Threaded pipe refers to a special type of steel pipe with spiral projections or grooves machined into the inner and outer surfaces. By modifying the pipe structure, it optimizes fluid flow or enhances heat transfer efficiency. It is widely used in the petrochemical, HVAC, and water supply and drainage industries, offering both convenient connection and enhanced functionality, making it a significant upgrade to traditional smooth pipe.

Depending on its structure and application, threaded pipe is primarily divided into two categories: First, threaded pipe for connection, with external or internal threads machined into the pipe ends, can be connected to fittings without the need for additional flanges. Examples include galvanized threaded pipe in water supply and drainage systems, offering easy installation and suitable for small and medium-diameter pipes. Second, threaded pipe for heat exchange, with spiral patterns on both the inner and outer surfaces, such as low-rib threaded pipe in boilers and heat exchangers. This increases heat transfer area and disrupts the fluid boundary layer, improving heat transfer efficiency and achieving a 30%-50% higher heat transfer coefficient than ordinary smooth pipe. Threaded pipes offer two key advantages: First, they offer efficient and flexible connections. Threaded connections eliminate the need for welding and allow for quick assembly and disassembly, making them particularly suitable for piping systems requiring maintenance or modification, such as indoor water supply and drainage branches in buildings and temporary water pipes for equipment. Second, they offer targeted performance enhancements. Threaded pipes for heat exchange improve heat transfer efficiency through structural design, reducing equipment size and energy consumption. For example, threaded pipes in air conditioner condensers can reduce heat exchanger size and lower operating power consumption. Threaded pipes for transport applications utilize internal threads to minimize fluid retention and reduce the risk of scaling.

In practical applications, they are highly efficient components for home heating. Thin-walled threaded pipes in floor heating systems offer convenient connections, and the internal threads facilitate uniform hot water flow. They are energy-saving tools for chemical heat exchange. Threaded pipe heat exchangers used in reactors can quickly cool or heat materials. They are also a practical option for small-scale oil transportation. Small-diameter threaded pipes at oilfield wellheads can be flexibly connected to oil branch pipes, facilitating adjustments to wellhead operations. With the growing demand for energy conservation, threaded pipes are evolving towards more optimized structures and wider adaptability.