In NFPA 11, what type of pipe is required for foam system piping?

In NFPA 11, which addresses the design and installation of foam systems, the requirement for the type of pipe used in foam system piping includes specifications for corrosion resistance, mechanical strength, and compatibility with the foam concentrate. Galvanized pipe is a common choice because it provides adequate corrosion resistance while being robust enough to handle the pressures associated with foam systems.

Using galvanized pipe is particularly advantageous in environments where the pipe may be exposed to moisture or chemicals, as the protective zinc coating helps prevent rust and degradation over time. This is essential for maintaining the integrity of the foam system and ensuring it functions correctly when deployed.

Other types of pipes, such as plastic pipe, steel pipe, or copper pipe, may not meet the criteria set forth in NFPA 11 due to concerns like lower pressure ratings, susceptibility to corrosion, or lack of appropriate chemical compatibility with foam agents. The reliance on galvanized pipe helps ensure that the foam system remains operational and effective in emergency situations, adhering to safety standards and regulatory requirements.