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

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

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1   Scope

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.