Estimate Friction Factor for Polypropylene Pipes

The major losses of fluid flow in plastic pipes due to friction are usually few or negligible some cases, and this is the assumption that value factor small (small roughness). This work aimed estimate vs Reynolds number compared against previous data, was estimated using an experimental model consisting a polypropylene pipe with nominal outside diameter 16mm length 8.5 meter eighteen elbows connect it, results showed practical coefficient less than Basilius equation for smooth which indicates smoother numerical formula similar . Finally, amount energy lost PPR other types extrusion process makes inner wall smooth, but it cannot be neglected flow.