Pipe Schedule in Lubrication Systems — What Really Matters
1. First Principle: Velocity Depends on Internal Diameter, Not Nominal Size Two pipes with the same nominal size but different schedules have different internal diameters. Example (for illustration): PipeOD (same)ScheduleID (approx)Effect2” pipesameSch 40larger IDlower velocity2” pipesameSch 80smaller IDhigher velocity Since: V = {4Q}/{pi D^2} A small reduction in ID → large increase in…












