I have a 6,000 foot bridge that is 300 feet above grade. I have been tasked with specifying the dry pipe fire standpipe system on this bridge. An acutal fire engineering firm will do the design build of the system but I want to make sure I am specifying it correctly. Can anyone shed some insight as to what the specs should be for material, flanges, expansion joints etc? I am thinking galvanized steel, but is ductile iron used ever, I can only seem to find restrained mechanical joints with ductile iron pipe? It looks like most standpipes have restrained joints with expansion joints in the system and the pipe is supported on roller hangers. I'm probably looking at 600 psi flanges correct due to the height, length and movement of the bridge? Any help is appreciated! Thanks.
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