... have S2, S4, S5 of pipe pressure level 5 series. Nominal diameter from 20 to 160 mm, etc ... with the points, S4, S5 for cold water pipe, series of normal use tube for more than 40 °C the fluid ... temperature, S2 to S3.2 series for normal use hot water pipe, tube, the fluid temperature ... more than 70 °C, for the service life of 50 years Residential pipe system of ...