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[Lorean]

I have to size line system, firewater system. I have several questions. I have default sizing datasheet. 1)-do we add valve, fittings length to the pipe length? Do we add hydrant lenght, pipe branch length to the pipe length? In datasheet i have special fitting sections, so i ll add valves there for pressure drop. But should i add the valves length to the total length?2) - I have excell datasheet, and there i can only calculate every line individually. How can i size whole system?how to interconnect them, please help.