Study on Chemical Corrosion Resistance and Life Cycle Performance Improvement of PE Water Supply Pipes ——Drinking Water Transportation Applications Based on GB/T 13663 Standard

1. Research Background

• Service life <30 years under ClO₂ (vs. 50-year design)
• 0.1mm/h crack growth rate in PE80
• 25% strength decay with recycled materials

2. Core Issue: ClO₂-Induced Degradation

2.1 Oxidation Mechanism

1. Free radical initiation at tertiary carbons
2. Molecular weight loss 15% per 0.1 carbonyl index increase
3. Elongation at break drops from 600% to 120% after 1000h

2.2 Key Parameters

3. Material Modification

3.1 Nano-Composite Enhancement

• CNTs reduce ClO₂ diffusion by 40%
• HALS inhibit radical chain reactions (Figure 2)

3.2 Biaxial Orientation (BOPPE)

4. Service Life Prediction

4.1 Arrhenius-Based Model

• Lifespan drops from 50 to 22 years at ClO₂ 0.5mg/L
• Modified pipes recover to 45 years

4.2 Smart Monitoring System

• Strain (±0.01% accuracy)
• Oxidation products (fluorescence spectroscopy)
• Leak location (±0.5m precision)

5. Engineering Solutions

5.1 Corrosion-Resistant Standard

5.2 Standardized Construction

1. Material test: OIT failure rate <0.5%
2. Joint test: Electrofusion resistance deviation <±5%
3. Pressure test: 1.5× pressure for 4h
4. Environment control: Welding temp 180-220℃, humidity <80%

6. Field Test Case: Water Plant Renovation

7. Advanced Technology Prospects

7.1 Self-Healing Antibacterial Pipe

7.2 Low-Carbon Recycling