SC Pressure And Process Piping Practice Questions - South Carolina Pressure And Process Piping Contractor Examination Exam

Why should a wet carbon-steel line not be bolted directly to a stainless-steel nozzle without an isolation plan?

The two metals have identical electrochemical potential, so nothing happens Galvanic corrosion can attack the less-noble carbon steel where the metals and an electrolyte meet Stainless always dissolves first, protecting the carbon steel B31.3 requires carbon steel and stainless to share the same hanger clamp

Correct Answer:

Galvanic corrosion can attack the less-noble carbon steel where the metals and an electrolyte meet

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