HDPE Pipe Extrusion Line

The SUHUI HDPE pipe extrusion line is a robust manufacturing system engineered to produce high-density polyethylene (HDPE) pipes for water supply, gas distribution, sewage systems, and industrial pipelines. HDPE pipes offer exceptional corrosion resistance, flexibility, long service life, and weldability — making them the global standard for buried infrastructure pipelines.

This fully automated line supports pipe diameters from Φ20 mm to Φ1,600 mm across various pressure grades (PN6–PN25), compliant with ISO 4427 and ASTM D3350 international standards. The system integrates precision extrusion, multi-stage vacuum calibration, closed-loop water cooling, real-time laser gauging, and servo-driven haul-off for consistent wall thickness and dimensional accuracy at all sizes.

SUHUI offers two HDPE pipe extrusion line series: the 33D series for standard output requirements covering Φ20–1,200 mm, and the high-performance 38D series for higher throughput from Φ20 mm up to Φ1,600 mm.

Key Features of SUHUI HDPE Pipe Extrusion Line

• Wide Diameter Range: Single line covers Φ20 mm to Φ1,600 mm with model-specific extruder and tooling configurations for each size range.
• High-Output Extruder: Single-screw extruder (SJ or HSJ series) with optimized barrier screw design for stable HDPE melting at 160–230°C with outputs up to 1,600 kg/h.
• Multi-Stage Vacuum Calibration: Vacuum calibration tank fixes outer diameter and roundness immediately after the die, ensuring precise pipe geometry.
• Closed-Loop Cooling System: Spray or cascading water cooling tanks with temperature control gradually solidify the pipe, preventing internal stress and ovality.
• Laser Diameter & Wall Thickness Gauging: Online laser gauges monitor outer diameter and wall thickness in real time, enabling immediate process corrections.
• Servo-Driven Haul-Off: Precision servo caterpillar puller maintains constant pulling tension for uniform wall thickness across all line speeds.
• Laser / Inkjet Marking: Surface printing unit applies pipe specifications including diameter, pressure rating, material grade, standard compliance, and production codes.
• Anti-Oxidation Processing: Anti-static and oxidation-resistant components support HDPE grades with carbon black or UV stabilizer additives for outdoor applications.
• Recycled HDPE Compatible: Modular feeding and screw design support blending of recycled HDPE content for sustainable, cost-effective production.

Technical Data – HDPE Pipe Extrusion Line 33D Series

Technical Data – HDPE Pipe Extrusion Line 38D Series

HDPE Pipe Extrusion Process Workflow

1. Material Feeding: HDPE pellets (with UV stabilizer or carbon black for outdoor grades) are fed into the extruder via a gravimetric dosing hopper for precise, consistent material flow.
2. Extrusion & Die Forming: The extruder melts HDPE at 160–230°C and forces the homogeneous melt through a spiral or basket die head, distributing material uniformly around the full pipe circumference.
3. Vacuum Calibration: The extruded pipe enters a vacuum calibration tank immediately after the die, where negative pressure holds the pipe against the calibration sleeve to fix outer diameter and roundness.
4. Multi-Stage Cooling: The pipe passes through a series of water spray or immersion cooling tanks that gradually reduce pipe temperature, relieving thermal stress and stabilizing the final dimensions.
5. Online Gauging: Laser diameter and wall thickness sensors continuously monitor pipe geometry in real time, with closed-loop feedback to the extruder and haul-off for automatic corrections.
6. Marking & Printing: A laser or inkjet marking unit prints pipe specifications — diameter, wall thickness, pressure rating, material grade, standard compliance, and production batch — on the pipe surface.
7. Haul-Off & Cutting: A servo-controlled caterpillar haul-off pulls the pipe at precise speed, then a synchronized planetary saw cuts it to the specified length without stopping the line.
8. Testing & Packaging: Finished pipes undergo hydrostatic pressure testing, ovality measurement, and visual inspection before being bundled, coiled (small diameters), or stacked for shipment.

Frequently Asked Questions

What pipe diameter range does the SUHUI HDPE pipe extrusion line cover?

The SUHUI HDPE pipe extrusion line covers Φ20 mm to Φ1,600 mm in a single line configuration. The 33D series handles Φ20–1,200 mm for standard output requirements, while the high-performance 38D series extends coverage up to Φ1,600 mm with higher throughput. Each model uses extruder and tooling configurations optimized for its specific size range.

What is the difference between the 33D and 38D series?

The 33D series uses SJ single-screw extruders and is suited for standard production requirements, with outputs up to 1,300 kg/h and pipe diameters up to Φ1,200 mm. The 38D series uses high-speed HSJ extruders with a 38D screw design, delivering significantly higher outputs — up to 1,600 kg/h — faster haul-off speeds, and extended diameter coverage up to Φ1,600 mm for large-diameter infrastructure pipe production.

What international standards are the HDPE pipes compliant with?

HDPE pipes produced on the SUHUI extrusion line comply with ISO 4427 (polyethylene pipes for water supply) and ASTM D3350 (standard specification for polyethylene plastics pipe and fittings materials). The line supports production across pressure grades PN6 through PN25, with online laser gauging and real-time dimensional monitoring ensuring compliance with dimensional tolerances throughout production.

How does the vacuum calibration system ensure pipe dimensional accuracy?

Immediately after the die, the extruded pipe enters a vacuum calibration tank where negative pressure holds the pipe against a precision calibration sleeve, fixing the outer diameter and roundness before the material fully solidifies. The pipe then passes through a series of closed-loop water spray or immersion cooling tanks that gradually reduce temperature and relieve thermal stress, stabilizing final dimensions. Online laser sensors provide real-time feedback to automatically correct any dimensional deviation during production.

Can the line process recycled HDPE material?

Yes. The modular feeding system and optimized screw design support blending of recycled HDPE content into the production mix. This allows pipe manufacturers to incorporate post-industrial or post-consumer HDPE recyclate for sustainable, cost-effective production while maintaining dimensional and mechanical performance requirements for the target application.

What applications are HDPE pipes produced on this line suitable for?

HDPE pipes produced on the SUHUI extrusion line are suitable for water supply networks, gas distribution pipelines, sewage and drainage systems, and industrial fluid transfer applications. HDPE offers exceptional corrosion resistance, long service life, flexibility for trenchless installation, and butt-fusion or electrofusion weldability — making it the global standard material for buried and above-ground infrastructure pipelines.