Gas distribution
PE100 black pipe with 2-2.5% carbon black masterbatch is common under EN 1555 because it resists corrosion and can be butt-fused or electrofused.
PIPE EXTRUSION
How PE Pipe Is Made
From HDPE pellet to gas main and water supply pipe.
PE pipe is used where flexibility, corrosion resistance and weldable joints matter: gas distribution, water mains, industrial transfer and mining slurry. The line must be configured around resin grade, SDR class, cooling length and whether the finished pipe is coiled or cut straight.
What PE pipe is used for
PE pipe families are usually specified as PE80, PE100 or PE100-RC. The number refers to MRS, Minimum Required Strength, and determines pressure class when combined with the pipe SDR.
Municipal water main
Large PE pipe handles ground movement better than rigid pipe and is widely used for long buried water networks.
Industrial fluid transfer
HDPE resists many chemicals and is used for plant water, wastewater and process lines.
Mining slurry pipe
High impact resistance and flexibility help PE pipe survive abrasive slurry and difficult installation sites.
Raw material: HDPE pellets and masterbatch
PE pipe normally starts from PE80, PE100 or PE100-RC pellets supplied ready for extrusion. Unlike PVC, PE is not mixed as a dry blend at the pipe factory. For black gas or water pipe, carbon black masterbatch is added for UV protection and weathering resistance; gas pipe commonly requires 2-2.5% carbon black. Colour stripes, such as blue for water or yellow for gas, are produced by a small co-extruder feeding stripe material into the die head.
- PE100 is preferred for high-pressure water and gas because it gives higher long-term strength than PE80.
- PE100-RC improves slow crack growth resistance for trenchless or sandless installation.
- Drying is usually not required for normal HDPE, but material must be clean and protected from dust contamination.
Production process
PE is thermally more stable than PVC and tolerates higher shear, so a single-screw extruder can produce a homogeneous melt. The key challenge is cooling: PE crystallisation releases heat, so large-diameter pipe needs long cooling capacity before cutting.
Pellet feeding
HDPE pellets and masterbatch are dosed into the hopper. Gravimetric feeding is useful when colour stripes or multi-layer pipe require tight material ratios.
Single-screw extrusion
A single-screw extruder, often L/D 30:1, melts PE at about 180-240°C. It is suitable because PE is not as heat-sensitive as PVC and does not need the same gentle twin-screw plasticizing.
Spiral mandrel die
PE pipe commonly uses a spiral mandrel die because it distributes melt without spider weld lines. This improves pipe strength and appearance, especially for pressure pipe.
Vacuum sizing
The pipe is pulled through vacuum sleeves that fix the outside diameter. Vacuum level and water flow must match pipe size to prevent ovality.
Water cooling
PE needs longer cooling than PVC because crystallisation is exothermic. Large pipe may require several tanks so the wall core is cooled before cutting.
Haul-off
Caterpillar haul-off controls line speed and SDR wall thickness. Heavy pipe requires more contact length and pulling force.
Cutting or coiling
Small pipe Ø20-110mm is often coiled into 50m or 100m rolls. Larger pipe is cut with a saw cutter because PE is tough and springy; saw cutting gives a cleaner end than a planetary blade.
Finished pipe and SDR rating
PE pressure pipe is specified by SDR, the ratio of outside diameter to wall thickness. For PE100, SDR11 is commonly PN10, while SDR17 is commonly PN6. Lower SDR means thicker wall and higher pressure capacity. Finished pipe is checked for OD, wall thickness, ovality, carbon black dispersion, elongation and hydrostatic strength. For gas pipe, weldability and long-term crack resistance are as important as line output.
Machines required
These are the core machines for a PE pipe line. A small pipe line may include coiling, while a large-diameter line needs stronger haul-off, longer cooling tanks and a saw cutting system.
Single Screw Extruder
Melts and homogenises PE/HDPE pellets for stable output.
PE Pipe Die Head
Uses spiral distribution to form pressure pipe without weak weld lines.
Vacuum Sizing & Cooling Tank
Controls OD, ovality and cooling time.
Caterpillar Haul-off
Maintains line speed for SDR wall control.
Saw Cutter or Coiler
Cuts large pipe or coils smaller flexible pipe into rolls.
Technical reference
Planning reference only. Final configuration depends on your target spec — share it with the engineering team for a matched proposal.
| Pipe diameter | Ø20-1200mm |
|---|---|
| Output rate | 80-1200 kg/h |
| Pressure system | SDR 6-41 |
| Line speed | 0.2-6 m/min |
| Processing temperature | 180-240°C |
| Material | PE80 / PE100 / PE100-RC / HDPE |
Ready to produce PE pipe?
Send the target diameter range, SDR class, PE grade, output rate and whether the pipe should be coiled or cut. HUADEMAC will match the extruder, die, cooling length and downstream layout within 24 hours.
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