- Hiline Pre-insulated Steel Pipe



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
  • Refrigerants

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

Metric System:

Seamless Pipe
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

Imperial System:

Seamless Pipe
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.

  •  High-efficiency CFC-free, rigid polyurethane foam insulation
  •  Different thicknesses available (Series 1, 2 and 3)
  •  Available with optional trace or maintained heating cables

Casing Pipes

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

Quality Assured

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.

Surveillance System

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 

World-class Support

At CPV we pride ourselves by the way in which we support our customers – from the moment that they first contact us through to their long-term operation and maintenance of a pre-insulated pipe network. 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.

Design and Stress Analysis

There are many factors that will affect the long-term integrity of a pre-insulated pipe system. Correctly identifying and dealing with the potential for thermal expansion of the pipe system is a critical element of the design process and we employ state-of-the-art sisKMR specialist stress analysis software. This package allows us to configure the pipe routes to keep the thermal expansion within safe limits and conform to the requirements of the EN 13941 standard for Design and installation of pre-insulated bonded pipe systems for district heating.


Training installers, supervisors and maintenance operatives, our brand new training centre allows for not only the theory, but hands-on practical experience in the correct method for installing the Hiline pipe systems.
In addition to this, we also offer training courses in the design, installation, commissioning and maintenance of electronic surveillance systems – including the use of our own buried pipe network, on which we can simulate moisture faults as part of the practical training.

Tool sales and Hire

We offer both the sale and short-term hire of all the specialist tools required to install the Hiline pipe system.

Trace and Maintained Heating Systems Support

In temperature-critical, special applications that require round-the-clock maintenance of a specific media temperature, we can supply the Hiline pipe system with Trace or Maintained Heating systems.

On-site Support Services

Whether it’s on-site training, site supervision or specialist advice, support and maintenance – our engineers are at hand to provide customer support as and when required

Project References

CPV’s Hiline system has been used on projects worldwide for a variety of applications. Below are just a few examples:

  • Academy Central Residential Developments
  • Arup Campus, Solihull, Birmingham
  • Ashley Park Housing Association
  • Astley Ainslie Hospital
  • British Antartic Survey
  • Calendar Park, Scotland
  • Camelford Primary School
  • CEU University, Leeds
  • Edgbaston Priory Club
  • Falkland Islands
  • Government Facilities
  • Lancaster University, New Sports Centre
  • Leicester Citywide DH Network
  • Northwood Barracks, London
  • Rolls Royce, Derby
  • Shenley Wood Retirement Village
  • Swansea University
  • The British Embassy, Harare, Zimbabwe
  • Warwick University
  • York University Accommodation Block

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