What are the specifications for HDPE pipe for water supply?

High-Density Polyethylene (HDPE) pipes are commonly used for water supply due to their durability, flexibility, and resistance to corrosion. Here are the typical specifications for HDPE pipes used in water supply applications:

Material:

HDPE pipes are made from high-density polyethylene, a thermoplastic polymer known for its high strength-to-density ratio.

Size Range:

HDPE pipes for water supply are available in a range of sizes, typically ranging from 20mm to 1200mm in diameter. The size selection depends on the specific requirements of the water supply system.

Pressure Rating:

HDPE pipes are classified based on their pressure rating, which is the maximum pressure the pipe can withstand. Common pressure ratings include PN6, PN8, PN10, PN12.5, PN16, PN20, and PN25. The selection of pressure rating depends on the water supply system's design pressure.

Color:

HDPE pipes for water supply are often produced in black color. However, they may also come in other colors, such as blue, to distinguish them for specific applications like potable water.

Standards Compliance:

HDPE water pipes should comply with relevant international or national standards. Common standards include ISO 4427 for water supply piping systems and ASTM D3035 for polyethylene pipes.

Density:

The density of HDPE used for water supply pipes is typically in the range of 0.941-0.965 g/cm³. This property contributes to the material's lightweight nature and ease of handling during installation.

Flexibility:

HDPE pipes exhibit high flexibility, allowing them to adapt to the terrain during installation. This flexibility is especially beneficial in areas prone to ground movement.

Jointing Methods:

HDPE pipes can be joined using various methods, including butt fusion, electrofusion, and mechanical fittings. Butt fusion is a common method for larger diameter pipes, providing a seamless and leak-free joint.

Resistance to Chemicals:

HDPE pipes are resistant to a wide range of chemicals, making them suitable for conveying different types of water, including treated and untreated water.

UV Resistance:

HDPE pipes are generally resistant to ultraviolet (UV) radiation, which makes them suitable for above-ground and exposed installations. However, for prolonged exposure, manufacturers may add UV stabilizers to enhance resistance.

Longevity:

HDPE pipes have a long service life, often exceeding 50 years when properly installed and maintained. This longevity contributes to the cost-effectiveness of HDPE as a water supply pipe material.

Hydraulic Performance:

HDPE pipes offer smooth inner surfaces, reducing friction and ensuring efficient water flow. The hydraulic characteristics of HDPE pipes contribute to their suitability for water supply systems.

When selecting HDPE pipes for water supply, it is essential to consult the specific requirements of the project and adhere to local regulations and standards to ensure the proper performance and longevity of the water supply system.