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Underground and above ground Piping requirements

Question asked by jparker2013 on Jun 7, 2018
Latest reply on Jun 7, 2018 by milt.werner

I understand that NFPA 24 does not include ASTM 53 steel pipe to be used underground for firewater main piping for a private fire protection service (Table but does allow via referenced to NFPA 13 for above ground piping (Table to be of ASTM 53. What is the reasoning behind not allowing ASTM 53 steel pipe, even cathodically protected, as the allowed pipe in an underground fire water main?