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For a Handbook devoted to the removal of suspended contaminants, there is no better way to start than with the strainer, whose function is entirely that of protecting downstream items of equipment, or downstream processes, from the impact of
impurities that may block narrow passageways or abrade sensitive surfaces.

Strainers offer a simple method for the protection of pipeline systems, by removing debris such as dirt, swarf, weld sputter, scale and so on. They are simple coarse filters using perforated plate or wire mesh as the filter medium. Strainers fall broadly into two categories: temporary strainers and permanent strainers.

It is true that many types of filter could act as a strainer but it is rare that the straining function (unless at very low cut-points) needs anything more complicated or expensive than the simple units described here.