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Pumps are subject to a wide range of corrosion problems. A considerable number of these failures can be grouped into two broad categories. In the first category, some deficiency in fabrication or processing can lead to enhanced corrosion in a normally resistant material. Intergranular attack and corrosion at casting defects are the most common problems of this type. Examples of each are discussed and remedies proposed to alleviate this problem. The second major category of corrosion failures is caused by unanticipated or unrecognized aspects of the environment which adversely affect the material. Examples are discussed wherein corrosion and subsequent cracking occurred as a result of deficiencies in water treatment which allowed the intrusion or buildup of corrodents. The examples presented in this paper illustrate the importance of metallurgical failure analysis as a tool to produce a higher quality, more reliable product.
pump, corrosion, failure, intergranular corrosion, casting defect, grain boundary film, corrosion fatigue, stress corrosion cracking, stray current corrosion
Manager, Materials Engineering, Harrison, NJ