This specification establishes the materials and performance requirements for flexible, pre-insulated piping intended for hot and chilled water applications. Piping system may include one or more carrier pipes within a common outer jacket and shall be supplied in coil form. Carrier-pipe, thermal-insulation, and protective-jacket material shall be continuous and uniform throughout the coil while connections and joints in the carrier pipe and the protective jacket shall not be allowed within the coil. The pipe assembly shall be subjected to end seal and bending force tests for water infiltration inspection and to ensure the flexibility of the piping system, respectively.