Water at 25°C is flowing throug a 1.0 km long G.I. pipe

Water at 25°C is flowing throug a 1.0 km long G.I. pipe of 200 mm diameter at the rate of 0.07 m³/s. If value of Darcy friction factor for this pipe is 0.02 and density of water is 1000 kg/m³, the pumping power (in kW) required to maintain the flow is

v =	0.07	= 2.23 m/s
	π/4(0.2)²

Head loss, h_f =	4fLv²	= 2.23 m/s
	d × 2g

=	4 × 0.02 × 1000 × (2.23)²	= 25.35
	0.2 × 2 × 9.81

∴Power = ρghf
= 9.81 × 0.07 × 25.35 = 17.4 kW