Hi, Till now I have confusion regarding the function of the private fire hydrant which is with two hoses (2 1/2") and 4" pumper outlet, as:
01- it is mentioned in NFPA 24 that is used for delivering water to the fire department truck so the residual pressure will be 20 PSI, but I find a lot of design engineers making the minimum residual pressure for it 100 PSI.
so I have two questions
01- what is the function of the fire hydrant.
02- how to calculate the required flow and pressure for it.