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Case 1: A boiler raising steam by utilising heat from a 7% sulphur dioxide‐in‐air mixture failed because the protective corrugated cast iron shell round the tubes opened, exposing the steel tubes to oxidation. Case 2 next month: Cracking of a 22 in. connecting main between two sulphur trioxide absorbers was found to have resulted from sulphur trioxide passing into the cast iron through the graphite flakes and attacking the adjoining ferrite.
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© MCB UP Limited
1966
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