PE-RT II Type Flexible Pre-Insulated Pipe for District Heating

High-Performance Flexible Piping System for Secondary Heating Networks & Building Connections

Product Overview

The PE-RT II Type Municipal Heating Pipe is a flexible, pre-insulated piping system designed specifically for district heating secondary networks, building service connections, and underground hot water transmission. Combining a high-temperature-resistant PE-RT II (Polyethylene of Raised Temperature Resistance, Type II) carrier pipe with advanced polyurethane foam insulation and a durable outer protective casing, this system offers a reliable, energy-efficient, and cost-effective solution for modern heating infrastructure.

Designed as a superior alternative to traditional steel pipe systems, PE-RT II provides exceptional corrosion resistance, flexibility, and long-term durability, making it the preferred choice for municipal heating projects worldwide.

System Structure

The PE-RT II pre-insulated pipe features a three-layer composite construction:

This integrated structure ensures long-term operational reliability while maintaining low thermal conductivity and high resistance to external loads.

Key Technical Advantages

• High Temperature & Pressure Resistance
  PE-RT II material enables continuous operation at temperatures up to 95°C, with the ability to withstand peak temperatures of 110°C. It maintains stable performance under pressures typical of district heating secondary networks, ensuring reliable hot water delivery.

• Superior Corrosion Resistance
  Unlike steel pipes, PE-RT II is completely immune to electrochemical corrosion, rust, and scaling. This eliminates the need for cathodic protection systems, reduces maintenance costs, and significantly extends service life beyond that of traditional metal piping.

• Exceptional Flexibility
  The inherent flexibility of PE-RT II allows the pipe to be coiled and delivered in long lengths, reducing the number of joints required. It accommodates thermal expansion naturally without the need for expansion loops or compensators, simplifying installation and lowering material costs.

• Low Thermal Conductivity
  The polyurethane foam insulation layer achieves a thermal conductivity as low as 0.023 W/(m·K), effectively minimizing heat loss during transmission. This translates to improved system energy efficiency and reduced operating costs for district heating networks.

• Leak Detection System Compatible
  The system can be integrated with optional leak detection wires embedded in the insulation layer, enabling continuous monitoring of pipeline integrity. Early warning of water ingress allows for timely intervention, preventing system failure and minimizing repair costs.

• Long Service Life
  Designed for a service life exceeding 50 years under normal operating conditions, PE-RT II piping systems offer long-term reliability with minimal maintenance requirements.

• Lightweight & Easy Installation
  Significantly lighter than steel equivalents, PE-RT II pipes reduce transportation costs, require less heavy lifting equipment, and enable faster installation. The ability to use butt fusion welding creates homogeneous, leak-proof joints that match the strength of the pipe itself.

Applications

Our PE-RT II Type Municipal Heating Pipe is widely used in:

• District Heating Secondary Networks
  Distribution pipelines from heat exchange substations to end-user buildings

• Building Service Connections
  Underground connections between district heating mains and residential or commercial buildings

• Geothermal Heating Systems
  Buried piping for ground-source heat pump applications

• Industrial Hot Water Transport
  Process water and industrial heating applications requiring corrosion-resistant piping

• Urban Infrastructure Renovation
  Replacement of aging steel heating networks with modern, maintenance-free PE-RT II systems

• Hotel, Hospital & Campus Heating Networks
  Reliable hot water distribution for large-scale facility complexes

Installation Method

PE-RT II pipes are joined using butt fusion welding, which creates seamless, monolithic joints that are as strong as the carrier pipe itself. The outer HDPE casing is sealed using electrofusion or heat-shrinkable sleeves, ensuring continuous water-tight protection. Installation can be performed using either:

• Open Trench Method: Traditional excavation with sand bedding and backfill

• Trenchless Installation: Directional drilling or pipe pulling for minimal surface disruption

The system's flexibility allows for installation in curved alignments, reducing the number of fittings and potential leak points.

Quality Assurance

All products are manufactured under strict quality control systems in accordance with international standards. Our PE-RT II pipes undergo rigorous testing for:

• Hydrostatic pressure resistance at elevated temperatures

• Thermal insulation performance (thermal conductivity)

• Long-term creep rupture strength

• Fusion joint integrity

• Dimensional accuracy and concentricity

Compliance with applicable industry specifications ensures consistent quality, safety, and reliable performance across municipal heating infrastructure projects.