PREMANT district heating pipe

Rigid Foam Beams

PRE 6.357

Nominal Size

1

Characteristics

Material

Compressive strength

Density

Thermal conduction

group

Size

Length

100x100mm 1000mm

Value

Unit

Polystyrol

150

kPa

30

kg/m

3

040

Rigid foam beams serve as a support for preinsulated jacket pipes in the pipe trench. PU-rigid foam beams can remain in

the sand

filled pipe trench.

For large pipelines rigid foam beams are only limited useable. They tend to break under the heavy load if they lay hollow.

The additional effort for a plane trench bottom is in most cases not justi

fiable. German Pipe suggests for pipelines from

DN 250 to use sandbags, sand beds or square timbers.

While aligning the pipeline using square timbers it is necessary to remove the square timbers after finishing the welding

works and before the sand back-

filling. Otherwise the jacket pipe may be damaged due to the thermal expansion.

17.1.2025 BGP

Subject to technical changes