Analyzing Corrosion And Modeling Of Damage Phenomena For Drinking Water Pipelines

Abstract

Material Corrosion Is A Challenging Problem That Causes Deterioration Of The Device Under Services Such As Water Pipes And Other Buried Structures. Through Pipe Wall Thinning, Corrosion Causes A Loss Of Thickness And Functional Integrity Due To A Variety Of Corrosion Mechanisms. The Primary Difficult Issues Of Buried Water Pipelines Are Galvanic, Uniform, And Pitting Corrosions, In Increasing Order, Among A Range Of Corrosion Types. This Dissertation Aimed To Analyze Corrosion Damage Mechanisms, Characterize Corrosion Morphology, And Modeling Of Damage Phenomena For Ferrous Water Pipelines. To Achieve The Objective, Different Research Works Were Carried Out Including Water Physicochemical Testing, Soil Corrosivity Test, Micro structural Analysis, Modeling Of Corrosion Failure Phenomena, Weight Loss Evaluation, And Corrosion Characterization Methods Used. Characterization Of Corrosion Morphology And Analysis Of Pipes Corrosion Failure Mechanisms Were Studied From Failed In-Situ Conditions Of Buried Ferrous Pipes Which Were Served For 20-40 Years In The Addis Ababa Water Distribution System. To Study The Main Internal Corrosion Mechanisms, Different Laboratory Tests Of Water Physicochemical Investigation Were Employed Utilizing Dr 900, Inolab Ph 7310p, Palintest Photometer 7100, And Miero 800. Similarly, Soil Laboratory Tests Were Used To Investigate Exterior Corrosion Causes. The Long-Run Rate Of Corrosion Was Predicted By Modeling Corrosion Damage Phenomena. The Corrosion Morphology And Microstructures Were Studied Using A Scanning Electron Microscope Jeol, Japan And An Optical Microscope, Respectively. Corrosion Characteristics Such As Maximum Pit Depth, Area, Volume, And Pit Opening Form Were Determined Utilizing Mountains Image Analyzing And Surface Metrology Software. The Results Of Corrosion Characterization Using The Software Were Validated Using A 3d Optical Surface Profilo meter Microscope. Water Physicochemical Test Indicates: Caco3 Is 77 - 215 Ppm, Ph Is 7.05 ?�? 7.86, Total Dissolved Solids Were 84.10 -262.8 Ppm, , Clo2 Is 0 ?�? 0.5 Ppm, Fe3+ Is 0.0 ?�? 0.55 Ppm, And Dissolved Oxygen (80-81 Ppb). From Water Test, The Results Show That The Main Causes Of Internal Pipe Corrosion Damage Mechanisms Were Identified As Dissolved Oxygen, Caco3, Tds, And Clo2. The Amount Of Released Iron Concentration (Fe3+) And Weight-Loss Method Was Used To Assess The Rate Of Pipe Corrosion Damage. Operating Pressures, Water Velocity, Service Load, Deposits, And Water Resistivity All Create Differential Cells That Promote Metallic Pipe Corrosion. The Soil Moisture Content Of 23 To 37.5 Percent, Ph Of 7.04, And Electrical Conductivity Of 0.105 To 313 Ds/M2 Were Recorded In The Soil Laboratory. The Soil Types Had Total Nitrogen Levels As Low As 0.06-0.10. The Major Contributing Factors To External Corrosion Damage Were Found As Soil Resistivity, Moisture Content, Soil Load, And Long-Term Soil Corrosive Rate. The Results Present That The Corrosive Behavior Of Soil On The Buried Iron Pipes Was Moderately Corrosive. Cracks Were Discovered At The Subsurface Of The Pipes After Sem Corrosion Analysis. A Real-Life Water Pipeline Distribution System Was Utilized As A Case Study To Show The Application Of The Proposed Corrosion Model For Validating The Results Against The Current State Of Corrosion-Damaged Pipes. The Plan For Replacing Or Repairing Buried Iron Pipes Requires Knowledge About Environmental Corrosivity, Pipe Performance, And Long-Term Corrosion Rate. To Prevent The Risk Of Corrosion, Water Pipelines Require Regular Inspections, Maintenance, And Applying Corrosion Protection Such As Coating. Water Suppliers And Industry Will Use The Findings Of This Study To Investigate Co