Is galvanized pipe allowed for foam concentrate piping?

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Material compatibility with foam concentrate is the key concept. Galvanized pipe has a zinc coating that can react with and be damaged by many foam concentrates. This corrosion or coating degradation can contaminate the concentrate, reduce foam quality, and lead to blockages or leaks in the concentrate piping.

Because foam systems require piping that is compatible with the concentrate and resistant to its chemistry, the recommended and typical practice is to use materials like black iron (uncoated steel), stainless steel, or other corrosion-resistant options rather than galvanized steel. Some manufacturers or codes also specify approved alternatives, and in rare cases an AHJ might permit a different material if a detailed compatibility assessment supports it. However, the standard stance is that galvanized pipe is not allowed for foam concentrate piping.