Hiline GRE - Pre-insulated GRE Pipe System

A pre-insulated rigid GRE pipe system for district heating, cooling applications
Hiline GRE is a rigid, pre-insulated glass reinforced epoxy (GRE) pipe system specifically developed for the next generation of district heating and cooling networks. Capable of operating at temperatures and pressures previously only achievable with steel systems, it offers outstanding thermal performance coupled with exceptional levels of reliability.
Available Dimensions
(9m / 11.89m lengths)
Pipes are supplied with factory-prepared taper spigot/socket ends.  Larger diameters, up to DN600mm, are available on request
Please Note:
Glass Reinforced Epoxy (GRE) Service Pipe
A composite pipe manufactured from helical-wound glass fibre reinforced epoxy material that is designed for use in heating and cooling networks. Offering a minimum life of 25 years when operating at 120°C at 10 bar, the service pipe will accommodate pressures of up to 20 bar and details of service life at other temperature and pressure combinations can be found on the table opposite.
Tough Outer Casing
Manufactured in HDPE to the requirements of the EN253 standards, the tough and resilient outer casing enables the pipe to be buried directly in the ground – so ensuring the network’s insulation integrity is maintained throughout its service life.
High-Performance Insulation
A layer of CFC-free rigid polyurethane foam provides outstanding insulation properties, with values of 0.022 W/mK and with the insulation thickness according to the Series 1 requirements of EN 253. With the service pipe and outer casing being bonded together by the foam insulation, the system far out-performs other systems with an air gap. With this increased efficiency, comes lower heat loss and therefore a saving in both operational costs and carbon emissions.
For even greater efficiency, Hiline GRE pipe systems are also available with increased insulation thickness to series 2 and series 3.
Complete System
Hiline GRE has a comprehensive range of pre-fabricated bends, tees, fittings and accessories that enable it to be adapted to meet all possible configurations – including transitions to other types of pre-insulated pipe systems – such as Hiline Steel or Hiline Flex. Hiline GRE can be offered as off-site pre-fabricated fittings and spool assemblies to meet a client’s bespoke requirements – significantly reducing installation time and cost.