With the acceleration of urbanization and the adjustment of energy structure, the construction of gas transportation pipelines has ushered in a period of rapid development. Among the many pipe options, high-density polyethylene (HDPE) pipes have become one of the preferred materials in the field of gas transportation due to their excellent performance. HDPE pipes have significant advantages such as corrosion resistance, light weight, convenient construction, and long service life, and have gradually replaced the application of traditional metal pipes in gas transportation.
However, as a high-risk field, gas transportation has extremely strict requirements on the performance and quality of pipes. To this end, domestic and foreign standardization organizations have formulated a series of standard specifications specifically for HDPE pipes for gas transportation. These standards not only stipulate the basic performance indicators of pipes, but also put forward comprehensive requirements for raw materials, production processes, testing methods and application conditions. In-depth understanding of these standards and specifications is of great significance to ensure the safety of gas transportation and promote the rational application of HDPE pipes.
HDPE pipes have multiple significant advantages in the field of gas transportation, which make them an ideal alternative to traditional metal pipes. First, HDPE pipes have excellent corrosion resistance and can resist erosion by various chemicals in the soil. They will not suffer from electrochemical corrosion like metal pipes, which greatly extends the service life of the pipes. Secondly, HDPE materials have excellent flexibility and impact resistance, can adapt to geological changes such as foundation settlement and earthquakes, and reduce the risk of pipeline rupture.
In addition, HDPE pipes are light in weight, easy to transport and install, and can be seamlessly connected using hot-melt connection technology, greatly reducing the difficulty and cost of construction. The inner wall of HDPE pipes is smooth, the friction coefficient is small, and the transmission capacity is about 30% higher than that of metal pipes of the same caliber, which can significantly reduce the energy consumption of gas transportation. Most importantly, the design service life of HDPE pipes can usually reach more than 50 years, which is much higher than traditional pipes and has significant economic benefits.
The main international standards for HDPE pipes for gas transportation include ISO 4437 "Plastic Pipe Systems for Gas Transportation - Polyethylene" and EN 1555 "Plastic Pipe Systems for Gas Transportation - Polyethylene" series of standards. ISO standards are international general standards, while EN standards are widely used in Europe. These international standards have detailed provisions on the material properties, dimensional requirements, physical and mechanical properties, chemical resistance and other aspects of HDPE gas pipes.
The standard system for HDPE pipes for gas in my country is mainly based on the GB 15558 "Buried Polyethylene (PE) Pipeline System for Gas" series of standards. The standard is divided into three parts: the first part is pipes, the second part is pipe fittings, and the third part is valves. In the process of formulating the GB 15558 standard, international advanced standards were referred to, and at the same time, combined with my country's actual situation, the technical requirements, test methods, inspection rules, etc. of HDPE gas pipes were comprehensively stipulated. Compared with foreign standards, my country's standards have stricter requirements on certain performance indicators, such as adding specific requirements for carbon black dispersion.
HDPE pipes for gas transmission must meet a series of key performance indicators to ensure safe and reliable operation. The first is the material performance requirements, including the performance of the base resin and the use of additives. The base resin must be a dedicated PE100 or PE80 grade with an appropriate melt flow rate and molecular weight distribution. The additive system must contain sufficient antioxidants, UV stabilizers and carbon black, of which the carbon black content is usually required to be between 2.0% and 2.5%, and the dispersion must meet specific standards.
In terms of mechanical properties, HDPE gas pipes must have sufficient long-term hydrostatic strength, usually requiring a 165-hour hydrostatic test and a 1000-hour slow crack growth test. Environmental stress cracking resistance (ESCR) is another key indicator, usually requiring a notched dead load tensile test of not less than 500 hours. In addition, the pipe must have good fluid transportation performance, including low gas permeability and a flow resistance coefficient that meets the requirements.
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High-density polyethylene (HDPE) pipe is widely used in underground cable protection projects due to its excellent corrosion resistance, impact resistance, flexibility and long life. HDPE cable protection pipe can effectively prevent the cable from mechanical damage, chemical corrosion and groundwater infiltration, and is convenient for later maintenance and expansion. This article will comprehensively analyze the price of HDPE pipe for underground cable protection from the aspects of price influencing factors, market conditions, and purchase recommendations.
(1) Raw material cost
The main raw material of HDPE pipe is high-density polyethylene resin, and its price is greatly affected by fluctuations in the international crude oil market.
Adding modified materials such as UV resistance and flame retardants will increase the cost.
(2) Pipe specifications
Pipe diameter (DN): The larger the pipe diameter, the more material is used and the higher the price (for example, DN110 is 30%-50% more expensive than DN50).
Wall thickness (SDR value): SDR11 (thick wall) is 20%-40% more expensive than SDR17 (thin wall).
Ring stiffness (SN value): SN8 (high stiffness, suitable for deep burial) is 10%-30% more expensive than SN4 (ordinary stiffness).
(3) Production process
Ordinary single-wall pipe: lower price, suitable for general burial environment.
MPP (modified polypropylene) pipe: better high temperature resistance, but the price is 30%-50% higher than HDPE pipe.
(4) Quality certification
Pipes certified by ISO 9001, CE, ROHS, etc. are usually 10%-20% higher than ordinary products.
(5) Purchase volume and transportation cost
Bulk purchase (such as more than 1,000 meters): a certain discount can be enjoyed.
Transportation distance: Long-distance transportation will increase logistics costs, especially for large-diameter pipes.
Choose specifications as needed: SDR17 or SN4 can be selected for non-heavy load environments to reduce costs.
Bulk purchase: A one-time purchase of more than 1,000 meters can get a bigger discount.
Communication optical cable protection: Single-wall pipe (SDR11) can meet the needs.
High temperature environment (such as power plants): It is recommended to use MPP pipe, which can withstand temperatures above 90°C.
Corrosive soil: Choose HDPE pipe with anti-corrosion agent added to extend service life.
The price of HDPE pipe for underground cable protection is affected by multiple factors such as specifications, materials, brands, and purchase volume. Reasonable selection, bulk purchases, and attention to market trends can effectively control costs. It is recommended to give priority to quality certification and applicable scenarios when purchasing, rather than simply pursuing low prices, to ensure the long-term reliability of the project.
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High-density polyethylene (HDPE) pipes have become one of the preferred materials for industrial wastewater treatment systems due to their excellent performance. The main advantages include:
Excellent corrosion resistance: Can withstand various acids, alkalis, salts and organic solvents, suitable for treating industrial wastewater with complex components
Excellent impact resistance: Not easy to crack even in low temperature environments
Good flexibility: Can adapt to a certain degree of foundation settlement
Long service life: Design service life can reach more than 50 years
Smooth inner wall: Small friction coefficient, strong conveying capacity and not easy to scale
Reliable connection: Hot-melt connection forms an integral structure without leakage risk
Environmental protection and safety: The material is non-toxic and does not pollute water quality
1. Pipe diameter specifications
The diameter range of commonly used HDPE pipes in industrial wastewater treatment systems:
Small diameter pipes: DN20-DN200 (used for dosing systems, sampling lines, etc.)
Medium diameter pipes: DN250-DN600 (mainstream process pipelines)
Large diameter pipes: DN600-DN2000 (used for plant main pipelines, discharge pipelines, etc.)
Ultra-large diameter: DN2000 and above (special engineering applications)
2. Pressure level
Select pipes of different pressure levels according to the system working pressure:
PN0.6MPa: low pressure system, such as gravity flow pipelines
PN0.8MPa: general pressure system
PN1.0MPa: medium pressure system
PN1.25MPa: higher pressure system
PN1.6MPa: high pressure system, such as pumping pipelines
3. Wall thickness standard
HDPE pipe wall thickness is usually divided into SDR (standard dimension ratio) series:
SDR11: thick wall pipe, strong pressure bearing capacity
SDR17: medium wall thickness, balanced economy and strength
SDR26: thin wall pipe, used in low pressure system
Specific wall thickness can refer to GB/T 13663.2-2018 standard.
4. Material grade
HDPE pipe produced from PE100 grade raw materials is recommended for industrial wastewater treatment, which has higher long-term hydrostatic strength and crack growth resistance.
1. Chemical corrosion resistant pipes
For industrial wastewater containing highly corrosive components, the following should be considered:
Select PE100 RC (stress cracking resistance) material
Increase the wall thickness design margin (reduce the SDR value by one level)
Consider a special anti-corrosion layer for the inner lining (such as PP lining)
2. High-temperature wastewater pipes
When the wastewater temperature exceeds 40°C:
Select high-temperature resistant HDPE material (such as PE-RT)
The pressure level needs to be increased by one level
Consider thermal expansion compensation design
3. Underground buried pipes
Ring stiffness selection: SN8 or above (SN12.5 or above for heavy-load areas)
Consider the outer anti-corrosion layer (such as double-wall corrugated pipe structure)
The relationship between burial depth and load needs to be calculated.
Select the appropriate connection method according to the pipe diameter and engineering requirements:
Hot-melt butt: suitable for DN≥90mm pipes, high connection strength
Electrofusion connection: suitable for various pipe diameters, easy to install
Flange connection: required to connect with metal equipment
Socket connection: commonly used for small-diameter pipes
1. Water quality characteristics analysis: understand wastewater pH value, chemical composition, temperature and other parameters
2. Hydraulic calculation: determine pipe diameter and pressure loss
3. Environmental factors: consider burial conditions, ambient temperature, earthquake level, etc.
4. Standard compliance: ensure that the product complies with standards such as GB/T 13663 and ISO 4427
5. Economic evaluation: balance initial investment and long-term operating costs
Correctly selecting HDPE pipe specifications is crucial to the long-term stable operation of industrial wastewater treatment systems. Engineering designers should select the most suitable HDPE pipe specifications based on specific wastewater characteristics, process requirements and site conditions, combined with relevant standards and specifications, while considering the convenience of installation and maintenance and the full life cycle cost, to provide reliable transportation guarantees for wastewater treatment systems.
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HDPE (High-Density Polyethylene) pipes have become the preferred choice for modern agricultural irrigation systems due to their outstanding advantages:
Exceptional Weather Resistance: UV-resistant additives ensure over 20 years of outdoor use without aging
Superior Flexibility: Can withstand ground settlement with seismic resistance 5 times that of steel pipes
Ultra-Low Water Delivery Loss: Inner wall smoothness of 0.009mm, with friction coefficient only 1/3 of steel pipes
Eco-Friendly and Safe: NSF certified, fully compliant with drinking water standards
Cost-Effective and Durable: 40% lower overall cost than steel pipes with a service life of 50 years
(1) Golden Rules for Pipe Diameter Calculation
Flow Rate Formula:
Q=π×(D/2)²×v×3600
(Q: m³/h; D: Pipe diameter in m; v: Flow velocity in m/s)
Flow Velocity Control Standards:
Branch pipes: 0.6-1.0m/s
Main pipes: 1.0-1.5m/s
Maximum not exceeding 2.5m/s
Common Specification Reference Table:
Irrigation Area (acre) | Drip Irrigation System | Sprinkler System | Main Pipeline |
Below 50 | Φ32-50mm | Φ63-75mm | Φ90-110mm |
50-200 | Φ50-63mm | Φ75-90mm | Φ110-160mm |
200-500 | Φ63-75mm | Φ90-110mm | Φ160-200mm |
(2) Pressure Rating Selection Guide
Pressure Loss Formula:
hf=λ×(L/D)×(v²/2g)
(λ value: 0.02-0.03)
Pressure Rating Recommendations:
Irrigation Type | Working Pressure | Recommended Rating | Safety Factor |
Drip Irrigation | 0.15MPa | PN0.8 | 1.5 |
Micro Spray | 0.25MPa | PN1.0 | 1.6 |
Sprinkler | 0.5MPa | PN1.6 | 1.8 |
Hub Project | 0.8MPa | PN2.0 | 2.0 |
(3) Advanced Material Selection Guide
PE100 vs PE80:
Strength: PE100 is 25% stronger than PE80
Cost: PE100 is 15-20% more expensive
Application Scenarios:
Drip irrigation branch pipes: PE80
High-pressure main pipes: PE100
Anti-Aging Performance:
Standard type: 3 years outdoor lifespan
UV-resistant type: Contains 2.5% carbon black, lifespan 20+ years
Recommendation: Above-ground sections must use UV-resistant type
(1) High-Sediment Water
Choose SDR11 thick-walled pipes
Maintain flow velocity above 1.2m/s to prevent sedimentation
Install sediment traps every 500m
(2) Cold Climate Areas
Use low-temperature impact-resistant PE-RT material
Burial depth ≥ frost line +20cm
Implement electric heat tracing systems
(3) Slope Irrigation
Use SDR17 series for slopes >15°
Install pressure relief valves every 50m
Use flange-type anchor blocks for fixation
Pipe Diameter Combination Plan:
Main pipes: PE100 PN1.6
Branch pipes: PE80 PN1.0
Capillary pipes: PE40 PN0.6
Procurement Techniques:
Bulk purchase discounts: >5000 meters can get 20% off
Seasonal procurement: 10-15% lower prices in winter
Direct factory purchase eliminates middleman margins
Hot Melt Welding Parameters:
Temperature: 210±5℃
Pressure: 0.15-0.3MPa
Time: Pipe diameter ×10 seconds (mm)
Pressure Testing Standards:
Strength test: 1.5× working pressure, hold for 1 hour
Leak test: 1.1× working pressure, hold for 2 hours
Backfill Requirements:
First layer: 20cm fine sand bedding
Compact in layers (each layer ≤30cm)
Compaction density ≥90%
Water Hammer Effect:
Install slow-closing check valves
Set up pressure regulating towers
Use SDR26 thin-walled pipes to absorb impact
Algae Growth:
Choose black opaque pipes
Regularly inject sodium hypochlorite solution
Install UV sterilizers
Rodent Damage:
Use HDPE material with rodent repellent
Burial depth ≥80cm
Use protective sleeves for critical sections
Through scientific selection, HDPE irrigation systems can achieve 30% water savings, 25% energy savings, and 15% yield increase. We recommend involving professional irrigation engineers at the planning stage and adopting EPC mode to ensure optimal system performance.
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Company address: Room 802, 8th Floor, Building 5, Jinyin Modern City, Jinshui District, Zhengzhou City, Henan Province, China
HDPE (High-Density Polyethylene) pipes can be connected in various ways depending on engineering requirements, pressure ratings, and construction conditions. Below are the common HDPE pipe connection methods and their characteristics:
Application: Pressure pipe systems (e.g., water supply, gas pipelines)
Advantages: Strong sealing, high joint strength (close to the pipe material itself)
Disadvantages: Requires specialized equipment and trained operators
Type | Key Steps | Applicable Pipe Sizes |
Butt Fusion | Heats pipe ends to a molten state, then presses them together (requires trimming, temperature control at 200-220°C) | DN20-DN1200 |
Electrofusion | Uses fittings with built-in heating wires (automated temperature control, suitable for confined spaces) | DN20-DN400 |
Socket Fusion | Simultaneously heats pipe end and fitting before insertion (common for small-diameter pipes) | DN20-DN110 |
Application: Temporary projects, non-pressure pipelines, or repairs
Advantages: Quick installation, detachable
Disadvantages: Requires periodic sealing inspection
Type | Features |
Flange Connection | Bolted flange connection with gasket sealing, suitable for valve/equipment connections |
Clamp Coupling | Uses stainless steel clamps to compress rubber seals, ideal for emergency repairs or connecting different materials |
Compression Fitting | Seals via threaded compression, typically used for small pipes (DN ≤ 63) |
Method | Description |
Steel-Plastic Transition Fitting | Connects HDPE to metal pipes (internal sealing and anti-pullout structure) |
Heat-Shrink Sleeve Connection | Uses a heat-shrink sleeve to seal joints by flame heating (common for cable protection pipes) |
Pressure pipelines: Prefer heat fusion (Butt Fusion > Electrofusion)
Non-pressure pipelines: Mechanical connections are more economical (e.g., clamp couplings for drainage pipes)
Special environments:
Underground concealed works → Heat fusion
Confined spaces → Electrofusion
Temporary projects → Flange/Clamp connections
Clean pipe ends before heat fusion to avoid contamination.
Mechanical connections require periodic seal inspection (recommended replacement every 5 years).
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Company address: Room 802, 8th Floor, Building 5, Jinyin Modern City, Jinshui District, Zhengzhou City, Henan Province, China