High-density polyethylene (HDPE) pipes are widely used in water supply, drainage, gas transmission, and industrial pipelines due to their excellent corrosion resistance, flexibility, long service life, and environmental friendliness. To ensure the quality of HDPE pipe construction, strict compliance with relevant specifications is essential. This article details the construction standards for HDPE pipes, covering key stages such as material inspection, storage, welding, installation, and backfilling.
1. Material Inspection
Check the factory certificates, test reports, and specifications of pipes and fittings to ensure compliance with design requirements.
Visual inspection: Pipes must be free of cracks, dents, bubbles, or impurities, with uniform color and clear markings.
Dimensional inspection: Pipe diameter and wall thickness must meet national standards (e.g., GB/T 13663, ISO 4427).
2. Storage Requirements
HDPE pipes should be stored on a flat, ventilated site, avoiding direct sunlight and high temperatures (recommended temperature ≤ 40°C).
Stacking height should not exceed 1.5 meters to prevent deformation.
Pipes must be kept away from sharp objects to avoid scratches.
HDPE pipes are primarily joined using butt fusion welding or electrofusion welding, with strict adherence to welding procedures.
1. Butt Fusion Welding
Preparation
Verify welding machine temperature (typically 210±10°C) and pressure settings.
Clean pipe ends to remove oil, dirt, or debris.
Use clamps to align pipes properly.
Welding Process
Heating phase: Heat pipe ends until molten (duration depends on pipe diameter and wall thickness).
Transition phase: Quickly remove the heating plate to prevent oxidation.
Joining phase: Apply pressure to fuse the ends and maintain pressure during cooling.
Quality Inspection
Check for uniform weld beads with no cracks or weak joints.
Bead height should meet standards (typically 10%~20% of wall thickness).
2. Electrofusion Welding
Preparation
Clean pipe and fitting surfaces, removing oxidation layers.
Ensure electrofusion fittings match pipe specifications.
Welding Process
Insert pipe into the electrofusion coupler until fully seated.
Apply electricity according to the manufacturer’s voltage and time parameters.
Do not move the pipe during cooling.
Quality Inspection
Check indicator pins on fittings to confirm proper fusion.
1. Trench Excavation
Trench width should accommodate pipe installation and backfilling (minimum ≥ pipe outer diameter + 300mm).
Trench bottom must be level and free of sharp rocks; soft soil requires compaction or a sand bedding layer.
2. Pipe Laying
Use manual or mechanical methods to lower pipes, avoiding throwing or dragging.
Minimum bending radius ≥ 25 times pipe diameter to prevent deformation.
Install protective sleeves when crossing roads or structures.
Initial backfill: Use fine sand or soft soil (free of rocks) up to 300mm above the pipe, compacted in layers (≤ 200mm per layer).
Final backfill: Compact in layers as per design requirements; avoid direct heavy machinery pressure on pipes.
Hydrostatic test: Gradually increase pressure to 1.5 times working pressure, hold for 30 minutes; pass if pressure drop ≤ 5%.
Leak test (gas pipelines): Apply soap solution to check for leaks at joints.
Welders must wear protective gloves and goggles.
Mark construction zones with warning signs to prevent pipe damage.
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Company address: Room 802, 8th Floor, Building 5, Jinyin Modern City, Jinshui District, Zhengzhou City, Henan Province, China
High-density polyethylene (HDPE) pipes are widely used in water supply, drainage, gas transmission, and industrial pipelines due to their excellent corrosion resistance, flexibility, and long service life. Heat fusion is the primary connection method for HDPE pipes, and its quality directly affects the safety and lifespan of the entire pipeline system. This article details the precautions for HDPE pipe heat fusion to help operators master the correct procedures.
1. Material Inspection
Pipe Quality Verification: Ensure HDPE pipes and fittings comply with GB/T 13663 or ISO 4427 standards.
Dimensional Check: Confirm matching specifications and wall thicknesses between pipes and fittings.
Surface Cleaning: Remove dirt, grease, and oxidation layers from pipe ends.
2. Environmental Conditions
Temperature Requirements: Ambient temperature should be between -5°C to 45°C.
Wind Protection: Use windbreaks for outdoor work to prevent wind interference.
Rain & Moisture Prevention: Avoid construction in rain/snow; keep connection areas dry.
3. Equipment Check
Fusion Machine Calibration: Verify heating plate temperature accuracy (210±10°C).
Clamp Inspection: Ensure clamps are clean and provide sufficient gripping force.
Stable Power Supply: Prevent voltage fluctuations affecting heating performance.
1. Butt Fusion (Fusion Joining) Precautions
Pipe End Preparation:
Use a special milling tool to ensure flat end surfaces.
Perform fusion immediately after milling to avoid contamination.
Heating Process:
Maintain heating plate temperature at 210±10°C.
Heating time: ~10 seconds per 1mm wall thickness.
Apply moderate pressure to avoid excessive "bead" formation.
Joining Process:
Transition time (heating plate removal to joining) must not exceed limits.
Apply uniform joining pressure to prevent misalignment.
Allow sufficient cooling time—no forced cooling.
2. Electrofusion Precautions
Pipe End Prep:
Remove oxidation layer (depth: 0.1–0.2mm) from the joint area.
Mark insertion depth to ensure proper pipe seating.
Power Control:
Use a voltage stabilizer for consistent power supply.
Strictly follow voltage and time parameters specified by the fitting manufacturer.
Cooling Phase:
Allow natural cooling post-fusion.
Do not move or pressurize pipes during cooling.
Common Issues & Preventive Measures
Issue | Possible Cause | Prevention |
Uneven fusion surface | Uneven heating plate/poor pipe end prep | Regularly inspect heating plate/ensure proper milling |
Weak joint strength | Insufficient heating/pressure/rapid cooling | Strictly control parameters/allow full cooling |
Pipe misalignment | Clamp misalignment/improper operation | Adjust clamps carefully/follow procedures |
Contaminated joint | Poor cleaning/dirty environment | Thorough cleaning/improve work conditions |
1. Visual Inspection
Fusion bead should be uniform and continuous.
No bubbles, cracks, or defects.
Bead height must meet standards.
2. Pressure Testing
Perform hydrostatic strength test (GB/T 19471.2).
Test pressure: 1.5× working pressure.
3. Destructive Testing
Conduct tensile tests on samples periodically.
Fracture should occur in the pipe body, not the joint.
HDPE pipe heat fusion requires technical expertise and experience. Strict adherence to procedures and precautions ensures joint integrity and system safety. Regular operator training and a robust quality control system are recommended for optimal results.
By following these guidelines, installation quality and pipeline longevity can be significantly improved, reducing maintenance costs and ensuring long-term reliability.
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
High-Density Polyethylene (HDPE) pipes are widely used in water supply, drainage, gas, and chemical industries due to their advantages such as corrosion resistance, impact resistance, and long service life. The welding methods for HDPE pipes mainly include Butt Fusion and Electrofusion, ensuring a leak-free and high-strength pipeline system.
1. Preparation
Inspect equipment: Ensure the hot melt welding machine (heating plate, clamps, hydraulic system) is functioning properly.
Clean pipe ends: Use alcohol or a non-woven cloth to remove dirt, grease, and oxidation from the pipe ends.
Align pipes: Secure the pipes with clamps to ensure flat and aligned ends, with misalignment ≤10% of wall thickness.
2. Heating Phase
Set temperature: The heating plate temperature is typically 200–220°C (adjust based on pipe specifications).
Apply pressure:
Insert the heating plate between the pipe ends and apply initial pressure (0.1–0.2 MPa).
Observe the bead height; once it reaches the standard value (e.g., ~2 mm for DN110 pipes), reduce pressure and maintain heating time (refer to the table below).
Pipe Diameter (mm) | Heating Time (sec) | Changeover Time (sec) | Cooling Time (min) |
DN63 | 30–40 | ≤5 | 6–8 |
DN315 | 120–150 | ≤8 | 20–25 |
3. Changeover and Fusion
Quickly remove the heating plate: Complete within 5 seconds to avoid heat loss.
Apply fusion pressure: Immediately apply butt pressure (0.15–0.3 MPa) to ensure thorough material bonding and uniform bead formation.
4. Cooling and Inspection
Natural cooling: Maintain pressure until the cooling time ends (see table). Do not move the pipes during this period.
Check the weld: The bead should be symmetrical, without cracks or depressions.
1. Preparation
Select electrofusion fittings: Ensure the fittings match the pipe specifications (e.g., DN110 electrofusion coupler).
Mark insertion depth: Mark the insertion line on the pipe end to avoid improper fitting placement.
2. Cleaning and Assembly
Remove oxidation layer: Use a scraper to remove 0.1–0.2 mm of the pipe surface to expose fresh material.
Install fittings: Insert the pipe into the electrofusion coupler up to the marked line and secure with clamps to prevent misalignment.
3. Power-On Welding
Input parameters: Scan the barcode or manually enter welding parameters (voltage, time) from the fitting label.
Start welding: The machine will heat automatically. Observe the indicator holes for molten material overflow.
4. Cooling and Testing
Natural cooling: Cooling time should be ≥ specified duration (typically 10–30 minutes).
Leak test: Verify sealing integrity through air or hydrostatic pressure tests.
Environmental requirements: Avoid working in strong wind, rain, or low temperatures (<–5°C). Use windbreaks if necessary.
Quality checks:
Butt fusion bead height tolerance ≤10%.
Electrofusion indicator holes should show uniform material rise.
Safety measures: Wear heat-resistant gloves and goggles to prevent burns or arc flash injuries.
Uneven bead: Caused by uneven heating plate temperature or insufficient pressure. Recalibrate equipment.
Poor electrofusion joint: Due to incomplete oxidation removal. Re-scrape and reweld.
Mastering Butt Fusion and Electrofusion techniques is essential for ensuring long-term stability of HDPE pipeline systems. Operators should undergo professional training and strictly follow welding parameters.
(This guide applies to HDPE pipes from DN20–DN1200 mm. For PVC pipes, adjust temperature to 170–190°C.)
For detailed parameter tables or operation videos, contact us for technical support!
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
In the mining process, tailings transportation is a critical step. Choosing the right pipeline material directly affects transportation efficiency, safety, and operational costs. High-Density Polyethylene (HDPE) pipes, with their excellent corrosion resistance, high wear resistance, and long service life, have become the preferred material for tailings transportation. This article details the HDPE pipe models suitable for mine tailings transportation, their performance characteristics, and selection recommendations to help engineers optimize pipeline system design.
1. Mine tailings typically have the following characteristics, imposing high demands on pipeline materials:
2. High Abrasiveness: Tailings particles (e.g., ore sand, slurry) cause severe wear on pipe walls.
3. Corrosiveness: May contain acidic or alkaline components, easily corroding metal pipes.
4. High-Pressure Transportation: Long-distance transportation requires high pressure resistance.
5. Environmental Adaptability: Must withstand complex terrains (e.g., mountains, mining areas) and extreme climates.
Advantages of HDPE Pipes:
1. Wear Resistance: Superior to steel and PVC pipes, especially suitable for high-solid-content tailings.
2. Corrosion Resistance: Resistant to acids, alkalis, and salts, with a lifespan of up to 50 years.
3. Flexibility: Adapts to ground settlement and has excellent seismic performance.
4. Lightweight: Easy to install, reducing transportation and construction costs.
(1) Classification by Pressure Rating
Model (PN) | Pressure Rating (MPa) | Application |
PN6 | 0.6 MPa | Low-pressure, short-distance transportation |
PN10 | 1.0 MPa | Medium-pressure conventional tailings pipelines |
PN16 | 1.6 MPa | High-pressure, long-distance transportation |
SDR11 (Extra-thick wall) | ≥2.0 MPa | High-concentration tailings or high-lift pumping |
(2) Classification by Diameter
Nominal Diameter (DN) | Common Applications |
DN50-DN200 | Small mines, branch pipelines |
DN250-DN500 | Medium-sized tailings main pipelines |
DN600-DN1200 | Large-scale, long-distance transportation |
(3) Special Reinforced HDPE Pipes
Ultra-High Molecular Weight Polyethylene (UHMWPE) Pipes: 3-5 times more wear-resistant, ideal for highly abrasive tailings.
Steel-Reinforced HDPE Spiral Corrugated Pipes: Combines steel’s pressure resistance with HDPE’s corrosion resistance, suitable for deep burial or high-load conditions.
Tailings pipelines require leak-proof and durable connections. Common methods include:
Connection Method | Application | Advantages |
Butt Fusion | DN≥90mm main pipelines | High strength, no leakage |
Electrofusion | Complex terrains or repairs | Fast installation, adapts to irregular joints |
Flange Connection | Connection to pumps/valves | Detachable, easy maintenance |
Choose PN rating based on pressure: For long-distance or high-lift pumping, select PN16/SDR11.
Select material based on abrasiveness: For highly abrasive tailings, prioritize UHMWPE or thick-walled pipes.
Consider terrain adaptability: Flexible HDPE pipes suit seismic zones or subsidence areas; steel-reinforced pipes suit deep burial.
Balance cost-effectiveness: Small-diameter pipes may use PN10, while large-diameter high-pressure pipes should use PN16.
Copper Mine Tailings Project: Used DN800 PN16 HDPE pipes for 15km transportation, operating for 10 years without corrosion or leaks.
Gold Mine High-Concentration Tailings: Used UHMWPE-lined pipes, extending service life 3x compared to standard HDPE pipes.
HDPE pipes, with their wear resistance, corrosion resistance, and long lifespan, have become the mainstream choice for mine tailings transportation. Proper selection requires considering pressure, diameter, abrasiveness, and connection methods. We recommend collaborating with professional suppliers for customized solutions. We are a professional HDPE pipeline solutions provider. Contact us for further assistance.
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
In the field of marine engineering, high-density polyethylene (HDPE) pipes are ideal for seawater transportation, submarine cable protection, offshore oil extraction and other applications due to their excellent corrosion resistance, impact resistance and long life. However, due to the particularity of the marine environment (high salinity, high pressure, strong corrosion), the quality requirements for HDPE pipes are extremely high.
Among many HDPE pipe manufacturers, Puhui Industry has become a trusted supplier for global customers with its advanced production technology, strict quality control and rich experience in marine engineering. This article will introduce Puhui Industry's product advantages and purchase recommendations in detail to help you make a wise choice.
Challenges of the marine environment to pipelines include:
1. High salinity corrosion → Ordinary metal pipes are prone to rust, HDPE is resistant to chemical corrosion
2. High pressure and water flow impact → High ring stiffness (SN8 or above) and pressure resistance are required
3. Ultraviolet (UV) aging → Anti-UV stabilizer needs to be added
4. Biological attachment (such as barnacles) → Special surface treatment is required
Therefore, high-quality marine engineering HDPE pipes must meet higher material standards, and Puhui Industry's products are designed for this purpose.
Corporate Background
Established in 2005 (nearly 20 years of experience in HDPE pipe production)
Headquarters: Shandong, China (with a modern production base)
Certifications: ISO 9001, ISO 14001, CE, ASTM F714 (marine pipe standard)
Market coverage: 50+ countries in Asia, Europe, Middle East, Africa, etc.
Core Advantages
1. High-quality raw materials: PE100/PE100-RC grade virgin HDPE is used to ensure high strength and stress cracking resistance
2. Anti-UV and weathering: Add carbon black (2.5%~3%) to extend outdoor service life
3. Customized production: Support DN50-DN2000mm caliber, and can provide double-wall corrugated pipes, solid wall pipes, armored pipes, etc.
4. Marine engineering research: Optimize pipe formula for seawater corrosion and high-pressure environment
(1) HDPE solid wall pipe (suitable for submarine water supply and sewage discharge)
Pressure level: PN6-PN25 (can withstand up to 2.5MPa)
Salt spray corrosion resistance: passed ASTM G85 salt spray test
Connection method: hot melt butt welding, electric fusion welding
(1) Clarify the needs
Purpose: water supply? Cable protection? Sewage discharge?
Environment: Shallow sea/deep sea? Are there reefs?
Pressure requirements: hydrostatic pressure, fluctuating pressure
(2) Key parameter verification
Material grade: PE100-RC (slow crack growth resistance) is preferred
Ring stiffness: SN8 (shallow sea) or SN16 (deep sea)
UV resistance certification: ensure sufficient carbon black (≥2.5%)
1. Focus on marine engineering - formula and process optimized for seawater
2. Strict quality control - each batch of pipes undergoes water pressure and impact tests
3. Global project experience - cooperative customers include Shell, China Communications Construction, etc.
4. High cost performance - more competitive prices compared to European and American brands
If you are looking for a reliable supplier of HDPE pipes for marine engineering, Puhui Industry deserves priority!
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