Pre-insulated pipe made of PUR (rigid polyurethanic foam) protected by an outer jacket, and a fibre reinforced carrier pipe (SDR II) in PP-RCT WOR with high resistance against high temperature and oxidation process, especially suitable for mechanical installations: heating, air conditioning and compressed systems, transport of technological fluids. The high performance of the raw materials used makes it possible to install systems with pipes of lower thickness compared to conventional ones, thus increasing the total water flow. air