PE-RT Ⅱ Heat-resistant Polyethylene Heating Pipes

Detail

A Brand-New Revolution in New Secondary Heat Supply Pipes

Heat-resistant polyethylene (PE-RT II) pipes are a new type of polymer chemical building material. They feature excellent heat resistance, corrosion resistance and impact resistance, as well as good flexibility and sealing performance. They are convenient for construction and maintenance, with a service life of more than 50 years, making them suitable for secondary network systems in central heating.

A secondary heat network refers to a system where hot steam produced or discharged by thermal plants is converted into hot water below 80°C through intermediate heat exchangers, and then transmitted via buried thermal pipelines to radiators in households or buildings for heating. Such a thermal pipeline network is defined as a secondary heat network.

Executive Standards:

(CJ/T 480-2015) Pre-Insulated Composite Plastic Pipes for Direct Buried Installation with Polyurethane Foam and High-Density Polyethylene Outer Casing

(DB64/T 1056-2014) Technical Specification for Application of Pre-Insulated Composite Plastic Pipes for Direct Buried Installation

(GB/T 28799-2012) Heat-Resistant Polyethylene (PE-RT) Piping Systems for Hot and Cold Water Installations in Buildings

Performance Characteristics and Application Advantages of the Product

Service Life of 50 Years
In accordance with the international standard ISO 9080, PE-RT II district heating pipes have a long-term service life of more than 50 years at 80 °C.
Excellent Low-Temperature Brittleness Resistance
The low-temperature embrittlement point of PE-RT II heating pipes reaches -40 °C.
Compared with PPR pipes, they have superior resistance to low-temperature brittleness, eliminating the risk of pipe damage under extreme conditions such as freezing or impact.
Strong Pipeline Transmission Capacity
PE-RT II heat-resistant polyethylene heating pipes have a smooth inner surface without scaling.
The fluid resistance is less than 1/20 that of steel pipes.
Under the same specific friction loss, the heat delivery capacity is at least 25% higher than steel pipes.
Good Thermal Insulation and Low Heat Loss
PE-RT II is a poor thermal conductor, with a thermal conductivity less than 1/10 that of steel.
PE-RT II heating pipes reduce heat loss by at least 50% compared with steel pipes, with heat loss less than 0.1 °C per kilometer.
Light weight, high welding efficiency, low installation cost and fast construction
Uncompensated natural laying, flexible design
Reliable and efficient pipe connection
Like PE water supply and gas pipes, PE-RT II heating pipes can be connected by:

Hot melt connection
Electro-fusion connection
Hot melt socket connection
Flange connection

Safe and reliable pipe repair
Damaged PE-RT II heating pipes can be quickly repaired with electro-fusion fittings, ensuring safe and reliable quality.
Squeezing water-shutoff repair and restoration technology
PE-RT II is a flexible material with excellent resistance to slow crack growth.
The squeezing water-shutoff technology can be used to stop water flow. After repair and repressurization, the pipe will naturally recover due to its memory effect, and the restored pipe still meets long-term performance requirements.
Convenient overhead installation and pipe gallery installation
PE-RT II pre-insulated composite plastic pipes are suitable for various complex basement and pipe gallery installations. Fixed supports and sliding supports are maturely applied, with safe and reliable construction quality.

Performance Comparison between Heat-Resistant Polyethylene (PE-RT II) Direct-Buried Heating Pipes and Steel Pipes

Item	Heat-resistant Polyethylene PE-RT Pipe	Steel Pipe	Remarks
Thermal Conductivity (W/(m·K))	0.4	30-150	? Plastic pipes are insulating materials, reducing the heat loss of the entire piping system to below 5%.
Density g/cm³	0.96	7.75	The density of steel pipes is 8 times that of plastic pipes; plastic pipes are lightweight and convenient for construction.
Pipe Connection	Hot fusion or electrofusion	Electric welding	? No open flame is required for plastic pipes. Hot fusion connection or electrofusion fitting welding is very convenient; ? The construction and installation of plastic pipes are more convenient, and the strength of the weld joint is higher than that of the pipe body; ? Electrofusion fittings require only a small operating space, which can easily solve connections in some narrow areas.
Corrosion Resistance	Excellent	Poor	Plastic pipes can resist media with a pH value of 2-12.
Service Life	≥50 years	<15 years	●Plastic pipes are corrosion-free and non-scaling, and no diameter reduction will occur during their service life, which will not lead to insufficient heat. ●The joints will not suffer from rust perforation.
Comprehensive Cost	Lower	High	●Because steel pipes have high thermal conductivity, once there is an air gap between the insulation layer and the steel pipe, the thermal insulation performance of the entire system will fail. Plastics, on the other hand are poor thermal conductors; even if there is an air gap, they have little impact on the system's insulation effect. In other words, the overall insulation performance of steel pipe insulation relies on a very tight three-layer structure, whereas plastic insulation pipes do not require such stringent tightness for their insulation effect.
Axial Shear Strength (23°C, MPa)	≥0.09	≥0.12	●Because steel pipes have high thermal conductivity, once there is an air gap between the insulation layer and the steel pipe, the thermal insulation performance of the entire system will fail. Plastics, on the other hand are poor thermal conductors; even if there is an air gap, they have little impact on the system's insulation effect. In other words, the overall insulation performance of steel pipe insulation relies on a very tight three-layer structure, whereas plastic insulation pipes do not require such stringent tightness for their insulation effect.
Linear Expansion Coefficient (mm/(m·K))	0.12	0.012	●Plastic pipes are flexible materials that can absorb axial stress through their own deformation, making them more suitable for underground installation. ● They have excellent adaptability to uneven ground settlement.
Modulus & Expansion Force	Modulus decreases with time: 850 MPa at 23°C, 330 MPa at 60°C, 190 MPa at 80°C	206000MPa	●The axial stress caused by thermal expansion and contraction is proportional to the modulus of the material. Plastic pipes have a low modulus, resulting in a small axial force, which is only about 1% of that of steel pipes.
Application Conditions	Secondary heating pipe networks, underfloor radiant heating pipe networks	Can be used for both primary and secondary heating pipe networks	●The softening point of XRT70 material is 126℃. The maximum service temperature of plastic materials is generally 15-20℃ lower than its softening point, so it can be fully used in hot water conditions below 90℃, such as the secondary pipe network of central heating. It has been widely and maturely applied in domestic cold and hot water supply, underfloor heating and radiator heating in buildings.
Operating Temperature	Generally 80°C	Relatively high (generally usable below 300°C)	/
Operating Pressure (MPa)	≤1.0	Relatively high operating pressure	The pressure rating of plastic pipes is closely related to their wall thickness.

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