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Classification methods and types of underground pipelines. Underground pipelines refer to pipes and cables buried underground, and they can be classified in the following ways: 1. Classification by purpose: (1) Water supply pipes: These include pipes for supplying domestic water, fire-fighting water, and industrial water. (2) Drainage pipes: These include various types of pipes such as rainwater pipes, sewage pipes, combined sewer pipes, and industrial wastewater pipes; in special areas, they also include covers for open ditches or channels that are connected to related engineering projects. (3) Gas pipelines: Include pipelines for coal gas, natural gas, liquefied petroleum gas, and other similar gases. (4) Thermal pipelines: including hot water supply pipelines, heating gas pipelines, water supply pipelines for bathing, etc. (5) Power cables: include power cables, lighting cables, street light cables, and various other types of cables used for transmitting and distributing electricity. (6) Telecommunication cables: include directly buried cables for local calls, long-distance calls, broadcasting, optical fibers, cable television, communications, railways, and various other specialized communication systems. (7) Industrial pipelines: including those for oxygen, ethylene, liquid fuels, heavy oil, and diesel; chemical pipelines for potassium chloride, propylene, methanol, etc.; as well as industrial slag discharge pipelines and ash discharge pipelines. (8) Oil and gas pipelines: including internal gathering and transportation pipelines in oil and gas fields, inter-station pipelines, as well as long-distance pipelines that form regional and national networks. 2. Classification by pipeline material (1) Corrosion-resistant steel pipelines ； (2) Cast iron pipes ； (3) Cement pipes with wire mesh ； (4) Fiberglass reinforced plastic pipes ； (5) Plastic PE pipes, etc. 3. Classification by the professional owner of the pipeline, such as oil production plants, gas production plants, oil transportation companies, gas transportation companies, municipal water supply companies, pipeline gas companies, etc. Classifying by the professional owner helps determine which entity will take the lead in conducting inspections, where the funding will come from, who will be responsible, and which entity will own the results of the inspections.