Magnetic Sources\", developed independently by Anhui Institute of Technology, along with the core detection technology of \"multiple magnetic source coupling + AI-based defect inversion\", has shown remarkable effectiveness in practical applications. By enabling precise detection, it has allowed for the thorough inspection of small nozzles in refining and chemical processing units, thereby providing a technological foundation for the safe and stable operation of these units. The small nozzles in refining and petrochemical plants function like \"capillaries\"; they are not only numerous and complex in structure but also operate under harsh conditions such as high temperatures and pressures. Coupled with limited space, conventional inspection methods often prove ineffective, and any missed tiny cracks can easily lead to safety accidents. Therefore, overcoming these common challenges in this industry has become a key issue for refining and chemical enterprises to ensure safe production. To this end, since 2023, Anhui Institute of Engineering has relied on the scientific research projects of the group company to make \"intelligent detection of small pipe joint defects\" a key focus for research and development. Through continuous efforts, the team managed to overcome the limitations of traditional testing methods. The new technology developed features multiple dimensions of innovation: it has a wider detection range and can be used with pipes of various diameters, from DN8 to DN50 ； It offers higher detection accuracy, enabling the precise identification of micro-cracks as small as 0.5 millimeters ； Detection efficiency has been significantly improved, being 5 times higher than that of traditional ultrasound detection methods ； The application scenario is more user-friendly: there is no need to stop operations for grinding, and online testing can be carried out while the device is in operation, thereby minimizing disruptions to normal production. Recently, the equipment safety monitoring and testing technology R&D team from Anhui Institute of Technology, equipped with this intelligent detector, went to the atmospheric and vacuum distillation units of relevant enterprises to conduct practical testing. In a complex piping environment where the tower top temperature exceeded 100 degrees Celsius, the inspectors managed to identify a millimeter-sized crack at the weld of the pressure gauge outlet line on the atmospheric tower top in less than 10 minutes, successfully preventing potential leakage risks from developing. It is reported that this technology has a wide range of application scenarios, and can meet the inspection needs for various high- and low-temperature pressure pipes, medium drainage pipes, as well as branch small pipes in devices. The successful implementation of this new technology marks a comprehensive improvement in the safety inspection techniques for small connections in refining and petrochemical enterprises. It is understood that once this technology is widely adopted, it is expected to help refining and chemical companies reduce similar safety risks by over 90% each year, thereby providing a solid barrier for the long-term safe and stable operation of such facilities.