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As a leading manufacturer established in 2010, Qingdao Yongke Machinery leverages over a decade of expertise and a sprawling 10,000-30,000 sqm factory to produce premium HDPE Corrugated Sewer Pipes, commonly known as Krah pipes. Our pipes are engineered for superior performance in demanding sewer and drainage applications, offering a robust, cost-effective, and long-lasting solution for municipal and industrial infrastructure projects worldwide.
Our HDPE Corrugated Sewer Pipe is designed with a unique double-wall structure that combines a smooth inner liner for optimal flow characteristics with a corrugated outer wall for exceptional strength and ring stiffness. This innovative design provides significant advantages over traditional piping materials.
Core Product Features & Technical Advantages:
Superior Durability & Longevity: Made from high-quality, virgin HDPE resin, our pipes exhibit excellent resistance to abrasion, chemical attack from sewer gases and effluents, and environmental stress cracking. They are inherently corrosion-proof, ensuring a service life that can exceed 100 years under normal conditions.
High Structural Strength with Lightweight Design: The corrugated profile provides high ring stiffness (SN values from 4 to 16) to withstand substantial earth loads and traffic loads, while the material's lightness simplifies handling, transportation, and installation, significantly reducing labor costs and time.
Excellent Hydraulic Performance: The smooth inner surface minimizes friction (Hazen-Williams coefficient C=150), promoting efficient flow, reducing the risk of blockages, and allowing for the use of smaller diameters compared to concrete or clay pipes for equivalent flow capacity.
Flexibility and Leak-Free Joints: HDPE's flexibility allows the pipe to withstand ground movement and settlement without cracking. Combined with our reliable jointing systems—butt fusion, electrofusion, or bell and spigot with integrated EPDM gaskets—we ensure a continuous, leak-proof pipeline system, protecting groundwater from contamination.
Cost-Effective Lifecycle Solution: While the initial material cost is competitive, the real savings come from lower installation costs (no need for heavy machinery or concrete bedding), minimal maintenance, and the avoidance of rehabilitation costs over its extended lifespan.
Environmental Sustainability: HDPE is a recyclable material. Our manufacturing processes adhere to ISO 14000 environmental management standards, contributing to greener infrastructure development.
Typical Technical Specifications:
| Parameter | Specification / Range |
| Material | High-Density Polyethylene (HDPE) PE100/PE80 |
| Standard Diameter (OD) | 200mm, 250mm, 315mm, 400mm, 500mm, 630mm, 800mm, 1000mm, 1200mm+ |
| Standard Length | 6 meters or 12 meters (custom lengths available) |
| Ring Stiffness (SN) | SN4, SN8, SN12, SN16 (as per project requirements) |
| Color | Black (standard), with blue or other color stripes for identification optional |
| Connection Methods | Butt Fusion, Electrofusion, Bell & Spigot with EPDM Gasket |
| Operating Temperature Range | -40°C to +60°C |
Application Areas:
Municipal Sewer Systems: Gravity sewers, house connections, trunk mains.
Stormwater & Drainage: Culverts, land drainage, highway drainage, retention systems.
Industrial Effluent Lines: Chemical and process water drainage.
Landfill Leachate Collection: Due to its excellent chemical resistance.
Agricultural Drainage: Subsurface field drainage pipes.
Frequently Asked Questions (FAQ):
Q1: What is the main advantage of HDPE corrugated pipe over concrete or PVC pipes?
A1: HDPE corrugated pipe offers a superior combination of flexibility, chemical resistance, and joint integrity. It is lighter for easier installation, immune to corrosion, and its fused joints create a monolithic, leak-proof system, unlike the potential for leakage in concrete segment joints.
Q2: How do I determine the required ring stiffness (SN value) for my project?
A2: The SN rating depends on the depth of burial, soil type, and surface loads (e.g., traffic). Our technical team can assist with calculations based on your project's geotechnical report. Common ratings are SN4 for shallow burial and SN8/SN12 for deeper or heavily loaded applications.
Q3: Can your pipes be used for potable water applications?
A3: While our standard pipe is formulated for sewer and drainage, we can produce pipes from certified HDPE compounds suitable for potable water upon request, subject to relevant local and international drinking water standards.
Q4: What jointing methods do you recommend, and what equipment is needed?
A4: For diameters above 400mm, butt fusion is highly recommended for its strength and leak-proof guarantee, requiring a hydraulic fusion machine. For smaller diameters or repair scenarios, electrofusion couplings are efficient. Bell and spigot joints with gaskets are suitable for non-pressurized gravity flow and allow for some angular deflection.
Q5: Do you provide custom diameters and lengths?
A5: Yes. As a manufacturer with advanced extrusion lines, we can produce pipes in diameters from 200mm up to 3000mm and in lengths tailored to your logistical or installation needs, subject to minimum order quantities.
Q6: What is your production capacity and lead time?
A6: With our large-scale factory and over 50-100 skilled employees, we have significant production capacity. Standard diameter lead times are competitive, while custom projects require consultation. We export over US$1-1.5 million annually, ensuring reliable and timely delivery.
Q7: What certifications do your products have?
A7: Our manufacturing quality system is certified to ISO 9001. We also hold ISO 14000 for environmental management and OHSAS 18001 for occupational health and safety. Product-specific certifications can be discussed based on your market requirements.
Q8: What are your main export markets, and do you offer technical support?
A8: We have extensive experience exporting to North and South America, Europe, Asia, Africa, and Oceania. Our technical team provides comprehensive support, including installation guidance, project design consultation, and on-site training if required.
Backed by our ISO 9001 certified manufacturing processes and a dedicated workforce of 51-100 people, Qingdao Yongke Machinery delivers HDPE Corrugated Sewer Pipes that combine proven engineering with rigorous quality control. Our global reach, serving markets from North America to Southeast Asia and Europe, is a testament to the reliability and performance of our products. We invite you to leverage our manufacturing strength and technical expertise for your next infrastructure project. Contact us today for a detailed quotation, technical data sheets, or to discuss your specific requirements.
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