1. Introduction
Goldstone has developed a proprietary composite pipe (GXCG/HDPE) that offers superior abrasion resistance and lower cost of production compared to all leading products in this market area. GXCG/HDPE pipe combines the strength of Goldstone's high pressure steel wire/fiberglass reinforced HDPE pipe technology with the abrasion resistance of a proprietary liner.
2. Main Characteristics
Excellent abrasion resistant property. It is especially suitable for the transportation of slurry, mine refuse and other solid or mixture.
Good melting flow and easy for processing by general polyolefin extrusion equipment.
The composite pipe co-extruded by GXCG material and HDPE/PP has excellent bonding property in the interface, there is no separation in the interface.
Excellent physical characteristics.
Sanitary liner without any toxic additives.
3. Abrasion Resistant Property Test
Weight Lost | HDPE | PEX | UHMWPE
£¨MW: 2,5 million£© | GXCG |
% | 9.6 | 5.2 | 3.7 | 0.27 |
Rotation speed: 1400rpm; wear time: 11h; specimen size: 100mm¡Á100¡Á4mm |
Weight Lost | STEEL
(Q235) | HDPE | UHMWPE | RUBBER | GXCG | Remarks |
% | 0.49 | 0.99 | 0.45 | 0.33 | 0.11 | Small sands£¨Construction use£© |
% |
| 3.48 | 1.56 | 0.94 | 0.74 | Coarse sand (Hard &sharp quartz sand, size: 3mm-5mm) |
Rotation speed: 680rpm;wear time: 4h;specimen size: 75mm¡Á25mm¡Á6mm |
Different material sample plate used for test
From left to right: GXCG, rubber, UHMWPE, HDPE
Weight Lost | UHMWPE | TPU | GXCG-1101 | Remarks |
% | 7.0 | 1.8 | 1.5 | Vanadium titanium coarse sand, size: 1mm¡ª5mm |
Rotation speed: 1400rpm; wear time: 8h;
specimen size: 100 mm¡Á100mm¡Á4mm |
To test how Goldstone GXCG material¡¯s impact wear resistant property, a special testing device is designed. Sand slurry (30% river sand weight) is sprayed out onto the test sample by high pressure pump. Spray speed is 21.64m/s. Two different UHMWPE materials (UHMWPE-1, UHMWPE-2), GXCG material, HDPE material are chosen for test. Spray angle is changed in 86.2¡ãand 56.2¡ã.
Sand slurry spray is used for test
Test Result
Test | Spay Impact Angle | Spray Speed
(m/s) | Spay Impact Time (h) | Wear Weight Loss (g) |
UHMWPE-1 | UHMWPE-2 | GXCG-1101 | HDPE |
Test 1 | 86.2¡ã | 21.64 | 1.98 | 0.1205 | 0.0598 | 0.0022 | 0.1481 |
Test 2 | 56.2¡ã | 21.64 | 3.95 | 0.1128 | 0.0736 | 0.0048 | 0.1650 |
The Darmstadt test consists of a tilting or rocking pipe, pivoted at its centre.
Sands & stone mixture¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡Darmstadt test equipment
Using the HDPE pipe and GXCG/HDPE composite pipe to do the comparative experiments on Darmstadt test, the results are as following:
Pipe Type | DN | Wear Cycles | Weight Loss£¨g£© | Wall Thickness Loss£¨mm£© |
HDPE Pipe (PE100) | 160 | 1,000,000 | 42 | Around 1.8 |
GXCG/HDPE
Composite Pipe | 160 | 1,000,000 | 0 | <0.2 |
Follow pictures are the comparison of HDPE pipe and composite pipe after 1 million wearing cycles.
The sketch drawing of testing device
Pictures of testing device
Different pipes used for testing
Steel pipe after 600 hours testing: Damage &Corrosion
GXCG abrasion-resistant pipe after 600 hours testing: Almost no change or damage
Test result for different pipes
From the test results, it is clear that Goldstone GXCG abrasion resistant pipe is much better than other pipes, the inner pipe surface is smooth and no scratch damage, other pipes has problems of deformation, scratch damage etc.
We have conducted SEM electron microscope analysis for HDPE pipe, GXCG Abrasion-resistant pipe, UHMWPE pipe to see their micro structure. GXCG abrasion-resistant pipe has a much smoother inner surface compared to UHWMPE pipe and normal HDPE pipe
1000 X
100 X
4. Project performance
Goldstone GXCG abrasion resistant pipe has been used in various of mining projects in China and abroad including Rio Tinto, Pangang Steel Mine etc.
The following is one project-iron sand separation facility usage description:
Normal steel elbow leaks only 9 days after installation
Goldstone abrasion-resistant elbow before installation
Elbow is installed to the iron sand separation transportation pipes
After 5 months operation, no damage to the abrasion-resistant elbow, installed again
