2.3 An oil having a viscosity of 0.0098 kgf second per square metre and a specific gravity of 1.59 flows through a horizontal pipe of 5 centimeter diameter with a pressure drop of 0.06 kgf per square centimeter per meter length of the pipe. Determine (i) the rate of flow in kilograms per minute, (ii) the shear stress at the pipe wall, (iii) the total drag for 100-metre length of the pipe and (iv) the power required for the 100 metre length of the pipe to maintain the flow.

A spherical balloon with an outer diameter of 490 mm and thickness 0.3 mm is filled with a gas. Calculate maximum permissible pressure (in kPa) in the balloon if the allowable normal strain at the outer surface of the balloon is 0.1. Assume E = 4 MPa and v = 0.47. (Assume that the given radius or diameter is an inside dimension and that all internal pressures are gage pressures.) kPa

Oil (kinematic viscosity = .0003 ft^2/s and specific weight = 53.7 lb/ft^3) flows from A (zA = 225.5 ft ) to B (zB = 235.84 ft) at a rate of 290 gpm. The pipe material is commerical steel and the pipe length from A to B is 7320 ft. The required minimum pressures at A and B are PA = 55 psi and PB = 13 psi. Determine the minimum pipe size to satisfy the pressure requirements through iteration with the Moddy Diagram. Round up the diameter to the nearest 1 inch.

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