HDPE Gas Supply Pipe Extrusion Line

In municipal infrastructure, gas distribution demands the absolute highest safety standards. Unlike water pipelines, gas conduits operate under sustained high pressure and must endure ground settling, external loads, and chemical exposure without a single micro-fissure. High-Density Polyethylene (HDPE), particularly certified PE100 and PE80 grades, has become the global material of choice. However, processing these raw materials without internal thermal stresses requires extremely precise temperature control and homogeneous melt flow.

To address these critical requirements, Kairun Machinery has officially rolled out HDPE gas supply pipe extrusion line. This complete pipe extrusion system is engineered specifically to process thick-walled, large-diameter HDPE pipes while maintaining strict wall thickness consistency and eliminating the common industry headache of material sagging during cooling.

Advanced Extrusion and Gravimetric Control:

At the heart of this high-efficiency HDPE pipe production line is a single-screw extruder featuring a high-torque gearbox and a specially designed barrier screw. The barrel utilizes cast-aluminum heating elements combined with intelligent air-cooling fans to guarantee a flat and precise thermal gradient.

Consistent wall thickness and weight per meter are vital for certified gas pipe standards. To achieve this, the system integrates highly sensitive gravimetric feeding control. The controller monitors raw material weight against line speed to automatically adjust extruder and haul-off speeds. This eliminates raw material wastage and ensures that every batch matches the specified pressure-bearing rating.

The spiral-distributor die head is engineered with a wide flow channel design. This ensures low melt pressure and low melt temperatures, preventing raw material degradation and minimizing internal stresses within the pipe wall during the forming phase.

Precision Calibration and Sag-Free Cooling:

Because gas pipes require perfect roundness and smooth internal surfaces, the sizing and cooling stages are strictly optimized. The vacuum calibration tank of our HDPE pipe making machine utilizes automatic water level and temperature controllers.

To handle thick-walled pipes where gravity can cause the hot polymer melt to sag downward, the cooling tank features dual-chamber vacuum calibration and a highly efficient spray cooling system. This multi-stage cooling process locks in the dimensions before the pipe reaches the final cooling stage, ensuring perfect concentricity.

A multi-claw haul-off unit with individual motor drives ensures synchronous traction. Next, a dust-free planetary cutter delivers clean, perpendicular chamfered cuts. This prepares the pipes directly for onsite socket-fusion or butt-welding.

FAQ:

Q1: How does it guarantee uniform wall thickness?

A: The system integrates an automatic gravimetric feeder with a spiral distributor die head. This setup dynamically adjusts extrusion speed using real-time weight feedback.

Q2: How is gravity sagging prevented in thick-walled pipes?

A: We use multi-stage vacuum calibration and intensive spray cooling to quickly solidify the pipe’s outer layer, locking its round shape before the core cools.

Q3: Can this machinery produce water pipes as well?

A: Yes. By simply swapping the die head mandrels and adjusting process parameters, you can easily switch between gas, water, and conduit pipe production.

Q4: What cutting system is used? Is there any waste?

A: It features a dust-free planetary cutter that delivers clean, chamfered cuts without generating any plastic debris or material waste.

About Kairun Machinery:

With 17 years of specialized expertise, Kairun Machinery Co., Ltd. is a leading manufacturer in the plastics industry, seamlessly integrating R&D, production, sales, and comprehensive after-sales service.

By leveraging our extensive manufacturing history and deep technical heritage, we deliver high-performance, turnkey solutions for plastic extrusion. Our diverse product portfolio includes:

• Pipe Production: Advanced lines for PE, PPR, PVC, and PVC-O pipes.
• Specialty Extrusion: High-efficiency corrugated and spiral pipe extrusion systems.
• Profiles / Strapping: PVC/WPC profile lines and PP/PET strapping tape production technology.
• Processing / Recycling: High-speed mixing units, as well as integrated granulation and washing systems.

At Kairun, we turn technical accumulation into industrial excellence, ensuring our clients receive robust and innovative machinery tailored to their production needs.

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