HDPE wear-resistant pipe for mining is a pipe made of high-density polyethylene (HDPE) material, designed for high-wear and high-corrosion working conditions such as mines, ore dressing plants, and tailings transportation. Compared with traditional metal pipes, HDPE wear-resistant pipes have the advantages of light weight, corrosion resistance, impact resistance, and long service life. They are widely used in the transportation of slurry, sediment, tailings and other media.
Property | Advantage |
High Wear Resistance | Made of ultra-high molecular weight polyethylene (UHMWPE) or modified HDPE material, with 3-5 times the wear resistance of steel pipes |
Strong Corrosion Resistance | Resistant to acids, alkalis, salts, slurry and other corrosive media, service life can exceed 20 years |
Good Impact Resistance | High toughness, can withstand impact from ores and gravel, not prone to cracking |
Light Weight | Density only 1/8 that of steel pipes, easy installation, reduces transportation and construction costs |
Low Friction Coefficient | Smooth inner wall reduces flow resistance and lowers energy consumption |
Non-scaling | Resists adhesion of slurry and mud, minimizing clogging risks |
Environmentally Safe | Non-toxic and odorless, complies with mining environmental requirements |
Slurry transportation: slurry pipelines for gold, copper, iron ore, etc.
Tailing discharge: tailings transportation system for ore dressing plants
Sediment transportation: river dredging and dredging projects
Chemical media: transportation of corrosive liquids (such as acidic mine water)
Coal industry: discharge of coal slime and coal washing wastewater
(1) Material selection
Ordinary HDPE pipes: suitable for general wear environments, low cost
UHMWPE (ultra-high molecular weight polyethylene) pipes: ultra-high wear resistance, suitable for high-wear slurry transportation
Steel-plastic composite wear-resistant pipes: outer layer HDPE anti-corrosion, inner layer wear-resistant alloy, suitable for high pressure and high wear conditions
(2) Pressure level
Low pressure (0.6-1.0MPa): suitable for gravity transportation or low-pressure pipelines
Medium and high pressure (1.0-2.5MPa): suitable for pumping slurry or long-distance transportation
(3) Connection method
Flange connection: suitable for high pressure and large-diameter pipelines
Hot-melt connection: suitable for seamless long-distance laying
Electrofusion connection: suitable for complex terrain or maintenance scenarios
Comparison Item | HDPE Wear-resistant Pipe | Metal Pipe (Steel Pipe, Cast Iron Pipe) |
Wear Resistance | Excellent (3-5 times that of steel pipes) | Moderate, requires rubber or ceramic lining |
Corrosion Resistance | Outstanding, no anti-corrosion treatment needed | Prone to corrosion, requires anti-corrosion coating |
Weight | Lightweight, easy to install | Heavy, high transportation and installation costs |
Service Life | Over 20 years | 5-10 years (requires frequent maintenance) |
Maintenance Cost | Low | High (requires regular replacement and anti-corrosion treatment) |
HDPE wear-resistant pipes for mining are gradually replacing traditional metal pipes and becoming the first choice in the mining industry due to their advantages of wear resistance, corrosion resistance, light weight and long life. When selecting the type, it is necessary to select the appropriate material and connection method according to the medium characteristics, pressure requirements and installation environment to ensure the long-term stable operation of the system.
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HDPE (high-density polyethylene) pipe is more suitable for low temperature environment than PVC pipe, mainly based on the following key reasons:
1. Excellent low temperature toughness
Cold resistance: HDPE can still maintain flexibility and impact resistance in the range of -60°C to 60°C, while PVC will gradually become brittle and easy to crack below 0°C.
Impact resistance: The molecular structure of HDPE is not prone to brittle fracture at low temperatures, which is suitable for cold areas or frozen liquid transportation.
2. Material property advantages
Higher crystallinity: The high crystallinity of HDPE enables it to maintain the flexibility of the molecular chain at low temperatures, while PVC is a rigid material with a larger low-temperature shrinkage rate.
No plasticizer migration: HDPE does not need to add plasticizers (PVC needs to add), avoiding the problem of material hardening caused by the precipitation of plasticizers at low temperatures.
3. Anti-frost heave performance
Elastic deformation ability: HDPE pipes can alleviate the volume expansion of internal water when it freezes through slight deformation, reducing the risk of pipe bursting; PVC is easy to be frozen and cracked due to its strong rigidity.
Low temperature flexibility: Even if frozen, HDPE pipes can usually return to their original shape after thawing, while PVC may be permanently damaged due to brittleness.
4. Chemical corrosion resistance
Resistance to stress cracking: HDPE is more resistant to chemical media (such as salt and snow melting agents) in low temperature environments, and is suitable for municipal or industrial applications in cold areas.
5. Convenient installation and maintenance
Cold bending construction: HDPE pipes can still be bent and installed at low temperatures, reducing the number of joints; PVC pipes need to be heated or specially treated when installed in cold weather.
Reliability of hot melt connection: HDPE hot melt joints have stable sealing at low temperatures, while PVC adhesive joints may have poor curing effect at low temperatures.
Water supply/drainage in cold regions: HDPE pipes are widely used in high-latitude regions such as Northern Europe and Canada.
Refrigeration fluid transportation: low-temperature medium transportation systems such as food processing and chemical industry.
Ground source heat pump pipeline: long-term stable operation in underground low-temperature environment.
Property | HDPE | PVC |
Minimum Tolerable Temperature | -60°C | -10°C to 0°C (brittle and prone to cracking) |
Low Temperature Impact Resistance | Excellent | Poor |
Frost Heave Adaptability | Can absorb through deformation | Prone to rupture |
Joint Reliability | Stable with heat fusion connection | Adhesive joints prone to failure |
Although HDPE has excellent low temperature resistance, it is still necessary to select specially formulated HDPE (such as PE-RT) or take insulation measures under extremely low temperatures (such as below -50°C) or frequent freeze-thaw cycles.
The comprehensive properties of HDPE make it the first choice for low temperature environments, while PVC is more suitable for temperate or indoor applications.
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Ring stiffness is a core indicator for measuring the ability of a pipeline to resist deformation under external pressure (such as soil pressure, traffic load), with the unit of kN/m², indicating the deformation resistance of the pipeline under vertical load.
Formula:
Ring stiffness (SN) = EID3Ring stiffness (SN) = D3EI
EE: Material elastic modulus
II: Pipe section moment of inertia
DD: Pipe diameter
International general standards (such as ISO 9969, ASTM D2412) classify ring stiffness into the following grades:
Grade | Ring Stiffness (kN/m²) | Application Scenarios |
SN2 | ≥2 | Low-load areas (e.g., green space drainage) |
SN4 | ≥4 | Light-duty roads, residential drainage |
SN8 | ≥8 | Municipal roads, general traffic areas |
SN12.5 | ≥12.5 | Heavy vehicle traffic (e.g., highways) |
SN16 | ≥16 | Ultra-deep burial or extreme load conditions |
Pipe structure:
Solid wall pipe: high stiffness, suitable for high-pressure scenarios (such as SN8 and above).
Double-wall corrugated pipe: hollow structure is lightweight, but can reach SN4-SN8 through corrugated design.
Steel belt reinforced pipe: composite steel belt support, can reach SN12.5-SN16.
Material density: The density of HDPE raw material (usually ≥0.941g/cm³) directly affects rigidity.
Wall thickness design: Under the same diameter, increasing wall thickness can significantly improve ring stiffness.
Buried depth <1m: SN4 (such as courtyard drainage).
Buried depth 1-3m: SN8 (municipal road).
Buried depth >3m or heavy load: SN12.5-SN16 (need to be calculated in combination with soil quality).
Dynamic load: areas with frequent traffic need to increase by 1-2 levels (such as SN8→SN12.5).
Laboratory test: Perform three-point loading test according to ISO 9969 to measure the deformation rate of pipes.
On-site verification: Deformation rate detection is required after construction (usually required to be ≤5%).
Certification standards:
National standard: GB/T 19472.1 (buried polyethylene double-wall corrugated pipe)
European standard: EN 13476 (structural wall pipe system)
Misunderstanding 1: The higher the ring stiffness, the better?
→ Excessive pursuit of high stiffness may increase costs, and it is necessary to balance load requirements and economy.
Misunderstanding 2: HDPE pipe flexibility = low stiffness?
→ Structural design (such as corrugation, reinforcement layer) can take into account flexibility and high stiffness.
Construction points:
Backfill materials should use coarse sand or gravel to avoid sharp stones damaging the pipe wall.
Layer compaction to prevent local stress concentration.
Pipe Type | Typical Ring Stiffness (kN/m²) | Characteristics |
HDPE Double-Wall Corrugated Pipe | SN4–SN8 | Lightweight, economical, suitable for general drainage |
HDPE Steel Belt Reinforced Pipe | SN8–SN16 | Ultra-high strength, ideal for deep burial or heavy load conditions |
PVC Solid Wall Pipe | SN2–SN4 | High rigidity but poor impact resistance |
Concrete Pipe | ≥20 | Heavy and costly to install |
The ring stiffness level of HDPE pipe directly determines its engineering applicability. When selecting, it is necessary to comprehensively evaluate the burial depth, load, soil quality and cost. For high-demand scenarios (such as municipal trunk roads), it is recommended to choose SN8 or above and match it with a steel belt reinforcement structure to ensure long-term stability.
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PE100 grade HDPE pipe refers to pipes made of PE100 grade in high-density polyethylene (HDPE) material.
PE (Polyethylene) Grading: HDPE materials are divided into different grades according to density, mechanical properties and pressure resistance, and the common ones are PE32, PE63, PE80 and PE100.
PE100 is the highest performance grade at present, with higher compressive strength, crack propagation resistance and long-term durability.
The number (such as 100) represents the minimum required strength (MRS) in MPa. The MRS of PE100 is 10 MPa, which is an upgraded version of PE80 (8 MPa).
High strength: can withstand higher pressure (common pressure grades: PN10, PN16, etc.), suitable for high-pressure scenarios such as water and gas transmission.
Chemical corrosion resistance: Resistant to acids, alkalis, salts and other chemicals, suitable for industrial wastewater systems.
Lightweight and flexible: Lightweight (only 1/8 of metal pipes), easy to transport and install, and can be bent to adapt to the terrain.
Long life: Design life can reach more than 50 years, UV resistance (if carbon black is added) and environmental stress cracking resistance.
Environmentally friendly and non-toxic: Meets drinking water standards (such as ISO 4427) and is often used in water supply networks.
Water supply system: municipal tap water, direct drinking water pipeline.
Gas transmission: medium and low pressure gas pipeline network (must comply with standards such as ISO 4437).
Industrial pipeline: chemical fluid, slurry transportation.
Drainage/sewage system: strong corrosion resistance, suitable for rainwater and sewage discharge.
Feature | PE100 | PE80 |
Minimum Required Strength (MRS) | 10 MPa | 8 MPa |
Pressure Capacity | Higher (achieves same pressure with thinner wall) | Lower |
Crack Resistance | Superior | Moderate |
Cost | Slightly higher | Lower |
ISO 4427: Production and testing standard for PE100 water supply pipes.
EN 12201: European standard for HDPE pipes for water supply.
GB/T 13663: National standard for PE pipes for water supply in China.
PE100 grade HDPE pipes have become the preferred material for modern pipeline engineering due to their high strength, corrosion resistance and long life, especially suitable for high-pressure and high-demand application scenarios. When choosing, pay attention to the certification standards (such as ISO or GB) and the actual working conditions.
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In the chemical industry, transporting corrosive media such as acids, alkalis, salts and other chemicals is a very challenging task. As the core of the transportation system, the material selection of the pipeline directly affects the safety and economy of operation. Among many materials, high-density polyethylene (HDPE) pipes have become one of the first choices in the chemical industry due to their excellent corrosion resistance, toughness and service life.
1. Excellent corrosion resistance
HDPE pipes have extremely high chemical stability to most inorganic acids, alkalis and salt solutions. It can effectively resist corrosive media such as sulfuric acid, hydrochloric acid, sodium hydroxide, and is widely used in chemical waste liquids, wastewater treatment, industrial water supply and drainage systems.
2. High impact strength and good wear resistance
HDPE pipes have good flexibility and impact resistance, and can maintain excellent performance even in low temperature environments, and are not prone to rupture. At the same time, its inner wall is smooth, the fluid resistance is small, and it is not easy to scale and clog after long-term use.
3. Easy installation and low maintenance cost
HDPE pipes can be connected by hot-melt or electric fusion. The joints are firm and leak-free, suitable for long-distance continuous laying, greatly reducing connection points, and reducing maintenance costs and labor costs.
4. Long service life and high cost performance
Under normal use conditions, the service life of HDPE pipes can reach more than 50 years, and its overall return on investment is much higher than that of traditional metal or cement pipes.
In the chemical industry, according to different conveying media and pressure requirements, the following commonly used HDPE acid and alkali resistant pipe specifications are recommended:
Specification (Outer Diameter × Wall Thickness) | Pressure Rating (PN) | Application Examples |
63mm × 5.8mm | PN10 | Laboratory waste discharge, small-scale chemical systems |
110mm × 10.0mm | PN16 | Main pipelines for acid and alkali transport |
160mm × 14.6mm | PN16 | Circulating water or wastewater systems in chemical plants |
250mm × 22.7mm | PN16 | Pipelines in large chemical industrial parks |
Note: All recommended products are made of PE100 raw material and comply with ISO 4427 and GB/T 13663 standards.
1. Clarify the type and concentration of the conveying medium and select the appropriate pressure level;
2. Confirm the operating temperature of the pipeline. Generally, HDPE pipes are suitable for the range of 0℃ to 60℃;
3. Experienced manufacturers are preferred to ensure the quality of raw materials and welding technology;
4. Use corrosion-resistant HDPE pipe fittings to ensure the overall performance of the system.
In the pursuit of efficient, safe and sustainable modern chemical industry, HDPE acid- and alkali-resistant pipes are gradually replacing traditional pipes with their excellent comprehensive performance and cost advantages, becoming the ideal choice for the new generation of chemical conveying systems. We recommend that purchasers give priority to certified and experienced HDPE pipe manufacturers when selecting to ensure stable, safe and reliable system operation.
Official website: www.phtopindustry.com | www.phpipes.com
Contact us: Email:inquiry@phtopindustry.com | Whatsapp:+86 15093100892
Company address: Room 802, 8th Floor, Building 5, Jinyin Modern City, Jinshui District, Zhengzhou City, Henan Province, China