Hiline Flex - Pre-insulated PEX Pipe System
A high-performance pre-insulated flexible pipe system for district heating and cooling applications.
Suitable for temperatures up to 95°C and a maximum working pressure of 6 bar, the pipes are available in sizes ranging from 25mm up to 160mm (OD), supplied on rolls of up to 800 metres in length (20mm OD). Available with single and double service pipe configurations within a single outer casing pipe.
The list of applications that are suitable for Hiline Flex is vast, but typically, it is used above and below-ground, on domestic, commercial and industrial sites for conveying:
- District Heating
- Chilled Water
- Potable Water (optional)
- Hot Water (optional)
Manufacture and Standards
Pre-insulated pipes and fittings for thermal utilities are manufactured within an ISO 9001 accredited environment in accordance with EN 15632 Parts 1 and 2.
Cross-linked polyethylene (PE-Xa) in accordance with DIN 16892/93 with an oxygen diffusion barrier (EVOH) in accordance with DIN 4726.
A key component in the efficiency of the Hiline pipe systems is our choice of CFC-free polyurethane foam to provide excellent levels of insulation – in accordance with the demands of the EN 253 standard. Using cyclopentane as the blowing agent, we achieve very-low lambda levels – which result in much-reduced energy losses to the media being conveyed by the service pipe. The effects of using a more efficient insulation don’t appear to be much at face value, but factor in a 30-year life-cycle cost of operating the system and the savings – both financial and environmental – mount up significantly. When looking at the life-cycle-costs of a district heating pipe network, the initial capital investment is typically around ten percent – with the biggest cost being the on-going operation.
- High-efficiency CFC-free, rigid polyurethane foam insulation
Hiline Flex pipe systems are deemed 'Properly Insulated' by the Renewable Heat Incentive (RHI) and therefore meet their strict requirements.
Outer Casing Pipe
The outer casing pipe is manufactured from seamlessly extruded, corrugated polyethylene (PE-LLD).
Site Jointing Techniques
The jointing of PEX pre-insulated pipes can be carried out using the proven PEX-LOK compression-sleeve jointing system - giving a maintenance free, tight fitting joint.
The sealing of casing pipes in the field are carried out with a mechanical, shroud jointing system that enables the easy installation of foam insulation in the joint area.
Hiline systems are manufactured in modern, EN ISO 9001-approved production facilities, using quality-assured materials that comply with all relevant design standards and tolerances for district heating and cooling – such as EN 253, along with any that are pertinent to special applications.
Pipe Coil Trailer Hire
Pipe coils can be delivered to site on a specially-designed pipe coil trailer. These trailers, supplied on a rental basis, enables safe uncoiling and swift installation of Hiline Flex pipes straight into pre-prepared trenches.
Flexible polymer-based pipe systems delivered to site in coils, albeit easier to install than steel systems, can be challenging to safely handle and in using Hiline Flex pipe coil trailers, the process is made much more simple and can reduce the number of operatives required on site. Please contact us for prices and availability.
Pipe Termination Pre-Fitting Service
For clients looking to perhaps link just two buildings, we now offer the choice of a factory-fitted heat shrink end cap and pre-fitted PEX-LOK axial compression termination connector with either a BSP thread or steel weld adaptor. Cutting down installation time and reducing the need to hire specialist tools, the pre-fitting service is available on coils of Hiline Flex with PEX service pipes diameters up to 63mm OD (DN 51.4mm).
Please ask our sales team for details of this service when making an enquiry or placing an order.