DS EN 1229:1997 Plastics Piping Systems - Glass-Reinforced Thermosetting Plastics (Grp) Pipes And Fittings - Test Methods To Prove The Leaktightness Of The Wall Under Short-Term Internal Pressure Defines two test methods, designated method A and method B, for rapid testing of the leaktightness of glass-reinforced thermosetting plastics (GRP) pipes and fittings under short-term internal pressur