Investigation of scaling and corrosion potential of drinking water distribution network using Langelier saturation Index (LSI) and Ryznar Stability Index (RSI) in Meshginshahr city in 2019

Corrosion and scaling is one of the major and daily problems in the operation of water facilities and causes problems such as water loss, shortening the life of the facility, creating holes in the pipes, clogging, and pressure loss in the water supply network. Therefore, the purpose of this study is to determine the corrosion and scaling potential of drinking water supply sources in Meshginshahr. This descriptive cross-sectional study was conducted during the two seasons (summer and winter) in 2019. A total of 20 samples which were obtained by averaging 100 samples, were analyzed to determine the corrosion and scaling potential of water resources using Langelier and Ryznar indices in Meshginshahr. The results showed that the annual average of Langelier and Ryznar indices were -1.34 and 10.03, respectively, and the sources of drinking water supply in Meshginshahr were in corrosion and scaling state. Comparison of indicators and results obtained from this study showed that Meshginshahr water has corrosive properties, so it is necessary to constantly study the water supply sources of city and try for adjusting the pH and control other factors affecting corrosion, including concentrations of chloride, dissolved oxygen, and sulfate.