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Properly manufactured and qualified plastic sewage pipes generally have a theoretical design lifespan of over 50 years. However, their actual lifespan varies depending on the material, application environment, and maintenance practices. The specific lifespans for various commonly used materials are as follows: 1. PVC pipes: Qualified PVC-U pipes intended for drainage purposes can, when used properly in non-exposed underground environments, have a design lifespan of up to 50 years； The lifespan of ordinary PVC corrugated pipes is approximately 30–50 years. Industry sources also mention a theoretical upper limit, stating that the lifespan of PVC pipes can reach 50–70 years; however, in practical engineering applications, a design lifespan of 50 years is generally adopted. 2. PE (polyethylene) pipes: High-density polyethylene (HDPE) pipes – in underground sewage systems, their designed service life can exceed 50 years; high-quality products can have a theoretical service life of 50–100 years. Actual service life by application: Building indoor sewage systems generally last 20–50 years, while municipal buried sewage pipelines last 30–60 years ； When transporting corrosive industrial wastewater, the lifespan is reduced to 15-40 years. Key factors affecting actual lifespan: Usage environment: Prolonged exposure to ultraviolet rays accelerates aging; use in underground or indoor areas results in greater stability ； Acidic/alkaline soils and high groundwater levels can also accelerate aging. Installation and maintenance: Proper installation can prevent damage to the pipes, while regular cleaning of the pipes and internal inspection can reduce wear and erosion, thereby extending their actual service life. Product quality: Pipes manufactured by reputable large manufacturers using high-quality materials exhibit far superior aging resistance and structural stability compared to the inferior products made by smaller factories, ensuring a longer service life.