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

Mar 22, 2025 / Post by by 孙飞虎

1. Research Background

PE water pipes occupy 35% of global drinking water markets (2024 Global Market Insights), but face three challenges from ClO₂ disinfection:

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

FTIR and GPC analysis (Figure 1) reveal three-stage degradation:

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

2.2 Key Parameters

Parameter	GB Requirement	Corrosion-Induced Decay
Elongation at break (%)	≥350	8-12% annual loss
SCG resistance (h)	≥100 (PE100)	Reduced to 45h
OIT (min)	≥20	Reduced to 8min

3. Material Modification

3.1 Nano-Composite Enhancement

"CNT + HALS" modification:

Modification	OIT (min)	Tensile Strength Retention after 1000h ClO₂ Aging (%)
Regular PE100	22	68
Nano-PE	35	89

Breakthroughs:

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

3.2 Biaxial Orientation (BOPPE)

MDO technology vs. regular PE100:

Pipe Type	Hoop Strength (MPa)	Hydrostatic Strength (MPa)	SCG Resistance (h)
Regular PE100	25	1.6	120
BOPPE	32	2.2	280

4. Service Life Prediction

4.1 Arrhenius-Based Model

Multi-factor model predicts lifespan under different ClO₂ concentrations (Figure 3):

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

4.2 Smart Monitoring System

Fiber Bragg grating sensors monitor:

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

5. Engineering Solutions

5.1 Corrosion-Resistant Standard

Revised GB/T 13663-2023 requirements:

Parameter	GB Requirement	Corrosion Environment Standard	Test Method
OIT (min)	≥20	≥30	ISO 11357-6
ClO₂ aging retention	-	≥85% tensile strength	Immersion + 力学测试
Recycled content (%)	≤10	≤5	FTIR quantitative analysis

5.2 Standardized Construction

"Three Inspections One Control" process:

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

6. Field Test Case: Water Plant Renovation

Index	Regular PE100	Modified BOPPE	Standard Requirement
Post-5-year OIT (min)	12	28	≥20
Leakage rate (times/km·year)	1.8	0.3	≤1.0
Cost (¥/m)	150	180	-

7. Advanced Technology Prospects

7.1 Self-Healing Antibacterial Pipe

Microcapsules + nano-silver enable 0.3mm crack repair and 99.9% bacteriostasis.

7.2 Low-Carbon Recycling

Chemical depolymerization achieves 98% recycling rate and 45% carbon reduction.

Conclusion
This paper establishes a corrosion-resistant system for PE pipes through nano-modification + biaxial orientation + life prediction. As a professional supplier, we provide:
✅ ClO₂-resistant PE pipes (DN20-DN1200mm)
✅ Drinking water safety certification
✅ Life cycle performance assessment

Keywords: PE water pipe, chlorine dioxide corrosion, nano-modification, life prediction, GB/T 13663

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