Water at a temperature of 25°C flows through a horizontal cast iron pipe (as shown in the following figure) at 0.0314 m³/s. Determine the smallest diameter pipe (in mm) if the allowed pressure drop over a length, L-223 m is to be no more than 80 kPa. Take pw = 997.1 kg/m³ and w = 0.898(10-6) m²/s, and roughness height = 0.00026 m. Note: 1. Take pressure drop at section 1 and section 2 as, P1-P₂ = whL 2. Take f=0.024 for your first assumption 3. Make only two iterations 4. Answer should be in decimal value with two decimal places L

Water at a temperature of 25°C flows through a horizontal cast iron pipe (as shown in the following figure) at 0.0314 m³/s. Determine the smallest diameter pipe (in mm) if the allowed pressure drop over a length, L-223 m is to be no more than 80 kPa. Take pw = 997.1 kg/m³ and w = 0.898(10-6) m²/s, and roughness height = 0.00026 m. Note: 1. Take pressure drop at section 1 and section 2 as, P1-P₂ = whL 2. Take f=0.024 for your first assumption 3. Make only two iterations 4. Answer should be in decimal value with two decimal places L