This document provides requirements and test methods for flexible, factory made, buried district heating pipes systems with plastic service pipes and no bonding between the layers of the pipe assemblies. It shall be used in conjunction with part 1. This document is valid for maximum operating temperature of 95 °C and maximum operating design pressure up to 1,0 MPa for a design lifetime of at least 30 years. This document does not cover surveillance systems. In conjunction with the other parts of EN 15632, this document is applicable to pipes, fittings, their joints and to joints with components made of non-plastics materials intended to be used for district heating installations. NOTE For higher temperatures or for the transport of other fluids, for example potable water, additional requirements and testing is needed. Such requirements are not specified in this document.