Refer Moody’s chart wherever required for friction factor.

1. What is the skin frictional loss when water is flowing at 1.65 m/s through a horizontal 33m long pipe having inside diameter of 2.067inches and absolute roughness 0.0018 inch.
   Use the following data:
   
   • Density of water = 995 kg/m³,
   • viscosity of water = 0.85cP
     

   Assume that inlet and exit points are at the same elevation and entrance and exit losses are negligible.

2. Water with a coefficient of dynamic viscosity of 1.4 x 10 -3 NS/m² flows along a pipe 50mm diameter. If the pipe has an absolute roughness of 0.0000 7m,
   calculate:
   a. The head lost due to friction per km of pipe
   b. The power required to overcome friction per km of pipe
   (i) For a flow rate of 3 litres/min
   (ii) For a flow rate of 40 litres/min


3. Pressure drop in a water pipeline with turbulent flow is 25 psi for ordinary steel pipe. What would the pressure drop be if copper pipe were used? Hint: use coefficient of roughness