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Internal Corrosion Control in Water Distribution
AWWA M58 Internal Corrosion Control in Water Distribution Systems is an extensive manual published by the American Water Works Association (AWWA) that provides comprehensive guidance on managing and controlling internal corrosion within water distribution systems. Here's a more detailed description of what the manual covers:
Corrosion Mechanisms: AWWA M58 explores the various mechanisms and factors contributing to internal corrosion within water distribution systems. It discusses corrosion processes such as galvanic corrosion, microbiologically influenced corrosion (MIC), chemical corrosion, and erosion-corrosion, as well as the influence of water quality parameters, pipe materials, and environmental conditions on corrosion rates.
Corrosion Assessment and Monitoring: The manual addresses methods and techniques for assessing and monitoring internal corrosion within water distribution systems. It discusses corrosion monitoring tools, such as corrosion coupons, electrochemical probes, and water quality testing, as well as inspection methods, including visual inspection, non-destructive testing, and pipe condition assessment surveys.
Water Quality Management: AWWA M58 provides guidance on managing water quality to mitigate internal corrosion risks. It discusses factors affecting water corrosivity, such as pH, alkalinity, hardness, dissolved oxygen, chloramine residuals, and disinfection byproducts, and offers recommendations for optimizing water chemistry to minimize corrosion rates and protect pipeline materials.
Material Selection: The manual discusses material selection considerations for minimizing internal corrosion risks in water distribution systems. It covers different pipe materials, coatings, linings, and corrosion-resistant alloys, as well as factors to consider when selecting materials based on water chemistry, service conditions, and lifecycle cost considerations.
Corrosion Control Strategies: AWWA M58 explores various corrosion control strategies and technologies available for mitigating internal corrosion in water distribution systems. It covers techniques such as protective coatings, corrosion inhibitors, cathodic protection, pH adjustment, water treatment additives, and corrosion-resistant materials, discussing their effectiveness, limitations, and applicability to different corrosion scenarios.
Corrosion Monitoring and Maintenance Programs: The manual provides guidance on developing and implementing corrosion monitoring and maintenance programs to proactively manage internal corrosion risks. It discusses strategies for establishing baseline corrosion rates, setting corrosion control targets, implementing corrective actions, and conducting routine maintenance activities to ensure the long-term integrity and reliability of water distribution infrastructure.
Regulatory Compliance: AWWA M58 addresses regulatory requirements and industry standards related to internal corrosion control in water distribution systems. It discusses compliance with regulations such as the Safe Drinking Water Act (SDWA), EPA's Lead and Copper Rule (LCR), and AWWA standards for water quality, corrosion control, and pipeline materials, ensuring that utilities meet legal requirements and best practices for corrosion management.
Overall, AWWA M58 serves as a comprehensive resource for water utility professionals, engineers, consultants, and regulators involved in managing internal corrosion risks in water distribution systems. It provides practical guidance, best practices, and technical information to help utilities identify, assess, and mitigate internal corrosion issues while ensuring the delivery of safe, reliable drinking water to consumers.