Piping, fittings, and valves shall be of material compatible with which substances used in the system?

Piping, fittings, and valves shall be of material compatible with which substances used in the system?

• A. The foam concentrate, foam solution, or water used
• B. The foam concentrate only
• C. The corrosion-protection coating
• D. The ambient temperature

Answer: (B)

Materials used for piping, fittings, and valves must be compatible with the foam concentrate, because foam concentrates can be chemically aggressive and attack certain metals and elastomer seals. If the base materials aren’t compatible, components can degrade, leading to leaks or system failure when the foam is discharged. Water is present, but it is not the reactive substance driving compatibility concerns in this context, and ambient temperature is a condition, not a chemical. The main requirement is selecting materials that stand up to the foam concentrate throughout service.

Materials used for piping, fittings, and valves must be compatible with the foam concentrate, because foam concentrates can be chemically aggressive and attack certain metals and elastomer seals. If the base materials aren’t compatible, components can degrade, leading to leaks or system failure when the foam is discharged. Water is present, but it is not the reactive substance driving compatibility concerns in this context, and ambient temperature is a condition, not a chemical. The main requirement is selecting materials that stand up to the foam concentrate throughout service.