Abstract
Three unusual forms of ‘tell‐tale’ inlet impingement attack (slot, star and crescent) are described, together with examples of other similar interesting forms of attack. The paper is based on direct observations made in the field and on examination of samples returned to the laboratory. These investigations have revealed several factors, not previously reported, which can affect corrosion in heat exchangers. This paper, not previously published, has been revised since the author presented it to the first International Congress on Metallic Corrosion.

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