Polyethylene (PE) pipes are widely used in municipal water supply, drainage systems, gas distribution, agricultural irrigation, and industrial pipelines due to their corrosion resistance, pressure resistance, low-temperature performance, and ease of installation. Although they are all called PE pipes, the production process, material selection, and structural design vary significantly depending on the intended application. This article explains the differences in manufacturing, materials, and classification of PE pipes.
Differences in Manufacturing Process
The production process of PE pipes determines their performance and suitability for specific applications:
1. Water Supply PE Pipes
Manufactured using extrusion molding, ensuring uniform wall thickness and smooth internal surfaces for efficient water flow.
Pipes undergo hydrostatic and burst pressure testing*to guarantee safety under high pressure.
2. Drainage and Sewage PE Pipes
Often produced using extrusion combined with shaping, with some products using dual-layer co-extrusion.
Emphasis on ring stiffness and impact resistance for underground installation.
Outer walls may be corrugated or structured to reduce material usage while maintaining strength.
3. Gas PE Pipes
High requirements for airtightness and welding quality.
Typically yellow or black with yellow stripes, containing additives to resist slow crack growth (SCG) and rapid crack propagation (RCP).
Production tolerances and sealing quality are stricter than for water pipes.
4. Agricultural Irrigation PE Pipes
Lightweight and flexible, often with thinner walls for ease of installation and mobility.
Some products, such as drip irrigation pipes, require perforation or embedded drippers during production, involving specialized processes.
Differences in Material
The raw material of PE pipes directly affects strength, service life, and safety. Material requirements vary by application:
1. Water Supply Pipes
Must use 100% virgin PE100 or PE80.
Recycled material is strictly prohibited to meet drinking water standards.
2. Drainage Pipes
Drinking water standards are not required.
Partial recycled materials can be used if mechanical strength and pressure resistance are maintained.
3. Gas Pipes
Must use 100% virgin gas-grade PE100.
Contain antioxidants and stabilizers to ensure long-term safety.
4. Agricultural Irrigation Pipes
Can use virgin material or a blend of recycled materials depending on cost and expected service life.
Flexibility and UV resistance are key considerations.
Classification by Application
Based on intended use, PE pipes can be classified as follows:
1. Water Supply Pipes
Used in municipal and building water supply systems.
Require pressure resistance and hygienic standards.
2. Gas Pipes
Used for natural gas or liquefied gas distribution.
High requirements for airtightness and crack resistance.
3. Drainage and Sewage Pipes
Used for municipal drainage, industrial sewage, and agricultural runoff.
Require corrosion resistance, impact resistance, and compressive strength.
4. Agricultural Irrigation Pipes
Includes sprinklers, drip irrigation, and micro-irrigation pipes.
Emphasis on lightweight, flexibility, and UV resistance.
5. Power and Communication Conduits
Such as PE cable conduits or MPP pipes.
Protect electrical and communication cables.
6. Industrial Special Pipes
Used for chemical fluid transport, mining pipelines, or other industrial purposes.
Require high corrosion and temperature resistance.
Although all are PE pipes, differences in manufacturing process, material selection, and structural design make each type suitable for specific applications. Proper selection ensures longer service life, safe media transport, and stable system performance.
Designers and contractors should choose the appropriate PE pipe based on intended use and strictly follow production and material standards to ensure quality and safety in engineering projects.
