A pre-insulated rigid steel pipe system for district heating, cooling and special applications
A rigid, bonded pre-insulated steel pipe system in accordance with EN253. Suitable for district heating, cooling and special applications and temperatures up to 130°C continuous. Available in metric and imperial sizes – from 20mm to 1200mm NB, supplied in 6 and 12 metre lengths with an optional Steel Flex system on rolls.
The list of applications that are suitable for Hiline Steel is vast, but typically, it is used above and below-ground, on domestic, commercial and industrial sites for conveying:
- District heating
- Chilled water
- Process Fluids
Manufacture and Standards
Hiline Steel (Metric) pre-insulated pipes and fittings for thermal utilities are manufactured within an ISO 9001 accredited environment in accordance with EN 253, EN 448, EN 488, EN 489, EN 13941
Hiline Steel (Imperial) pre-insulated pipes and fittings for thermal utilities are manufactured within an ISO 9001 accredited environment generally in accordance with EN 253, EN 448, EN 488, EN 489
Hiline Steel Flexible (Metric) pre-insulated pipes and accessories for thermal utilities are manufactured within an ISO 9001 accredited environment in accordance with EN 15632-4
Certified seamless steel pipe manufactured in accordance with EN 10216-2 Grade P235 GH, EN 10216-1/A1 Grade P235 TR1 & P235 TR2, DIN 1629 Grade St 37.0
Seamed Pipe (Welded)
Certified seamed (welded) steel pipe manufactured in accordance with EN 10217-2/A1 Grade P235 GH, EN 10217-5/A2 Grade P235 GH, EN 10217-1 Grade P235 TR1 or P235 TR2, DIN 1626 Grade St 37.0
Certified seamless carbon steel pipe manufactured in accordance with EN 10217-1:API5L Grade B/X42 Schedule 20 or Schedule 40 & EN 10217-1:ASTM A106 Grade B Schedule 20 or Schedule 40.
Seamed Pipe (Welded)
Certified welded carbon steel pipe manufactured in accordance with EN 10217-1:EN 10255 Grade S195T Heavy gauge or Medium gauge (formerly BS1387) & EN 10217-1:API5L Grade B/X42 Schedule 20 or Schedule 40.
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 (see foot of page).
- High-efficiency CFC-free, rigid polyurethane foam insulation
- Different thicknesses available (Series 1, 2 and 3)
- Available with optional trace or maintained heating cables
Hiline Steel pipe systems are deemed 'Properly Insulated' by the Renewable Heat Incentive (RHI) and therefore meet their strict requirements.
Casing pipe is manufactured in accordance with standard EN 253 from high density polyethylene (HDPE)
- Density 950 kg/m³
- Upper yield stress 19 MPa
- Elongation at break at least 350%
- Expected life at least 50 years
HDPE casing is also available with additional UV stabiliser offering greater protection against direct sunlight for
above ground installations
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.
When installing Hiline Steel systems, it is recommended that an electronic surveillance system is included in order to constantly monitor the insulation for the ingress of moisture. This provides peace of mind that should the outer casing be damaged by future street works, the presence of groundwater in the insulation can be picked up, located and repaired before any damage is caused to the service pipe. We offer full support for the main types of surveillance technologies, including the Nordic, Brandes and HDW systems.
Tough Outer Casing
- High Density Polyethylene (HDPE) casing on standard systems
- Barrier-pipe casing available for use in contaminated ground
- UV-stable, above-ground casing options available
Strong and secure fittings
- Range of secure joints and fittings available
- HDPE electro-fusion and heat-shrinkable case jointing options