What are the classes of HDPE pipes? Classification of HDPE pipes

HDPE (High-Density Polyethylene) pipes are classified based on their material properties, pressure ratings, and specific applications. Here are the main classes of HDPE pipes:

1. Material-Based Classification

PE63: This is an older grade with lower strength and is less commonly used today.

PE80: A medium-strength grade used for various applications including gas and water supply.

PE100: The highest strength grade, offering the best performance in terms of pressure resistance and longevity, widely used for gas, water supply, and industrial applications.

2. Pressure Rating (PN Rating)

HDPE pipes are often classified by their pressure rating, which is designated by PN (Pressure Nominal). Common PN ratings include:

PN4: Suitable for low-pressure applications.

PN6: Used for moderate pressure applications.

PN10: Often used in standard water distribution.

PN12.5: Suitable for higher pressure applications.

PN16: Used for high-pressure systems.

PN20 and PN25: For very high-pressure systems.

3. Wall Thickness and SDR Classification

HDPE pipes are also classified by their wall thickness, often indicated by SDR (Standard Dimension Ratio). The SDR is the ratio of the pipe diameter to its wall thickness. Common SDR values include:

SDR11: Thicker walls, suitable for high-pressure applications.

SDR17: Thinner walls compared to SDR11, used for moderate pressures.

SDR21: Even thinner walls, suitable for lower pressure applications.

SDR26: Thinnest among common SDR ratings, used for the lowest pressure requirements.

4. Application-Based Classification

Water Supply: HDPE pipes used for potable water supply must comply with stringent health standards.

Gas Distribution: These pipes are designed to handle the specific demands of transporting natural gas, including resistance to environmental stress and leaks.

Sewerage Systems: HDPE pipes for sewerage are typically designed to resist chemicals and abrasion.

Industrial Applications: These include pipes used in mining, dredging, and other industrial processes that require high durability and chemical resistance.

5. Additional Classifications

Perforated HDPE Pipes: Used in drainage systems where water needs to be filtered out of the soil.

Double-Walled Corrugated HDPE Pipes: Used for underground sewerage and drainage systems, offering high durability and resistance to external pressure.

6. Summary

HDPE pipes are classified based on material grade (PE63, PE80, PE100), pressure rating (PN4, PN6, PN10, PN16, etc.), wall thickness (SDR11, SDR17, SDR21, SDR26), application (water supply, gas distribution, sewerage, industrial uses), and additional structural features like perforations and double-walled designs.

7. About Us

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