VAPOURS can condense out as liquids on to surfaces which are below the dewpoint of the gases in their immediate vicinity. When these liquids are capable of causing corrosion, it is important to know the temperature range over which condensation may occur, so that steps can be taken to limit its effect. The corrosive effects of flue gases are due in part to the condensation of sulphuric acid, which can seriously affect the useful life of the materials used in heat exchangers and stacks.
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