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A highly-efficient reinforced pre-insulated pipe system that’s perfect for district heating applications at higher pressures than a standard PE-Xa pipe.

Hiline FibreFlex is a pre-insulated, flexible pipe system, with a service pipe made of fibre-reinforced, cross-linked polyethylene and PUR thermal insulation. Thanks to the aramid fibre mesh, the pipe wall thicknesses could also be reduced and, due to the resulting smaller outside diameter, the insulation could be improved. Compared to conventional flexible pipe systems, media can be transported at a pressure of 10 bar at a continuous operating temperature of + 80 °C.

Efficient Insulation

FibreFlex pipes are insulated in one continuous manufacturing process, using a CFC-free bonded polyurethane foam with an outstanding thermal conductivity value of l≤0.021 W/mK at 50°C. As the insulation layer has a lower thermal conductivity than conventional pre-insulated steel pipes (l=0.07 W/mK), in diameters up to 80mm, FibreFlex system’s heat loss is lower than insulation series S3 pipes and in larger diameters, heat loss is lower than series S2 pipes. When compared to conventional, bonded pre-insulated PE-Xa pipes, the heat loss can be up to 17% lower for the FibreFlex systems and even better when compared to non-bonded pipes.

Technical Specifications

FibreFlex
Max continuous operating temperature (30 years) 80°C
Max peak operating temperature 95°C
Maximum Operating Pressure (30 years) 10 bar at 80°C
The FibreFlex pipe system is certified to OFI CERT ZG 200-2 Class Technical Specification, in line with EN 15632-2

Secure Joining System

FibreFlex system is quick and easy to join using specially designed compression fittings, incorporating a unique polymer sleeve, which is inserted between the fitting’s outer sleeve and the service pipe. A steel insert is then easily fitted inside the pipe, without the need for the pipe end to be expanded. This provides a robust connection with maximum joint integrity.

Complete System

The Hiline FibreFlex system has a comprehensive range of fittings and accessories to ensure that it can be adapted to suit all possible configurations – including transitions to pre-insulated pipe systems with different types of service pipe – such as steel.

Complete System

The Hiline FibreFlex system has a comprehensive range of fittings and accessories to ensure that it can be adapted to suit all possible configurations – including transitions to pre-insulated pipe systems with different types of service pipe – such as steel.

On-Site Flexibility

The service pipe’s reduced wall thickness the system more flexible to install, significantly increasing its range of application in district heating systems.

Hiline FibreFlex - UNO

NOTE: Series 2 insulation thicknesses are shown below, however Series 1 insulation thicknesses are also available.

Size Service pipe Nominal Outer casing
(d x s mm) (DN mm) (D mm)
25/ 91 25.0 x 2.2 20.6 91
32/ 91 32.0 x 2.5 27.0 91
40/ 111 40.0 x 2.8 34.4 111
50/111 47.6 x 3.6 40.4 111
63/126 58.5 x 4.0 50.5 126
75/142 69.5 x 4.6 60.3 142
90/162 84.0 x 6.0 72.0 162
110/182 101.0 x 6.5 88.0 182
125/202 116.0 x 6.8 102.4 202
140/202 127.0 x 7.1 112.8 202
160/225 144.0 x 7.5 129.0 225

Hiline FibreFlex - DUO

NOTE: Series 2 insulation thicknesses are shown below, however Series 1 insulation thicknesses are also available.

Size Service pipe Nominal Outer casing
(d x s mm) (DN mm) (D mm)
25 + 25/ 111 2 x 25.0 x 2.2 20.6 + 20.6 111
32 + 32/126 2 x 32.0 x 2.5 27.0 + 27.0 126
40 + 40/142 2 x 40.0 x 2.8 34.4 + 34.4 142
50 + 50/162 2 x 47.6 x 3.6 40.4 + 40.4 162
63 + 63/182 2 x 58.5 x 4.0 50.5 + 50.5 182
75 + 75/202 2 x 69.5 x 4.6 60.3 + 60.3 202

Training and Support

As manufacturer, it’s important to us to ensure that our systems deliver exceptional performance throughout their working life. Therefore, we have established an array of world-class support services that help our clients every step of the way.
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CPD Programme

CPV Ltd is CIBSE-accredited provider of CPD courses for Pre-insulated Heat Network Design and Specification
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