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CPV’s next generation pre-insulated pipe system brings to market the most efficient solution to further enable heat networks to play their leading role in the drive to decarbonise heat

As a pioneer in the advancement of polymer piping systems, CPV has developed an extensive portfolio of solutions that have served both past and current heat network generations, challenging convention and driving efficiencies. Built on this experience, Hiline Clover now offers the optimal solution to drive the efficiency of fourth and even fifth-generation ambient loop heat networks.

Innovative Joints

Clover service pipe jointing is by means of proven fusion welding by either butt-fusion or electro-fusion technologies. Casing pipe joints also offer the option of electro-fusion oversleeves. An innovative Clover ClickWeld system allows for pipe and fitting assemblies to be supplied with factory-fitted electro-fusion connections – offering fast track site installation as a push-lock-fuse process.

Easier to Integrate

Hiline Clover is part of a wider range of advanced pre-insulated pipe systems that provide seamless interconnectivity. This also applies to other manufacturers' systems with service pipes in materials such as steel, polymers, etc.

Easier to Integrate

Hiline Clover is part of a wider range of advanced pre-insulated pipe systems that provide seamless interconnectivity. This also applies to other manufacturers' systems with service pipes in materials such as steel, polymers, etc.

Tough Outer Casing

Hiline Clover is distinguishable by its light grey outer casing with permanent, orange-coloured identification stripes. This casing is manufactured from a high-strength polymer material to provide exceptional mechanical properties and resistance to all ground conditions for a full, uncompromised service life.

Lowering CAPEX and OPEX

Not only more environmentally aligned to meet net-zero carbon heating demands over that of conventional products, but through innovation, Hiline Clover will also help drive down the cost of both the installation and the operation of heat networks. Using technologically advanced and proven polymers technologies, it meets and exceeds all the criteria demanded of future generations of heat network distribution systems.

Fast & Secure Joining

Hiline Clover pipes are joined with a proven, fusion welding technology and so can be supplied as spigot-ended pipes and fittings assemblies with the options of either butt-fusion or electrofusion welding.

Alternatively, pipes and fitting assemblies can be supplied with the unique factory fitted ClickWeld system which allows for pipes to be clicked and locked together and then fusion welded with integrated electrofusion technology. This reduces the number of site welds and therefore installation times and risk.

These polymer fusion welding technologies are more cost effective than conventional steel welding and will help address the significant skill shortage that challenges the industry.

Heat Loss

Hiline Clover utilises a water-blown PUR foam with a Lambda value of 0.021 W/mK and is manufactured with an insulation thickness aligned with Series 2 within EN253 standards. When compared with typical pre-insulated carbon steel Hiline Clover demonstrates an improved thermal efficiency and therefore reduces heat losses.
Clover Savings vs Traditional Steel Systems
Hiline Clover
Maximum Continuous Operating Temperature +80°C
Operational Service Life +50 years
Peak Operating Temperatures up to +95°C
Maximum Operating Pressure 10 Bar
Thermal Conductivity 0.027 W/mK
Service Pipe PP-RCT
Thermal Insulation PUR / CFC free / water blown

Comprehensive Range

Hiline Clover offers sizes from DN20 to DN250, with continuous operating temperatures up to 80°C and peaks up to 95°C. The system’s performance capabilities and trouble-free 50-year service life expectancy are validated by compliance with international material performance standards.
It is compatible with CPV’s other ranges of pre-insulated composite polymer pipe systems to provide both flexible pipes and large diameter pipes up to DN600.

Efficient insulation

Arguably the most thermally-efficient pre-insulated piping solution, Hiline Clover is insulated with environmentally-friendly water-blown PUR insulation, having exceptional thermal conductivity values and configured to minimise heat loss.

Efficient insulation

Arguably the most thermally-efficient pre-insulated piping solution, Hiline Clover is insulated with environmentally-friendly water-blown PUR insulation, having exceptional thermal conductivity values and configured to minimise heat loss.

Unique DUO

With both the flow and return pipes having a unique ‘stadium’ shaped single casing pipe, it offers maximum thermal efficiency whilst minimising piping insulation materials. This allows trench widths to be reduced and thereby lowering the cost of installation.

Hiline Clover UNO

Size Bore/s (mm) Casing (mm)
DN20 19.4 110
DN25 24.9 110
DN32 31.1 125
DN40 38.9 125
DN50 49.0 140
DN50/65 58.3 160
DN65/80 70.0 180
DN80/100 85.6 225
DN100 97.2 250
DN125 124.4 280
DN150/200 175.0 355
DN200/250 217.8 450
DN250 245.0 500
* Bore dimensions based on SDR9 pipe and with also SDR11 available on request

Hiline Clover DUO

Size Bore/s (mm) Casing (mm)
2 x DN20 2 x 19.4 110 / 168
2 x DN25 2 x 24.9 110 / 171
2 x DN32 2 x 31.1 125 / 200
2 x DN40 2 x 38.9 125 / 205
2 x DN50 2 x 49.0 140 / 234
2 x DN50/65 2 x 58.3 160 / 268
2 x DN65/80 2 x 70.6 180 / 305
2 x DN80/100 2 x 85.6 225 / 380
* Bore dimensions based on SDR9 pipe and with also SDR11 available on request

Hiline Clover Ambient

Size Bore/s (mm)
DN40 40.9
DN50 51.5
DN50/65 61.4
DN65/80 73.6
DN80/100 90.0
DN100 102.3
DN125 130.9
DN150/200 184.1
DN200/250 229.1
DN250 257.7
* Bore dimensions based on SDR11 pipe and with also SDR9 available on request

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.

CPD Programme

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

Electronic Surveillance Systems

We offer full a range of systems and supporting services for the main types of surveillance technologies, including the Nordic, Brandes and HDW systems.

CarboSeal Relining System

We are the UK representatives of the innovative CarboSeal relining system for buried heat networks. This enables failing networks to be repaired without the need to excavate the entire sections of pipe.

The Hiline Range

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Product Catalogues

Hiline Clover Overview