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Based on the purpose, characteristics, and regulatory framework of pressure pipelines, the \"Catalogue of Special Equipment\" classifies them into three categories: long-distance pipelines (GA), utility pipelines (GB), and industrial pipelines (GC). 1. Long-distance pipelines (GA) refer to pressure pipelines used for transporting gases or liquids such as natural gas and crude oil over long distances between production sites, storage facilities, and users, within cities; they are also known as long-distance (oil and gas) pipelines. Based on the medium transported by pressure pipelines, the \"Catalogue of Special Equipment\" classifies long-distance pipelines into two types of pressure pipelines: oil pipelines and gas pipelines. Long-distance pipelines are classified according to their risk level into GA1 long-distance pipelines with a design pressure greater than 4.0 MPa, and GA2 long-distance pipelines that are not of the GA1 category. 2. Utility pipelines (GB) refer to pressure pipelines used for the supply of town gas and heat for public services or domestic use within cities or towns. Based on the medium transported by pressure pipelines, the \"Catalogue of Special Equipment\" classifies them into two types of pressure pipelines: gas pipelines (GB1) and thermal pipelines (GB2). (1) Gas pipelines (GB1) refer to urban gas pipelines that transport gases such as natural gas and liquefied petroleum gas for use by residential, commercial, and industrial customers. (2) Thermal pipelines (GB2) refer to urban thermal pipelines that transport heat carriers such as hot water or steam, providing thermal energy for urban heating and industrial production systems. 3. Industrial pipes (GC category) refer to the pipes used within enterprises and institutions for transporting process media, utility media, and other auxiliary media. The “Catalogue of Special Equipment” classifies them into three types of pressure pipelines: process pipelines, refrigeration pipelines, and power pipelines. (1) Process pipelines refer to pressure pipeline systems used in the field of industrial production to meet specific process requirements, and which are connected together to transport various process media with certain safety risks (such as gases, liquefied gases, liquids, etc.). (2) Refrigeration pipes refer to the pipeline network used in a refrigeration system to transport refrigerants such as Freon and ammonia. They connect devices like compressors, condensers, and evaporators, forming a closed circulation loop that enables the circulation of the refrigerant and heat exchange. (3) Power pipelines refer to the pressure pipeline systems within a power plant, within the area of the station boiler and outside the four main pipelines, which are used to transport steam, high-temperature water, and steam-water mixtures for power generation. Industrial pipelines are classified by risk level into: GC1 class pipelines, GC2 class pipelines, and GCD class power pipelines.