The Effect of Pipe Ageing of Different Diameter And Pressure On Residual Chlorine

Abstract

A model was used in predicting the decay of residual or free chlorine along aged pipes and of varying diameters with pressure. The aim of the research was to assess the impact of service age of galvanized iron pipes on residual chlorine including pressure. The effects of ageing pipes of galvanized iron material with varying pipe diameters on residual chlorine were investigated. However, reactions were observed to occur both with the bulk flow and with iron particulates along the pipe walls. The overall dissipation constant, mass transfer coefficient, bulk dissipation coefficient and wall dissipation coefficients were calculated using analytical data obtained from the laboratory for various pipes ages and diameters. The overall dissipation constant increased with increasing Reynolds number. Nevertheless, the application of free chlorine on smaller diameter and aged galvanized iron pipes shows relatively larger wall consumption than pipes of minimum age and that of larger diameter. The research also shows that higher concentration of residual chlorine was observed at higher pressure in smaller age   diameters pipes of longer service years than the large ones of less service year. Hence, this research will help utility and oil production managers simplify their approach in predicting total chlorine residual in aged pipes of varying diameters and pressure effect.