Have a project which has a remote fire department connection outside of the main building. The fire department connection has its own dedicated feed that goes from the remote FDC, underground, up into the building, where it connects to the fire sprinkler riser downstream of the backflow preventer.
The check valve for this line is required to be inside the building, so the main between the FDC and check valve in the building is intended to be dry.
NFPA 24 (if that applies) allows PVC for underground water service in its table of permitted pipe types.
NFPA 13 specifically states that galvanized steel is permitted to be used between the FDC and the check valve serving the FDC. I can't see where NFPA 13 would mandate pipe types for this arrangement.
Is this underground FDC feed allowed to be PVC?
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