Buried pipelines or indoor pipelines
1. Municipal engineering:
Pipelines for urban water supply, fire protection, gas, and natural gas transportation.
2. Industrial Engineering:
Process pipes and discharge pipes for conveying corrosive gases, liquids, and solid powders in food and medicine, petrochemical thermal and electrical engineering, metallurgy and mining.
3. Agricultural and forestry irrigation:
Water pipelines for agricultural irrigation and landscaping.
4. Highway:
Underground drainage pipes and conduits for transporting wires and cables.
5. Ocean Engineering:
Seawater transportation, submarine pipelines, and optical (electrical) cable conduits, etc.