HDPE Gas Pipes

I Product Introduction

PE gas pipes are manufactured from high-density polyethylene (HDPE) or medium-density polyethylene (MDPE) resins through an extrusion process, representing a next-generation replacement for traditional steel pipes and PVC gas pipes. The product is suitable for pipe systems with nominal outside diameters ranging from 16mm to 160mm, manufactured using PE100-grade compound materials. The operating temperature range is –20°C to 40°C, with a maximum operating pressure (MOP) not exceeding 1.0 MPa. With outstanding chemical corrosion resistance, low-temperature impact resistance, and stress crack resistance, PE gas pipes are widely used in urban gas distribution networks, industrial gas transmission, and courtyard gas pipeline systems. Featuring a design service life of more than 50 years and reliable jointing technology, they have become the preferred pipe material for municipal gas engineering projects.

I Product Features

1.Reliable connection

POLYGON PE gas pipeline adopts hot-melt welding or electric fusion connection, the joint performance is better than the pipeline.

2.Good chemical resistance

POLYGON PE gas pipeline can resist poor chemical media, and the chemical substances in the soil will not cause any degradation to the pipeline.

3.Good wear resistance and crack resistance

The wear resistance of POLYGON PE gas pipeline is 4 times of steel, and it has good resistance to both rapid crack propagation and slow crack growth.

4.Good flexibility

The flexibility of POLYGON PE gas pipeline makes it easy to bend, which can be adapted by changing the pipeline direction in engineering. Its flexibility can also resist ground subsidence, so it has excellent seismic performance.

5.Aging resistance, long service life

2-2.5% carbon black with uniform distribution can support the pipeline to be stored outdoors or used for 50 years without being damaged by ultraviolet radiation.

I Technical Data

I Product Specification

I Application

● Urban gas distribution networks: Used for main lines and branch lines in medium-pressure and low-pressure municipal gas pipeline networks.

● Residential courtyard gas networks: Suitable for buried courtyard gas pipelines in residential communities and commercial complexes.

● Industrial gas transmission: Used for gas transmission piping systems within factories and industrial facilities.

● Trenchless pipeline rehabilitation projects: Using insertion methods to renovate existing gas pipelines without the need for road excavation.

● Natural gas station pipelines: Used for process piping systems within gas gate stations and pressure regulating stations.

I FAQ

1. What is the service life of PE gas pipes?

Under normal buried service conditions, the design service life of PE gas pipes can exceed 50 years. Their chemically stable structure provides excellent resistance to acids and alkalis, while stray currents and chemical substances in soil have minimal corrosive effects. No special anti-corrosion treatment is required for long-term service.

2. What are the advantages of PE gas pipes compared to steel pipes?

The main advantages include:

① Corrosion resistance: No anti-corrosion coating required;

② Reliable jointing: Butt fusion joint strength exceeds that of the pipe body;

③ Good flexibility: Allows curved installation to accommodate complex terrain;

④ Low investment cost: Lower material cost, reduced construction and inspection costs;

⑤ Longer service life: Over 50 years, compared to 18–20 years for steel pipes.

3. What pressure ratings are PE gas pipes suitable for?

PE gas pipes are suitable for gas transmission systems with a maximum operating pressure (MOP) not exceeding 1.0 MPa. The design stress for PE80 grade pipes is ≤4.0 MPa, while for PE100 grade it is ≤5.0 MPa. The actual working pressure should be calculated based on the pipe’s SDR value and operating temperature.

4. How are PE gas pipes joined, and how is leak-proof performance ensured?

Joining is achieved through electrofusion or butt fusion connections.

● Electrofusion: Pre-embedded resistance wires are heated to fuse the pipe and fitting together.

● Butt fusion: A heating plate melts the two pipe ends, which are then pressed together.

Both methods create a monolithic structure at the joint, with strength exceeding that of the pipe body, fundamentally eliminating the risk of leakage.

5. What is the temperature range for PE gas pipes?

The operating temperature range for PE gas pipes is –20°C to 40°C. The material has an extremely low brittle temperature, preventing brittleness or cracking during winter construction. When the conveyed medium exceeds 40°C, pressure derating should be applied.

6. What is the difference between PE80 and PE100, and how should they be selected?

PE80 and PE100 are classifications based on the Minimum Required Strength (MRS) of polyethylene materials.

● PE100: Has a higher MRS value (10 MPa) with a design stress of up to 5.0 MPa, suitable for medium-high and high-pressure gas networks.

● PE80: Has a design stress of 4.0 MPa, suitable for medium and low-pressure gas networks.

Selection should be based on the design pressure, pipe diameter, and specific project requirements.