PVC-U pipes are widely used in both water supply and drainage systems, yet they exhibit significant differences in design standards, performance requirements, and application scenarios. The following comparative analysis helps users quickly understand the core distinctions:

1. Function and Pressure Rating

 

Water Supply Pipes:

• Used for pressure-bearing transportation of drinking water or domestic water, requiring long-term stable operation.

• Designed with clear pressure ratings (e.g., 0.6MPa, 1.0MPa), featuring thicker walls and strong internal pressure resistance.

Drainage Pipes:

• Rely on gravity flow to discharge sewage and rainwater, bearing no or only low pressure.

• Thinner walls, no pressure rating requirements, but must ensure flow velocity and anti-clogging capability.

 

2. Materials and Hygiene Standards

 

Water Supply Pipes:

• Made from high-purity PVC resin + non-toxic additives, complying with the "GB/T 10002.1-2023" hygiene standard.

• Smooth inner walls with no chemical leaching, ensuring drinking water safety.

Drainage Pipes:

• Use ordinary PVC resin, which may contain recycled materials (permitted by "GB/T 5836.1-2018"), with no hygiene requirements.

• Focus on corrosion resistance to handle acidic/alkaline wastewater or domestic sewage.

 

3. Connection and Sealing Methods

Water Supply Pipes:

• Socket adhesive bonding or rubber ring seals, requiring zero leakage.

• Joints must undergo pressure tests (e.g., 1.5 times working pressure holding test).

Drainage Pipes:

• Primarily adhesive bonding, with rubber ring flexible joints for larger pipes.

• Emphasis on construction efficiency, with lower sealing requirements than water supply pipes.

 

 

4. Application Scenarios and Lifespan

 

Water Supply Pipes:

• Civil water supply, municipal networks, irrigation systems, with a design lifespan of ≥50 years.

• Strictly prohibited from mixing with drainage pipes, and must be laid away from light to prevent algae growth.

Drainage Pipes:

• Building drainage, municipal sewage, rainwater collection, with a lifespan of 30-50 years.

• Must consider chemical corrosion resistance and impact strength (e.g., underground burial load).

5. Selection and Installation Guidelines

Water Supply Pipes:

• Look for the "Drinking Water Safety Certification" mark (e.g., NSF, GB/T 17219).

•Avoid sharing construction tools with drainage pipes to prevent cross-contamination.

 

Drainage Pipes:

• Focus on ring stiffness (e.g., SN4/SN8) to handle buried loads, and sloped design to ensure drainage efficiency.

• Prevent brittleness during winter construction, and use specialized fittings for bends.

Summary

Aspect	PVC-U Water Supply Pipes	PVC-U Drainage Pipes
Core Function	Pressure water supply, ensuring drinking water safety	Gravity drainage, efficient sewage disposal
Hygiene Requirements	Non-toxic, strictly tested	No potable-grade requirements
Pressure Capacity	Clear pressure ratings, thick-walled design	Non-pressure or low-pressure, thin-walled and lightweight
Standards	GB/T 10002.1, CJ/T 272	GB/T 5836.1, CJ/T 295

 

 

Why Choose ULP for PVC-U Water Plumbing System Solutions?

 

Sourcing PVC-U Water Plumbing System is not just about buying products—it's about choosing a partner that understands your project needs.

ULP is a provider of pipe systems, conduit accessories, and one-stop piping solutions, trusted by buyers worldwide.

 

Here's why ULP stands out:

✅ 15+ Years of Experience: Proven track record in manufacturing and supplying conduit and fittings.

✅ OEM/ODM Services: Customize logos, colors, sizes, and packaging to meet project or branding needs.

✅ Competitive Pricing: Cost-effective solutions without compromising on quality.

✅ Comprehensive Product Range: From plastic conduit to metal conduit fittings, ULP covers all your installation needs.

✅ Reliable Service: Reliable logistics and responsive customer service ensure timely delivery.

 

When choosing PVC Water Plumbing System, working with ULP means you get quality assurance, flexibility, and long-term value.

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