Radius P

Radius K



Radius P - pre insulated pipe system

Pre-insulated pipe system with steel carrier pipes, PUR thermal insulation and plastic jacket
The main fields of application for Radius P pipe systems include district heating and district cooling networks.

A choice can be made from three different insulation series in order to improve energy efficiency.
To guarantee long-term operational security of the heating network, Radius P pipe systems may be optionally equipped with network monitoring system.

1. Steel carrier pipe
2. Polyurethane foam (PUR)
3. Network monitoring system
4. PE-HD casing

Longitudinal welded steel pipe according EN 10217-2/P235GH
Available in 3 insulation series, with or without foamed-in network monitoring system.

Rod length: 6, 12 und 16 m

technical data (PDF)
RK Infra GesmbH Bogen


RK Infra GesmbH Kugelhahn

ball valve

RK Infra GesmbH Parallel Abzweiger

t-branch parallel

RK Infra GesmbH 45 Grad Etage

t-branch 45 degree

Joint Connection - Welding system

Inductive welding procedure for the insulation of Radius P pipe systems.
This patented welding system provides an uninterrupted and homogenous welding connection between the PE-HD casing and the INDUCON sleeve.

Technical advice accompanying throughout the entire duration of the project

Click here for the contact form

Radius K Special pipe program

Solutions for individual tasks

Where the standard program is no longer sufficient, properties and geometry of the pipes are adapted to the requirements of the application. This is done in close cooperation with our customers. Thanks to our flexible production even complicated systems can be delivered promptly.

Upon request and agreement with our technical department carrier and jacket pipe type can be freely combined.

RK Infra GesmbH Knalrohr mit Spiromantel

PVC -Sewer-SP

RK Infra GesmbH Knalrohr mit Spiromantel


RK Infra GesmbH Knalrohr mit Spiromantel


RK Infra GesmbH Knalrohr mit Spiromantel


If desired and agreed with our technical department, the medium and casing pipe types can be freely combined.

Carrier pipes

  • Galvanized pipes
  • Stainless steel pipes
  • Hard copper pipes in rods
  • Multilayer pipes
  • Cast iron pipes
  • PEX-pipes, DVGW tested
  • PE-HD pipes
  • PVC pipes
  • Other by the client supplied carrier pipes


  • Folded spiral-seam pipe
  • Steel pipes
  • Stainless steel pipes
  • PE pipes
  • GRP pipes
  • Other by the client supplied jacket pipes

Heating cable / Heating cable channel

The execution of the heating type (heating cable or hot water tempering) can be selected depending on the requirements.

Do you have a special request?

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New bedding material to reduce heat loss.

District heating pipes are used buried for heating networks up to 130 ° C hot water temperature. In the trench they are laid in a sand bed, resulting in a temperature gradient from the pipe to the edge of the chute as a result of the heat loss. With the innovative thermal sand, the heat losses compared to conventional cable sand can be significantly reduced.

Lambda cable edge: 1.5 – 1.7 W / m ° K
Lambda Thermosand: 0.177 W / m ° K

System Description

KELIT – Thermosand is a new type of bedding material which has the same mechanical properties and a significantly lower thermal conductivity than conventional quartz sand.

technical data (PDF)

By using Thermosand (lambda: 0.33W / m ° K), the same losses are to be expected for a series 1 insulation pipe as when using insulation series 3 pipes with conventional cable sand. This considerably reduces the heat losses in the tube zone.



Thermosand is a ground waste material from former coal mining areas in Styria, which was formed by thermal conversion of coal residues and is similar to fired clay as “natural clinker”.



Naturally fired, reddish peat material (natural clinker) with high pore number, ground and on grain size 0/3 mm. These micro cavities only reach a water saturation level of max. 84% (on average approx. 65%). The remaining cavities are filled with air and cause good insulation properties.


  • high porosity ensures much better insulation (dry and wet !!!)
  • mechanically stable
  • sufficiently available



Soil mechanical suitability:

The soil mechanical suitability was determined by extensive tests on the technical University of Graz (TUG) at the Institute of Soil Mechanics and Foundation Engineering. (Test No. 2045).

In a comparative assessment, the suitability of the thermosand® as a backfill material, which have the necessary properties to fulfill the tube statistics requirements according to ÖNORM EN 13941 must, confirmed.