District heating pipes. Bonded twin pipe systems for directly buried hot water networks - Factory made fitting and valve assemblies of steel service pipes, polyurethane thermal insulation and one casing of polyethylene1 Scope This document specifies requirements and test methods for fittings of factory made thermally insulated bonded twin pipe assemblies for hot water networks in accordance with EN 139411, comprising two steel service fittings and or valves, polyurethane foam thermal insulation and one casing of polyethylene. The pipe assembly can also include the following additional elements: measuring wires, spacers and diffusion barriers. This document covers

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This document is applicable to systems where the components are interconnected by electrical wires or optical fibre or by radio frequency links or by any combination

The procedure of this standard allows for the measurement of integrity and if required the measurement of radiation and thermal insulation

ISO 20078‑3 is the third part of the multi-series standard that defines how to authenticate users and Accessing Parties on a web services interface

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