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District heating pipe installation

Heating networks with pre-insulated pipes: section replacements, new connections and repairs to existing networks.

District heating pipe installation FIG. 01
Short answer

We install district heating networks with pre-insulated pipes (steel service pipe, polyurethane foam insulation and a polyethylene jacket): excavation, laying on a sand bed, welding and insulating the joints, backfilling and reinstatement. We work for heating operators, homeowner associations and builders, based on the client's design and permits.

01Scope

What the service includes

  1. 01

    Setting out & excavation

    Machine-dug trench, with shoring where required and existing services located beforehand.

  2. 02

    Bedding & laying

    Pipes laid on a sand bed, at the levels and spacing in the design.

  3. 03

    Welding & joints

    Carrier pipes welded, joints closed with sleeves and foamed on site.

  4. 04

    Leak-detection system

    Moisture-detection wires connected through every joint and checked for continuity.

  5. 05

    Testing

    Pressure test and checks recorded in signed reports.

  6. 06

    Backfill & reinstatement

    Protective sand, warning tape, compacted backfill and surface reinstatement.

02Details

Details

What pre-insulated pipes are

Modern district heating networks use pre-insulated pipes: a steel service pipe that carries the heating medium, wrapped in a thick layer of polyurethane foam and protected by a high-density polyethylene jacket. The system reduces heat losses and protects the pipe from moisture and corrosion. The network is usually laid in pairs — flow (hot) and return.

Who we work with

We work for district heating operators, builders, homeowner associations and private clients, based on the technical design and the permits obtained by the client. If you need help with the paperwork, we will tell you which documents are required.

03Technical notes

Technical notes

System
Bonded pre-insulated pipes: steel carrier, polyurethane (PUR) foam, HDPE outer casing — flow and return.
Diameters
As per design.
Installation
Open trench, on a sand bed of at least 100 mm, with at least 100 mm of sand cover above the casing.
Joints
Welded carrier pipe; heat-shrink or electrofusion sleeves with local foaming.
Thermal expansion
As per design — expansion pads, L/Z bends or compensators.
Checks
Pressure test, detection-wire insulation and continuity test, acceptance report.
Documentation
Work carried out on the basis of the approved design and the network operator’s approvals.

Values are indicative; exact parameters are set by the design.

Typical cross-section through a district heating trench Two pre-insulated pipes on a sand bed, protective sand, warning tape, compacted backfill and surface reinstatement, with dimension lines. F R H 100 Øe 100 ≥150 B 01 02 03 04 05 06 07 A–A RH-TD-01
Fig. — Typical section A–A through the trenchDimensions in mm · indicative, not to scale

04Process

How the work runs

01

Design review & site visit

We review the design, the route and existing services, and agree outage windows with the network operator.

02

Site set-up & excavation

Signage, site access and protection of existing services, then the trench is opened in stages.

03

Installation, welding, testing

Laying, welding, sealing joints and connecting the detection system, followed by pressure testing.

04

Backfill, reinstatement, handover

Compacted backfill, surface reinstatement and handover with acceptance reports.

05FAQ

Questions about this service

Do you work on live networks?
Work on live networks is carried out only in coordination with the district heating operator, within the shutdown windows it sets.
Who supplies the pipes?
We can work with materials supplied by the client or procure them ourselves to the design specification. The option chosen is stated in the quote.
How deep are the pipes laid?
Burial depth is set by the design, based on diameter, traffic loads and existing services. We follow the design levels and check them throughout the work.
What are pre-insulated pipes?
They are steel pipes factory-wrapped in a layer of polyurethane foam and a polyethylene jacket. They reduce heat losses and protect the pipe from moisture, which is why they are today’s standard for district heating networks.

Quote request

Planning a project? We’ll reply within 24 hours.

Send us the location, a short description and, if possible, a few photos. We’ll come back with questions or a site visit date.

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