What are the main characteristics of HDPE pipes?

HDPE pipes have a relatively high density compared to other polyethylene pipes. This gives them excellent strength and rigidity, enabling them to withstand high internal pressures. For example, they can handle pressures ranging from a few bars to well over 10 bars, depending on the pipe's diameter and wall thickness. This makes them suitable for applications such as water supply and gas distribution where maintaining pressure integrity is crucial.

HDPE is highly resistant to corrosion. It is not affected by most chemicals, acids, and alkalis that would quickly corrode metal pipes. For instance, in a sewerage system where the pipe is constantly exposed to a wide range of corrosive substances in wastewater, HDPE pipes can maintain their integrity over a long period. They also do not rust like iron or steel pipes, which can lead to the deterioration of the pipe structure and potential leaks.

HDPE pipes are flexible, which is a significant advantage. They can be bent to a certain extent without kinking or breaking. This flexibility allows them to follow the contours of the ground during installation, reducing the need for complex jointing and fittings in uneven terrains. In areas prone to ground settlement or earthquakes, the flexibility of HDPE pipes helps them to adapt to the movement without cracking, minimizing the risk of leaks.

HDPE pipes have a long service life. Under normal conditions, they can last for several decades. Their resistance to environmental degradation factors such as UV radiation (when properly protected or colored), chemicals, and abrasion contribute to their durability. For example, in an irrigation system buried underground, an HDPE pipe can serve for 50 years or more, providing a reliable means of water transportation throughout its lifespan.

The inner surface of HDPE pipes is smooth. This smoothness reduces the frictional resistance to fluid flow. As a result, there is less energy loss during the transportation of fluids such as water or gas. In a water supply system, this means that pumps can operate more efficiently, consuming less energy to maintain the desired flow rate.

HDPE pipes have excellent leak - resistance properties. The joints between HDPE pipes can be made using heat - fusion welding, which creates a seamless and strong connection. This welding process ensures that there are no gaps or weak points where leaks are likely to occur. Compared to traditional pipe - joining methods such as mechanical couplings for metal pipes, the heat - fusion - welded joints of HDPE pipes provide a more reliable seal.

HDPE pipes are lightweight compared to metal pipes of the same diameter and strength. This makes them easier to handle and transport during installation. For example, a large - diameter HDPE pipe can be easily carried and installed by a small crew using simple equipment, while a similar - sized metal pipe would require heavy - lifting machinery and more labor - intensive installation procedures.