This European Standard specifies requirements and test methods for fittings of prefabricated thermally insulated pipe-in-pipe assemblies comprising a steel service fitting from DN 20 to DN 1200, rigid polyurethane foam insulation and an outer casing of polyethylene for use in directly buried hot water networks with preinsulated pipe assemblies in accordance with EN 253. This standard covers the following fittings: bends, T-pieces, reducers, single use compensators and anchors. This standard applies only to insulated fitting assemblies and single use compensators for continuous operation with hot water at various temperatures in accordance with clause 1 of EN 253:2003. All fittings shall comply with Annex A of EN 13941. The minimum design pressure of fitting assemblies shall be 16 bar (overpressure) For pressures higher than 16 bar extra calculation shall be necessary. Guidelines for quality inspection are given in annex A of this standard. Procedures for PE-welding are given in annex B of this standard. NOTE This standard does not include rules for calculation of loads and stresses.