Question 7.P.21: A 300 mm dia pipe carries kerosene at a rate of 200 l/s. The......

using equation (7.11.13). {\frac{1}{\sqrt{f}}}\,=\,2\,\log\,{\frac{R}{ε}}\,+\,1.74\,=\,2\,\log\,{\frac{0.15}{0.2\times10^{-3}}}\,+\,1.74\,=\,7.49 \\ ∴             f=0.01782\;\mathrm{m}          u=4\times0.2/\pi\times0.3^{2}=2.829\ \mathrm{m/s} \\ h_{f}={\frac{0.01782\times1000\times u^{2}}{2\times9.81\times0.3}}+{\frac{u^{2}}{2\times9.81}}=3.0785u^{2}

substituting the value of u, h_{f} = 24.65 m (head of kerosene)