Vylon Technical Sheet: Slipliner Flow Comparison for Concrete Pipe
The resulting flow capacity after the sliplining of an existing pipe can be compared to the flow capacity of the existing pipe by ratios of the n values and the diameters. The following derivation of the Manning's Equation is used to determine the ratio of the existing flow to the Slipliner flow:
The only variable in the above equation is the value of Manning’s n. The Manning's n depends on many factors, such as corrosion, sliming, and joint offsets, which occur in aged sewers. A typical n for an aged concrete sewer is 0.024. The Manning’s n for Vylon Slipliner is 0.009 and a mature Vylon Slipliner can be conservatively estimated at 0.011.