HDPE pipe and fitting,PVC pipe and fitting

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.

 

Why do marine projects require special HDPE pipes?

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.

 

Puhui Industry Company Profile

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

 

Puhui Industry marine HDPE pipe recommended products

(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

 

How to choose Puhui Industry"s HDPE marine pipe?

(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%)

 

Why choose Puhui Industry?

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

 

 

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.

 

Advantages of HDPE pipes in gas transportation

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.

 

Domestic and foreign standard system for HDPE pipes for gas transportation

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.

 

Key performance indicators of HDPE pipes for gas transmission

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.

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) 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.

 

Main factors affecting the price of HDPE cable protection pipe

(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.

 

How to reduce procurement costs?

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.

 

Purchase suggestions

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.

Official website: www.phtopindustry.com | www.pefitting.net
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 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

 

Specifications of commonly used HDPE pipes for industrial wastewater treatment

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.

 

Specifications of HDPE pipes for special purposes

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.

 

Selection of HDPE pipe connection methods

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

 

Selection considerations

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.

Official website: www.phtopindustry.com | www.pefitting.net
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

 

Core Advantages of HDPE Pipes in Agricultural Irrigation

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

 

Five Key Indicators for Scientific Selection

(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

 

Solutions for Special Working Conditions

(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

 

Cost Optimization Strategies

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

 

Key Quality Control Points for Installation

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%

 

Solutions to Common Problems

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.

Official website: www.phtopindustry.com | www.pefitting.net
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