What is the allowed material status for foam concentrate piping?

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Material compatibility with the foam concentrate is the key idea. Foam concentrates can be corrosive to zinc coatings on galvanized steel and to plain carbon steel, which over time can lead to leaks, deposits, or contamination in the piping. To prevent these issues, foam concentrate piping must not be galvanized or carbon steel. That’s why the statement that the piping must not be galvanized or carbon steel is the correct one.