API RP 751, which governs HF alkylation units, specifies:
“The total residuals of chromium, nickel, and copper in carbon steel used in HF service should be less than 0.15 wt.% to minimize corrosion risk.”
“Higher residuals increase the reactivity and corrosion rate of carbon steel in the presence of HF acid.”
(Reference: API RP 751, Section 5.3 – Materials Specification for HF Units)
Therefore, option A is the correct choice.
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