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Steel pipe

Pre-insulated steel pipe is a solid and efficient solution for district heating and cooling as well as industrial applications that require high temperature and pressure resistant pipes.
isoplus pre-insulated steel pipes are bonded piping systems consisting of a steel carrier pipe, polyurethane insulation and impact-resistant and break-proof PE-HD jacket pipes – bonded firmly together into a robust sandwich structure.

Steel pipes are insulated with polyurethane foam blown with cyclopentane. This provides optimal insulation value and high compressive strength. Our pre-insulated pipes are suitable for continuous operating temperatures of 143°C (single pipes) and 130°C (double pipes).

We provide single steel pipe dimensions up to ø1200. Steel pipes with jacket dimensions ≤ ø355mm are available as energy-saving continually manufactured pipes with an integrated diffusion barrier between jacket pipe and polyurethane foam. The diffusion barrier protects the foam in isoplus’ pre-insulated pipes against ageing and keeps the heat loss low throughout the service life of the piping system.

Because of the wall thickness, jacket pipes in dimensions > ø355 provide a natural diffusion barrier.


Low heat loss and reduced costs with double pipes

Double pipe consists of two steel pipes – one flow pipe and one return pipe – insulated in the same PE-HD jacket pipe. We can provide double pipes in dimensions up to ø273. Like pre-insulated single pipes, they are efficiently insulated with polyurethane foam and available with diffusion barrier.

The pipe structure ensures improved insulation and, thus, also lower heat loss than single pipes, while the diffusion barrier ensures a permanently low heat loss throughout the service life of the pipe system.

Double pipes are a compact solution, that takes up less space in the pipe trenches and requires fewer joints and assemblies. This also means less excavation work and increased reliability.


Leak detection system

If you require electronic leak detection in your district heating system, isoplus can deliver steel pipes with two copper wires integrated to connect with a leak detection system.



District heating, district cooling, solar heating, community heating, cooling, industry.

Carrier pipe material: Steel P235GH
Jacket pipe material: PE-HD
Insulation: Polyurethane foam, blown with cyclopentane

Max. continuous operating temperature single pipes 143°C
Max. continuous operating temperature double pipes 130°C

On request, isoplus can deliver pre-insulated pipes suited for a continuous operating temperature of 161°C.

Operating pressure: 16 bar
Delivered lengths: 6, 12 og 16 m
Dimensions: 20-600 (25-200 continually)

At isoplus you can always get professional support from project start until the piping system is installed.

We can help with planning, design calculations, installation of joints and installation of leak detection system.

Read more about isoplus service & support.

Contact us

T  +45 6441 6109
E  iso@isoplus.dk

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Case references

Innovative project with new energy station in Tårnby

Tårnby Public Utility paves the way with a new visionary project in which an energy station will become the new gathering point for the area's district heating and cooling. Here the two systems will utilize the energy from the waste water. The plant will be the first...

Five oil villages’ path to sustainable solutions

Lolland Municipality takes the lead in the fight against climate change, as a new district heating project has begun on West Lolland. The municipal’s ambitious climate plan is based on the current energy policy, which includes phasing out oil-fired boilers by 2030 and...

Optimal supply for visionary urban development

In the South Harbour district in Aarhus, the second largest city in Denmark, a new heating transmission line from the Aarhus Heat Plant to Sydhavnsgade is intended to support a major urban development and ensure security of supply to the city. The neighbourhood of the...

Pioneering renewables project in Stirling

Stirling Council's district heating project will be the first in the UK to use a mix of pioneering renewable technologies to turn waste water into energy. A Combined Heat and Power (CHP) unit will supply the network with heating using a heat pump system to deliver...

Greenwich Millennium Village – Sustainable community

Greenwich Millennium Village (GMV) in south-east London is a flagship housing project built on an urban village model to set the standard for 21st century living and to serve as a model for the creation of new communities in England. The initiative aims to create a...

Sheridan College – Optimizing energy consumption

Sheridan College set goals to reduce its energy consumption by 65% and CO2 emission by 45% by 2030. With four separate campuses enrolling 40,000 students, the college focused on reducing the consumption of the two largest campuses. To achieve the project's goals new...

University of Rochester – From steam to hot water

The University of Rochester is one of the country's top-tier research universities. The campuses are home to 200 academic majors, more than 2,000 faculty and instructional staff, and some 10,000 students which yields high requirements for the capacity and safety of...

A sustainable village becomes a reality

In Føns on West Funen, Denmark a vision about sustainable village became a reality. In October 2015, a brand-new wood chip-fueled heating plant was established, which now provides heating for 43 local households. isoplus has supplied the pipes and made the detailed...

Profitable large scale solar heating in Norway

Large-scale solar heating is an important energy resource for counteracting part of the heavily increasing energy prices and the uncertainties related to the future energy supply. Solar heating is important in Norway as well. Investing in solar energy represents new...

HOFOR – great ambitions for the climate

HOFOR provides district heating to the entire City of Copenhagen and covers 98 % of the capital’s heating demand. The supply company has the ambitious goal of delivering 100% CO2 neutral district heating as early as in 2025. Therefore, they are working on replacing...