Which statement is correct regarding foam concentrate piping?

Which statement is correct regarding foam concentrate piping?

• A. Piping must be galvanized.
• B. Piping may be galvanized if listed.
• C. Piping must not be galvanized.
• D. Piping must be copper.

Answer: (C)

Foam concentrate piping must use materials that won’t react with or contaminate the concentrate. Galvanized coatings on steel can shed zinc or react with certain foam concentrates, leading to contamination, degraded foam quality, and increased corrosion inside the line. To prevent these issues, foam concentrate piping is required to be not galvanized. In practice, acceptable options are non-galvanized metals or compatible non-metallic materials, chosen to match the system’s foam concentrate and listing. This is why the statement that piping must not be galvanized is correct.

Foam concentrate piping must use materials that won’t react with or contaminate the concentrate. Galvanized coatings on steel can shed zinc or react with certain foam concentrates, leading to contamination, degraded foam quality, and increased corrosion inside the line. To prevent these issues, foam concentrate piping is required to be not galvanized. In practice, acceptable options are non-galvanized metals or compatible non-metallic materials, chosen to match the system’s foam concentrate and listing. This is why the statement that piping must not be galvanized is correct.