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Barrier dry fire stand and sprinkler piping underground

Question asked by f.hanna on Jan 31, 2020

NFPA-13 indicated the following:  Dry Pipe Underground, Where necessary to place pipe that will be under air pressure, underground, the pipe shall be protected against corrosion. Unprotected cast-iron or ductile-iron pipe shall be permitted where the joined a gasket joint listed for air service underground.  

Also the fire piping shall be monitor and accessible .

Would it possible to install large part of sprinkler / fire stand piping underground.?

Can you please verify the possibility and recommended pipe material for these application?