Galvanized pipe shall never be used on wet chemical systems.

Galvanized pipe shall never be used on wet chemical systems.

• A. True
• B. False
• C. It depends on the system
• D. Only for vertical runs

Answer: (A)

The key idea is material compatibility and corrosion resistance in wet chemical fire suppression systems. The wet chemical agent (potassium acetate solution) creates a corrosive, moist environment that attacks zinc. Galvanized pipe has a zinc coating that is not resistant to this chemical exposure, so it corrodes, flakes, and eventually leaks or fails. Because the system relies on reliable piping to deliver the agent, codes and manufacturers specify non-galvanized, corrosion-resistant materials (such as stainless steel or other approved options) for wet chemical systems. This requirement applies regardless of how the piping is oriented or arranged, so galvanized piping should not be used at all.

The key idea is material compatibility and corrosion resistance in wet chemical fire suppression systems. The wet chemical agent (potassium acetate solution) creates a corrosive, moist environment that attacks zinc. Galvanized pipe has a zinc coating that is not resistant to this chemical exposure, so it corrodes, flakes, and eventually leaks or fails. Because the system relies on reliable piping to deliver the agent, codes and manufacturers specify non-galvanized, corrosion-resistant materials (such as stainless steel or other approved options) for wet chemical systems. This requirement applies regardless of how the piping is oriented or arranged, so galvanized piping should not be used at all.