Corrosion of steel is a serious and continuing problem and the diagnostic engineer and any means of estimating its severity and possible consequences if neglected is a useful diagnostic tool. Clearly a careful visual examination looking for obvious structural defects such as cracks, indents, gouges and similar items is a necessity and the diagnostic engineer should also note any defective, worn or corroded rivets, cracked welding and the presence and size of any existing doubling plates. He should then examine the structure for any pitting, noting its type and the probable reason for its presence and get an estimate of: - 1. its extent in area. 2. its severity. 3. the mean depth of the pits.
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