Municipal water-pipe selection must consider full life-cycle cost, not just initial material price. Ductile iron pipe is the century-old standard but is heavy and corrosion-prone. Bamboo winding composite pipe, as a newer material, offers advantages in corrosion resistance and light weight. This article compares DN600, 1 km of municipal water pipe over its full lifecycle.
Material and transport cost comparison
| Cost item | Ductile iron | Bamboo winding | Difference |
|---|---|---|---|
| Pipe unit price (CNY/m) | ¥850 | ¥680 | Bamboo 20% lower |
| Diameter | DN600 | DN600 | — |
| Pressure class | PN10 | PN10 | — |
| 1 km pipe material | ¥850,000 | ¥680,000 | Save ¥170,000 |
| Transport cost per truck | ¥12,000 | ¥8,000 | Bamboo 40% lighter |
| Truck trips for 1 km | 15 | 10 | 5 fewer trips |
| 1 km transport total | ¥180,000 | ¥80,000 | Save ¥100,000 |
Installation cost comparison
| Installation item | Ductile iron | Bamboo winding | Reason |
|---|---|---|---|
| Lifting equipment | 25-ton crane | 8-ton crane | Bamboo weight about 1/3 |
| Labor (workdays/100 m) | 12 | 8 | Simpler socket connection |
| Connection type | T-type socket + gasket | Socket + gasket | Similar |
| Installation speed (m/day) | 80–100 | 120–150 | Lighter, faster |
| 1 km installation total | ¥320,000 | ¥180,000 | Save ¥140,000 |
50-year lifecycle cost summary
| Cost phase | Ductile iron | Bamboo winding |
|---|---|---|
| Initial (material + transport + installation) | ¥1,350,000 | ¥940,000 |
| Operation maintenance (50 yr) | ¥280,000 | ¥120,000 |
| Corrosion protection (every 10 yr) | ¥150,000 | ¥0 |
| Replacement (partial at year 30) | ¥200,000 | ¥0 |
| Scrap recovery | -¥80,000 | ¥0 |
| 50-year total | ¥1,900,000 | ¥1,060,000 |
Key analysis
Over 50 years, bamboo winding pipe total cost is about 56% that of ductile iron, saving approximately ¥840,000 per km. Savings come from three areas: initial material and transport saving ¥270,000 (20%), installation saving ¥140,000 (43%), and operational saving ¥430,000 (corrosion protection and partial replacement). However, bamboo winding pipe currently claims a 50-year design life with only about 15 years of actual service history; long-term durability still needs time to verify.
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