The PPR pipe making machine adopts the specialized high efficient wear-resistant extruder for PPR raw materials, which ensures high speed extrusion and guarantee the long service life of extruder. • High precise gravimeter control system of is applied in this PPR pipe production line. • It is used for measuring & calculating and precise control of pipe weight perimeter and its extrusion output, to realize the constancy of pipe weight. • The application of this system can shorten the start-up time, improve the produced pipe quality, and save raw material.