... 89.This machine mixes river sand ,tubular products of inner diameter 150-800mm . The tubular products made by this machine ... has the following advantages :average wall thickness ,smooth inner and outer wall ,good impermeability ,high compressive strength , ... . Vertical screw extruding Pipe-Making machineMain Technical parameter (1)Mould diameter (inside mm): φ200, φ300, φ400, φ500, Ø600, 700, φ ...