BS EN 448:2025

This standard BS EN 448:2025 District heating pipes. Bonded single pipe systems for directly buried hot water networks. Factory made fitting assemblies of steel service pipes, polyurethane thermal insulation and a casing of polyethylene is classified in these ICS categories:

• 23.040.40 Metal fittings
• 23.040.07 Pipelines and its parts for district heat
• 23.040.45 Plastics fittings

This document specifies requirements and test methods for factory made thermally insulated bonded fitting assemblies for hot water networks in accordance with EN 13941-1, comprising a steel service pipe, in most cases a steel fitting, polyurethane (PUR) foam thermal insulation and a casing of polyethylene. The fitting assembly can also include the following additional elements: measuring wires, spacers and diffusion barriers. This document specifies the characteristics of the following fitting assemblies: - bends, T-pieces, and reducers. This document applies to fitting assemblies with a design pressure of at least 1,6 MPa.