According to API RP 571, in the section on Boiler Water Condensate Corrosion:
“The major contributors to condensate corrosion are dissolved CO₂ and O₂. Carbon dioxide forms carbonic acid in the presence of water, lowering pH and causing generalized corrosion.”
“Oxygen causes pitting and localized corrosion unless chemically treated.”
Thus, option B (Carbon dioxide and oxygen) is the primary root cause and the correct answer.
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