In modern pipeline engineering, the connection between HDPE (high-density polyethylene) pipes and steel pipes is a common technical requirement. Due to the significant differences in the properties of the two materials, how to achieve a safe and reliable connection has become the key point in the implementation of the project. This article will systematically introduce the connection methods, technical points and precautions of HDPE pipes and steel pipes.
1. Flange connection method
Working principle:
Welding PE flange joints at the end of HDPE pipes
Welding steel flanges at the end of steel pipes
Connection is achieved by bolting
Implementation steps:
Hot-melt connection of HDPE pipe ends to PE flanges
Welding matching steel flanges at the end of steel pipes
Installing sealing gaskets between the two flanges
Tightening bolts evenly and symmetrically
Advantages:
Reliable connection, strong pressure bearing capacity
Convenient for later maintenance and disassembly
Wide application range (commonly used for pressure pipes)
2. Socket and spigot connection method
Working principle:
Using steel conversion joints
One end is designed as a socket to connect HDPE pipes
The other end is designed as a spigot to connect steel pipes
Implementation steps:
Insert HDPE pipe into the socket of the joint and fix it by hot-melt
Welding steel pipes to the spigot end of the joint
Adding sealing rings to enhance sealing when necessary
Advantages:
Easy and quick installation
Applicable to small and medium-sized pipes
Relatively low cost
3. Threaded connection method
Applicable conditions:
Small diameter pipes (DN≤110mm)
Low pressure working system
Implementation points:
HDPE pipe end hot-melt threaded PE joint
Steel pipe end processing matching external thread
Use sealing tape to enhance sealing
Precautions:
Not suitable for high pressure pipes
Seal status needs to be checked regularly
1. Selection of transition joints
Material should comply with GB/T 13912 standard
Pressure level should match pipeline design requirements
Interface size should be accurately measured and confirmed
2. Hot melt connection process control
Temperature control: 200-220℃ is appropriate
Pressure control: 0.15-0.3MPa
Time control: adjusted according to pipe diameter
3. Anti-corrosion treatment
Steel pipe welding parts need to be treated with anti-corrosion
Anti-corrosion coating or heat shrink sleeve can be used
Contacts of dissimilar metals should be insulated
4. Stress relief measures
Set flexible joints or expansion joints
Add piers at pipeline bends
Long-distance pipeline segment connection
Preparation before construction:
Check the quality certification documents of pipes and fittings
Measure and record the interface size
Clean the connection parts
Installation process control:
Maintain the concentricity of the connection parts
Avoid strong assembly
Perform pressure test according to the requirements of the specification
Safety matters:
Pay attention to fire prevention during hot melt operation
Take good protection when welding steel pipes
Set up warning signs in the operation area
Appearance inspection:
No visible defects in the connection parts
Anti-corrosion layer intact
Flange bolts are tightened evenly
Pressure test:
Strength test: 1.5 times the design pressure
Tightness test: 1.1 times the design pressure
Other tests:
Ultrasonic testing when necessary
Check the welding quality of hot-melt joints
The connection between HDPE pipe and steel pipe is a key technical node in pipeline engineering. Only by selecting the appropriate connection method and strictly controlling the construction quality can the long-term safe operation of the pipeline system be ensured. In actual projects, the most economical and reliable connection scheme should be selected according to factors such as pipeline specifications, working pressure, and medium characteristics, and construction and acceptance should be carried out in strict accordance with relevant specifications and standards.
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
HDPE pipe (high-density polyethylene pipe) is widely used in municipal water supply and drainage, gas transmission, agricultural irrigation, industrial pipelines and other fields due to its advantages such as corrosion resistance, impact resistance, good flexibility and long life. Compared with traditional steel pipes, cast iron pipes and PVC pipes, HDPE pipes have the following outstanding features:
1. Strong corrosion resistance: not affected by acid, alkali, soil, and microorganisms, and the service life can reach more than 50 years.
2. Compression and impact resistance: good flexibility, can adapt to foundation settlement, and not easy to break.
3. Light weight and easy construction: lighter than metal pipes, low transportation and installation costs.
4. Environmentally friendly and non-toxic: meets food grade standards and can be used for drinking water transportation.
5. Convenient connection: hot-melt butt or electric fusion connection, good sealing and no leakage risk.
As a professional HDPE pipe manufacturer, we provide HDPE pipe products with direct supply from the source, preferential prices and reliable quality, covering water supply pipes, drainage pipes, gas pipes, dredging pipes and other types to meet the needs of different projects.
1. Lower price, no price difference between middlemen
The factory direct sales model eliminates the links of agents and distributors, directly benefits customers, and provides industry competitive prices, which is especially suitable for large-scale procurement of projects.
2. Complete specifications and customized production
Diameter range: DN20-DN2000, to meet different flow requirements.
Pressure level: PN0.6MPa-PN2.5MPa, to adapt to different pressure requirements.
Special customization: special HDPE pipes such as UV-resistant, flame-retardant, and enhanced can be provided.
3. Strict quality inspection and quality assurance
The raw materials are made of high-quality PE100/PE80, which meets national standards such as GB/T 13663 and ISO 4427.
The production line is fully automated to ensure uniform wall thickness, no bubbles, and no impurities.
Each batch of products passes hydraulic test, impact test, ring stiffness test, and provides quality inspection report.
1. Municipal engineering: urban water supply and drainage, rainwater and sewage pipe network, integrated pipe gallery.
2. Gas transmission: PE gas pipe, safe and leak-proof, resistant to high pressure.
3. Agricultural irrigation: drip irrigation and sprinkler irrigation systems, strong weather resistance and long life.
4. Industrial pipelines: corrosion-resistant transmission pipes in chemical, electric power, mining and other fields.
5. Communication sheath pipe: protect optical fiber cables, flexible and pressure-resistant.
1. Clear purpose: different uses such as water supply, drainage, gas, cable sheath, etc. have different requirements for pipes.
2. Select pressure level: select PN0.6MPa, PN1.0MPa or higher pressure pipes according to working pressure.
3. Pay attention to ring stiffness: buried drainage pipes need to choose high ring stiffness pipes such as SN8 and SN10 to prevent deformation.
4. Look for regular manufacturers: check production qualifications and test reports to avoid inferior products.
Contact us to get a quote for HDPE pipes!
Puhui is a professional HDPE pipe manufacturer, providing one-stop services such as wholesale, customization, and technical consultation. If you have HDPE pipe procurement needs, please call us or inquire online, we will provide you with the best solution!
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