I was reviewing section 4 of the 2016 version of NFPA 11. Carbon Steel is now listed as a non-compliant material for foam chamber pipes and fittings. Can anybody provide me with the reason carbon steel is now a non-compliant material?
3) The system piping section has been reorganized to clearly indicate separate requirements for foam concentrate and foam solution. The options for foam solution piping materials have been expanded to permit non-galvanized pipe, while ensuring compatibility of the pipe material with the foam solution.
Appendix says some of the foam is corrosive, plus the pipe can rust
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