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Information from inspection and analysis of electric resistance welded galvanized steel pipe after service in residential water systems has resulted in a compilation of observations concerning the development and severity of corrosion leading to failure.
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Ccase histories of four fire protection systems where corrosion resulted in premature discharge/leakage causing significant property damage or facilities downtime. Tuberculation of galvanized piping. Two cases of dealloying (dezincification) corrosion of brass sprinkler heads. Microbiologically induced corrosion (MIC) corrosion.
This report explains different types of corrosion phenomena and contributing factors of corrosion that can occur in fire protection systems (FPS), such as water corrosivity, MIC, trapped air (wet systems), residual water (dry systems), and pipe weld corrosion. The basis for selection of corrosion mitigation strategies for corrosion mitigation and management of FPS are also discussed.
Corrosion that results in pipe leakage or obstruction is the most significant issue for owners of water-based FPS or fire sprinkler systems, in terms of both cost and system reliability. Corrosion damage/products and mineral deposits can impair the effectiveness of sprinkler systems, leaving facilities vulnerable to uncontrolled fire loss even though they are equipped with fire protection systems. This report describes practices that have been successful in mitigating FPS corrosion.
Case study: A Steam Assisted Gravity Drainage facility in northern Alberta, Canada is examined as it experienced two very similar failures in heat exchanger tubes within 2 years of each other due to a boiler feedwater tank without a nitrogen blanket and a low flow condition.