Pipe Material Selection and Key Construction Points for Municipal Pipeline Network Systems

Municipal pipeline networks are responsible for transporting various media and fluids. Different types of steel pipes—distinguished by their varying pressure-bearing capacities and sealing performance—are suited to diverse engineering applications such as water supply, drainage, and process fluid transport, ensuring the long-term, stable operation of the network.

Carbon steel pipes offer balanced mechanical properties and ease of processing (such as cutting and welding); they are widely used for low-pressure water supply and drainage lines as well as structural supports, capable of withstanding standard fluid pressures and meeting general municipal requirements. Stainless steel pipes feature excellent corrosion resistance, making them ideal for transporting purified water or food-grade media; their smooth inner walls resist scaling and prevent contamination of the transported fluid, thereby reducing the frequency of cleaning and maintenance. Galvanized steel pipes feature a protective zinc coating and are commonly used for indoor water supply, drainage, and fire-protection lines, where the coating inhibits rust and extends the pipeline's service life.

Seamless steel pipes are manufactured using an integral extrusion process; lacking longitudinal welds, they offer superior pressure-bearing capacity. They are widely used for high-pressure fluid transport, as they can withstand the impact of high-pressure internal media and minimize the risk of leakage. Welded steel pipes are formed by rolling and welding steel plates; available in a wide range of specifications and offering cost advantages, they are suitable for laying long-distance pipelines with lower pressure ratings. Specialized oil-well piping is designed for complex downhole conditions, capable of withstanding formation pressure and corrosive media, and is used to construct wellbores for oil and gas extraction.

Hollow structural sections (HSS) feature non-circular cross-sections, such as squares or rectangles; beyond fluid transport, they are extensively used for network support brackets and pipe gallery structures. Pipe fittings—including components like elbows, tees, and flanges—facilitate changes in direction, branching, and connections, ensuring the pipeline network remains securely sealed and reliably interconnected.

During pipeline network construction, pipe selection is based on factors such as fluid pressure, media composition, and the burial environment; buried pipes are equipped with external anti-corrosion coatings, while overhead lines receive thermal insulation and protection. Steel pipes can be joined using various methods—such as welding, flanges, or mechanical couplings—to suit the specific requirements of different construction sites. The pipes offer high strength and superior resistance to deformation caused by ground settlement compared to many non-metallic alternatives; with a reliable service life, they are a primary choice for municipal pipeline network projects.