I Product Introduction
HDPE fittings are manufactured from high-density polyethylene resin through precision injection molding and serve as specialized connection components for use with HDPE pipes. The products strictly comply with national standards and cover a full range of specifications, including electrofusion fittings, butt fusion fittings, flange adapters, and grooved-type fittings. Manufactured from the same PE100-grade compound material as the pipes, the fittings are fused with the pipes using electrofusion or butt fusion jointing technology, resulting in joint strength that exceeds that of the pipe body. Widely used in municipal water supply and drainage, gas transmission, industrial piping, and building drainage systems, they ensure long-term safe operation of pipeline systems through reliable joint performance and a design service life of more than 50 years.
I Product Description
Product Features
Leak-Proof: Fusion creates permanent, integrated connections
Flexibility: Adapts to ground movement and seismic activity.
Corrosion Resistance: Resists chemicals and soil erosion.
Durability: 50-year service life under standard conditions.
Product Classification
By Connection Method
Welding Connection Fittings
Mechanical Connection Fittings
Flange Connection Fittings
By Processing Method
Injection Molding Fittings (e.g., small-bore socket fittings for OD ≤ 110mm)
Welded Fittings (for large-diameter or non-standard angles)
By Function
Butt Welding Fittings (Elbows, Tees, Flanges)
Electrofusion Fittings (Couplers, Reducing Tees)
Socket Fittings (with rubber seals for easy installation and Bronze nickel-plated metal)
I Product Feature
● Integrated connection, zero system leakage: Using electrofusion or butt fusion processes, the fittings and pipes form a fully integrated structure after fusion, with no interface or weak points at the joint. The weld strength exceeds that of the pipe body, fundamentally eliminating the risk of joint leakage.
● Same material, consistent performance: Fittings are manufactured from the same PE100-grade compound material as the pipes, ensuring complete consistency in material properties throughout the piping system, with identical coefficients of thermal expansion and no interface stress during long-term service.
● Excellent stress crack resistance: Outstanding resistance to environmental stress cracking, with low sensitivity to notches and scratches. Maintains structural stability under complex geological conditions and temperature variations, suitable for trenchless installation and old pipeline rehabilitation.
● Corrosion-resistant and maintenance-free: Excellent resistance to chemical media such as acids and alkalis, with no susceptibility to electrochemical corrosion. Buried installation requires no special anti-corrosion treatment, with a service life of more than 50 years.
● Complete range, strong applicability: The product line comprehensively covers electrofusion couplers, electrofusion elbows, electrofusion tees, butt fusion flanges, grooved fittings, repair clamps, and other types, meeting various engineering connection requirements.
● Excellent low-temperature performance: Maintains good toughness during construction and operation in cold regions, with no risk of brittleness or cracking.
I Product Specification
I Application
Municipal water supply networks: Used for pipe connections in urban water supply mains and distribution networks, paired with electrofusion or flange fittings.
Gas transmission systems: Specialized connection fittings for buried gas pipelines, utilizing electrofusion welding technology to ensure absolute safety in gas transmission.
Municipal drainage and sewage systems: Used for pipe connections in stormwater and sewer networks, with options for electrofusion or grooved connections.
Building drainage systems: Suitable for indoor and outdoor building drainage pipeline systems, with grooved HDPE fittings specifically designed for this application.
Industrial piping systems: Used for connecting pipelines conveying corrosive media in industries such as chemical, electroplating, and metallurgy.
Trenchless pipeline rehabilitation: Used for connections in insertion method construction during the renewal and rehabilitation of existing pipelines.
I FAQ
1. How are HDPE fittings connected to HDPE pipes, and what connection methods are available?
There are three main connection methods:
● Electrofusion connection: Suitable for diameters dn20–dn315, using pre-embedded resistance wires to heat and fuse the components together.
● Butt fusion connection: Suitable for large diameters of dn90 and above, where the end faces are heated and then pressed together.
● Mechanical connection: Such as grooved coupling connections, used in building drainage systems.
Electrofusion and butt fusion create an integrated structure between the fitting and the pipe, with joint strength exceeding that of the pipe body.
2. What is the service life of HDPE fittings?
Under normal buried service conditions, the design service life of HDPE fittings can exceed 50 years. They have an oxidation induction time of ≥20 minutes (at 200°C) and excellent resistance to environmental stress cracking, ensuring stable long-term performance.
3. What temperature ranges are HDPE fittings suitable for?
This depends on the application:
● Water supply and gas pipelines: Suitable temperature range –20°C to 40°C.
● Building drainage pipelines: Suitable temperature range –40°C to 65°C, with instantaneous drainage temperatures not exceeding 95°C.
HDPE has a brittle temperature as low as –60°C, posing no risk of brittleness or cracking in cold regions.
4. What is the difference between electrofusion fittings and butt fusion fittings, and how should they be selected?
Electrofusion fittings: Contain embedded resistance wires and are heated using an electrofusion welding machine to fuse the inner wall with the pipe. Suitable for small diameters (dn20–dn315) and applications involving complex conditions or confined spaces.
Butt fusion fittings: Use a heating plate to melt the end faces, which are then pressed together. Suitable for large-diameter (dn90 and above) straight pipe connections.
Selection should be based on pipe diameter, construction conditions, and site environment.
5. Can HDPE fittings be used for gas pipelines, and what special requirements apply?
Yes, but fittings must be manufactured from PE100 or PE80 gas-grade compounds and comply with the GB/T 15558.2 standard. HDPE gas fittings are black with yellow stripes and must be joined using electrofusion. Welding parameters must be strictly set according to the fitting’s barcode to ensure weld quality.
6. What applications are grooved HDPE fittings suitable for?
Grooved HDPE fittings are specifically designed for building drainage systems, including wastewater, sewage, and rainwater drainage pipes in buildings. They feature quick installation, removability, and adaptability to temperature-induced deformation, making them particularly suitable for suspended indoor drainage pipelines.
7. How can the welding quality of HDPE fittings be ensured?
Key control points:
① The welding surfaces must be scraped to remove the oxide layer;
② Keep the welding surfaces clean and dry;
③ Strictly set welding time according to the parameters on the fitting barcode;
④ Allow sufficient cooling after welding (forced cooling is strictly prohibited);
⑤ Conduct visual inspection (uniform bead formation) and, where necessary, perform tensile testing for verification.
