HDPE (high-density polyethylene) wear-resistant pipe for mining is widely used in mining transportation systems due to its excellent wear resistance, corrosion resistance and lightweight characteristics, especially in the transportation of high-wear ore sand, tailings and other materials. However, there are still problems such as bend wear and connection leakage in actual applications. The following are the key technologies and solutions for HDPE wear-resistant pipe for mining:

 

1. Wear resistance optimization

The wear resistance of HDPE pipe depends on the molecular weight. The wear resistance of ultra-high molecular weight polyethylene (UHMW-PE) pipe is higher than that of ordinary HDPE. Its wear resistance is 4-7 times that of steel pipe, and it has self-lubricating properties, which can reduce the adhesion of ore sand.

UHMW-PE pipe advantages:

Strong impact resistance, suitable for high-wear slurry transportation.

Low friction coefficient, reducing material flow resistance.

Excellent low temperature resistance, suitable for cold mining environment.

 

2. Bend wear solution

When conveying ore sand, the elbow part is prone to local wear due to eddy currents and impact. In a case of an iron mine, a 45° welded elbow suffered penetrating damage within 1 month because the ore sand formed a high-speed vortex on the inside of the elbow.

Improvement measures:

Reduce the elbow angle: Change the 45° elbow to two 22.5° elbows to reduce fluid impact.

Use large curvature radius elbows: Use the flexibility of HDPE to directly bend and lay to reduce welding joints.

Enhance the wear-resistant layer of the elbow: Add UHMW-PE lining or ceramic coating to the wear-prone parts.

 

3. Connection method optimization

Traditional HDPE pipe docking is prone to leakage, affecting the transportation efficiency. The new combination flange connection technology can improve the sealing performance:

Combination flange connection:

The split flange plate (first combination plate + second combination plate) is used for easy installation.

Interference fit of docking seat + sealing gasket prevents slurry leakage.

 

4. Construction and maintenance suggestions

Construction points:

Use hot melt or electric fusion welding to ensure the strength of the interface.

Avoid dragging and collision of pipelines to prevent mechanical damage.

Maintenance measures:

Regularly check the wear of elbows and joints.

Clean up the sludge deposits in the pipeline to prevent blockage.

 

5. Industry application cases

Nuclear power plant water supply system: The Catawba Nuclear Power Plant in the United States uses HDPE pipes instead of carbon steel pipes. It has no corrosion problems in 20 years of operation and the flow rate has increased by 15-25%.

Mine tailings transportation: After an iron mine switched to UHMW-PE pipes, it solved the problems of blockage and corrosion and extended its service life.

 

HDPE wear-resistant pipes for mining can effectively cope with the challenges of high-wear transportation by optimizing materials (such as UHMW-PE), improving elbow design, and enhancing connection sealing. In the future, with the advancement of polymer material technology, the application of HDPE pipes in the mining field will be further expanded.

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