This Technical Specification (CEN/TS) specifies recommended practices for installing piping systems made of glass-reinforced thermosetting plastics based on unsaturated polyester resin (GRP-UP), intended to be used for pressure or non-pressure water or sewerage applications. It is applicable to GRP-UP piping systems of nominal sizes from DN 100 to DN 3000 which are intended to be used for the conveyance of liquids at temperatures up to 50 °C and at pressures of 0,5 bar and greater.NOTE 1 Piping systems conforming to prEN 1796 [4] or prEN 14364 [5] can also be used for above-ground applications provided the influence of the environment and the supports is considered in the design of the pipes and joints.NOTE 2 It is the responsibility of the purchaser or specifier to make the appropriate selections from these aspects, taking into account their particular requirements and any relevant national regulations and installation practices or codes.