119 Material Selection 1191 Introduction

Selection of the optimum material for construction is critical in terms of safety, performance, and economic considerations. The basic information used for determining the most appropriate material is derived from laboratory or pilot-plant tests, previous published corrosion data, and in many cases from past experience. It should be recognized that material selection is a compromise and rarely

Material Availability and Cost

Maintainability

Physical Properties

Mechanical Properties

Corrosion Resistance

Fire Resistance

Existence of Previous Knowledge of Design -►

Existence of Previous Knowledge of Design -►

Material

Mechanical Properties

Material

Corrosion Resistance

Suitability for Corrosion Control Measures

Fabrication Requirements

Fire Resistance

FIGURE 11.24 Factors affecting material selection.

is the highest corrosion-resistant material selected. Figure 11.24 highlights the type of information required to formulate decisions on material selection.

Material selection should be seen as an integral part of the design exercise and used in conjunction with a corrosion management strategy. In too many cases corrosion is considered only when damage has occurred; by this time remedial measures may be several times the cost of the original materials. In addition where poor design has led to a corrosion failure, alternative design and not alternative material selection may be the only effective solution.

The choice of materials available to the material selector or design engineer is extensive. In the limits of this chapter only a brief mention will be made of the "popular" engineering materials used extensively for construction. The reader is advised to consult the literature and seek advice from manufacturers and suppliers prior to the application of a given material.

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