SPIRAL CORRUGATED POST-TENSION TUBE/PIPE MAKING MACHINE ZH-150 This is machine is special for producing round & flat corrugated ducts used in expressway, bridge, train and large-span post-tension concrete project. It is suitable for both indoor and site work. Main technical data Metal Strip 36mm Metal Thickness 0.25-0.3mm Diameter ￠40-￠110mm Distance 26mm Seam Form Double Locks Pressure 380V Weight 350kg Size 1500*1000*1200mm Speed 9m/min