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Mistake & recovery · #078

Connecting two different metal types (galvanized to stainless) without dielectric separation

2nd YearDuct Systems

Dissimilar metals in contact create galvanic corrosion, especially in wet environments. Use a non-metallic gasket or dielectric coating between galvanized…

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Dissimilar metals in contact create galvanic corrosion, especially in wet environments. Use a non-metallic gasket or dielectric coating between galvanized and stainless connections. Check spec requirements.

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Can you verify this before I keep going? I’m looking at: Connecting two different metal types (galvanized to stainless) without dielectric separation. What’s the approved correction for this job?

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Do not hide, force, cover, or “make it work” if this affects safety, access, airflow, rated assemblies, supports, equipment, or inspection. Stop and verify the approved correction.

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