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NFPA 11 Carbon Steel Pipe

Question asked by jkean on Jul 10, 2018
Latest reply on Jul 10, 2018 by cdafd

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?