| Quantity: | |
|---|---|
The PE-KM Pipe (Polyethylene Pipe for Coal Mines) is a specialized high-performance pipeline engineered exclusively for the harsh, high-risk environment of underground coal mines. Unlike standard polyethylene pipes, it undergoes unique material formulation and manufacturing processes to meet strict coal mine safety standards. Designed to address the critical risks of static electricity and fire in underground settings, this coal mine polyethylene pipe integrates intrinsic safety features with robust mechanical performance. It combines the natural advantages of PE—such as corrosion resistance and flexibility—with enhanced anti-static and flame-retardant properties, making it an indispensable infrastructure component for “intrinsically safe mines.”
| Parameter category | Parameter name | Unit | Standard value/requirement | Notes and Explanations |
| Safety performance | Surface resistance | Ω | ≤ 1.0 × 10⁶ | Core safety indicators: Extremely low resistance ensures that static electricity can be discharged in time, preventing the accumulation of static electricity and the generation of sparks. |
| Flame retardancy | - | Flame burning time ≤ 10s | Core security indicators. The pipe should be able to self-extinguish quickly after being removed from the open flame and should not drip burning materials. | |
| Physical and mechanical properties | Tensile yield strength | MPa | Flameless combustion time ≤ 60s | Measure the pipe material's ability to resist tensile deformation and damage |
| Elongation at break | % | ≥ 22 | The toughness and ductility of the pipe are measured. The higher the value, the better the flexibility and the less likely it is to break due to brittleness | |
| Longitudinal retraction rate | % | ≥ 350 | It reflects the thermal stability of the pipe material, with small dimensional changes after heating | |
| Hydraulic test (20°C, ring stress 9.0MPa, 100 hours) | - | ≤ 3 | Short-term pressure resistance strength test to verify the sealing performance and pressure-bearing capacity of the pipe material and interfaces. | |
Hydraulic test (80°C, ring stress 4.6MPa, 165h) | - | No cracking, no leakage | Long-term hydrostatic strength testing to predict the long-term service life of pipes. | |
| Hammer impact test (0°C) | - | No cracking, no leakage | Measure the impact toughness of the pipe material at low temperatures to adapt to the complex underground environment. | |
| Materials and Design | Grade of raw materials | - | Pass/Do not break | PE100 grade is more commonly used, featuring higher pressure-bearing capacity and resistance to crack growth. |
| Nominal pressure (PN) | MPa | PE80 or PE100 | It refers to the maximum allowable working pressure of the pipe at 20°C. The selection should be based on the actual pressure of the application system. | |
| Nominal outer diameter (dn) | mm | Common ones include PN0.8, PN1.0, PN1.25, PN1.6, etc | Covering a wide range of requirements from branch pipelines to main water supply/drainage pipes. | |
| Standard Dimension Ratio (SDR) | - | It has a wide range, from 20mm to 800mm or even larger | SDR = Outer diameter/Wall thickness. The smaller the SDR value, the thicker the pipe wall and the higher the pressure-bearing capacity. | |
| Other features | Connection method | - | Hot-melt butt welding and electrofusion connection | It features high connection strength and can achieve overall leak-free operation of the entire pipeline system |
| Color | - | It is usually black with prominent yellow marking lines on the surface | It is convenient to identify in the dim environment underground |
The anti-static coal mine pipe is formulated with permanent antistatic agents, ensuring static electricity is promptly dissipated to prevent sparking—a major hazard in coal mines with flammable gases and coal dust. Additionally, its flame-retardant PE pipe properties mean it self-extinguishes quickly after being removed from an open flame, preventing fire spread and protecting miners’ safety.
Underground coal mines face frequent impacts from falling rocks and equipment collisions. The PE-KM Pipe boasts exceptional impact-resistant mine pipe performance, remaining crack-free even in low-temperature conditions. Its high toughness and pressure resistance make it suitable for bearing systems like water supply, compressed air, and drainage.
Coal mine water often contains acidic substances and chemicals that corrode metal pipes. The corrosion-resistant mine pipeline resists chemical erosion, rust, and scaling, outperforming steel pipes in service life. It also excels in wear resistance when conveying slurry with coal powder or rock powder.
With a density far lower than steel pipes, the lightweight mine pipe is easy to transport and install, reducing labor intensity and costs. Hot-melt butt welding and electrofusion connections create strong, leak-proof joints, integrating the pipeline system for zero leakage.
The stable chemical properties and anti-aging performance of PE ensure the pipe serves for decades in dark, damp underground environments. It requires almost no maintenance, offering significant long-term economic benefits compared to traditional pipes.
The pipe efficiently handles underground production water, domestic water, and wastewater drainage. Its corrosion resistance and pressure-bearing capacity make it reliable for continuous operation in coal mines.
Used as underground compressed air ducts. It delivers clean, dry compressed air to mining equipment, ensuring smooth operation of tools and machinery.
The gas drainage pipe safely conveys methane and other gases from underground mines, reducing explosion risks and improving workplace safety.
Ideal for coal mine grouting, spraying systems, and pulverized coal transport, its wear resistance ensures durability when handling particulate-laden fluids.
Crafted from high-grade PE (PE80 or PE100), the pipe is enhanced with permanent antistatic and flame-retardant additives to meet coal mine safety requirements.
The pipe’s wall thickness and structure are optimized for mechanical strength and flexibility, allowing it to adapt to uneven tunnels and minor ground movements. The smooth inner surface reduces flow resistance for efficient conveyance.
Hot-melt butt welding and electrofusion connections ensure joint strength matches the pipe itself, achieving a leak-proof system. These connections are simple to execute even in underground conditions.
Yes, it is specifically designed to meet strict coal mine safety regulations, with intrinsic anti-static and flame-retardant properties that eliminate fire and explosion risks at the material level.
Absolutely. The pipe’s excellent toughness ensures it does not crack or break under low-temperature conditions, adapting to the variable temperatures of underground environments.
The pipe is virtually maintenance-free. Its corrosion-resistant and wear-resistant properties eliminate the need for regular treatments or replacements, reducing downtime and maintenance costs for coal mines.
