Hydraulic calculation of pipelines made of polymeric materials
with account of the roughness parameters of the pipe inner surface (for discussion)

Summary

A method of hydraulic calculation and a calculation dependence for determining the coefficient of hydraulic resistance λ with account of the characteristics of pipe wall roughness Ra and S_m that affect the accuracy of calculating the head loss along the length according to the Darcy–Weisbach formula are presented. It is recommended to take into account the values of these parameters in the hydraulic calculation. It is proposed to develop a method of in-process control of the Ra and S_m parameter values for using in standards for pipes made of different polymeric materials. A mathematical dependence is proposed for calculating the equivalent roughness coefficient K_э that depends on the value of the integral roughness parameter Ra. The formula provides for recalculating the Ra value into the K_э value eliminating hydraulic experiments.

Keywords

pressure losses , pipelines made of polymeric materials , pipe wall roughness , method of in-process control of roughness parameters