It is desired to deliver 60 m3/h of water ( = 998 kg/m3, = 0.001 kg/ms) at

It is desired to deliver 60 m3/h of water (ρ = 998 kg/m3, μ = 0.001 kg/m⋅s) at 20°C through a horizontal asphalted cast-iron pipe. Estimate the pipe diameter which will cause the pressure drop to be exactly 40 kPa per 100 meters of pipe length.