Bridge Standpipe NFPA 502 Questions

[swoosh172]

I have a question for everyone regarding standpipes on bridges. I would appreciate all opinions and comments as I am new to NFPA 502. The bridge in question is 300 feet above grade at its highest point and over 1.5 miles long. The bridge is in an area prone to very cold winters and freezing. I am proposing an empty standpipe with a fire pump that is manually started by the control room operator. There is cctv so when they see a fire they start the pump. I am also providing FDCs at grade, but i'm not sure the pumper truck can pump that high? Since the pipe can freeze I am thinking what I am proposing is OK. Per NFPA 502 a wet system would require heat tracing, insulating, and recirculation. I would consider this a dry system, and therefore the pump would have to charge the standpipe along the entire length of the bridge in 10 minutes. Should I do a conventional dry system with maintaing air pressure along the 1.5 mile pipe. I would imagine it would be a huge compressor. Are the FDC at grade useless due to the height of the bridge. I'm looking at 300 psi to get to the most remote hose connection, can a pumper do this? Does anyone have experience with high rise bridges in cold climates? If so any help is appreciated. Thanks in advance.

 

[NJ1]

Here in New Jersey all you see is dry standpipes period. No fire pumps, no dry pipe valves. I believe the only bridge equip with a pump is George Washington Bridge but I never seen the pump. All connections are storz connections.