Chapter 8 – Materials of construction
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Publisher Summary
This chapter discusses the selection of right kind of materials for the construction of a firewater pump. The selection primarily depends on the properties of the water source to be used, economics, and the life of the installation. For fresh water sources such as public water mains and fresh water lakes, cast iron is normally adequate although bronze internals may be optional; whereas, highly corrosion-resistant materials and coatings are required for brackish or seawater. The most important environmental conditions to consider when selecting pump materials are the water velocity, galvanic effects, aeration, and marine environments. The use of fiberglass materials in firewater systems is also gaining popularity as they can withstand the harsh marine environmental effects and offer superior corrosion resistance. Periodic underwater inspection and replacement of the anodes are recommended to offset the effect of corrosion in seawater pump risers.