Identify the portion of foam system piping that is not permitted to be galvanized.

Identify the portion of foam system piping that is not permitted to be galvanized.

• A. Foam supply piping
• B. Vent piping
• C. Drain piping
• D. Concentrate piping

Answer: (D)

Foam concentrate piping must be compatible with the concentrate itself. Foam concentrates can attack or corrode zinc, the coating on galvanized steel, causing zinc to leach into the concentrate. This can alter the concentrate’s chemistry, degrade foam quality, and even clog or damage the system. To prevent these issues, concentrate piping is made from materials resistant to the concentrate (such as stainless steel, certain plastics, or epoxy-lined steel). Other parts of the foam system may be galvanized because they don’t handle the concentrate directly, but concentrate piping specifically is not allowed to be galvanized.

Foam concentrate piping must be compatible with the concentrate itself. Foam concentrates can attack or corrode zinc, the coating on galvanized steel, causing zinc to leach into the concentrate. This can alter the concentrate’s chemistry, degrade foam quality, and even clog or damage the system. To prevent these issues, concentrate piping is made from materials resistant to the concentrate (such as stainless steel, certain plastics, or epoxy-lined steel). Other parts of the foam system may be galvanized because they don’t handle the concentrate directly, but concentrate piping specifically is not allowed to be galvanized.