Oil with a kinematic viscosity v = 0.0002 ft²/sec is to be pumped along a pipeline at 8.0 ft³/sec. To keep the pumping power at a reasonable level, it has been decided that the frictional head loss, expressed as gh,, must be kept below 0.4 ft-lb./lbm per 100 ft. of pipe length. Select the smallest diameter of wrought iron pipe which would be suitable for this application. Assume that pipe is only available in diameters with 0.1 ft. increments (eg. D = 0.4, 0.5, 0.6 ft. etc.) (Ans. 1.6 ft.)