Pipes 1,2,3 and 4 have lengths of 300m, 240m, 210m and 450m all being new cast iron. Pipes 2 and 3 are laid in parallel both drawing from 1 and discharging into 4. If 1,2 and 4 have diameters of 200mm, 150mm and 250mm, respectively, determine the diameter of 3 when the discharge through the system is 45 liters/sec under a total head loss of 8m. Assume f=0.02.
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