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Qingdao Yongke Machinery Co., Ltd. has been a dedicated manufacturer of plastic pipe extrusion equipment since 2010. Our HDPE Plastic Hollow Wall Spiral Krah Pipe Making Machine is specifically engineered for producing high-performance spiral-wound pipes used in sewage water treatment and municipal drainage systems. With a factory spanning over 10,000 square meters and a skilled team of 51–100 employees, we combine precision engineering with practical innovation to deliver reliable, cost-effective production lines. This machine stands out for its robust construction, energy efficiency, and ability to produce pipes with exceptional ring stiffness and long service life, meeting the demanding requirements of modern wastewater infrastructure.
The Krah pipe technology employs a continuous spiral winding process that creates a hollow wall structure, reducing material usage while maintaining high strength-to-weight ratio. Our machine is designed for uninterrupted operation and can be customized to produce pipes with diameters ranging from 200 mm up to 1200 mm. The extruder, die head, winding unit, cooling system, and cutting station are all integrated into a synchronized line, ensuring consistent product quality and minimal waste. Below you will find the key technical specifications and operational features.
Key Technical Specifications
| Parameter | Value / Range |
|---|---|
| Pipe Outer Diameter | 200 mm – 1200 mm |
| Wall Structure | Hollow wall spiral (Krah type) |
| Main Extruder | Single screw, 65 mm – 120 mm screw diameter |
| Output Capacity | Approx. 150 – 500 kg/hr (depending on pipe size) |
| Line Speed | 0.5 – 3 m/min (adjustable) |
| Total Installed Power | 120 kW – 250 kW (configurable) |
| Cooling Method | Spray cooling tank + vacuum calibration |
| Cutting Method | Automatic planetary cutter or saw cutter |
Product Features & Customer Benefits
- High Ring Stiffness (SN ≥ 8 kN/m²) – The hollow wall spiral design provides excellent resistance to soil and traffic loads, making the pipes ideal for deep burial applications in sewage treatment plants.
- Material Savings – Compared to solid wall pipes, the hollow structure reduces HDPE consumption by up to 30%, lowering raw material costs for your production.
- Corrosion & Chemical Resistance – HDPE is inherently resistant to acids, alkalis, and corrosive sewage elements, ensuring a service life of 50+ years in underground environments.
- Smooth Inner Surface – The spiral winding process creates a smooth internal bore, minimizing friction losses and reducing the risk of clogging in wastewater flow.
- Flexible Diameter Change – By adjusting the winding mandrel and die, the same machine can produce different diameters within the specified range, allowing quick product changeovers.
- Low Maintenance – All critical components (extruder, gearbox, winding head) are built with high-grade steel and equipped with centralized lubrication, reducing downtime.
- Energy Efficient Drive System – AC variable frequency drives on main motors optimize power consumption, lowering your overall operational cost.
- User-Friendly Control – PLC with touchscreen interface provides real-time monitoring of temperature, speed, and torque; alarm functions ensure stable production.
Trust & Reliability from Qingdao Yongke
Since our establishment in 2010, Qingdao Yongke Machinery has delivered pipe extrusion solutions to clients across North America, South America, Eastern Europe, Southeast Asia, Africa, Oceania, the Middle East, and many other regions. Our annual export value of US$1 million to US$1.5 million reflects the trust international customers place in our equipment. We hold ISO9001, ISO14001, and OHSAS18001 certifications, confirming our commitment to quality management, environmental responsibility, and occupational health safety. Every machine undergoes rigorous factory testing before shipment from Qingdao Port. We also provide on-site installation guidance, operator training, and a standard 12-month warranty. By choosing our HDPE Krah pipe making machine, you invest in a production line that combines proven technology with dedicated after-sales support.
Frequently Asked Questions (FAQ)
-
Q: What raw materials can be used with this machine?
A: The machine is designed primarily for HDPE (PE80 or PE100) pellets. Recycled HDPE can also be used for inner layers, subject to quality testing. We recommend using virgin material for the outer skin to ensure surface quality. -
Q: What is the typical wall thickness for sewage pipes produced?
A: Wall thickness depends on the required ring stiffness class (SN2, SN4, SN8, etc.). Typically, for a 600 mm diameter pipe at SN8, the wall thickness is around 25–35 mm. We provide detailed calculation guides upon request. -
Q: How long does it take to install and commission the line?
A: For a standard line, installation and commissioning usually take 15–20 working days with our engineer on site. We also offer remote video guidance if on-site service is not required. -
Q: Can the machine produce pipes with bell-and-spigot ends?
A: Yes, an optional belling unit can be integrated to form integral bell sockets at the pipe ends. Please specify this requirement when placing the order. -
Q: What is the power supply requirement?
A: The standard configuration is 380V, 50Hz, 3-phase. We can adapt to 440V/60Hz or other voltages with proper transformer adjustment. Consult our sales team for details. -
Q: How is the pipe quality tested during production?
A: Our control system monitors melt temperature, pressure, and line speed continuously. Additionally, we recommend offline testing for ring stiffness, impact resistance, and hydrostatic burst pressure according to ISO 9969 or related standards. -
Q: Do you provide spare parts?
A: Yes, we maintain a stock of commonly worn parts (screws, barrels, dies, cutter blades) and can ship them within a week. A recommended spare parts list is provided with the machine manual. -
Q: What is the warranty period?
A: We provide a 12-month warranty from the date of shipment, covering defects in materials and workmanship. Extended warranty options are available upon negotiation.
Contact Qingdao Yongke Machinery today to discuss your sewage water treatment pipe production needs. Our team is ready to provide a customized solution with competitive pricing and professional support.
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